CATALOG UE
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MICROMETRICAL MEASUREMENTS
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HY THE
REW. W. R. DAWES, F.R.S. F.R.A.S.
(Forning Part of Vol. XXXV. of the Memoirs of the Royal Astronomical Society.)
1867.
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MICROMETRICAL MEASUREMENTS
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DOUBLE STARS.
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REW. W. R. DAWES, F.R.S., F.R.A.S.
(Forming Part of Vol. XXXV. of the Memoirs of the Royal Astronomical Society.)
1867.
I37
IV. Catalogue of Micrometrical Measurements of Double Stars.
By the Rev. W. R. DAWEs.
Read April 12, 1867.
—º-
Introduction.
THE series of Micrometrical Measurements of Double Stars, which I have
now the honour of presenting to the Royal Astronomical Society, contains
all the measures obtained between the close of my second series (published
in the Memoirs R.A.S. vol. xix) and the present time. The former and
principal part of the series contains the observations made to the end of the
year 1854 ; to which is added an Appendix, containing such as have been
subsequently effected. The Catalogue itself is preceded by a description
of the different micrometers employed.
In the computation of all the Mean Results, the weights attached to the
individual measures when made have been introduced,—the sum of the
weights of each set representing its aggregate value on the plan adopted
in my two previous series of assigning io to a measure judged to be as
perfect as possible. The sum of the weights attached to a single night's
measures of any object is always below Ioo ; and in computing the mean
of several nights’ measures, the labour of the necessary multiplications and
divisions has been greatly alleviated by the use of “CRELLE's Rechen-
tafeln ; ”—a work which is in fact an extension of the multiplication
table to 999 × 999.
To the first and principal portion of the Catalogue, and also to the
Appendix, are attached Notes on each star which I have measured ; in
which are collected for comparison the results obtained by other observers.
ROYAL ASTRON. Soc. Vol. XXXV. T
138 Rev. W. R. DAWEs, Catalogue of
In most cases these comprise all with which I was acquainted ; while in
others, principally those of least interest, a liberal selection has been deemed
sufficient. In this part of the work I have profited greatly by the kindness
of the late Professor STRUVE and Professor MÁDLER of Dorpat in forwarding
to me many of the volumes of the Dorpat Observations; and also of
Professor SECCHI in sending me the volumes of Memoirs of the Observatory
of the Collegio Romano, containing his observations of double stars. Mr.
OTTO STRUVE also, to whom I had communicated my measures of several
of the stars discovered by him at Pulkowa, sent me in return the results of
his own observations of them for comparison with mine. These are
introduced in the comparative series, and are in fact in several instances
the only observations with which mine could be compared. Some very
valuable results which have been communicated to the Astron. Wachºr. by
Professor KAISER of Leiden, and by the Baron DEMBOWSKI, have also been
introduced.
The Repeating or Parallel-Wire Micrometer, employed at Mr. BISHOP’s
Observatory, South Villa, Regent's Park, London.
The arrangement of the wires in this micrometer, constructed by Mr.
DOLLOND, was assimilated to that of the micrometer which I had used at
Ormskirk;-two parallel metallic wires being inserted at right angles to
the moveable webs, and their interior edges being about 12" apart. Between
these the double stars were placed for the measurement of the angle of
position, the micrometer being turned in position till the direction of the
wires was judged to be parallel to an imaginary line joining the centres of
the stars. The advantage of using the thicker wires instead of the fine
spider-lines for the measurement of position is very considerable in reference
to the firmness of the judgment formed by the eye ; and from the very
feeble illumination requisite for their visibility, stars can be observed in
position fully one magnitude below the limit which would be imposed by
the use of sufficient illumination of the field to render the spider's webs
distinctly visible.
Besides these fixed wires, two others were inserted parallel to the fine
webs, and moving with them. These, however, though useful for cometary
Micrometrical Measurements of Double Stars. I39
observations, were never employed for measurements of the distance of
double stars.
The position circle of this micrometer is read off by its two opposite
verniers to a single minute. The value of one revolution of the screw was
found to be 15"955. The thickness of each of the fixed and moveable wires
was 3"'54 in arc ; and of the spider-lines o'73.
A concave achromatic lens made by DOLLOND (as suggested by Professor
BARLow, and therefore most appropriately called “The BARLow-lens,”) was
occasionally inserted between the object-glass and its focus in the manner
mentioned in the Introduction to the first series of my observations of
double stars made at Ormskirk (Memoirs R.A.S. vol. viii); and more
particularly explained in the Introduction to the second series. (Memoirs
R.A.S. vol. xix.) It nearly doubled the magnifying power of the object-
glass; and the value of one revolution of the micrometer screw was thereby
reduced to 8"243.
In measuring distances, one of the webs was always fixed by a bolt
which effectually prevents any accidental change in its place ; and the
measures were made by means of the moveable web on each side of the
fixed one, the zero correction being thus eliminated. This plan I have
always employed in observing with the parallel-wire micrometer.
A very important aid to the convenient and accurate use of this
micrometer is the piece of mechanism termed a slipping-piece. This, being
applied to the tail-piece of the telescope, receives the micrometer into a stout
plate of brass which is moveable in right ascension and declination by fine
screws. A double star can thus be brought precisely into the middle
between the position wires; and either of the webs can be placed upon
either of its component stars with ease and certainty.
The magnifying powers produced by the double eye-pieces belonging
to this micrometer were about 63, IoS, 185, 320, 420, and 6oo. Two more,
magnifying 190 and 300, were added to the original series for the sake of
avoiding the inconvenience of changing the adapter during observation.
With the addition of the BARLow-lens, the powers were about 122, 203, 360,
368, 580, 620, 810, and 1160. Of these, 360 and 62o were alone employed.
A double convex crossed lens, giving a power of 520, was used on a few
occasions.
I4.O Rev. W. R. DAWEs, Catalogue of
Description of the Prismatic Crystal Micrometer employed at the South
Villa Observatory.
As there seems to be some personal peculiarity attaching to most
observers with the repeating or parallel-wire micrometer, it appeared to be
very desirable to compare the results, in distance especially, obtained by
means of that instrument with those which might be procured of the same
objects with a double-image micrometer. Having in the year 1842 conferred
with Mr. BISHOP on this subject, I was requested by him to order from Mr.
DOLLOND such an instrument as I considered most suitable to the purpose.
I had no hesitation in giving the preference to some application of the
double-refracting crystal, as it is of prime importance that in the measure-
ment of the position of double stars the images should be as good as
possible. The scale of the spherical crystal micrometer being far from
uniform, and also of very small extent, though as made by Mr. DOLLOND it
gives beautiful images, it was resolved to adopt a modification of ROCHON's
plan of producing a double image by causing a double prism of rock crystal
to slide along the inside of the tube. Mr. DOLLOND had previously
constructed such with the substitution of a sphere of the same substance
for the usual magnifier or eye-lens; which, by its rotation on an axis at
right angles to the plane of double refraction, was used to complete an
approximate measure made by means of the sliding prisms. The want of
uniformity of the scale of the sphere introducing some uncertainty in the
result, I preferred the use of single crossed convex lenses as magnifiers;
and had three such applied, whose powers on the South Villa refractor were,
185, 350, and 520. By adjusting the length of the adapting tube of each
lens to its focal length, the lens is brought as near as can be allowed to a
fixed plate, which carries two fine spider-lines at right angles to each other
and crossing in the centre of the field. These lines being as close as
possible to the surface of the eye-lens when pushed home are quite invisible,
and do not sensibly disturb the image. One of them is placed precisely in
the direction of the separation of the images, so as to bisect both the images
of a single star when widely separated ; the eye-lens being drawn out till
the line is in focus. Then, by turning the position-circle till a star runs
along this line, the Zero of position is given by the reading of the index,
Micrometrical Measurements of Double Stars. I4 I
which will be 90° when there is no index error. The angle of position
(which is read off by the two opposite verniers to one minute) was
obtained by bringing the four components of the two images into a straight
line alternately on both sides of the point of single vision ; and the mean
of the reading was adopted. With the first set of prisms the secondary
image did not pass the fixed image quite centrally ; but the difference of
the observed angle on each side was not such as to render necessary a
correction of the double distance measured by placing the four stars at
equal distances. By the mean result of a great number of careful obser-
vations on artificial stars, the nearest approach of the centres (a) was
found to be o' 1559. Where, however, in consequence of the distance being
too great to allow of the measures being made on both sides of the point
of single vision, or from any other cause, the observations were confined
to one side, a correction to the angle was calculated by the formula, tan. of
angular correction = o” 1559 × 2 d: – 2d being the double distance measured
by the micrometer. In all such cases the fact is mentioned in the notes
that a zero of distance has been employed, and a calculated correction
applied to the measured angle. The zero-point has in these instances been
deduced from measures on both sides of zero, taken with the same eye-lens
either on the same night, or very near the time of observation. From the
construction of the instrument, the zero reading is very different with each
of the eye-lenses; but the fluctuations of that reading were very small,
far less in fact than the probable errors of observation.
From some subsequent observations on artificial stars, it appeared as if
the nearest approach of the centres were not precisely the same with the
different eye-pieces ; but as the variations were very small, and the amount
not very certain, the value of a above given was adhered to, being
extremely near the mean of all the results with power 350, which was the
one most frequently employed. The value of one division of the scale with
these prisms was o' 5742, determined by the interval of time between the
transits of the two images of a juxta-polar single star over the web placed
perpendicular to the direction of motion.
A new set of prisms inserted by Mr. DoILOND was used after 1843, Aug.
16, with which the passing of the images was so nearly central that no
correction to the angle was required. The value of one division of the scale
with the new prisms was determined to be o”28986.
* Rev. W. R. DAWEs, Catalogue of
It is essential to accuracy that the object should be pretty near the
middle of the field of view. When the driving clock goes well, there is no
difficulty in keeping it there ; but as the field was usually dark when this
micrometer was employed, a little illumination was occasionally admitted
to render the margin of the field visible ; or the eye-lens was withdrawn
till the cross webs became visible on the enlarged image of the object,
which generally had sufficient light to render illumination of the field
unnecessary for the purpose.
On the whole, I formed the opinion that the angles of position measured
with this micrometer (by placing the four stars in a line) are not quite
worthy of the same confidence as those procured by placing the image
between the thick parallel wires of the repeating micrometer ; notwith-
standing that the double image is as perfect, or very nearly so, as the
single image with an ordinary eye-piece. The distances, on the contrary,
I believe to be as accurately measured as the observer's eye was capable
of under the atmospheric circumstances. And very tolerable measures
of distance may be obtained by the estimation of equal intervals between
the components, even when the stars are so violently and rapidly agitated
that the webs could not be kept on their disks for an instant, and the
observer's eye would soon be distressed and wearied by continued and
ineffectual attempts. Moreover, a less perfect action of the driving clock
is needed with a double-image micrometer than with the parallel-wire
micrometer.
This micrometer is referred to by the abbreviation, Pr. Cr. M.
Description of MERz's Parallel-wire Micrometer.
The parallel-wire micrometer which accompanied the equatoreal made
for me by MERz and SON, of Munich, in the year 1846, differed considerably
from those usually constructed in this country. Only one of the micrometer
screws has a graduated head, the other carries the thread on either side of
which the measures of distance are made ; but it is not furnished with the
means of bolting or otherwise fixing the thread at any given point. The
only threads in the field are the two parallel spider-lines, with which the
measures both of position and distance are taken. The number of whole
Micrometrical Measurements of Double Stars. I43
revolutions of the screw are conveniently read off on the outside o. the
micrometer frame ;-an arrangement which does not, like the interior
comb, require illumination of the field and the application of a low power
to render the scale visible, and which might therefore be advantageously
copied by instrument-makers in this country. This micrometer was
furnished with the means of illuminating the threads in a dark field ; but
I soon found that though useful for approvimate measurements of objects
too faint to bear illumination of the field, they could not be depended on for
accurate determinations of distance ; and no observations thus made are
included among the measures in the following catalogue.
The value of one revolution of the screw was found to be 25".606. This
micrometer was furnished with seven double eye-pieces, whose magnifying
powers on the 84-foot object-glass, of 64-in. clear aperture, were 120, 155,
260, 322, 435, 572, and 690. These powers, as well as all others quoted in
this catalogue, were determined by careful measurement of the emergent
pencils. The real powers are therefore not smaller than the quotations.
This is to be taken into consideration in comparing the powers used in my
observations with those employed by Professor STRUVE at Dorpat, in whose
great work (Mensuraº Micrometrica) the powers are quoted as stated by
the maker, though the actual powers were found by STRUVE himself to be
much less, as appears from the following table given in the Introduction
to that work :
Eye-pieces of the Parallel-wire Micrometer of the Dorpat Refractor.
No ºn tº
I 94.
2 I 4o I 33
3 2 I 4 198
4. 320, 254
5 48o 42O
6 6oo 532
7 8oo 682
8 I OOO 848
9 I 5oo II 50
I O 2OOO 15oo
The spider-lines inserted by MERZ were beautifully round and uniform
in thickness; but they were inconveniently thick for measurement in
* Rev. W. R. DAWEs, Catalogue of
distance of very close stars, and totally occulted very small ones. Wishing
to try the effect of the BARLow concave achromatic lens in diminishing the
arc subtended by the threads, I requested of Sir JoHN HERSCHEL the loan
of one which had been made by Mr. DoILOND for him before his departure
for the Cape of Good Hope ; and finding that it perfectly answered my
purpose, he kindly presented it to me in December 1846. From that time
this lens has been frequently used : the magnifying powers of the four
lowest eye-pieces of the micrometer were increased to about 300, 387, 648,
and 803 ; and the value of one revolution of the micrometer screw was
10"-268. The defining power of the object-glass was not sensibly impaired
by the intervention of this lens.
This micrometer continued in use till 1848, Feb. 25, when I exchanged
it with Mr. LASSELL for a parallel-wire micrometer made for him in 1839 by
Mr. DoILOND under my direction, in which the system of thick wires
and webs was similar to that which had been inserted into Mr. BISHOP's
micrometer, as stated above.
The eight eye-pieces of DOLLOND’s micrometer produced the following
powers on the 84-foot refractor, 87, 136, 200, 268, 353, 467, 591, and 780.
With the BARLow-lens interposed, the powers of the six lowest became 163,
252, 375, 500, 658, and 870 ; the tube of the BARLOW-lens having been
somewhat shortened, and its effect therefore rather diminished. One
revolution of the screw was equal to 19°9935 on the Munich refractor,
which on the application of the lens was reduced to 10^680.
It may be well to mention here that I have found it very convenient to
have the tube of the BARLow-lens divided into several pieces, any of which
can be used, and thus any degree of relative fineness of the webs secured.
The value of the micrometer screw will of course require to be ascertained
for each length of the tube.
Description of the Spherical Crystal Micrometer.
Two of these instruments have been occasionally employed since the
erection of my Munich equatoreal at Cranbrook in the autumn of 1846.
Both of them were made by DOLLOND, who first contrived this form of
double-image micrometer. One had belonged to Mr. F. BAILY ; and after
Micrometrical Measurements of Double Stars. I4.5
his death it was purchased at the sale of his library and instruments by Mr.
R. HoDGSON, who obliged me with the use of it to the close of this series
of double-star measures. It has a small position circle, but is not furnished
with any means of determining the zero of position. To obviate this
defect, I fixed temporarily a fine wire upon a diaphragm in the focus
of the sphere. The zero of position was then determined by letting a star
travel along this wire ; and the angles were measured by placing the
wire alternately on each side of the single image of a double star, and
thus judging of the parallelism of the wire to the imaginary line joining
the centres of the two stars. I believe this method to be considerably
more accurate than placing the stars of the two images in a line ; and
even than attempting to bisect both the stars of one image by a fine web ;
yet as the result is inferior in precision to that obtained by placing the
double star between two parallel wires, I have allowed to such observations
only half the weight which would have been assigned to them if taken
by the latter method. *
The measurement of distance with this micrometer is effected by the
rotation of the sphere upon an axis perpendicular to the plane of double
refraction. The same axis carries an index which shows on a circular
arc the number of degrees through which the sphere has rotated on either
side of the zero point of the scale in the middle of the arc. The greatest
separation of the images occurs at 45° from the zero point. -
Though the greatest distance measurable with such a micrometer is
only about 13" or 14” when the magnifying power is Ioo ; and varying
inversely as the power, becomes very small when the micrometer is
attached to a telescope of long focus ; yet from the excellent images
it gives when worked as perfectly as those I have employed, (all made
by DOLLOND,) it must long ago have been considered a very useful
instrument for the measurement of very small angles if the degrees of the
arc, over which the index passes as the sphere is rotated, were of equal
value; or, in other words, if the value of the scale were uniform throughout
the arc. But this is very far from being the case, as immediately appears
from experiments; and this reason is given by Dr. PEARSON in his
Practical Astronomy for laying it aside as useless.
Being unacquainted with any experiments from which the law of
variation could be deduced, I determined to institute such a series as
Roy AL ASTRON. Soc. WOL. XXXV. U
146 Rev. W. R. DAWEs, Catalogue of
would give with great accuracy the values at several points of the scale.
For this purpose I applied a parallel-wire micrometer to a telescope on
which the value of one revolution of its screw had been well ascertained ;
and employed the telescope so furnished by way of collimator to another
telescope to which was applied the spherical crystal micrometer ; the
focal length of each object-glass having been very accurately determined.
The moveable webs of the parallel-wire micrometer being thus rendered
perfectly distinct to an observer with the spherical micrometer, they were
set to a succession of equal intervals, which were most carefully measured
by daylight with the spherical micrometer on each side of its zero point.
These measures expressed in parts of the index arc (a circular scale)
being laid down as abscissae, and seconds and fractions of a second as
ordinates, on a sheet of small squares, a curve was drawn through the
points indicated, and the readings tabulated to each degree of the scale.
Any considerable and irregular variations in the differences of consecutive
values, arising from the combined effect of errors of observation, of drawing
the curve, of reading it off, and of imperfections in the form of the squares
themselves, were subsequently smoothed down. This plan having been
carried into effect with both the spherical micrometers, it became obvious
that the law of variation was the same in both ; and after a little consi-
deration I found that the value of the angles indicated by the index
varied very nearly, if not precisely, as the sine of twice the angle through
which the sphere rotated, commencing from the zero point. On a focal
length of 102.5 inches, the largest arc measurable with one of these
micrometers (designated as No. 1) is 2"'85, –the index then pointing
to 45° on the circular scale : and with the other micrometer (No. 2)
the largest arc on the same focal length is 7"70. From these values
tables were calculated of the value corresponding to each division of
the scale. In only 9 out of the 45 values in No. 1 did the difference
between the value deduced from the observations and the value given
by calculation amount to o' or ; and of these 9, four are + and five are — .
The results of the calculation therefore appear to represent the true values
quite as correctly as they could be deduced from any series of observations.
Putting r = the value of the separation of the images on any given
focal length when the sphere is turned through 45° from
the Zero point,
Micrometrical Measurements of Double Stars. 147
the value 2 of any other angle 4 indicated by the index will be given by the
formula, - w
g = r. sin 20
The value of r will of course vary inversely as the focal length of the
telescope to which the micrometer is applied.
This micrometer is referred to by the abbreviation, Sph. Cr. M.
Description of AMICI's Double-image Micrometer.
This micrometer was constructed by the late Professor AMICI of Modena
for Sir JoHN HERSCHEL ; but it was furnished with only one eye-piece,
which was of an inconveniently high power,-magnifying nearly 1000
times on the 20-foot reflector, for which I presume the Professor designed
it, as the position-circle is graduated suitably for a front-view reflector.
It was, I believe, but little if at all used by Sir JoHN in his observations
at the Cape. As I was desirous of trying such a micrometer on my
refractor, Sir JoHN lent it me for that purpose, and I found it very efficient
on many objects. In reply to a favourable report of its performance,
Sir JoHN most kindly made me a present of it as a new year's gift on
the first of January, 1855. I soon after had some important additions
made to it by DOLLOND, by which its usefulness was greatly increased.
The principal of these was a sliding tube, which could be accurately fixed
at four different lengths, at each of which the divisions on the scale
have a different value ; – thus extending the use of the micrometer for
wider stars, and giving a finer scale for very close stars, than was
possible with the original tube of a fixed and unalterable length. Three
new double eye-pieces were also applied, which on Ioo inches of focal
length produce powers of about 212, 360, and 508;-the original eye-piece
giving a power of 380. On a diaphragm I had two very stout and beauti-
fully round spider-lines fixed parallel to each other, and at about 10"
apart, for the measurement of angles of position. - -
When the whole aperture of the object-glass is used, the divided glass
of the micrometer makes a spectrum of each star ; and in this form it
is of course almost impossible that good measures of position should
I48 Rev. W. R. DAWES, Catalogue of
be obtained. When however the stars are not extremely close, (the central
distance not less than 1%" when an 8-inch object-glass is in use,) the
disks may be made beautifully round by employing a double circular or
figure-of-eight aperture, or an elliptic aperture :—as I have shown in my
paper on the use of this micrometer inserted in the Monthly Notices,
vol. xviii. No. 3.
Another plan which I contrived soon after this instrument came into
my possession, and which I would take this opportunity of specially
recommending to the attention of astrometers, is this. Instead of the
tube containing the eye-pieces, I had my parallel-wire micrometer adapted
to the AMICI micrometer. The thick parallel wires in the former are
easily brought to coincide with the direction of separation of the images
in the latter ; and thus the single image when nicely central and well
defined may be measured in position by those thick wires ; or, when
the double-circular or elliptic aperture is employed, and the stars in each
of the images are therefore round and neat, one of those images may be
measured in position by placing it between the thick parallel wires.
But there is this peculiar advantage in this kind of double-image micrometer
for the measurement of double stars, that by moving the object but a
small distance from the middle of the field all the rays may be made to
pass through one of the halves of the divided glass ; and thus the
advantage of the whole aperture will be secured both in its illuminating
power on very faint objects, and in its separating power on very close ones.
Another mode of measuring the angle of position which I have
occasionally practised when the double-circular or the elliptic aperture
has been in use, is, I think, worthy of adoption in some cases, especially
where it may be desirable to test and compare the results of different
methods on the same object at the same time. In this method, the thick
wires are placed at right angles to the direction of sepa-
ration ; and the two images being separated by a few seconds
| * , $ only, one of the images is placed on each side of one of the
thick wires. The images may be separated to various
distances, and the effects compared together.
For the measurement of distances also, there is considerable advantage
to be derived from this combination of the double-image and parallel-wire
micrometers. The thick position-wires being placed parallel to the direction
Micrometrical Measurements of Double Stars. I49
of separation, the fine webs should be placed as exactly as possible on the
centres of the components of one of the images; and then, by delicately
moving the objects in the field, the three intervals, formed by placing
the four stars in the two images at equal distances, are brought to the
webs in succession: and thus their equality is tested to the greatest
exactness of which the eye is capable. This may be illustrated by a
diagram. Such a mode of using the webs, it will be understood, is intended
} | . . . . . . . . . .
merely to assist the judgment of the eye in making the interval between
the two images exactly equal to the distance between the components.
And this method may be employed when the whole aperture of the
object-glass is in use ; for the prismatic images of the stars being elongated
in the direction of the webs, the distance may be correctly measured,
though the position cannot.
Another and by no means an inconsiderable advantage of thus com-
bining the two micrometers is this ;-that the measures of distance are
performed with both micrometers at the same time, and therefore under
precisely the same condition of the atmosphere, of the instruments, and of
the observer himself : —the last being sometimes by no means the least
in importance.
It is obvious that the BARLOW-lens may be used with this micrometer,
or combination of micrometers ; so as to bring the value of the scale to
what may be deemed most convenient.
Description of the Four-glass Double-image Micrometer.
In the early part of 1860 I received from Mr. SIMMs a 4-glass double-
image micrometer, with all the latest improvements contrived or approved
of by the Astronomer Royal. It was furnished with four first-lenses of
different focal lengths, by the change of which the magnifying power is
varied. The powers as first arranged were such as on a focal length
of Ioo inches would be about 150, 258, 430, and 540. Finding that the
I 50 Rev. W. R. DAWEs, Catalogue of
highest was more than would be needed for such a micrometer, except
on very rare occasions, I had it changed for a power of about 80 on 100
inches of focal length, which for wide stars is often convenient.
In the focus of the positive eye-piece formed by the two glasses nearest
the eye, I had two parallel thick webs inserted for the measurement of
position-angles; and they can be easily placed either parallel or perpen-
dicular to the direction of separation of the images. A prism is adapted
to the eye-piece to enable the observer to place the double star in any
apparent position he may desire. t -
In a paper which I had the honour of presenting to the Society in
Jan. 1858, “On the Measurement of Position-angles with a Divided-glass
Double-innage Micrometer,” I noticed the possibility of producing round
images by introducing a diaphragm before the divided glass of the micro-
meter ;-such diaphragm having “two circular apertures touching each
other in a point coinciding with the line of collimation of the telescope,
and the diameter of each aperture exactly equal to the semi-diameter of
the cone of rays at the distance of the diaphragm from the focal point
of the object-glass.” And with reference to its practical application I
remarked that, though it would have the advantage of turning with the
position-circle, and thus obviating the necessity of altering the position
of the double-circular aperture (when such a one was placed before the
object-glass) for each double star observed ; yet that there would be
great difficulty in exactly proportioning the size of the apertures in the
diaphragms to the powers employed ; and also in illuminating the field
sufficiently to enable the position-wires to be pleasantly seen. In making
the micrometer for me, Mr. SIMMs acted upon this suggestion, and intro-
duced one such diaphragm for each power of the micrometer. But though
the utmost care has evidently been taken to proportion the excessively
minute apertures correctly, I found that the apertures, for the highest
power (593 on my 84-inch object-glass) were not only too large for that
power, but even for the next lower (472): proving that the difficulties
I anticipated were practically almost insurmountable.
It may be well however to mention here, as it was inadvertently omitted
in the description of the Amician micrometer, that in that form I have
frequently used a diaphragm placed nearly in contact with the divided
glass, and pierced with two minute holes as above described. But though
Micrometrical Measurements of Double Stars. I 5 I
this form of micrometer is more favourable to the application of such
a diaphragm than is the 4-glass micrometer, inasmuch as one pair of holes
is sufficient for all the different powers, yet I must confess to my decided
preference for the double-circular or elliptic aperture placed before the
object-glass ; especially when the parallel wires are used for measuring
the position, and illumination of the field is therefore necessary.
To render more easy and certain the turning of such an aperture to
the proper position, I had the brass dew-cap of my telescope divided to
every 5° by bold strokes on the outside of the distant end ; the zero, or o°,
being coincident with the middle of the declination axis, and consequently
90° from the zero point of the position-circle of the micrometer when
properly adjusted. The observer then has nothing to do but to take an
approximate measure of the position of the double star he is about to
observe, (if the approximate angle is not previously known,) and to set
the line which passes through the centres of the two circular apertures,
or the major axis of the elliptic aperture, to the same angle engraved upon
the dew-cap. - - -
By a small addition to the instrument as usually made, the 4-glass
double-image micrometer may be converted into an Amician. This I
contrived by having a tube made to apply in the place of the usual
eye-tube, and furnished with an adapting screw, into which all the eye-
pieces of the wire micrometer might be fitted. It must, however, be
acknowledged that the 4-glass micrometer converted into an Amician does
not make so good an instrument as the originally constructed Amician,—
the divided glass being too deep a concave.
One great advantage of the Amician form is, that any desired change
of magnifying power can be made during the time of observation by merely
changing the eye-piece, and consequently without any risk of disturbing
the zero adjustment of the position-wires ; which can scarcely be done
where, as in the 4-glass micrometer, the optical portion has to be removed
to change the first glass. Moreover, in the Amician the change of power
does not alter the value of the scale, as it does in the other.
Another very useful purpose to which the 4-glass micrometer may be
applied is, as a double-image dynamometer. But on this subject I hope to
submit to the Society a few remarks in another communication.
I 52 - Rev. W. R. DAWEs, Catalogue of
I may here advert to one or two points which the experience of more
than five and thirty years has convinced me are of some importance in the
measurement of double stars both in position and distance. And first
in position. .
1. The thick position-wires having been turned, as nearly as can be
estimated, into the same direction as the imaginary line joining the unequal
components of a double star placed midway between them, the stars should
be brought nearly to touch one of the wires alternately on each side of it ;
by which a tendency to place one of the double wires nearly in the direction
of a tangent to the disks of moderately unequal stars, may not unfrequently
be detected. When such stars are between the wires, the eye may uncon-
sciously be directed to the edge of one wire rather than of the other ;
but the placing of the star alternately on either side of the same wire will
immediately remove this tendency.
2. The wires having been brought up approximately to the right
direction, attempts will usually be made to improve the measure by
repeated small movements of the wires in the same direction, —the eye
being kept intently fixed upon the stars. Very soon after I commenced my
double-star observations, I became conscious of a tendency in the eye to
accommodate its judgment to the position of the wires before they had been
quite brought up to the right point. And thus, if the wires were alternately
brought up from opposite sides of the true direction, the resulting measures
would be alternately too large and too small. I was much interested some
time ago in some remarks on this subject by that excellent and indefatigable
double-star observer, the Baron DEMBOWSKI, who had detected the same
tendency in himself. To remove the error arising from it he adopted the
plan of bringing up the wires alternately from each side of the true
direction, and taking the same number of measures each way. This is
exactly the same plan as I adopted for some years; and I still continue
always to derange the measures, as soon as read off, alternately in opposite
directions. But I have now for many years practised a mode of observing
which yields a far more uniform series of results. When the eye is not
quite Satisfied with the position of the wires, and a succession of small
alterations is required in the same direction, I always remove my eye from
the telescope for a few moments after each alteration ; and thus endeavour
to get rid of the previous impression, and to bring up my eye fresh to its
Micrometrical Measurements of Double Stars. I 53
work. I find that a more independent and correct judgment is thus formed;
and the individual measures are usually much more accordant, and always
free from any systematic differences. - -
3. In the measurement of the distance, of rather close double stars
especially, I have found it very useful to previously place on each of the
stars, as centrally as possible, a single web of the parallel-wire micrometer;
and carefully to note the change which is thus made in the form of its disk.
The effect on a star of moderate size is to swell out the disk on each side of
the web ; so that if the part of it covered by the web were supplied, the
figure instead of being round would be nearly elliptical. The consequence
of this is, that in a double star just neatly separated with the aperture and
power in use, the swelling out of the disks obliterates the interval between
them, and renders it very difficult to judge of the bisection of the disks.
If however the form of each disk when bisected by the web has been
accurately noted, a trustworthy measure of the distance may be obtained by
placing the webs so as to produce on each the same effect as was previously
observed. But if this effect is not known or is disregarded, the measure will
almost inevitably be considerably too large; the webs being placed too near
the outer edge of each disk.
I cannot but think that some such cause as this must have produced the
enormous excess of the measured distance in many objects in the early
observations of some excellent observers, as may be seen in the series of
results brought together for comparison in the Notes appended to the
following Catalogue. For my own part, I am conscious that until I
detected this source of error, it was one of the causes which produced the
same effect on my earlier measures of distance. But the principal cause of
their excess was, that I then imagined the only measures I was acquainted
with, contained in the Phil. Trans. for 1824 and 1826, were standard results
to which my own ought to approximate ; and consequently I tried to
accustom my eye to the largest measures it could endure. This delusion
was in part dissipated by finding that, in the case of such a star as & Aquarii,
(whose position-angle was not far from oº,) when its distance was deduced
from excellent observations of the difference of declination, obtained by
letting the stars pass through the field threaded on the micrometer-webs
placed on each side of zero, that distance was actually less by more than 1"
than those contained in the comparative series under date 1822 and 1828.
ROYAL ASTRON. SOC. WOL. XXXV. X
I 54. - Rev. W. R. DAWEs, Catalogue of
I refer to this fact especially to guard against the conclusion that, because
more recent observations show in many cases a large diminution of distance,
a real approximation of the components must therefore have actually
occurred. . -
Remarks on the Use of various Telescopic Apertures.
1. Sir JoHN HERSCHEL has recommended the use of a round disk
placed centrally before the object-glass, having a diameter from a sixth to a
fifth of that of the object-glass. In the Introduction to my first series of
double-star measurements, (see Mem. R.A.S. vol. viii., p. 63,) I have
referred to the effect of this application as increasing the separating power
of the telescope, but at the same time increasing both the number and the
brightness of the rings round the brighter stars. They are also thrown
further from the disks; the small companions of rather bright stars are
often hidden by them ; and the disks of nearly equal stars are apt to be
elongated by the rings passing through them. I have therefore seldom
used this expedient, though in some instances it is undoubtedly advan-
tageous. -
2. I have frequently found great advantage from the use of a perforated
whole aperture. The perforated card-board used for making the Berlin
wool-work is very suitable for bright stars, such as Castor, y Leonis,
y Virginis, or even & Bootis. At some distance from the star are arranged
highly coloured prismatic spectra of great beauty. The effect of this
aperture on Venus is exquisitely fine, producing a central image of the
planet perfectly colourless, and very sharply defined. The area of the
exposed surface of the 84-inch object-glass scarcely exceeds that of a 2-inch
object-glass. But when the object is not sufficiently bright to bear so great
a loss of light, a smaller degree of the same effect may be produced by a
disk of card-board, of which a circular portion of the size of the object-glass
is pieced with holes of equal size arranged in concentric circles. The one
Micrometrical Measurements of Double Stars. I55
I have principally employed with an 84-inch object-glass, has 15 circles
containing with a central one 770 holes. They are all o'2 inch in diameter ;
so that the exposed surface of the object-glass is about equal to that of an
object-glass of 5% inches. The effect of this is very agreeable. The disks
are considerably smaller than with the whole aperture, in consequence of
having less than half the brilliancy; the ratio of the area being nearly
as o'45 to 1 ; while the effect of the whole aperture in reducing the
diameter of the disk is also preserved. The brightness of the rings is also
proportionably diminished, and except on very bright stars is scarcely
perceivable. Around these there are concentric prismatic rings, but at
such a distance as not usually to interfere with companion stars.
3. A different and in some respects a still more useful effect is
produced by the employment of angular apertures. Sir JoHN HERSCHEL
has mentioned the inscribed triangle as destroying the rings round bright
stars. The principal inconvenience of such an aperture consists in the six
bright rays which proceed from the disk at equal distances. Great care is
necessary to prevent a small companion from being obliterated or distorted
by these rays. The disk of the star is not round with this aperture,
as it has been supposed to be, but hearangular; and a ray proceeds from
each side of the hexagon. If the focus is a trifle too short, the image
becomes triangular in one direction ; and if too long, in the opposite
direction, —the sides in the latter case occupying the situations of the
angles in the former. It is therefore possible to obtain an exquisitely
fine focal adjustment by reducing all the rays to an exact equality in
brightness. The illuminating power of the object-glass is reduced in
the ratio of about o'4 to 1. A kind of aperture usually more advantageous,
especially on stars of only moderate brightness, is an inscribed hearagon.
With this the rays (which are six in number, as in the triangle) are
much more feeble compared with the greater illuminating power of the
exposed area, the ratio of which to the whole aperture is more than o'8 to 1;
or double the area of the inscribed triangle.
4. It is sometimes very desirable to provide an antidote to the curious
but annoying tendency which is occasionally seen in the telescopic disks
of stars to become triangular, especially when the wind is in the east
or south-east. Such an antidote is effectually produced by cutting off
three equi-distant segments from the whole aperture of the object-glass,
156 Rev. W. R. Dawes, Catalogue of
the base of each of which is the chord of 60°.
Then, the chords being placed so as to coin-
cide in position with the angles of the
telescopic inverted image, those angles will
be reduced by the larger circular aperture
between the segments, and a fairly round A
image will be substituted for the triangular wº
one, the form of which usually approaches \
that of an obtuse-angled spherical triangle;
thus, -
The production of this triangular telescopic image is a very curious
phenomenon, and its association with the east wind seems unaccountable.
When I had the honour of receiving the late Professor STRUVE at my
residence in Kent, I mentioned the subject to him ; and he said he had
often seen it, but could not at all account for it. In reply to an inquiry
as to its probable cause, which I made on one occasion of Professor
WHEATSTONE, he informed me that the subject had been investigated
by some eminent German astronomer; but he could not recollect the
particulars, and I have never received from him any further information.
I have noticed it most distinctly in telescopes remarkable for exquisitely
fine definition. Yet that it does not arise from anything in the object-glass
itself may be proved by unscrewing it one-sixth of a turn ; when, if
the object-glass is in fault, the angles of the triangular image will take the
places previously occupied by the sides. I have also had an opportunity of
proving this when the phenomenon has been strongly marked, by
exchanging the object-glass for another at the time. On the occasion
of Mr. ALVAN CLARK's visit to me in the summer of 1859, he brought
with him two excellent object-glasses, one of 8 inches, the other of 8% inches
in diameter. On an exceedingly fine evening, the stars being almost
perfectly quiet, I was trying one of these object-glasses, and was surprised
to find a very strong triangular tendency in the disk of Arcturus, -one
of the sides of the triangle being nearly parallel to the horizon, but raised
a little on the eastern or following side. Mr. CLARK saw it exactly as I did.
On changing the object-glass for the other, after the telescope had rested
on the star for a few minutes, the image was as strongly triangular as

Micrometrical Measurements of Double Stars. I57
before, and precisely in the same direction. The wind was in the
south-east, but it was nearly calm. I have supposed that the cause
must exist in the temperature of the air in different parts of the tube;
but if so, it is difficult to imagine why it should be affected by an east
wind. That it is so I have frequently noticed, and on one occasion it
was proved with remarkable certainty. On an exceedingly fine night,
I had been observing with the 84-inch object-glass with great delight
till near three in the morning, the stars having been for several hours
beautifully defined and round. At that time I noticed an occasional
tendency to triangularity, lasting for a few seconds at a time. These
triangular fits increased in frequency and continuance; and I was greatly
surprised at it, inasmuch as the gentle wind had been all night nearly
in the south-west; and I noted down the occurrence before I left the
observatory as being an extraordinary deviation from the usual circum-
stances. On coming out of the observatory, however, I found that the
wind had changed to the south-east !
5. It may be worthy of remark, that a smaller aperture may sometimes
show a very delicate and close companion to a bright star, when a larger
aperture fails to show it. A singular instance in illustration of this
occurred to me when I was observing at Mr. BISHOP's observatory at
South Villa in the Regent's Park. After a totally cloudy day, a sudden
and complete clearance showed the stars with remarkable brilliancy ;
and to ascertain whether the night was as fine as it looked, I turned the
5-foot refractor by DOLLOND (aperture 3-8 inches), which I had at Ormskirk,
on to & Herculis. With power 400 the image was beautifully sharp and
steady; and the small companion was usually in loose contact, and at
best moments just separated from the large star. The one bright ring
passed outside of the smaller star, and in contact with it, but did not
distort it. The central distance was at that time about 14". Now, with
a 5-inch aperture, the bright ring being of considerably smaller diameter,
and also brighter, would pass through the small star, and elongate it
to such a degree as to make it appear like a somewhat brighter portion
of the ring. Thus it might happen, and I have no doubt has happened,
that the companions of such objects as & Herculis and 3 Cygni might
be seen with a smaller aperture, though invisible with a somewhat larger.
It is difficult otherwise to account for the fact that the companions of
158 Rev. W. R. DAWEs, Catalogue of
both these stars could not be perceived by Sir JAMES SouTH with his
exquisitely perfect 5-inch refractor under the finest circumstances, and
with various powers up to 787. - -
6. On such stars as the two just referred to, a considerable increase
of visibility may sometimes be obtained by a very slight variation in
the adjustment of the object-glass with respect to the axis of the tube.
To enable this to be made by the observer whenever required, the
adjusting screws should be accessible without removing the object-glass;
and not placed as they often are within the tube, which of course renders
it necessary to take out the object-glass in order to get at them: —an
operation by no means free from danger with the feeble light usually
employed in an observatory, and the observer probably without assistance.
By such variation of the adjustment, the ring round a bright star may
be attenuated to almost any extent on one side without perceptible injury
to the form of the disk; and thus a very minute companion may be
rendered plainly visible, which with a perfect adjustment of the object-
glass would not be seen at all.
7. It is a point of considerable interest to determine the separating
power of any given telescopic aperture. Having ascertained about five
and thirty years ago, by comparisons of the performance of several
telescopes of very different apertures, that the diameters of star-disks varied
inversely as the diameter of the aperture, I examined with a great variety
of apertures a vast number of double stars, whose distances seemed to
be well determined, and not liable to rapid change, in order to ascertain
the separating power of those apertures, as expressed in inches of aperture
and seconds of distance. I thus determined as a constant, that a one-inch
aperture would just separate a double star composed of two stars of the
sixth magnitude, if their central distance was 4”56;—the atmospheric
circumstances being moderately favourable. Hence, the separating power
of any given aperture, a, will be expressed by the fraction **. The fol-
lowing table is thus calculated, and may be convenient for reference,
containing ordinary apertures and the least central distances of stars
Separable by them : —
Micrometrical Measurements of Double Stars. I59
Aperture Least separable Aperture Least separable Aperture Least separable
in inches. distance. in inches. distance. in inches. distance.
// // &
I'o .. 4'56 4°o . . I I 4. 8-5 . . o'536
1-6 ... 2.85 4-5 ... I'ol 9°o ... o'507
2°o . . 2°28 5°o . . O’9 I 9°5 . . o'48o
2'25 . . 2'O3 5'5 ... O'83 Io'o . . o'456
2'5 ... I '82 * 6°o ... o'76 12°o ... o'38o
2°75 ... I'66 6'5 ... o'70 I 5"o . . O'3O4.
3'o ... I ‘52 7°o ... o.65 20°o . . o. 228
3°5 . . I'3o 7' 5 ... o.61 25°o ... o. 182
3°8 ... I ‘2O 8°o ... o. 57 3o'o . . o’ I 52
It might be not unreasonably imagined that the brightness of the
stars would make a great difference in the central distance to which any
given aperture could reach. But though it may make some difference,
it is in fact far less than would at first sight appear probable. This arises
from the much higher powers which the brighter stars will bear ; and as
the diameter of the disks does not increase in proportion to the power, the
separability of all magnitudes is nearly the same, provided the state of the
air is such as to bear well the increase of power. -
8. Nor is so great a difference as seems to be generally supposed
produced by a moderate degree of uncorrected spherical aberration.
I was struck with this fact nearly forty years ago, when I happened at the
same time to be in possession of one of the very best, and also one of the
worst, telescopes I ever had. The good one was made for me by DOLLOND;
and was of the ordinary size called the 2-foot; the focal length being 19%
inches, and the aperture 1.6-inch. It had, as was usual at that time, a
triple object-glass, and was in a portable mounting with sliding tubes, and
furnished with one of Dr. KITCHINER's Pancratic eye-pieces, magnifying
from 45 to 180 times; other eye-pieces of the Huyghenian construction
being afterwards added. With powers of 60 and upwards the disks of
o, Lyrae, Capella, Rigel, &c., were shown with scarcely the slightest trace
of a ring ; and the small companions of Polaris and Rigel were readily
seen, and not by myself only. The former, however, was often seen by
me with the aperture contracted to 1-4 inch ; and on one occasion, under
an unusually pure sky, with 1:3 inch : and this is the smallest aperture
with which I have ever been able to see it with certainty. As a contrast
to this exquisite instrument, I had a 45-inch refractor with aperture 2.75
16o Rev. W. R. DAWEs, Catalogue of
inches; but so bad was the figure that any aperture exceeding 1% inch
showed considerable spherical aberration ; and with the whole the error was
enormous. With the aperture contracted to 1-6 inch, the appearance of Castor
was almost precisely the same as with the perfect 2-foot ; and this first proved
to me that the ratio of focal length to aperture does not affect the size of
star-disks. But notwithstanding the wretched figure of the larger telescope,
any increase of aperture beyond I-6 inch was found to diminish the disks
so decidedly that the perfect little glass had no chance in the comparison.
The two double sets, which together constitute e Lyrae, were shown with
the 2-foot, e, (4) Lyrae, just neatly separated ; and e, (5) Lyrae, in close
contact, power 120. But with the 45-inch, both sets were widely separated
with the same power. Pursuing these observations, I came to the
conclusion that with the 23-inch aperture the disks were of proper size for
that aperture ; but that round the brighter stars the false and scattered
light was enormously too great ; and it is principally in this particular
that the effect of a bad figure is seen. Hence it follows that the tests of
Separating power furnished by close double stars are by no means to be
relied on as determining the character of a telescope ; and further expe-
rience has fully confirmed me in this opinion. The severest test of figure is
the similarity of the image of a bright star when the focus is a little too
long, and to an equal extent too short. If the rings in these out-of-focus
images are similarly disposed in both cases, the figure is perfect ; but a
moderate deviation from this perfect equality does not stamp a telescope
as bad, or even unfit for delicate work. And it is a fact, which I have proved
by experiment, that the difference between an object-glass which bore this
most severe test perfectly well, and one which fell obviously short of it,
was not to be discovered by any decided superiority of the one over the
other, either in separating power upon close double stars, or even in the per-
ception of faint objects close to bright ones; though this latter is more
likely than the former. The question is much more important how a
telescope shows a difficult object, than whether it can show it at all.
It is therefore my confirmed opinion that a list of test objects is of compa-
ratively small importance in the trial of a telescope, especially as so much
must depend on the eye and the habit of the observer, and the circum-
stances under which the scrutiny is performed.
9. In measuring the diameter of a planet with the webs in a parallel-
Micrometrical Measurements of Double Stars. I61
wire micrometer, it has no doubt been frequently noticed by other observers
as well as by myself, that when the web is brought to touch the edge of the
planet's disk, light is immediately seen on the outer side of the webs through
the effect of diffraction. This gives the impression that the measure is too
small. But if the web is withdrawn till this effect disappears, the measure
will undoubtedly be too large. To obviate the source of this error, I had
two sets of stout webs inserted parallel to the single webs, and at a
convenient distance from them : the proximate edges of the webs in each
set being about 4" apart. Like the single webs, these can pass each other
so as to allow of measures being taken on both sides of the zero point.
In measuring the diameter of a planet, the edges of the disk are placed
in the middle of the interval between the webs of each set, where they
are seen sharply defined and entirely free from distortion. I believe that
results thus obtained are much more worthy of reliance than those derived
from the use of single webs, and at least equal to those produced by the
double-image micrometer.
10. A curious fact with which I have been familiar for more than
thirty years, may perhaps be worthy of notice in this place ; namely, that
stars at Small altitudes require a shorter focus than those at large altitudes,
to be seen with perfect distinctness. Of course the difference is slight,
yet it is decided and constant. It is independent of the brightness of the
object, but yet is, I think, most obvious when the actual difference of
magnitude is just so far in favour of the lower star as to render its
apparent brilliancy equal to that of the higher. I was first struck with it
when observing at Ormskirk, with DoILOND's 5-foot refractor, the stars
n Coronae, & Scorpii, and po, Bootis, within a short space of time ; and I
have noticed the same with every telescope of whatever dimensions with
which I have since observed. -
11. It may be a matter of sufficient interest to deserve notice here, that
much fatigue of the eye in long-continued observation will be saved by the
exercise of great care never to commence observations of any object with
too short a focal adjustment. I have met with instances in which young
persons, in reality not at all short-sighted, (as was proved by very distant
objects and even the features of the Moon being accurately described,) who,
nevertheless, in adjusting the focus of a telescope for themselves, would
always set it far too short for my own eye, which requires a deep No. 9
ROYAL ASTRON. SOC. WOL. XXXV. Y
162 Rev. W. R. DAWEs, Micrometrical Measurements of Double Stars.
concave of DoDLOND's scale. This obviously arises from an involuntary
shortening of the focus of the eye attending the intense effort to see
perfectly well while setting the focus. It is well known that such an
effort has this tendency ; and I cannot doubt that in many instances
the projection of stars on the Moon, when the disappearance occurs at
the bright limb, arises from this cause. Be this as it may, it is certain
that a very adjustable eye soon becomes fatigued by continued observation
with a focus much shorter than is suitable to its natural and usual
condition ; and the adjustment of the telescope will require to be gradually
lengthened. But when care is taken to avoid any constraint upon the
adjusting apparatus of the eye, by the instrumental adjustment being
at first rather too long than too short, the eye will quietly accommodate
itself, and may work on delicate and difficult objects for many hours
together without conscious fatigue ; and may continue its efforts from
time to time, as from experience I can testify, for half a century with
scarcely any perceptible deterioration.
MAGNITUDES.
IN the following Catalogue of Measures the figures in the column of
Magnitudes indicate the Magnitudes of the objects as estimated or deter-
mined at the time of observation. In these estimations, previously to the
year 1848, the scale was not so uniform as might be wished ; and the
magnitudes assigned are usually lower than those in subsequent epochs.
The change arose from my having reduced STRUVE's theoretical scale
to a practical system by the use of limiting apertures, as explained in my
communication on the subject to the Society, which appeared in the
Monthly Notices for June 1851 (vol. xi. No. 8). In every instance where
the magnitudes were determined by gauging with apertures the figures
are expressed decimally in the column. All others are merely estimated.
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Micrometrical Measurements of Double Stars.
# § Epoch
No. # § . Notes.
& .92
> >.
628 & O P. W. 39-672 | Cephei 316 B. Notched, but never separated. Dist, a good estimation.
629 || 7, 9 — 47°o3o 219. A, white; B, purplish. Clouded completely. -
630 || 7%, 9% Sph. Cr. ’934 Rºy. The small k is too faint for distances when the image is
631 | 73, Io P. W. 54.805 Obs, made with Alvan Clark's 73-in. object-glass. Night unfavourable.
632 e e -º-, -808 || With same telescope. Bad night. Two of the angles observed with 357.
- 6 33 7°o, 9'5 tº- •82 I sº.A. gyellowish; B, greenish. The small >k does not
634 e - Sph. Cr. ‘838 Same telescope. Thin clouds rendered the small k faint during mea-
- sures of distance.
635 7}, IO P. W. 4o'844 x 23. Small >k very faint. A., yellowish ; B, light blue. Dist. very
636 || 8, 10 -** 4I '814 Tºog. -
6 37 73, Io Pr. Cr. 43' 928 *::::: º: i. #*** the air being foul with haze and
6 38 O tº P. W. 54°ooo Disks much diffused through haze; the small k scarcely visible.
639 © & -mºn 47-893 || 2 25. Both stars white. Moon very bright.
64o 8-6, 8-9 º-º 53-888 || Much diffused. -
641 8-6, 89 — '98o | Difficult from diffusion of disks.
642 5'5, 5-6 Sph. Cr. 53-9 I 5 | * Cassiop. Requires a better night. Both stars pale buff.
643 | 6’o, 6.1 | P. W. 54.809 || With Alvan Clark's 73-in, object-glass. Night brilliant, but bad.
644 || 3}, 8 -- 41-800 | n Cassiop. A, yellow; B, blue, Night very bad.
645 || 4, 7% tº- 54'ooo | Usually very well seen.
646 6, 6 -gº 39°759 || 65 Piscium. Clouded over.
647 © O - 54-ooo Occasionally well seen.
648 º º of 5 | Very hazy and unsteady. Soon clouded completely.
649 e - 39'688 36 Androm. Generally much confused.
65o 7, 7% tº- ‘784 Obs, good.
651 6%, 7 --> '980 Both stars yellow.
652 6, 6 - 40.814 | Both stars deep yellow. Sadly confused and unsteady.
653 | 6%, 7 -º-º '857 | Both stars deep yellow. Very undefined and unsteady.
6 54. e G -> •86o Both stars orange-coloured.
6 55 6%, 7 eams 4. I'oS2 A, deep yellow; B, lighter yellow. Daylight.
656 6, 6% -- 'o60 | Both deep yellow. By daylight; generally well seen.
657 | 6, 6% -º-º: '847 | Both orange. Generally well seen.
658 || 7, 7% -> ‘874 | Ditto colour. Generally confused.
I66 Rev. W. R. DAWEs, Catalogue of

: # # | < § # à | <
No. Designation. # i. º | Position. ; ; É # j ; §
9. O O
659 || 36 Androm. | 73 c 46's; 67.1 i 32íos 5 || 33 42O 1%iz 4 || 28 42O
66o (continued) e tº • * e e 323°33 || 7 | 18 35o | I'o61 || 6 || 13 || 35o
661 © © e 323°35 | 5 || 26 || 520 o'995 || 5 || 26 || 520
662 º 32478 || 4 || 9 || 35o | I 165 || 4 || 9 || 35o
663 e e e 323'98 || 3 || 9 || 35o | I’og I | 3 || 9 || 35o
664 © 324-65 || 6 || 27 | 35o | I 134 || 6 || 27 | 35o |
665 © 325' 15 || 6 || 3 I | 35o | I’og6 || 6 || 32 || 35o
| 666 & © e 321°7o:| 2 || 3 || 3oo
667 321°27: 3 || 6 || 3oo
668 © e e 328-28 || 3 || 13 || 322 .
669 328.70 || 5 || 38 572
67o © Q o 329-28 || 3 | I 5 3oo || 1:255 || 4 | I 2 || 3oo
671 e O Ǻ e • 3.2997 || 4 || 38 || 38o | I'oZ3 || 6 || 34 || 38o
672 328'38 || 5 || 42 || 322 -
673 e e e . . . I'124 || 4 || 19 || 475
674 O © 327-88 3 23 435 . . . e -
675 © 329'97 || 2 || 8 || 184 || I'227 || 4 || 14 | 184
676 e 33o°72 || 3 || 25 || 322
677 e e 332°o2 || 3 | I 8 || 375 | I 173 || 4 || 22 || 375
678 © 334'59 || 5 || 28 || 353 || O'98o || 2 || 8 || 353
679 e º 334-47 || 5 || 35 | 591 || 1: 113 || 6 || 22 || 353
68o [336'72]| 4 || 13 | 275 || 1:223 || 4 || 25 | 275
681 © º o [336'44]| 4 || 14 412 || 1:213 || 4 || 3o 412
682 e © e 334°58 || 5 || 38 308 || 1' 164 || 6 || 27 | 308
683 © º © e & 334-25 || 5 || 28 || 308 || 1:178 || 4 || 19 || 308
684 © e • * 335'88 || 5 || 39 || 815 || 1:227 | 6 || 53 815
685 | Anonyma. 86 |o 57 17 | 96 17 | 167°o3 || 5 || 18 || 320 | 12:509 || 4 || 12 || 320
686 tº 9 - 167'58 || 4 || 2 I | 185 | 12:55o || 6 || 23 185
687 © 167'o'; 3 || 9 || 3oo º
688 e G º e 168°33 || 5 || 25 | 185 | 12:449 || 4 || 14 | 185
689 42 Ceti I 13 || 1 12 8 || 91 18 || 33 o'77 || 5 || 27 || 3oo
Micrometrical Measurements of Double Stars.
167
o, 1:
3 $3
E É Epoch
No. § § 18oo + Notes.
s: §
659 || 7, 7} | P.W. 41°899 || Sometimes well separated, but furred and unsteady.
660 | 7, 7} | Pr. Cr. 42.918 Both deep yellow. Vision bad; stars only occasionally separated.
661 || 7%, 7% {-º-º-º: ‘958 Interrupted by clouds.
662 7%, 7% tºº 43°724 Stars separated by glimpses only.
66 3 | 72 7% tºmº •7 89 Stars usually in utter confusion; constrained to desist.
664 7, 7% gºmºg ’9 Io Only occasionally separated.
665 7, 7% tºmº '929 | Stars unsteady, but sometimes well seen.
666 * @ P.W. '95o | Cloudy. Stars very faint and confused, and twirl excessively.
667 tº ºs * -º-º: 44'oo? | Stars never separated, but an elongated nebulous mass.
668 63, 7 tºmºmºe 46'799 || Sometimes well separated, but too unsteady for good distances.
669 || 7%, 7% sººn '914 At times admirably seen.
- 670 7, 7% ſº ‘942 | Sometimes well separated and perfectly neat, but very unsteady.
671 || 7%, 7% ºp '951 | Stars exquisitely defined after a sudden clouding. -
672 || 7, 7% tºº •961 At times the stars are exquisitely defined, but twirl greatly.
673 tº e Sph. Cr ‘961 | Same night. Observations with double-image micrometer.
674 7, 7% P.W. 47.893 | Sometimes well seen, but usually very unsteady.
675 63, 6% Sph. Cr '928 The stars are just neatly separated, but the power is too low,
676 tº º P.W. '951 Observations by Sir John Herschel.
677 | 63, 6; tºmº 5o’9 Io | Both reddish-yellow ; well separated.
678 º º tºº 53-865 Clouds precluded more observations of distance.
679 tº º tº-g -876 | The power would suit the object admirably if the air were good enough.
* ſº Sometimes very well seen. Obs. with Mr. Bishop's prismatic crystal
68o © º Pr. Cr. 891 micrometer by Dollond. Zero of pos. rather doubtful.
68 I ºmºmº .8o 1 | Same night and same microm. Vision improved, and this power is
tº º 9 better. Zero of pos. rather doubtful.
682 tº º Sph. Cr •893 || Brilliant night; vision very variable.
ſº e º Both stars orange. Not very favourable, but measures very carefull
683 || 6-2, 67 || – 914 || “... 9 y y y
684 e Q P.W. 54,748 With Alvan Clark's 73-in. object-glass. Admirably seen in general and
3. very steady. -
685 7, ºmº 40.814 | x86 = }. III. 73. Stars sadly diffused and very unsteady.
686 7, tºº 4 I'797 | Pos. tolerable; dist, indifferent.
687 tº tº-g '874 Stars often scarcely visible; dist, impracticable.
688 tº º tº-º '921 | Bad vision; hazy and windy.
* 42 Ceti. Both stars white. Ten measures of the double dist, were
689 7, 8 gº-ºº '958 taken as an experiment (= "'454). -
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Micrometrical Measurements of Double Stars.

t; GD
No. # -- # . º Notes.
s: §
690 6%, 8 P. W. 42-978 || Both white. Usually much confused.
691 6%, 7% tºº '986 At first tolerably well seen; confused towards the last.
692 || 7, 8 | Pr. Cr. 43-8o3 | Vision lamentably bad; stars seldom divided.
693 || 6, 7 tºº '91 o Rarely seen double. Confused and very unsteady.
694 o P. W. 54°oS8 | Unsteady, but often well seen. Clouded.
695 6-7, 7-5 iºn *735 With Alvan Clark's 73-inch object-glass. Both pale yellow; well seen,
but dancing.
696 ſº tº tºº-ºº: ‘822 | Same telescope. Very unsteady, but at times well seen.
697 4, II tºº 39°74O | *p Cassiop. A and B. A., golden. Difficult from excessive diffusion.
698 || 4%, Io; cºmmºns 54.075 | Very difficult.
699 || II, 12 ſººn 3974o ºb Cassiop. B and C. Much diffused and faint. Extremely difficult.
7oo | Io; io; isºmº 54.075 | Diffused and unsteady, and excessively difficult.
7ol 7%, 7% iº 397 Io P. i. 123. Much confused.
- 7o2 || 7, 7 tºº 4o'8 I4 Stars not separated.
703 || 7, 7 gºmº, ‘844 Very unsteady and ill defined.
704 || 7, 7 = . •872 | Stars white. Vision far from good.
705 |[9, 9}] ſº 41-o;2 | Vision excessively bad.
706 || 7, 7% cºmmºn •8oo | The air is so bad that a second measure cannot be procured.
707 7}, 7% tºº ‘847 | Pos. very good; Dist. pretty good.
708 || 7, 7 - •874 | Both white, excessively confused.
709 || 7, 7% == ‘882 | Usually separated, though furred and very unsteady.
7 Io * º 42'oi6 | The night of the worst description; clouded.
7 I I 7, 7 tºº 'o.44 | Sometimes pretty well seen.
712 8, 8 tºº 1977 | Vision bad at first, but became better.
713 || 73, 8 gº-ºº: - '988 Very seldom seen double.
714 || 8, 8 Pr. Cr. 43-849 || Occasionally divided, but usually confused.
715 7%, 7% +|Sph. Cr. 47'935 | Increasing haze extinguished the stars, both of which are very white.
716 | 73,72 | P. W. Szoº Wºº" "
717 º, tº tºmº 54°o79 hºº and very unsteady. The preceding star thought rather the
718 || 7-9, 8°o tº-g 'ogo Bright moon near the star; the northern (following) k a trifle the
smaller. Very unsteady, but well separated. -
719 || 7%, 7# tºmº 4 I'942 | x 155. Stars white. Disks diffused and unsteady.
720 8, 8% º ‘947 | Stars white; disks diffused and unsteady. Telescope shaken by wind.
ROYAL ASTRON. Soc. VoI.
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Micrometrical Measurements of Double Stars.
171
th *
3 $3
# # Epoch
No. ă, É 18oo + Notes.
cº spºt
> >
72 I gº P. W. 42'918 Obs. pretty good.
722 || 8, 8 - '986 Air very smoky, and rather hazy.
723 9, 9 Pr. Cr. 43.874 | Stars variable in brightness, and much diffused.
724. P. W. ‘95o | Stars very faint through clouds.
725 | 7%, 7% tºº 44°ooo | Haze and smoke nearly extinguish the stars.
726 7%, 7% tºmºsº 48°939 | Both white. Bad vision.
727 &ºm=º 53'877 Greatly diffused; no reliable distances to be obtained.
º * * is Very unsteady, and greatly diffused. Sky splendid. No good distances
728 |7' 5, 7' 5-H | Sph. Cr. 9I 5 to be procured.
729 7-8, 8.2 P. W. '98o | Both pale yellow. Well seen at times, though often greatly diffused.
73o 4%, 43 + = 46.9 54 y Arietis. Both white. Definition and steadiness nearly perfect.
73 I 4-H, 4 Sph. Cr. 47'928 White stars. Half distance measured.
732 || 4 + , 4 *E*º '934. Half distance measured.
Pr. Cr. 2°g 5 I | 2 Piscium. Stars excessively confused.
733 42'95
734 4, 6 P. W. 46-923 || A, very white; B, white.
735 .. tº- 53-975 | Stars extremely unsteady, and rarely well defined.
736 * tº ‘991 | Very unsteady, and variable in brightness through thick haze.
737 8, 8% ºmºg 42'830 | y, Androm. At best moments there is certainly an elongation.
738 | 73, 8 Pr. Cr. 43' 17o | Both blue. Occasionally a decided elongation.
739 5, 5% P. W. 46.808 || Both greenish blue. Decidedly elongated, sometimes notched.
74O || 5, 5% wº 47-893 | Both green. Occasionally the elongation is notched.
& Both blue. A measurable notched wedge. The air will not bear high
74.1 | 53, 6 tºmº 48 669 power, but the definition is at times very good. -
742 | 43, 5 tºgº '973 || Both blue. Occasionally a good elongation.
gºmº º Very fidgety, and sometimes much diffused. ... At best the elongation is
743 4% 5 6 53 726 decidedly notched. Pos. measured vertically.
744 – 790 Tolerably seen at times, but it is clouding. Measured horizontally.
745 4, 5} tº '814 | Both pale green, precisely the same tint. Air fine.
746 e tº tºmºmº ‘88o At times very well seen, but never separated.
With Alvan Clark’s 7#-inch object-glass. Never quite divided, though
7 gº *7A.8 there is a dark line across the deeply-notched disk. The smaller star
74 54"74. is flattened a little at the point of contact, A, green; B, deeper green.
Io Arietis. A, white; B, purplish 2 The air has become excessively
748 6, 9 — |46'954 bad.
749 || 6%, 8% tºº 47.91 o A, white; B, purplish f Clouded.
75o 6, 8% gº 49°oo3 A, pale yellow ; B, pale blue. Unsteady, but sometimes well defined.
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Micrometrical Measurements of Double Stars.
I73
# *
f - - # Epoch
No. # É I8oo + Notes.
> >
75 I tº º P. W. 53-88o Usually well seen, but rather unsteady.
752 | 6′5, 8'5 gº '995 || A, white ; B, purplish: Stars much diffused.
753 || 9, Io * 41.948 | x 218. Much haze at this altitude.
754 8%, 9 gºmºmº 962 | Stars very faint through haze and diffusion.
755 | 8%, 9 gº 44°oo4. Both white. The disks greatly diffused.
756 e G gº 5 4'o68 The stars are hazy, diffused, and unsteady.
757 | 8, 11 gº 4o'999 | x 221 = H, III. 68. Obs, difficult from the bad condition of the air.
758 || 8, 1o | – |41'o60 | Clouded. -
759 8, Io º '767 | Bad vision.
76o 8, 9} tºmº '8oo | Clouded, and soon rained heavily.
761 | 8, 9} º ‘929 Disks very much diffused.
762 | 8, 10 | Pr. Cr. 42.912 | Both white. -
763 8, 10 | P. W. 43-oog A, yellow; B, blue or purple. Occasionally neatly defined.
764 8, 103 || Pr. Cr. 1849 || Scarcely measurable from diffusion.
765 | 8, 11 | P. W. |44.ooA | A, white. Very difficult through diffusion.
766 || 7-7, 9:o <º 54.091 | Diffused, and the small star is therefore faint. Bright c near.
767 º º º .8o3 With Alvan Clark's 73-inch object-glass. Clouded completely.
768 || 7-7, 9-o º •8O8 sº, º rºº unsteady and diffused.
769 8:o, 9°5 tº-e '830 sº.º º 3. B, purple. Well seen. A 3rd star C ;
77o 7%, 7% - tº Lº 41'948 | x 240. Both white.
771 8%, 9 * '950 | Both white. Deplorable vision.
772 | 8, 9 Pr. Cr. [42:951 | The stars are often diffused and very unsteady.
773 || 7%, 7% P. W. 44°ool | At times well seen, but varies much in brightness and definition.
774 o º- 54.074 | Diffused and often faint.
775 6, 8 Cº-º 39.874 Cassiop, A and B. A. white ; B, bluish white.
776 5, tº E_º 41-814 | Excessively diffused and becoming cloudy.
777 || 5, tºº 48-o&8 || A, yellow; B, purplish.
778 5}, Io º 39.874 Cassiop. A and C. Clouded. A, white; C, blue.
779 || 5, 9 --> 48.088 A, yellow; C, blue. Usually well seen.
78o 8, 9} º 40-844 P. II. 89 = }. 1. 21. A, yellow; B, pale blue.
781 | 8, 9} º '999 | Both white. Stars scarcely separable through diffusion of the disks.
I74
Rev. W. R. DAWEs, Catalogue of



No. Designation. ; # ź ... * | Position. ; * i # ; # ;
*5. 3 ſº 3 B: ſh-
t h m 8 || o / O *- - | // -
782 P. II. 89 269 || 2 19 24 || 6o 48 || 341-43 || 5 || 13 || 420 || 1:875 || 4 || 1 || || 420
783 (continued) .. 342-63 || 3 || 20 | 3oo | 1931 || 4 || 20 | 3oo
| 784 342'o6 || 7 || 34 || 353 | 1969 || 6 || 3o | 353
785 342°31' | 3 || 12 | 184 || I'753 || 4 || II | 184
786 - e. e - 34o'44 || 3 || 14 | 200 | I '789 || 4 || 12 || 2 oo ||
787 y Ceti 299 || 2 35 32 87 24 || 289'58 || 3 || 1 || || 360 || 2:912 || 4 || 14 || 360
| 788 289°52 || 5 || 27 | 360 || 2:718 || 4 || 14 || 360 |
789 287:35 5 20 | 32O || 2'852 || 4 | I 2 || 32O
| 790 287'92 || 3 || 1 || | 320 tº e e - •
79 I 289'oz | 5 || 37 6oo || 2:692 || 6 || 24 6oo -
792 289°o8 || 5 || 4o 42O || 2:701 || 4 || 29 || 42O
793 288-77 | Io 63 || 420 || 2:748 || 4 || 20 || 420
794 288-90 || 6 || 34 420 || 2:662 || 6 || 31 || 420
795 288-60 || 5 || 22 ...} 2.876 || 4 || 13 || 3oo
796 289°28 || 6 || 56 || 420 || 2:640 || 4 || 34 || 420
797 284°os | 2 || 7 || 35o || 2:681 || 2 || 7 || 35o
798 284.88 || 2 || 5 | 185 || 2:670 || 2 || 5 | 185
799 285'23 || 3 || 1 I 520 2.586 || 3 || 14 || 520
8oo 288'92 || 6 || 24 420 || 2:692 || 6 || 24 420 |
8o I 286-28 || 5 || 27 | 35o || 2:683 || 5 || 27 | 35o |
8oz 283'97 || 1 || 3 || 35o || 2:646 || 1 3 || 35o
8o3 © 288-63 || 6 || 39 520 |
804. 290-63 || 3 || 24 || 572 || 2:770 5 I 572
805 289° 18 || 5 || 39 322 || 2:754 || 4 || 20 | 322 |
8oé º 288°oo || 3 || 12 435
807 288-73 || 3 | 12 322
8O8 288-67 || 5 || 35 | 26o tº e
809 288-63 || 5 || 42 572 || 2:823 5o 322
8 Io 289°8o || 5 || 37 572 2'592 || 4 || 2 o 572
8 II º 288-17 | 3 . I9 || 435
8I 2 e Q e 289.67 || 3 || 13 || 375
Micrometrical Measurements of Double Stars. I
75


No.
782
783
784
785
786
787
788
789
790
791
792
793
795
796
797
798
799
8oo
8o I
8oz
803
804
805
8oč
807
808
809
8 Io
8II
812
794 |
o, *
.# $8
E # Epoch
§ É 18oo + Notes.
> 5
8, 9% P. W. 41'o69 | Both white.
8, 9% -* 47°o77 || A, yellowish ; B, dusky yellow.
7.6, 9'o wº- 53°994 || A, light yellow; B, light blue.
Sph. Cr. 54'o88 || The night appears splendid, but is very bad.
P. W. •o88 Obs. on the same night as the last.
3, 8 -- 4ozoa. 1 | y Ceti. Stars badly defined and unsteady.
. tº- * I I 5 Telescope often shaken by the wind.
4, 9 º- ‘94O | A, yellow; B, blue. Haze and unsteadiness render the measures difficult.
23, 8 - 41'o62 || A, yellow; B, blue; very decided colours.
2}, 8 tº- •o; 5 || At first pretty steady and well defined; thin clouds formed afterwards.
3, 7 -4 '882 At times very well seen, but very unsteady.
3, 7 - '891 || Occasionally well seen, but usually confused.
4, 8 -* '959 | Very unsteady and confused.
4, 8 wº- 42'038 A, yellow; B, blue.
tº A, yellow; B, greenish blue. At first very steady and admirably defined;
3, 7 tº-mº I 34. latterly faint through smoke and haze. -
2}, 8 Pr. Cr. '912 Clouds soon overspread the sky. Assumed zero of distance.
2
tº- '918 Circumstances very unfavourable.
2}, 8 - '95 8 || Vision excessively bad. An assumed zero of distance.
2
3, 7 P. W. 43°oo8 Stars seldom tolerably seen.
2 Occasionally pretty well defined, but very unsteady, and the smaller star
3}, 9 Pr. Cr. 'ogo faint. Dist. with assumed zero.
• Excessively unsteady and ill defined. Aperture reduced to 5%in. Assumed
32 9 - O4. I zero of dist. - -
P. W. • OOI A, yellow ; B, purplish. At times well seen, but usually confused and
3, 7 • WV. 44. unsteady. -
3 7 -* 46'906 Sometimes exquisitely defined, but seldom very steady.
3.
3 7 cº-º '91 4. A, yellow; B, blue.
2
3, 7 - '954 A, yellow; B, light blue. Became excessively unsteady and ill defined.
3, 7 -* '98 I A, yellow; B, blue. Air very bad.
tº-º-º-º 47°o3 6 Obs. interrupted. -
3, 7 - 'o69 | Frequently most beautifully defined, and sometimes pretty steady.
3, -º-º: '893 Well defined, but unsteady.
-º '951 Observed by Sir John Herschel. -
3, 7 --> 48.973 || Air not good enough for distances. Stars very flashy and dancing.
ſo an:50ſogoO ‘SEAVOI "I’M Aoºſ 941

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* - É § * É §
Micrometrical Measurements of Double Stars.
177
E # Epoch
No. § § 18oo + Notes.
> 3.
813 P. W. 53:88o | Stars very unsteady. Ther. 24°.
814 wº- 54 (53 At times well seen, though above 2% west.
815 & º tºº "I 59 || Usually very unsteady, with transient better views.
816 |7, 7+| – |41.89 |*:::::::gº ºn."
817 sºmeº 54'000 | Very unsteady in general, with tolerable intervals.
818 || 7, 8 gº 41912 | Arietis 114 B. Stars white. Bad vision; wind high.
819 | 73, 8 tºº ‘929 || Ill defined and unsteady.
82O tº ſº {*msº '934 Ill defined and unsteady. Clouds.
82 1 || 7%, 8% tºº '948 || A, white; B, cream coloured. Unsteady, but sometimes pretty well seen.
822 8%, 9 tººl '959 || Hazy and smoky ; stars very unsteady.
823 7, 8 tºº '96 I | A, white; B, rather yellow. The stars twirl excessively.
824 8, 9 Pr. Cr. 42'912 | Both white. Vision is very confused.
825 || 7, 8 tºº 43°ol I | Both white. Seldom separated; vision intolerably bad.
826 7, 8 P. W. 44°o25 | Both white. Thick haze and smoke interrupted the observations.
827 | 7%, 8% gº *O27 | Both white.
828 7%, 8 º 47'O77 | Both white.
829 || 7%, 8% — ‘893 | Both pale yellow.
83o 8, 8% * =º 48'939 | Both white. Vision is very bad.
831 7%, 8 tºgº 5 I '994 | The angle seems to be decreasing, and the distance increasing.
832 || 7, mºmº 53°77O | Both very white.
833. tºº ‘855 | Usually very unsteady, but improved during measures of distance.
834 e Q * '99 I | Thick haze. ...
835 tºº '994 | Sadly diffused in general, rendering the measures difficult.
836 7:7, 8.5 || Sph. Cr. 54-844 With Alvan Clark's 73-in. object-glass.
| 837 || 5 #, 9 P. W. 48.973 | * #. *: B. A., pale yellow ; B. light orange. Very unsteady;
838 6, 6% tºº 4o'ogo Arietis. Moulds sadly, and is not often distinctly divided.
839 6%, 7 tºº 41.ogo | Both stars yellowish. Often perfectly separated and tolerably defined.
84o 7, 7} *= ‘882 | The stars are at times seen well separated.
841 5%, 6 — 42 "O44. Transient tolerable glimpses amidst confusion and unsteadiness.
842 6, 6% gº-ºº: • I 3 I | Stars pale yellow. Occasionally well defined and tolerably steady.
843 6, 6% sºmeº * I 34 Both yellowish. The definition is frequently exquisite. The disks are
just distinctly separated.
Roy AL ASTRON. Soc. Vol. XXXV.
A. A
178
Rev. W. R. DAWEs, Catalogue of

2% # +s # É +s
§ #3 || R.A. | N.P.D. #| # 5 § #| | | 8
No. Designation, |gå%| 1856. 1850. Position. § | { à .3 # & É
- ăg # 5: P+ ſº # 5: a
- • a 3 h m s o y O // tº-
84.4 || 8 Arietis 333 || 2 5o 39 |69 16| zoo'43 || 6 || 17 | 420
845 (continued) 198:30 || 3 || Io 520
846 195'97 || 6 || 47 {:} O'95 est. . . I
847 195;68 || 5 || 44 || 572 |o’8 est. 3
848 196-27 || 2 || 13 640 e G tº wº
849 e & . . . . . o'845 Io 69 || 475
85o 196'5o || 3 || 36 || 435 |o'9 est. || 1 || 2 || 435
851 195' 18 || 3 | 18 || 38o
852 194'45 || 3 || 17 | 38o tº º
853 196'32 || 5 || 33 || 5oo |o'993 || 4 || 1 I 5oo
854 195'55 || 6 || 31|| 353 |roog | 6 || 12 || 353
855 Anonyma. 369 || 3 7 24 |50 4| 26'52 || 3 || 20 || 360 |3-82.3 || 4 || 18 || 360
856 27°oo || 6 || 3o 3oo -
857 27.72 || 5 || 35 | 184 || 3-5 12 || 4 || 24 184
858 26.63 || 3 || 23 38o || 3:664 || 4 || 23 38o
859 28°o8 || 3 | 20 | 353 || 3:649 || 6 || 4o 353
86o Ceti 26'04 || 5 || 26 || 353 ||3:519 || 4 || 20 | 353
86 I {2}. Ac. ..) 3 Io 42 91 29 | 66'90 || 1 || 3 ſ: o’8 est. 2 || 48o
862 tº e 73°48 || 5 || Io |; o:7 est. 2 390
863 © tº 75°35 | 3 7 || 390 || O'7 est. . . 2 | 390
864 Anonyma. 389 || 3 18 9|31 9| 62.66 || 5 || 28 357 |2-824 || 6 || 33 || 357
865 || 7 Tauri A&B 412 || 3 2 5 34 | 66 3 || 263-47 || 6 || 25 420 || O'6 est.
866 tº e tº º 259'92 || 3 | 16 {{...} o:65 est. . . 2
867 Anonyms [59] | 3 30 15 44 28 || 348-32 || 3 || 28 26o &
808 e e 348-88 || 3 || 24 || 3oo 2°28o || 4 || 23 3oo
869 348-79 || 3 || 14 268 || 1.829 || 4 || 18 268
87o 347-49 || 3 || 17 | 353 |2-501 || 6 || 28 || 353
871 © tº 349-40 || 2 | 12 268 || 2:473 |Io 68 268
872 | Anonyma. 425 || 3 30 39 56 23| 103-48 || 3 || 15 || 360 |3°o31 || 4 || 16 || 360
873 Ioz'zo || 5 || 15 320 |3°ooo || 6 || 12 || 320
874 Ioz'72 || 7 || 32 32O || 3°o2O || 4 || 22 || 32O
Micrometrical Measurements of Double Stars.
No.
844
845
846
847
848
849
85o
851
852
853
854
855
856
857
858
859
86o
86 I
862
863
864
865
866
867
868
869
87o
871
872
873
874
- § - § -
f; # Epoch
§ É 18oo + Notes.
> §
6, 6% | P. W. |43°oog | Both white. Generally in utter confusion. No distances can be procured.
7, 7% -º-, 44'oon | White stars. Occasionally distinctly separated, but soon became too
* - confused to measure.
5}, 6 * 46'907 Both yellowish. Very well separated, and at times very meatly defined.
6}, 6# †-ºmº 47°o39 Both straw-colour. Definition perfect. Distance of centres compared
with the diameter of one thread. -
6, 6% - || "O42 | Both pale yellow. Clouded.
6, 6% Sph. Cr. '833 | Both pale yellow.
5%, 6 P. W. '894 | The stars are too unsteady for good distances.
e e == '95 I Sir J. Herschel’s measures; who has remarked, “Very satisfactory,
but long out of the habit of measuring.”
tº º º '95 I | Stars well separated.
5, 5% ºmmº 49°oo3 | Both pale yellow. The air sadly deteriorated before the obs, of distance.
cºmme 53'995 || The might will not advantageously bear higher power.
6}, 7 *g 4O’ I 52 2 369. Obs. under tolerable circumstances.
7, 9 ... — 44'oo I | Both white. The disks are diffused, with great unsteadiness and twirling.
7, 8 Sph. Cr. |47'92 Usually well seen. Very high wind, with lightning and flying showers.
929 y 2 § g
7%, 8 P. W. 48°o88 || Both white.
6%, 8 tºmºsº 52'o61 | Very unsteady, but occasionally well seen.
© 9 *sº 54'088-| At times well seen, but usually shivering and confused.
6%. Io -> •748 95 Ceti. Discovered to be double by Alvan Clark, and observed with
32 54'74 his 73-in.object-glass. Haze formed and extinguished the small >k.
5%, to tºº •822 || A, yellow ; B, purplish 2 The air will not bear sufficient power at this
- altitude.
• gºmº. ‘83 I | The air is not good, and the object is very difficult.
7, 8% *= 54"754 | x 389. Obs. with Alvan Clark's 73-in. object-glass. Stars very unsteady.
§
8, 8 4- 4 I '957 || 7 Tauri, A & B. At best slightly notched.
7, 7% *- 46'907 A decidedly notched elongation.
7}, 8 * 47°o3 I | O > 59. Haze and clouds interrupted the observations.
7%, 9 -º-º-e ‘O4 I | Haze flying across makes the stars variable in brightness and unsteady.
7:7, 8.5 tºº-º- 5 4'o69 A, pale yellow ; B, browner yellow. The night does not bear power.
#º 'o68 || Night brilliant and bad. Stars sadly diffused and unsteady.
* @ tº-º-º: • 12o At times well seen and pretty steady, but the night is hazy, and will not
bear power.
7%, 7% º 4o'o.41 | x 425. Seldom tolerably steady or well defined.
8, 8 ºmºsºme ‘975 | Stars are greatly diffused.
73, 8 ºsmº 4 I'oZ I Often cloudy.
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Micrometrical Measurements of Double Stars. 181

|
§ #
# # Epoch -
No. § É 18oo + Notes.
> >
875 |7% +, 7} | P. W. 47°o3 I | The preceding star thought to be rather the smaller.
876 || 8+, 8 || Sph. Cr. 48: 134 || Both very white; the preceding thought rather the smaller.
877 || 7}, 7# P. W. '94o An easy object carefully measured under bad circumstances. A very
white ; B, greenish white.
878 7%, 7% gº 49'014 | White stars. Thick haze formed.
879 |7% +, 7% t=º 52°ol 6 || Vision bad. The preceding star thought rather the smaller.
88o || 7-2, 7:3 sº 54°oo I | Both white. Very well seen.
88 I º tº- "O74 || Unsteady, but sometimes well seen.
882 7%, 7% | Sph. Cr. 48 I 34 || Tauri 34 B. Both white. The half-distance measured.
3 -
a. ºmº- •8 P. III. 17o. A, yellowish ; B, light orange. In contact. Pos, ob-
883 || 6%, 7 47-833 served with a single thread. Half-weight allowed.
884 6, 6% P. W. ‘894 A, white; B, reddish white. In contact. Air not sufficiently favourable.
y
- tº- º 32 Eridani. A., yellow ; B, green; decided colours. Very unsteady
885 5, 7 4"949 | * and much diffused skybriant.
886 5, 7 tºmºmºn 42'039 || A, yellow; B, blue or greenish. Air unfavourable.
tº A, yellow; B, blue ; very decided colours. Assumed zero of distance
887 || 5, 8 | Pr. Cr. 43-ol I 'and calculated correction of angle. 3.
888 || 6 8 ºmº 'ogo Same colours. Extremely unsteady. Assumed zero of dist. and cal-
2 culated correction of angle. -
889 || 4, 6 Sph. Cr. 48. 131 | A, yellow ; B, deep blue. Distance carefully taken by running B of one
set repeatedly through A of the other by a free motion of the pos. circle.
890 5, 63 | P. W. 52°oso | A, light yellow; B, light green. Very unsteady and flashing.
80 I ºmmºns 'o6 Stars diffused and unsteady. Obliged to use a diminished aperture and
9 º 54'o69 low power.
892 || 9, Io ºmsºmº 4o’og I 2.494. Thick haze.
893 8, 8 tºº 41.959 || Stars faint from dew on the inner surface of the object-glass.
894 | 8, 8+ * 42°o39 Stars very white. Much haze afloat.
895 || 8, 8% tºº 44'ool | Stars very white. Disks sadly diffused.
896 || 7%, 7% ºmmº- •o 17 | Both brilliant white. At times well seen, though very unsteady.
897 || 8, 8 *- ‘o28 || Hazy, which increased till the stars disappeared. -
- { - Both white. Distance measured by passing A of one set and B of the
898 || 73, 7# Sph. Cr. 48 I 3 I other centrally over each other by free motion of the pos. circle.
899 7#, 8 P. W. 52: 167 A neat star, well seen. > * .
º With Mr. Bishop's micrometer. Zeros assumed from the previous
90o tº e Pr. Cr. 53' I 34 night’s observations. -
90 I 7.5, 7-7 | P. W. 54°ool Glimmering, with occasional fine views.
902 || 7-5, 8'o ºs- •o88 || At times well seen. -
- •o6 + s f 4o Eridani. Excessively difficult. The distance cannot be
903 || Iok, II *mme 51°oo I measured. d but still th
º x 520. Both white. Very bad vision, but still the stars sometimes
904 || 8, 9 mºme 4 I of I neatly separated. -
905 | 73, 7% smºº *2OO | Both white. Neatly divided.
182 Rev. W. R. DAWEs, Catalogue of

§§ | # +3 * § #| | *
No. Designation. # * º Position. ; * - É i f # É
*S 5 35
- h m s o O – // -** *-*mm
906 | Anonyma 520 || 4 9 19 | 67 34 || 98.5o || 6 || 28 || 420 o'88o || 6 || 24 420
907 (continued) tº e I oz'90 || 5 || 17 | 353 || O'975 || 4 || 8 || 353
908 || Tauri 23o B | 535 || 4 15 o |78 59 || 347:30 || 3 || 15 || 360 || 2:01.5 || 4 || 15 || 360
909 345'97 || 5 || 2 I 320 | 1920 | 6 || 23 320
9 Io 346-52 || 5 || 23 420 | 1982 || 4 || 20 || 420
| 911 346'57 || 5 || 14 || 320
912 345'97 || 3 || II | 3oo
- 42O
913 345"Io | 6 || 3 I }: 2°o I2 || 4 || 19 || 3oo
9I4. 344.70 || 6 || 4 |{:}| 1:875 || 4 || 27 | 3oo
9I 5 343’5o || 3 | I 2 | 3oo tº º
916 347°3′o || 4 || 8 || 35o | I '822 || 4 || 8 || 35o
917 345.45 || 3 | 10 3oo |
918 345' 18 || 3 | I 2 3oo tº e
919 © 344-38 || 3 || 28 3oo | I '928 || 4 || 34 || 3oo
92O 343-67 || 3 || 12 184 || 1:850 || 4 || 12 184
92 I º 34.3°78 || 5 || 14 || 375 -
922 342.93 || 5 || 26 || 357 || 2 IoI | 4 || 14 || 357
923 . . . 342°14 || 5 || 34 || 296 || 2:039 || 4 || 23 296
924 || Anonyma 546 || 4 18 16 || 71 13 | 187°82 || 3 || 12 || 320 || 7-219 || 4 || 12 || 320
92.5 de 186'52 || 5 || 15 420 e - e tº e
926 we tº 187°oo || 3 || 23 268 || 6′747 || 4 || 3o 268
927 | 8o Tauri 554 || 4 21 36||74 42 14.92 || 5 || 28 || 360 | I-665 || 4 || Io 360
928 \ 1460 || 3 || 14 || 320 |
929 I I'38 || 3 || 6 || 420 |
93O Io'o8 || 6 || 14 || 3oo
93 I o 1 I'98 || 6 || 32 3oo
| 932 I 1.87 || 5 || 26 || 3oo
933 tº gº Io'63 || 2 | 12 38o || 17 est.
934 Anonyma | 559 || 4 24 52 | 72 18 || 278-88 || 3 || 13 || 360 || 3'o61 14 || 360
935 - 277.32 || 3 || 14 || 268 || 2:859 || 4 || 17 | 268
936 277°ol || 5 || 4o 268 || 3:029 || 6 || 44 268
Micrometrical Measurements of Double Stars.
E # Epoch
No. § É 18oo + Notes.
> >
906 | 8%, 8% | P. W. |42°131 | Sometimes well separated, but faint, the moon being near.
907 - e. * 54"I 34 | Seldom seen double. Sky hazy, and will not bear power.
908 || 8, 9 g-º- 4O' IO4 Tauri 23o B. BARLow-lens before the micrometer.
909 || 8, 9 — 41'oZ2 | Unsteady and often confused. -
9Io 8, Io * , "I 81 | Favourable.
9 II | 8, Io tºmº ‘929 || Stars seldom separated.
912 || 8, Io tº-º '962 stars remarkably unsteady.
9 I 3 || 7, 9 ºmmºn 42"O45 || Two angles observed with 420, but the star is better seen with 3oo.
914 | 8, 9% * =º- ‘I 23 || Often cloudy, with fog. Stars unsteady, but tolerably defined.
915 8, 9% *g 43°oo9 Stars white. Very confused.
916 || 8, 9% | Pr. Cr. 'oZ4 || A, white; B, dusky. Much confused.
917 | 8, P. W. 44°o I 7 | Both white. Vision extremely bad.
918 8, 9 tºº 46'943 | Thick haze, terminating in cloud.
919 || 7%, 8% Gºmº- 47'o'77 | Neat star, admirably seen.
920 | 7%, 8% Sph. Cr. 48: 132 | Both white. Power of the Sph. Cr. Microm. rather too low.
92 I e P. W. 52'o44 Too unsteady for measures of distance. -
92. zº, sº | – |ºse, Wºº Aºi º"' ºr
923 tº- ‘822 | Same telescope. Well seen in general.
924 || 9, II *º- 40’94o | x 546. Small ºk faint from haze.
925 | 8, 1 I *= 41-891 | Stars diffused. Dist. cannot be measured.
926 - 7°7, 9'5 º-º 54'ogo A, pale yellow. Bright ( , but not very In 68]".
927 | 6, 8 tºmº 4O'IO4 || 8o Tauri. Vision excessively bad.
928 7, Io º • 17o
A, yellow ; B, blue 2 The star is unmeasureable to might with anything
929 6, Io ºs 42'O45 like certainty. C - *
930 || 7, Io ºme 44°ool | A, yellow ; B, scarcely visible.
93 I 7, Io *º •or 7 || A white; B, reddish. Usually confused, with better intervals.
932 7; Io * ‘o?9 || A, white. B not always visible.
933 | 68, 9 º 48°o88 || Night splendidly clear, but definition very bad.
934 º º 4o'ogo || > 559. Stars miserably diffused. -
935 | 7°2, 7°2 tºº 54'091 | A fine star, but sadly fidgety, and often much diffused.
936 || 7-2, 7.3 * 134 | Very white stars.
#81
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Micrometrical Measurements of Double Stars.

w *
3 $3
E # Epoch
No. # 9 18oo + Notes.
* - s .S.
> >.
937 7:2, 7-3 | P. W. 54,159 | Both white. -
| 4 - . Ox 91. Both white. Not quite separated. O 2's mags, are 7 and 7%
938 || 8%, 9 * 47'o'77 which are much higher than they appear to-night. y
939 6%, Io * 47'o'77 || 5 Aurigae. A, pale yellow. Elegant object. Very bright © with halo.
94o 9}, 9% tºmº 4o'I 18 x 622. Air very thick. -
941 64, 7} | Sph. Cr, 48'1 12 || 14 Orionis. Both white. Suddenly clouded.
e & e With Alvan Clark's 73-in. object-glass. Air deteriorated after measures
942 || 6-8, 7.3 | P. W. 54.822 of position. z -
943 | 8%, 9 * 42' I 72 | X 648. A, red; B, paler red. Rather unsteady.
944 || 7, 9 ſºmº 44'o.39 A, white. Very variable in brightness, and furred.
945 || 7%, 8% &=º 46'981 | A, reddish; B, dusky purple º Air bad.
... . . . . Both pos. and dist, measured with illuminated webs in a dark field.
946 e tº |º 48°og I Distance not to be depended on.
º ſº o & The night will not b ; it is cold and wind d star-disk
947 || 7-6, 8' I sº *=== 54." I 3 I .." not bear power; it is cold and windy, and star-disks are
8 ſº 2. IO2 || 14 Aurigae. Tel. shaken by the wind. A 3rd Sk m. p.mag. 12 +. A
94. 5, 8 42' I 9 driving scud obscures the stars.
949 || 5’7, 8°o tº a 54’og I A, yellow; B, blue. Very fine star.
95o 83, 9 ºsmºsº 4 I'943 || > 657. The star is hazy, very faint, and only occasionally elongated.
951 || 9, 9 º 41'205 || > 694. Both white. Vision indifferent.
952 || 9, 9 tº-º 42' 129 | Both white. The night will not bear a higher power.
g Both yellow. Disks seldom separated. The southern >k thought to be
953 9-H, 9 , sºme 162 rather the smaller.
954 || 9, 9} | Pr. Cr. 43' 178 || Both white. Very faint.
955 7%, 7% * = ºr 205 || Both white. Neatly defined.
* n Orionis. Discovered by me to be close double last night, Jan. 15.
956 || 4, 5 - P. W. 48-o42 With a k 10 m. n.f. it forms H. vi. 67. A, white; B, purplish white.
957 || 4, 5} Sph. Cr. • II 2 | Pos. measured with a single web in the micr.; allowed half weight. Star
very fidgety.
958 • P. W. * I 59 || Stars very tremulous and confused.
5 1. tºº * I 72 | Stars unsteady and flashy.
959 || 4, 53. 7 y
960 tºº 192 Daylight. Air too unfavourable. Clouded.
961 e tº — “211 Daylight. Occasionally pretty well seen.
962 tºº • 2 16 || Sunshine. Unsteady, but at times well separated.
963 º tº "249 Daylight. At times well seen, but unsteady.
964 e & ſºmº 255 | Sunshine. Sadly unsteady, but very well separated in general.
965 s smºsº ‘257 | Sunshine. Occasionally very well defined and steady.
966 || 4, 5 tºmºmºmº 51'o60 | Not well seen.
e A, white; B, purplish. Extremely tremulous, though the night is appa-
967 3, 4} | – 154 "rently splendiá. y
ROYAL ASTRON. Soc. Vol. xxxv.
B B
I86 Rev. W. R. DAWEs, Catalogue of
: # +S º § # +5 º
No. Designation. ### i. º | Position. # § : É É # - :
&c. #| B | & ſº #| B | &
L–1 O O
f tº º h m s O / I O // *-m-
968 m Orionis 5 15 56 |92 32 || 91-71 : 5 || 17 | 375 | I 127 || 4 || 9 || 375
969 (continued) - 86.22 || 5 || 21 353 I'o8o || 4 || 8 - 353
97O Anon tº º 86 I 5 || 5 || 20 | 353 | I 38o || 4 || 1 I | 353
97 I *} 719 || 5 zo 33 || 6o 35 | 328°os || 6 || 29 || 420 o'91 I | 6 || 3 || || 420
972 A and C tº º e ‘b’ 351-85 || 3 || 26 || 420 | I 5-201 || 4 || 3o 420
973 º: }. 5 21 28 93 26 79 oz. 2 || 7 || 353 || O'82O || 2 || 4 || 353
974. - • © e - 8o'67 || 5 || 24 || 353 || O'815 || 4 || Io 353
975 || 32 Orionis | 728 5 22 46 | 84 Io 205'97 || 5 || 34 || 6oo o'904 || 6 || 32 6oo
976 204:38 || 3 || 17 | 572 || O'825 || 2 || 6 || 572
977 © e e e - 204'43 || 5 || 28 478 o°898 || 4 || 14 || 478
978 || Tauri 380 B | 742 |5 27 26|68 6| 249.87 || 5 || 2 | 320 || 3:287 || 6 || 36|| 320
979 . . 24893 || 5 || 25 || 420 || 3:335 | 6 || 38 || 320
98o 25ozo; 6 || 42 || 3oo || 3'223 || 6 || 47 || 3oo
981 e 249'85 || 6 || 29 185 3.286 || 6 || 29 | 185
982 251'o6 || 3 | 18 184 || 3:343 || 4 || 13 | 184
983 250-70 | 1 || 6 || 268 tº dº tº tº
984 251-67 3 22 268 || 3:252 || 6 || 43 268
985 251.35 | 3 || 26 || 268 || 3:219 || 6 || 48 268
986 6, Orionis || 748 || 5 27 54 |95 3o 35o'57 || 5 || 41 || 26o || 3:828 || 4 || 25 26o
987 | 63 Orionis 5 28 1 || 95 31 || 127-80 || 6 | 18 190 || 2:792 || 4 || 1 2 | 190
988 ~. 127°23 || 1 || 2 | 190
989 I 25-77 || 3 5 I 9o - 2' 5 est. . . 190
990 º º tº º I 24'47 || 5 || 25 26o || 4 II 3 20 26o
99 I º 5 27 59 |94 56| 222: 14 || 5 || 19 || 184 || I'836 || 4 || 8 || 184
992 e tº © º . . 218 17 || 5 || 24 {{...} 2: 179 || 2 || 6 || 467
993 || Anonyma. 750 || 5 28 6|94 28 || 61-82 || 3 || 13 || 360 tº º
994 | t Orionis 752 || 5 28 6 96 1 || 141:72 || 3 | 18 322 || 1 I-689 || 6 || 32 322
995 tº gº - © tº 14o'90 || 3 || 2 || || 478 || 1 I'54o || 4 || 25 478
996 {* 5 28 33 95 44|| 186°oo || 3 || 9 || 184 || I est. . . tº º
997 e G 181-80 || 5 || 13 || 467 || 1:589 || 4 || 5 || 467
998 I 84'41 || 3 || 7 || 353
Micrometrical Measurements of Double Stars.

T # Epoch
No. 5, $2 18oo + Notes.
cº, .3
> >
968 e Լ P. W. 51.181 | Night splendid in appearance, but vision is not good. This pos. is omitted
in the mean result.
969 e Q dºº- 52'o61 | Air not in a sufficiently good state for this star.
97o Aº Q *m-sº 52: 167 Air usually bad. This dist. is not included in the mean result.
97 I 8, Io tºmº 42' I 34. 2719. A., reddish yellow ; B, purple. Sometimes very well seen and
distinctly separated. -
972 8, II tºmº-ºn 135 | C is white. Generally very well defined and pretty steady.
973 || 7" I, 7.4 *º- 54'ozo D 6; found to-night. Both pale yellow. Requires a better night.
974 || 7-4, 7-6 tº- 172 | Both pale yellow. Well seen at times.
975 5, 7 tºº- 4.1.203 || 32 Orionis. Neither well defined nor steady.
6 & ºs- º A, white; B, pale pink. Dist. of centres compared with the thickness
97 5%, 7 47°o39 'of the web.
977 5, 7 tºmmºn 48.216 | Unsteady, and often only in contact.
978 || 7, 7% º- 41'o'72 | Tauri 38o B. Both white.
979 || 7, 7} tº- 18 I Generally well defined.
98o 7, 7% — 42° 162 | Both yellow. Pretty steady.
- w Both white. The night i tlv splendid, but vision is ext l
981 || 7%, 8 Pr. Cr. 43' 17o º Zºe e night is apparently splendid, but vision is extremely
982 | 73, 8 || Sph. Cr. 48: 134 || Stars white. Hazy, and soon clouded.
983 G - P. W. 54' 126 Clouded permanently.
984 || 7'o, 7' *- • I Both pale yellow. Usually well seen and pretty steady.
34. y p
985 || 7-3, 7.7 tºm- 14o | Both pale yellow. Vision very good. Clouded immediately afterwards.
86 I O emi- “O 4, Orionis (C and E of the trapezium, according to 2). C, pale yellow;
9 73, 47°o39 || 8, p
E, reddish f yellow. Obs. with illuminated threads.
987 6, 12 — 42° 162 4, Orionis (A of the trapezium, and its small companion F). The small
6 >k bears a slight illumination. -
988 , I 2 *- 192 | No doubt of the small star, but vision is too bad for measures.
989 5, [14] - '975 Small k seen by glimpses only. Very bad night.
& A, yellowish; B, blue? Often steadily seen; a fine lucid point. Illumi-
990 | 6, 1 I — 47°o39 mated threads employed, and dist, therefore rather doubtful.
- º 42 Orionis. A very elegant object whose duplicity I discovered to-night.
99 I 5, 9 Sp h. Cr. 47 946 It is in no catalogue of double stars.
º Difficult from unsteadiness and bad definition, which put an end to the
2 e vi wº G p
99 5, 9 P. W. 48° 173 observations. y
993 || 7, 8 ºmº 40° 142 | x 750. Too unsteady for measures of distance, which is about 4}".
994 | 3, 7% º-g 46'981 ) . Orionis, A, white; B, pale blue. Air bad.
995 e * 48.216 Daylight.
996 8, 9 Sph. Cr. 47.946 D 3 = L. 10567. Its duplicity was discovered by me on Nov. 1. Both
- stars are white.
997 | 73, 8 P. W. 48.979 || At times distinctly separated, but very unsteady. Dist. very uncertain.
998 || 7%, Io *º 52' I 67 Unsteady and badly seen. No measures of distance can be procured.
ſo on 30/0700 “SAVCI “I M. Aegi 88 I

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Micrometrical Measurements of Double Stars.
f # Epoch
No. # É I8oo + Notes.
s: §
999 || 7, Io P. W. 4o'94o 26 Aurigae. A, yellow; B, blue. Vision bad.
I ooo 6, 8 - 42' 172 A, pale yellow ; B, purplish?
Ioo I 5, 8 tº sº 54." I 3 I A, pale yellow ; B, pale blue. A fine star.
I OO2 ſº * =sº 4o'o'71 & Orionis. Too confused for measures of distance.
I oo3 || 24, 6 dº a • I I 8 Observations good.
IOO4. * * "I 48 Generally steady. Obs, good.
Ioo; 2, 7 *-ºs '94O | A, white; B, purplish. Obs. indifferent.
Iooč 2, 4% ſº 4I 183 || Beautifully defined and very steady.
I oo7 2, 5 tº-ºmº ‘zoo Very steady and beautifully defined.
I oc8 || 2, 5 iºnºsºg 42-186 Daylight. Both white. Extremely unsteady and ill defined.
e The stars are brilliant, but ill defined and unsteady. Assumed zero of
Ioog | 2, 6 Pr. Cr. 95 I distance and calculated correction of angle.
IoIo 2, 6 — 43°o75 A, very white; B, white. Definition very bad ; aperture 4% inches.
Assumed zero of dist. and calculated correction of angle.
IOI I 2, 5 P. W. 46'907 || A, very white; B, white.
I O I 2 • ſºmeº 47°167 Observations interrupted. +
IOI 3 tº & sº 48° I 59 Air bad. Aperture reduced to 43 in., with which the observations were
€8Slel”.
Io 14 || 2, 6 tºº ‘I 73 || A, white; B, greenish white. e
I O I 5 || 2, 5 *sº .211 | Sunshine. Exquisitely defined during measures of distance, afterwards
much less favourable.
IoI6 2, 6 gººs ‘244 Daylight. Unsteady. Stars placed vertically by prism for the angles.
* e With Mr. Bishop's crystal micrometer. Air very bad. Intense cold;
Io 17 {{ Pr. Cr. 53°131 || "... i.e. -
Io I 8 tº º P. W. 54.175 Excessively unsteady and flashy.
IoI9 || 7%, 8 # Eº 48°16o | x 796. Night unfavourable.
I O2O || 9, Io — 40-151 | x 835. Difficult from diffusion and faintness.
Ioz I 8'o, 9'5 ſºme 54"I 75 A, white or pale yellow; B, light green 2
tº ſº zºº & o A. C. 3 = Bessel (Weisse) v1. Io9. Its duplicity was discovered by Alvan
Iozz 6'5, 9°o tº-º-º: 54"I 72 Clark. A, yellow ; B, blue or lilac.
Ioz3 || 7, 8% tº Eº 48.217 || 4 Lyncis. A, white; B, purplish & Neatly separated at times.
Io24 || 7-8, 8'3 * = . 5 I 195 || Aurigae 229 B. A., white; B, purplish.
I O25 || 7'5, 8:3 tºº 54."O75 Both pale yellow. A meat star, well seen in general.
{} x 921. A, light yellow; B, light green. Small k diffused and faint;
Ioz6 6%, 9% tºº 48'16o probably estimated too small. * *
1oz7 || 7, Io — ’217 | Hazy. A, light yellow. .
I oz8 8%, 8% tºmº 48.192 | x 932. Both light yellow. Brilliant night, but very bad.
I oz.9 || Io, Io; * * 41.211 | x 942. Stars much diffused and faint: exceedingly difficult.
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--


Micrometrical Measurements of Double Stars.
I91
65 tº .
rtſ $3
*- # # Epoch
No. § É 18oo + Notes.
> §
to39| 6 io | P. W. |40'105 || 15 Monocerotis. Pos, tolerable; Dist, poor.
Io9 I | 6, Io º ** 15 Observations tolerable.
Io92 || 6, Io — "I I 9 || A, yellow. There is a very small × n.f A, P = 11°-o8+.
A, yellow ; B, blue. Pretty steady and well defined. There are two small
Io.33 || 6, 9 tºº 4. I*228 *...*, A C, P = 12°62; D = Io”84; A D, P = 307°o8; D = 40”.
. = I2. Im. ; D = II ºn.
Io94 6}, 9 *me 48° 16o A, light yellow; B, light blue or green. A 3rd star C, 10% m. n.f at a
large angle; and a smaller D (= 11 m) n p, more distant.
1935 | 5, 5% | – |41.187 | 12 Lyncis, A and B. Both white.
Io96 || 6, 6% º 206 | White stars. Air bad.
io37 6, 7 | Pr. Cr. |43' 176 | Pery white. Usually much confused.
Io98 || 6, 63 | P. W. |48-217 | Both white.
Io99 e G º 4*187 | 12 Lyncis, A and C. A., white; C, light blue.
Io4o 6, 9 # = • 206 A, white; C, blue. -
I O4. I 6, 9 Pr. Cr. 43' I 76 A, white; C, blue. Measures difficult from the blurred condition of the
disks. e
IoA2 8, 9} | P. W. 48.25o | x 964. Measures of distance rather difficult from diffusion of the disks.
ro43 || 53, 9 Cºmº, 4°149 || 38 Geminor. A yellow; B, blue.
IoA4 || 6%, 8 * =º 4 I'O23 | Same colours. Well seen. ---
Ioa 5 || 5, 8% tº-ſi 42'939 | Same colours. Star ill defined. •
Io.46 6, 9 Pr. Cr. 43' 146 A, yellow. Occasionally pretty well seen. Assumed zero of distance
and calculated correction of angle.
Io47| 5, 8 || P. W. 48 ig2 | A. light yellow; B, light green. Very unsteady.
I oA8 dº ſº tº-º 54, 175 | Very nicely seen in general, and sometimes pretty steady.
1049 || 7, 7% | Pr. Cr. |43°168 | x 1037. Mean of four nights.
Ioso | 7, 7+| P. W. . 48°173 | Both very white. At times well seen.
Io; I | 3%, 12 * 4o 152 | X Geminor. Small star scarcely visible. Observation nearly worthless.
IoS2 || 3%, Io; tºmºsº 54. I 54 || A, light yellow ; B, blue. Air bad, rendering the observation difficult.
IoS3 || 9, 9} tºº 4o°ogó | x 1070. Obs. worth little.
IoS4 || 9, Io gºmº. 42'045 | Star badly seen.
Io; 5 || 8%, Io tºmº ‘I 32 | Very variable in brightness, but at times well seen.
Io;6|| 8, Io tº-º 151 | Small star very faint sometimes.
Io;7 | 8, Io gº ‘I 73 || Both white. Stars often faint and not very steady.
IoS8 || 8%, 9} * 49.264 | Both white. Vision is not very good.
Io99 || 7#, 8 ſº 4O' I 49 | x 1083. The air is so bad that the measures are difficult.
I of o 8, 9 tºmº 4 I ‘249 || Night wretched, though apparently superb.
fo on 5oſofoo ‘SIMVCI I'M Aoû z61





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* | F |#| | | | | # |# * || 3:
Micrometrical Measurements of Double Stars.
I93
wº *
# # Epoch
No. # # I8oo + Notes.
>. >
Ioé I 7, 8 Pr. Cr. 43' 179 Vº means good. Assumed zero of dist, and angular COT.
I of 2 | 8°o, 8.7 | P. W. 54; 176 || A, yellow; B, brownish yellow. Well seen in general.
I of 3 © ºmmºn 40’044 Castor. Unsteady and ill defined.
loé4 tº º sºme ‘o? I | Pos, tolerable; Dist. very poor.
1065 e gºssº- •og6 Observations good.
| Io96 || 3, 4 tº-ºn *3O2 With my own micrometer employed at Ormskirk. Obs. pretty good.
Ioé7 — "3 I 5 | Same micrometer. Daylight. Well defined, but unsteady. Obs, good.
1068 2%, 3 — |41-225 | Both white.
Ioë9 || 24, 3 *E. 42'039 || Very bad air. Aperture diminished to 4% in.
I O’o 3, 3 # *- 42'26o The stars are at times beautifully defined, but are very unsteady.
I of I smº ‘263 | Stars well defined, but tremulous.
Io'ſ 2 gº-ºº ‘266 | Disks at times admirably round and sharp. Daylight. Obs. perfect.
I of 3 gammams ‘268 Daylight. Pos. good; Dist, moderately good. -
Io?4 || 3, 3} | Pr. Cr. 43°o 31 Hº: º .* and ill defined. Assumed zero of dist. and
I of 5 || 3, 3} * 165 | Interrupted by clouds. Assumed zero of dist, and calc. angular corr.
| Io'ſ 6 4, 4% gº ‘zo.3 cloudy, and the stars are faint.
1 oz7 – ac, Vºjº ºn tº
1oz8 2}, 3 | P. W. |46'954 | Both very white.
I of 9 tº ſº — 47°23 I Passing clouds cause varying brightness.
Io9'o 23, 3} * ‘298 || Seldom well defined or steady.
Io9 I tº e *mº '304 || Daylight. Pos. good; Dist. moderately good.
Io92 © tº *º *342 Sunshine. Exquisitely defined, and at times perfectly steady.
Io93 2%, 4 Sph. Cr. 48: 132 Pºłº,h º allowed. Aperture reduced to
Io94 o gº 143 | Perforated aperture, to reduce the light to the low power.
Io85 P. W. 151 | Interrupted by clouds.
Io96 * 157 Clouded.
Io87| 2%, 3% gamm *2 I 2 oº: exquisitely seen. With this power the stars look like two
Io98 || 2, 3 gº “24 I | Neither steady nor well defined, but great care bestowed.
Io99 || 2, 3} smm mºnº ‘246 || Occasionally the stars are admirably defined, though not very steady.
Io90 * ’255 Daylight. Sometimes well seen, but tremulous.
io9 I tº º iſºmº ’257 º Usually the stars are perfectly defined, and at times very
ROYAL Astron. Soc. Vol. XXXV.
C C
Jö on 5070700 “STAVOI M M Aoû #61


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Micrometrical Measurements of Double Stars.
195

w; +:
-3 $
E # Epoch
.S. -
>. >
Io92 2, 3 P. W. 48-285 | Stars placed vertically by prism; 2}" west. By lamplight.
Io93 º 49.264 At times well seen.
Io94 ſºmsms "313 Daylight. Usually well seen.
Io95 º ‘ ‘335 Daylight. Stars excessively fidgety.
Io96 tºmmº “337 Daylight; brilliant sunshine; sky nearly cloudless.
Io97 tºmº 51'o61 | Perforated whole aperture.
Io98 tºmºsºs 149 || Perforated whole aperture. Occasionally well seen.
Io99 tºm 154 | Very tremulous, but the disks are sometimes good.
I IOO *g • I 81 Pº whole aperture. Disks beautifully meat and small, and bright
- enough.
I IO I E--> "I Q5 Perforated whole aperture.
I I O2 & tºº • 198 || Cloudy; the stars disappeared.
II of º º sº 257 Daylight. The disks are splendid.
I IO4. tºmº ’26o Daylight. Sometimes well seen.
I Io; iſºmºsº ‘290 sº Perforated whole aperture. Admirably seen; sometimes
I 1 oé * tº ’296 Sunshine. Usually very well seen and pretty steady.
| II of *º 52.201 || Very unsteady, and often much deformed.
- * With Mr. Bishop's Prismatic Crystal Microm. Double dist, observed
I Io9 Pr. Cr. 53' I 32 with a zero from single images.
I IO .142 | Another set on the same night and with same microm. The half-dist.
9 cº 3 observed on each side of the zero point.
Y I I O e tº ſº ‘I 34. Same microm. Unsteady, but sometimes sharply defined. The double-
dist. observed with a zero from single image.
I I I I Sph. Cr. * I S9 Some half-distances observed, but some uncertainty in the value of scale
with this arrangement.
I I I 2 P. W. 54. 135 Hazy and unsteady.
I I I 3 *sº 151 | Night brilliant and very bad. The stars are like balls of cotton.
e Sometimes admirably seen. A dense sea fog came over immediately
I I I 4 * I73 afterwards. Ther. 28°.
I I I 5 mºmº .26o With Alvan Clark’s 7}-in, object-glass. Usually unsteady, with good
sharp views.
I I I 6 * ’266 | Same telescope. Admirably seen at times.
I 1 17 smºgºsº 268 || Same telescope. Air bad; aperture reduced to 5 in.
I I I 8 tºmºmº ’279 || Same telescope. At times well seen, but very unsteady.
I I I 9 sº-ºº: 54°28o oz 175. With Alvan Clark's 73 in, object-glass. The star requires a
better night; it is a notched elongation.
I 120 7%, 7% *sº 4 I*2O5 | x 1121. Unsteady, but tolerably defined.
II 2 I | 7, 7 *E*Eº 4o 181 | P. vii. 170. Stars excessively diffused; too bad for distances.
I I 2.2 4}, I O sº 4 I 201 | x Geminorum, A, yellow; B, pale blue. Small star conspicuous.
ſo on 5070700 “SIMVCI I'M Aoû 961


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Micrometrical Measurements of Double Stars.
I97
§ *
# # Epoch -
No. # É 18oo + Notes.
> >
I 123 7%, 8 P. W. 4o'I 16 || Cancri 17 B. Obs, good. -
II 24 || 7, 7% - I 19 | Sometimes admirably defined and beautifully steady.
I 125 | 68, 7 G-mºs 142 Clouded.
I 126|| 7'o, 7. 5 — 54°og 1 | A, pale green; B, pale yellow. Beautiful object, well seen.
I 127 * 154 Admirably seen in general.
II 28 7, 1 I --> 4o 1 16 || 11 Cancri, A, yellow; B, blue.
I 129 -º 4o-o/2 & Cancri, A and B. Distance impracticable.
I 130 6, 6% -º-º: * IoS Obs. moderately good.
I 131 6, 6% mmºn • I 16 || Both stars yellow.
I 132 6, 6% --> • I 19 | Both yellow.
II 33 || 5, 5% tº-sº “I 78 Obs. pretty good.
I 134 6, 6% - 271 | Usually very bad definition.
II 35 | 6, # - .313 With my own micrometer. Bad circumstances.
I 136|| 6, 6# t- "3 I 6 Same micrometer. Very favourable. Pos, almost perfect; Dist, excellent,
I 137 6, 6% mº 41'o64 || Never distinctly separated.
I I 38 6, 6% cºmmen- 'o'72 | Pos, good; Dist. pretty fair.
I 139 6, 6% - ‘I 8 I | Pos. good; Dist. pretty good.
I 140 | 6, 6% * 203 Obs. pretty good.
I 141 || 5, 5% º 318 || Circumstances tolerably favourable.
I 142 6, 6% ºsmºms 42-140 | The disks are greatly furred and very unsteady, but there is little twirling.
I 143 | 6, 6% --- 173 | Sometimes beautifully defined. -
‘I 144 || 6, 6% -º • 192 Obs. very satisfactory.
I 145 || 6, 6% ºms 26o | Sometimes very well defined. Obs. very good.
1146|| 6, 6% º 266 At times admirably seen. Pos. excellent; Dist, very good.
I 147 | 6, 6% -*= • 268 || Occasionally well seen.
1 148 6, 6% | Pr. Cr. 43' 146 || Haze flying across, but at times the stars are pretty well seen.
II 49 6, 6% * . 162 Transient sharp views. Brilliant sky, with an east wind.
Vision became so bad as to break off the obs. Assumed zero of dist., and
1 150 | 6, 6% *g 165 computed angular correction. }
I 151 | 6, 6% -º • 168 | Transient; tolerable views amidst sad confusion.
I U52 6, 6 * º 17o Occasionally the stars are neatly defined.
II 53 6, 6 * tº-º-º: 176. Stars admirably defined, but not quite steady.
Jö on 3oſp?po 'SEAVOI 'I M. Aegi 861



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Micrometrical Measurements of Double Stars.
I99

F: # Epoch
No. § É 18oo + Notes.
> >
II 54 6, 6% | Pr. Cr. 43' 181 || Occasional good views.
II 55 6, 6% º ‘266 || At first well seen, but towards the close much worse.
II 56 6, 6% P. W. 47.231 | Steady, and admirably defined. Clouded.
II 57 | 6, 6% | Sph. Cr. 296 || Perfectly seen; not a particle of scattered light.
II 5 8 6, 6 # — - 48. I27 | Star about 5° from the Moon, which has a large halo round it.
1159 || 6, 6% | P. W. 165 | Stars well separated, but very unsteady.
I 16o 6, 6% ºmº- *2 I 2 Light yellow stars; beautifully seen occasionally.
1 161 6, 6% sº ‘246 At times very well seen.
I 162 6, 6% ammº ’255 | Extremely unsteady, but at times well seen.
I 163 © tº tºº-º-º *257 Daylight; admirably defined with this high power.
I 164 6, 6 à * 285 | Both yellow; C is greenish yellow, as large as A, but less brilliant. .
1165 6, 6% *- 49°253 | Both light yellow. Occasionally pretty well seen.
1166 | 6, 6; tº- 264 || Nicely seen in general.
1167 6, 6% º-º-º-º: ’283 | Not well defined in general, and extremely unsteady.
I 168 e — 313 Daylight. Well seen, and pretty steady.
I 169 e mºnº “335 Sun shining brilliantly. Stars very tremulous, and much diffused.
I 17o e tºmº 51'o61 | Very tremulous.
I 171 tº Q sºmsºmº * I j4 | Very unsteady.
I 172 tºmº 258 Clouded.
I 173 — .261 | Unsteady and glimmering.
II 74 © & ºmºsº .277 At times beautifully defined, but unsteady. *
I 175 6, 6% º- ‘290 Exquisitely defined in general, and at times steady. By daylight.
1176 & gºmºmº .320 Daylight. Well defined, but unsteady.
I 177 6, 6 % º 52'2OI sº #:sº li ºnal good views. The three stars are getting
I 178 e G - 22; Brief tolerable glimpses.
I 179 6, 6% tºº-ºº: ‘252 Both pale yellow. Vision is at times very good.
II 8o © tºº 54"O73 Very unsteady, and softly defined. -
With Alvan Clark’s 73-in. object-glass. Very well seen in general, and
II 81 tºmmºn •266 pretty steady.
II 82 º ºmº ’279 sºlºre. Daylight. Stars sadly unsteady, but sometimes well
| 1 183 6, 6 ºsmº 4o. 116 & Cancri, A and C. Stars yellow. Bad circumstances.
I 184 || 6, 6 º ‘I I9 || Yellow stars.
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Micrometrical Measurements of Double Stars.
201
*

E Q} Epoch
spºt 8
No. § 9 18oo + Notes.
- .9 -
s: >
11 85 5, 5 P. W. 40° 178 || Both yellow. Very unsteady.
I 186 6, 6% -mº 41 181 | Good circumstances.
1187 6, 6 ºmºe 42° 14′o Pos. pretty good; Dist, tolerable.
II 88 6, 6 sms * I 73 | Sometimes well seen.
I 189 Pr. Cr. 43' 181 | At times well seen. Obs, good.
II 9o 6, 6 -º-º: ’258 || Air greatly disturbed.
1191 6, 6} | Sph. Cr. 48: 143 | The single distance was observed on each side of zero.
II 92 - *º 53’ I 59 || A new arrangement of the micrometer. Scale of dist, uncertain.
I 193 © º P. W. 54.075 | Sadly unsteady and softly defined.
I 194 | 8, Io *- 48°244 P. viii. 13. A., reddish ; B, purplish 3 Unsteady and diffused.
I Ig 5 6, 6–H * 4o. 152 p, Cancri, Very fine star, occasionally well seen.
I 196 6-7, 6-8 *= 54'09 I | Both greenish white. Elegant object. Obs, excellent.
1197 || 6-7, 6'8 -º-, 154 Excellent views between long and severe shivering fits.
1198 || 7%, 8 --- 4o. 152 v. Caneri. Disks diffused.
I IQ9 gº tº * --> 41'o64 || Vision very bad, though the night appears splendid.
Izoo 7, 7} . tºmº 2 I 2 Often pretty well seen.
Izo I 7, 7% -*ºs '324 | The star is in wretched plight.
I 2 O2 §, 8 Pr. Cr • I 6 Both white. Angles observed on each side of zero, but the distance with
7#3 • * | 43' 195 a zero correction. d d l e A
+. 8 * tº A zero correction to the distances, and computed angular correction. A,
I 203 7#, * I79 pale yellow ; B, blue. y -
1204 || 6%, 7 P. W. 48:160 | A fine star, but unsteady.
I 205 6}, 7 -º-º: ‘247 Sometimes well seen, but twirls greatly. A, yellowish ; B, purplish.
1206 || 6, 7 *— 5 I'32 I Both yellow. Well seen and not very unsteady.
| 1207 tº º * 54°o75 Hazy and unsteady.
1208 || 9, Io *-i- 41.327 | * 1263. Faint and unsteady. Difficult in distance,
- 2
1209 || 8°o, 8'5 -* 54'091 Obs, good.
I 2 IO - 176 | Well seen in general, and pretty steady. Obs, very good,
I 2 I I 4, 8 * 40’044 Hydrae. Indifferent circumstances.
I 2 I 2 4, Io -- 142 | Vision excessively bad.
I 2 I 3 || 4, Io *= * I S2 Circumstances very bad.
I 2 I 4. 4, I O - • 168 A, yellow ; B, blue.
I 2 I 5 || 4, IO * 173 || Obs. moderately good.
Royal Astron, Soc, Vol. XXXV. . . . . . . . * *
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Micrometrical Measurements of Double Stars.
2O3

wi 1.
3 $8
E. # Epoch
No. § 9 I8oo + Notes.
.9
> >
1216 tº P. W. 4o 186 || Bad night.
1217 e tº-º 293 || Circumstances excessively bad.
| 12 18 || 4, 9 º-sº "316 || With my own micrometer. Air good.
I 2 I 9 || 4, 9 --> '321 | Same micrometer. Stars excessively unsteady and ill defined.
I 22O || 4, 9 - 41'oZ2
I 22 I 4, 9 tº-mº *183 || A, yellow; B, blue. Admirably defined, and usually very steady.
I 222 4, 9 - ‘2O3 A, yellow; B, blue.
I 2.23 || 4, 8 - 225 | Bad definition. Clouded over.
I 2.24 || 4, 9 -- ‘29O Obs, good.
I 2.25 4, 9 -> 42° 14′o Ill defined. Obs. tolerable.
1226 4, 9 &- • 261 || Tolerably good views occasionally. p
J 227 || 4, 8 Pr. Cr. 43' 162 Assumed zero of dist, and angular correction computed.
I 2.28 4, 8 -: 179 |Assumed zero of dist, and computed angular correction.
I 2.29 4, 9 -sº • 28o | Assumed zero of dist. and computed angular correction.
we º A, deep yellow ; B, deep green-blue; lovely object, but tremulous and
1230|| 34, 7 || Sph. Cr. 48.143 || “..." ºp 9 vely op)
I 231 || 33, 8 P. W. ‘247 || A, yellow; B, green. Sadly unsteady.
I 232 || 33, 8 - 49.283 || A, yellow; B, blue. Usually ill defined and very unsteady.
I 233 e - tº- “337 || Daylight. Confused and unsteady; little good to be done.
I 234 || 3:#, 8 * 51.321 | A, golden; B, blue. Air not very good.
I 235 7, 7 tº- 4o' I 49 || Lyncis 130 B. Pos, good; Dist. poor.
1236 || 7-1, 7.4 *º-sº 54'o91 | Both white. An elegant object very well seen.
1237 7, 8 *- 48° 165 P. v1.11, 200. At times well seen.
1238 | 73, 8 - ‘I g2 Ill defined and unsteady, between driving clouds which soon covered the
/ 22 sky.
I 239 i- 52'252 || Greatly diffused and very unsteady.
I 24o 7°4, 7-9 - 54: 167 | Both white. Sometimes pretty well seen.
I 24. I 5, Io *-* 4 I ‘I 84 o, Ursae Maj. A., yellow ; B, light blue.
1242 6, 9% - ‘zo 5 || A, yellow ; B, blue. Colours decided.
I 24.3 4á, 9 - 48°247 A, yellow ; B, lilac. At times well seen.
- º A, yellow ; B, reddish. With Alvan Clark's 73-in. object-glass. The
1244, 5, 8 || 54830 |*|†,”
I 245 e Sph. Cr. ‘844 | Same telescope. Disks diffused. Air bad.
1246 | 73, 8 P. W. 41.209 || Cancri 194 B. Both white. Excessively unsteady.
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Micrometrical Measurements of Double Stars.
2O5

E # Epoch -
No. # É 18oo + Notes.
>. >
I 247 || 7, 7} | P. W. 41-212 || Generally well seen. Coarse and easy.
1248 || 6%, 6% *= 42’ I 5 I | Both very white,
1249 || 6%, 6% º 187 | Pery white stars. Badly defined, and very unsteady.
I 25o 7#, 8 *=sº 261 | Both pale yellow. Occasionally well seen.
125 I 7, 7} | Pr. Cr. |43°168 | Pretty well seen. Assumed zero of dist, and computed angular correction.
1252 | 7%, 8 ºmºsºs *209 | Assumed zero of dist. and calculated angular correction.
1253 7, 7 # º ’272 B. º cloudy. Assumed zero of dist. and computed angular
1254 || 7-1, 7.4 | P. W. 54'091 | Both very white. A fine star well seen.
I 255 7°2, 7.4 tºº ‘I 54 Generally well seen.
1256 73, 8 º 48.25o ox 197. A, very white; B, white. Usually well seen.
I 257 7#, 9 *E*- 5 I’277 || Hazy, and ) very bright; mags. too small.
1258 8+, 8 tº- 4 I'249 || > 1321. Both light yellow. The angle set down s. p.
I 259 || 7-H, 7 *º- "29 I | The angle set down s. p. .
126o 7% +, 7% ſºme *327 | Bad vision. The angle set down s. p.
1261 || 7-i-, 7 gºssº 42°187 | Excessively bad definition. The position set down s. p.
I 262 7%, 7% + *=== 48°285 | The stars placed vertically by prism.
1263 || 7, 7-- mº- 4. I'2O I | Lyncis 157 B. Both white. Generally very meat and beautiful.
1264 || 7, 7-1- *sº "2 I 2 | Steady and well defined.
1265 | 7, 7% * } ‘285 || Occasionally pretty well seen.
1266 7, 73. * 42° 162 | Both yellow. Obs. pretty good.
1267 7, 7% * =sº .261 | Both white. , Vision is far from good, though the sky is apparently
magnificent. ...,
1268 || 7, 7% wº ’285 | White stars. Occasional good views.
I 269 6}, 7 Pr. Cr. 43' I 68 || Stars white. Assumed zero of dist, and calculated angular correction.
1270 || 7, 7} | P. W. 48:160 | Both very white.
I 27 I 7, 7} — 48° 17'o Both very white. Clouds and haze very troublesome.
I 272 7, 7 + ſº-º-º-º-º: 173 | Very white stars. Excellent vision occasionally.
I 273 || 7, 7% * -ºs- 49.264 | Both light yellow.
I 274 || 6%, 7 gº 52'225 | Pale yellow stars. Occasionally well seen, but very unsteady.
1275 {-º-º-º- 54' I 32 Excessively diffused; hazy and faint.
1276 * ==º 16o wºº at times, and commodiously observed in an improved observing-
1277 6'9, 7. I * 167 | Well seen during obs. of position; less so during obs. of dist.
206 Rev. W. R. DAWEs, Catalogue of


..., |Big B.A. |NPPI ..., | #| # § # # #|
No. Designation. ; 3. * | 1850. 1850. Position. i : £ à i §: &
ſº | h m s] o / O - J/ * = sºm-º n = .
1278 || Lyncis 157 B | 1338|| 9 || 1 35| 5 || 1 || 134°51 || 5 || 27 | 561 || 1707 || 4 || 18 || 561
razo (continued) .. 13391 || 5 || 33 || 412 | 1533 || 4 || 27 || 412
128o Anonyma [200]| 9 14 31|| 37 48 || 338°52 || 5 || 3o 353 || 1:564 || 4 || 19 || 353
1281 | Anonyma | 1355 || 9 19 23|83 7| 325-80 || 5 || 36|| 353 || 2:771 || 6 || 25 | 353
I 282 ... I ... I 32696 || 5 || 25 | 353 || 2:534 || 4 | 20 | 353
I 283 || @ Leonis 1356 9 zo 25 8o 18 || 354-48 || 1 || 2 | 6oo
1284 3oo'60 || 3 || 5 || 6oo
1285 299.95 || 2 || 5 §. o'45 est] . .
1286 347 II | 3 || 9 || 353 o'6 est] . . | 2 || 353
1287 © tº tº º 345'77 || 3 || 17 | 561 o'537 || 4 || 12 || 561
1288 | Hydrae 134 B | 1365 || 9 2 3 47|87 53 | I 59' 15 || 2 || 7 || 268 || 3:393 || 6 || 2 | | 269
I 289 © tº •º º 159'52 || 4 || 32 || 467 || 3:263 Io 82 467
1290 | p Ursae Maj. [208]| 9 41 52' 35 14|| 25'89 || 5 | 18 561 o'4 est] . . . 2 561
8 Sextantis tº e
I 29 I (ºr C. 5 ſº 9 45 5| 97 24 || 5o 14 || 5 || 17 | 353 o'6 est . . | 2 || 353
I 292 tº gº e ‘º e 5 I ‘29 || 3 || 9 || 4 I 2 || O'5 est] . . | 2 || 4 I 2
1293 || Anonyma | 1399 || 9 48 45|69 32 || 175°26 || 5 || 36 || 353 |29'940 || 4 || 32 || 353
I 294. tº º wº I 74°59 || 3 || 2 I | 353 || 3 o'o I 5 || 4 || 24 || 353
1295 || Anonyma. [2 13]|Io 4 38 61 5o | I 17:45 || 3 || Io 353 || I'o67 || 4 || 1 || || 353
1296 || 39 Leonis [523]|1o 8 59 66 9| 295'55 || 2 || 6 || 97 || 6’ est . . | 2 | 97
1297 | y Leonis || 1424 |1o 11 42 69 24 || IoS-25 || 5 | 19 || 320 || 2:925 || 6 || 28 || 320
1298 I off-og | 5 || 3o 360 || 2:750 || 6 || 28 || 360
I 299 I of '27 || 5 || 1 I | 490
- I 3oo I off 33 || 5 || 28 || 420 || 2:832 || 4 || 15 || 420
| 1301 Ioé Io || 7 || 29 || 6oo
I 3O2 tº gº Ioy 37 || 6 || 19 || 420
I 3O3 Ioë-25 || 6 || 5o 420 || 2:719 || 4 || 29 || 420
I 3O4. I off-67 || 3 | I 5 || 35o | 2'913 || 3 || 14 || 35o
I 3OS I of 73 || 5 || 32 || 35o || 2:823 || 5 || 32 || 35o
1306 Io8-62 || 5 || 38 || 572 || 2:702 || 6 || 45 572
I 307 tº ſº tº º 2734 ſo 86 || 475
1308 I off'72 || 3 || 28 || 690 2'934 || 4 || 34 || 690
|
Micrometrical Measurements of Double Stars.
207
- # # Epoch
No. 5, 9 I 8oo + Notes.
CS .9
> . F.
1278 P. W. 5 4.26o | With Alvam Clark’s 73-in. object-glass. Admirably seen, but extremely
e u if G unsteady.
1279 tº - ºmºsºma ’268 || Same telescope. Vision indifferent.
128o 7, 8% ſº 48°285 | O 2 zoo. A, yellow ; B, blue; good colours; elegant object.
I 281 7%, 7% gº 48°244 2 1355. Both white. Became very hazy.
1282 8.2, 8:3 gºmº 54'O75 | Neat star; but often diffused and unsteady.
1283 © o gººms 41-183 | * Leonis. So slightly elongated as to be exceedingly doubtful. Very fine
night.
1284 — 42'266 | When best seen the star was thought to be slightly elongated.
I 285 | 64, 6% | Pr. Cr. 43' 176 | Calculated angular correction of pos.
I 286 e P. W. 54° 168 A decided elongation, but never notched. Night unfavourable.
7 | 6. - ºmºsº o With Alvan Clark's 73-in. object-glass. Almost divided; a dark line
1287 4, 7'2 266 across the deeply notched disk. y
1288 7, 8% *- 48°242 | Hydra, 134 B. Bad night,
I 289 | 73, 8 gººmsºmºs 249 || A, white; B, purplish 2 Admirably defined and pretty steady.
- emmºms o © Urs. Maj. With Alvan Clark's 73-in. object-glass. The elongation is
1290 5%, 5% 54°282 | very obvious, but the air is not good enough.
I 29 I 6°o, 6' 5 º 54." I 68 || 8 Seatantis. Discovered to be double by Alvan Clark. A decided
- elongation, scarcely notched.
I 292 ſº * •266 || With Alvan Clark’s 73-in. object-glass. Air not good enough. A good
notched elongation, but never divided.
I 293 || 7}, 8 wºme 5 I:28o × 1399. Unsteady and diffused. Light hazy clouds and bright Moon near.
I 294 || 7-2, 8. 1. º '3 I 8 || Both white, Very unsteady.
1295 8, Io * 49.274 ox 213. Very delicate, and rather difficult. At times well seen.
* º 39 Leonis. With Alvan Clark’s 73-in. object-glass. Very delicate and
1296 || 6, 1 I 54°283 pretty; bears a little illumination.
I 297 || 3, 4 ---> 40°277 y Leonis. The stars are neither steady nor sharply defined.
1298 3, 4 tº- "29 I Occasional good views. º:
1299 * * 296 | Poor circumstances.
I 3oo 3, 3% ºmºsºme 4. I*2O3 Both orange.
I 3o I 3, 4. * 321 | A, golden; B, paler yellow.
I 3oz 24, 3 *- 42.321 | Golden. Seldom separated; bad night; the dist. cannot be measured.
I 303 24, 3 * 337 | Both reddish yellow. Daylight. At times well seen.
1304 || 2:#, 3 Pr. Cr'. 43' I 62 | Both deep yellow. Assumed zero of dist. and calculated angular correction.
º A, yellow; B, purplish yellow. Assumed zero of dist, and calculated
1305 || 23, 4 *=- 305 angular correction. -
I 3oé 24, 3% P. W. 47.231 Both yellow. With perforated whole aperture.
1307| 24, 4 Sph. Cr. ‘296 Exquisitely defined, and almost perfectly steady. The half dist. observed.
1308 P. W. 342 Daylight. Definition at times perfect, and steadiness nearly so.
2O8 Rev. W. R. DAWEs, Catalogue of


, ºf # . . ;
# 3 || R.A. N.P.D. #| # § # #| # §
No. Designation. ; % * | 1850. 1850. Position. ; ; & É ; ; &
S. à à
13 og y Leonis 1424 18 iſ 42 65 24 10657 5 || 33 | 184 2.893 6 || 4:3 | I 84
I 3 ſo (continued) N I of 40 || 2 | 13 78o e e tº e
I 3 II Io9'27 | 5 || 4o 467 || 2:785 || 6 || 35 | 467
I 3 ſ 2 Ioz'92 || 5 || 37 || 467 || 2:939 || 4 || 35 | 467
I 3 I 3 I o8'50 | 3 | 27 | 78o || 2:809 || 4 || 4o 78o
I 3 I 4 Io8'27 | 5 || 3 || || 467 || 2:729 || 4 || 2 || || 467
I 3 I 5 Io9' 18 || 5 || 4o 78o || 2:844 || 4 || 32 78o
1316 I o8'35 | 5 || 41 || 5oo || 2:784 || 6 || 5 I 5oo
I 3 I 7 Io9'32 || 5 || 32 5oo 2'834 || 6 || 4o 5oo
1318 Io9'97 || 5 || 43 860 || 2:859 || 6 || 54 86o
I 3 I 9 tº º tº ſº * . Io9'89 || 5 || 35 | 86o 2-841 || 6 || 44 860
Leonis 145 B -> &
*3°| A & B 1426 |Io 12 41|82 49 || 259. Io || 6 || 20 | 3oo o'7 I | 2 || 3 Oo
I 32 I º º 255.70 || 6 || 22 || 3oo o°75 I | 5 || 3 Oo
I 322 258.33 || 6 || 27 | 3oo o'7 est. . . . . .
I 323 tº wº 263-28 || 5 || 19 || 353 || O'885 || 4 || 8 || 353
I 324 A : * & C 9°25 I | 4 || 3oo º e
I 325 tº e 9'39 || 5 || 22 || 353 || 7-632 || 4 || 20 | 353
1326|| Anonyma | 1.429 |Io 16 42 64 37 || 266-62 || 2 | Io 353 || 1:334 Io 45 353
I 327 265-62 || 5 || 3 || || 353 | 1.477 || 4 || 16 || 353
1328 e - tº e. 265-68 || 5 || 35 | 353 || 1:376 || 6 || 3o 353
1329 P. x. 85 [220]|Io 2 I 15||79 5 || 57 13 || 3 || 20 || 467 || 1:370 || 4 || 2 || || 467
1330 Anonyma | 1439 |Io 2 I 53 68 26 || 129°o7 || 5 || 8 || 360
1331 | Anonyma | 1.442 |Io 23 43| 67 12 154-62 || 2 | 16 || 353 || 13:291 || 3 || 22 353
I 332 e - e 154'66 || 5 || 37 353 |13.32 I | 4 || 24 353
1333 || 49 Leonis | 1.450 |Io 27 Io 8o 35 | 155°52 || 5 | 16 || 330 || 2:552 || 4 || 13 || 330
I 334 I 55"33 || 3 | I 5 278 |, 2’604 || 4 || 24 278
1335 | Anonyma | 1.457 |Io 3o 54 83 29 303: 18 || 3 || 3o 467 o’953 || 6 || 2 I 467
1336 • ‘º tº e • 3o I '76 || 3 || 13 || 412 o'871 || 4 || 1 || || 412
1337 || 35 Sextantis 1466 |io 35 34|84 28| 240°37 || 5 || 25 | 600 | 6.913 || 4 | 18 6oo
1338 239'92 || 3 || 1 o 3oo | 6’813 || 6 | 18 3oo
I 339 23990 || 3 | 15 420 | 6′741 || 2 || | | | 420
Micrometrical Measurements of Double Stars.
209
§ §
£ # Epoch
No. § g 18oo + Notes.
cº .3
> >
1309|| 3, 4 || Sph. Cr. 48: 127 | A, yellow ; B, greenish yellow. Air disturbed; aperture reduced to
3’8 in.
13 Io P. W. *16o | Clouded completely. " .
I31 I | 2, 3% ºmsº 173 || Both reddish yellow. Very unsteady, but occasionally well seen.
I 312 2, 3} *- ‘22O | Pretty good circumstances.
I 3 I 3 || 2, 4. sºme- '427 Daylight. Admirably seen.
I 3 I 4. tº- 49-261 | Unsteady and flashy.
I 3 I 5 tºmºe 5 I*3 I 3 Beautifully seen, but unsteady.
I 316 sºmmº 52'424 | Sunshine. At times pretty steady, and admirably defined.
1317 tº- 54'372 With Alvan Clark's 73-inch object-glass. Good views at times.
I 3 18 Eº- • 28 Same telescope, Sunshine. Splendidly seen ; round spangles with a
3 389 faint ring round each.
I 319 º *- “4 o'S | Same telescope. At times admirably seen.
! *- º Leonis 145 B ; A and B. Disks just separated. Distance by compari-
1320 | 8, 8% 42'275 son with an opening of the threads = 1°o.
I 32 I | 8 8% *- ’285 Both white. Divided by glimpses. Dist. a very careful comparison
2 with an opening of the threads = 1°o.
I 322 8, 8% *- 337 | Both white. Separated by glimpses; but they require a higher power
•ºf than the air will bear.
I 323 7-6, 8:o smºº 54' I 60 | By glimpses just separated. Air not good enough.
I 324 || 8, Io; – |42.275 | *** and c. clouded.
7-6, 8. O 2. e
I 325 I O'O *- 54:160 | Not very difficult.
1326|| 8%, 8% -º- 48' 242 | x 1429. Both white. Delicate and neat.
1327 8%, 8% mº- 49.321 | Extremely delicate, but occasionally very distinctly seen.
1328 8-6 , 8.8 sºmºsºmº 5 I'32 I Pale stars, bluish white, and do not bear a good illumination.
1329 || 7%, 9 *- 49.274 P. x. 85. A, white. Very unsteady.
1330 9 9% *- 4O' 294 || 2 1439. Stars separable by glimpses only.
I 33 I 7, 7% * 48.242 | x 1442. Both white. Obs, broken off by clouds.
I 332 7' 5, 8°o * 51.318 . At times well seen.
I 333 6, 9 * 40.321 49 Leonis. Obs. with my own micrometer.
I 334 tº-ºm- 54-280 || With Alvan Clark's 73-in, object-glass. Pretty good circumstances.
1335 | 73, 83 *- 49.274 | x 1457. Both very white. Very pretty object, but sadly unsteady.
1336 8'2, 9°o *º- 54′269 With Alvan Clark's 73-in, object-glass. Unfavourable.
I 337 6, 7 *- 4.1.187 35 Sewtantis. At times well defined, but unsteady.
1338 6, 7 sº 209 || Pos, tolerable; dist, very indifferent.
1339| 6}, 7 tº- ‘225 | Pos. pretty good; dist, middling.
Royal ASTRON. Soc. Vol. XXXV.
•2 IO Rev. W. R. DAWEs, Catalogue of

; R.A. | N.P.D # # 3 § # # | 3
No. Designation. ### 1850. || 1850. | Position. ; ; # # ; ; #
*5. à a #
134o 35 Sextantis 1424 to 35"s. 8; 28 239.47 3 | 18 || 32O 6'986 6 25 | 320
I 34 I 23973 || 3 | 20 | 3oo | 6’ 618 || 4 || 29 || 3oo
I 342 23990 || 3 | 16 || 320 | 6′790 || 6 || 36 || 320
I 343 239-25 || 4 || 19 || 35o || 6-8 II || 4 || 19 || 35o
I 344. 239'20 || 3 || 22 | 185 || 6′761 || 3 || 23 185 |
1345 239-28 || 4 || 24 || 35o | 6′518 || 4 || 24 || 35o
1346 239-82 || 3 || 15 35o | 6′744 || 3 || 15 35o
I 347 239.87 || 5 || 35 | 184 || 6'874 || 6 || 3o 184
I 348 240.70 || 3 || 26 || 467 || 6-678 || 4 || 38 467
I 349 239'92 || 3 | 19 268 || 6′514 || 6 || 4o 268
I 35o e e ... || 239-84 || 3 || 17 || 412 || 6′491 || 6 || 32 || 412
1351 | Anonyma [229]|Io 39 22|48 6|| 347:35 | 5 || 33 || 467 o'925 || 4 || 18 || 416
I 352 | Anonyma | 1.478 |Io 42 55| 64 45 349'O4 || 5 || 17 | 467 || 8'502 || 4 || 8 {:}}
1353 54 Leonis | 1.487 |Io 47 29. 64 27 | I o4.os | 5 || 1 5 || 360 || 6’291 || 4 || 6 || 360
I 354. Io9'58 || 3 | 12 || 330 || 6’ 175 || 2 || 9 || 330
I 355 Io2’65 || 3 || 22 || 353 || 5'938 || 4 || 17 | 353
I 356 Io4'47 || 5 || 35 | 467 || 6′353 || 4 || 3 || || 467
I 357 | Io376 || 5 || 38 || 353 || 6’291 || 6 || 42 | 353
I 358 - IoA'26 || 2 || 13 || 412 || 6’ 354 || 2 | 12 || 412
1359 || Anonyma | 1.5oo |Io 52 24|92 4o || 317 Io | 5 || 31 || 420 | O'909 || 6 || 34 || 420
1360 | P. XI. 9 1517 |II 5 48 69 3 || 288-92 || 5 || 13 || 33o | I'o69 || 4 || 8 || 330
I 361 . . . 283'62 || 3 || 19 || 412 || O'912 || 4 || 18 || 412
1362 Anonyma | 1521 || 1 7 18|61 37| 93-93 || 5 || 4o 268 || 3:699 || 6 || 38 268
1363 |É Ursae Major. I 523 || 1 Io Io 57 38 || 1 52'62 || 3 || 17 || 360 || 2:790 || 2 || 7 || 360
1364 I 51-67 || 5 || 19 320 - e.
1365 14997 || 5 || 41 || 360 || 2:499 || 6 || 43 || 360
1366 I 50-77 || 5 || 3 || || 360 || 2:429 || 6 || 3o 360
1367 I5o'I 3 || 5 || 25 | 33o || 2:496 || 4 | I 5 || 330
1368 I 5.1°o8 || 5 || 46 || 490 || 2:369 || 6 || 48 || 490
1369 148.72 || 5 || 42 || 420 || 2:324 || 6 || 54 || 420
1370 147.62 || 5 || 24 || 3oo 2.627 || 4 || 16 || 3oo
Micrometrical Measurements of Double Stars.
2 I I
# # Epoch
No. ‘E s 18oo + Notes.
§ .9
> >
I 34o , 7 P. W. 41 "29 I | Very unsteady.
1341 | 6%, 7 amsº 42’ I 52 Air unfavourable ; night apparently splendid.
gnt app y sp
I 342 7, 9 º "258 || Hazy and very smoky, giving a red tint to the stars.
* tº Both white. Not well seen. Assumed zero of distance, and calculated
1343| 7, 8 || Pr. Cr. 43' 17O angular correction.
I 344 6 7 ºmsº ‘209 Aperture reduced to 5% in. Stars at times tolerably seen. Assumed
2 Zero of distance and calculated angular correction.
I 345 6, 7 ſº • 28o | White stars, not well seen. Assumed zero of distance and calculated
angular correction.
1346 || 6, 7 sºr ºse '305 || Both white; neither steady nor well defined. Assumed zero of distance
and calculated angular correction.
1347 6, 7} |Sph. Cr. 48: 143 || A, 7'ed-yellow ; B, greenish-red.
1348 6, 7 P. W. 5 I’291 | A, yellow; B, paler yellow. Steady and exquisitely defined.
I 349 lºssº 54:160 || Occasional good views.
I 35o tº º ’28o | With Alvan Clark's 73-in. object-glass. Stars sadly unsteady.
I 35 I 6#, 7 tº-º-º-º: 49°274 OX 229. Both very white; neatly separated.
1352 | 8%, I 13. * 5 I'278 || > 1478. Sadly diffused, and bright moon troublesome.
I 353 5}, 8 * 4O' 294 || 54 Leonis. Circumstances excessively bad.
I 354 º º * - "3oz With my own micrometer.
I 355 || 5, — |48-170 A, straw-colour; B, bluish-white,
1356 || 4%, sºsºmeº ‘247 || A, yellow ; B, light green. At times well seen, but unsteady.
I 357 5, 7 - 51.32 I | Unsteady and flashy.
1358 tºº 54′261 | With Alvan Clark's 73-in. object-glass. Night indifferent.
I 359 || 7, 8 *E=- 41' 204 || > 1.5oo. Both white. Usually well seen.
1360 | 8, 8 *=º 4o 296 | P. XI. 9. With my own micrometer. Star excessively difficult.
e *== G With Alvam Clark's 73-in. object-glass. At times meatly separated, but
1361 | 73, 8 54. 269 requires a better night. - -
I 362 7, 7% -º-º- 48°242 | X 1521. Both very white ; usually well seen.
1363 || 5, 5} tº-º-º-º: 40°268 # Ursae Majoris. Bad vision.
I 36 4 || 5, 5% * ‘271 Excessively bad night; the stars are frequently inseparable.
1365 5, 5 sº- • 288 || Well defined and steady.
I 366 || 5, 5% * "29 I Occasional good views.
1367 5, 53 *=º '302 | Very unsteady and confused. With my own micrometer.
I 368 || 5, 5} * .316 || Air admirably tranquil. With my own micrometer.
1369| 43, 5 tº ººgº 4.1.201 | Both white. Almost perfectly steady and admirably defined.
I 370 || 4%, 4% * • 206 | White stars. Circumstances not good.
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Micrometrical Measurements of Double Stars.
213
E # Epoch
No. 5, 9 18oo + Notes.
ows .9
> >
I 371 || 4% 2 4% P. W. 41-212 | Stars furred and very unsteady.
1372 4%, 4% * *228 | No measures of distance can be obtained.
1373 || 4%, 5 —, 42’ I 5 I | Occasional good views, but there is some twirling.
I 374 || 4, 4% *mºsº 266 | Both yellow. Occasionally well seen.
1375 || 44, 4% $º ‘287 | Both light yellow. Very unsteady, with transient good views.
1376 || 4:3, 5 * '32 I | Both light yellow. Vision is far from good.
1377 || 4:3, 5 Pr. Cr. 43°209 | Both pale yellow. Vision indifferent. Aperture 53 in. in use.
I 378 || 4%, 5 * ‘258 | Transient tolerable views. Assumed zero of dist, and cal. angular corr.
I 379 || 4%, 5 *mºmº .266 | Both white. Glimmering, with occasional fair views. Assumed zero of
2 distance and calculated angular correction.
I 3 8o 4}, 5 ººmsºmº ’275 Both white. Air very indifferent. Assumed zero of distance and calcu-
lated angular correction.
1381 43 y 4% tºmmºn "305 || Both white. Assumed zero of dist. and calculated angular correction.
1382 || 4%, 5 E=º "3 I 3 | Both pale yellow. Pretty well seen.
I 383 || 4%, 5 $ºmºsºs "332 | Both pale yellow. Air greatly disturbed. Aperture reduced to 4% in.
I 28 Sph. Cr. • 206 || Both light yellow. Very fine might. Pos. observed with a single thread;
384 || 4, 4% p 47°29 only half weight allowed.
1385 4, 4% P. W. *342 | Both pale yellow. Perfect definition and steadiness.
I 286 Sph. Cr. 48' I 2 Both light yellow. Zero of pos. rather uncertain, the double images
3 4, 48 p 4. 7 having been placed in line. 2
I 387 P. W. 165 | Clouded completely.
I 388 || 4, 4 + gº 173 || Both light yellow; scarcely different in size. At times perfectly well seen.
I 3 89 4, 43 tº- 22 o | Very light yellow stars. Unsteady, but sometimes well seen.
I 390 || 4:3, 5 *=º 49 253 || Tolerably seen.
I 39 43, 4} tºmºsºme 264 | Both light yellow. At times admirably seen.
I 392 tº tºº *3 I 3 || Exquisitely defined in general. Clouded suddenly.
I 393 ºn 2 * "3 2 1 Daylight. Occasionally pretty steady.
I 394 *== "337 Daylight. Definition usually exquisite ; pretty steady.
1. iº g Definition most exquisite, and steadiness nearly perfect. Clouded almost
1395 || 43, 4} 5 I ‘29 I immediately afterwards. -
1396 tº º tºmº '367 | Very unsteady; wind N.E.; cold and harsh.
wº Air unfavourable. Three angles are useless from uncertainty of the zero
I 397 3#, 4. * 52 168 point. § Inty
I 398 ſºmeº '381 Sunshine. Well seen during obs. of pos.; much less so during obs. of
tº ſº dist.
I 399 tº gº iºnºsº 5 4.261 With Alvan Clark's 7%-in, object-glass. At times well seen, but ex-
tremely unsteady.
I 4oo tº º -º-º: 266 | Same telescope. Exquisitely seen at times, with occasional strange con-
tortions. Wind S.E.
I 4o I g tºº ‘509 Sun shining brightly. Stars observed horizontally,
Same telescope.
ſo onáopoloo “saavoſ I M Aoq # Iz

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Micrometrical Measurements of Double Stars.
2 I 5

t 3 # Epoch
No. , 'E' 2 18oo + Notes.
§ .9
> s
I 4O2 8, 9 P. W. 40'296 Leonis 339 B. Circumstances very bad. Obs. with my own micrometer.
º * *==e tº With Alvan Clark's 73-in. object-glass. Well seen in general. A., pale
I403 || 7-2, 9°o 54 269 3/ellow ; B, light blue. y
I 4O4 || 5, 8 * 4O'27 I | a Leonis. A, yellow ; B, blue. Bad vision.
I 405 . . *mºs "288 Tolerably steady.
1406 tº gº * '309 || Generally pretty steady and well defined. Obs. with my own microm.
I 4O7 5, 9 *Eº-º-º: 4 I I 87 A, yellow ; B, blue. -
I408 || 5, 9 Wºmºsºg ‘209 | Very bad circumstances.
1409 || 4, 8% gººms "249 || Vision is so bad that no distances can be obtained.
141 o| 4, 8 || – ’253 | Bad definition.
I4 II | 4, 9 * ’285 | Bad vision.
I 4 I 2 4, 9 s== '302 | Pretty good circumstances.
I 4 I 3 g tº- '307 || Tolerable vision, but hazy.
I4 14 4, 7 * 42.258 | Unsteady and confused.
I 415 || 4, 8 E=ºs ’266 || A, yellow; B, purplish. Night bad, though apparently splendid.
1416 || 4, 8 tºº ‘287 | A, yellow; B, blue. Only occasionally well seen.
P, re. & Hazy. Vision is too bad ; a second measure cannot be obtained. As-
I 4 I 7 tº º Pr. Cr. 43' 176 sumed zero of dist. and calculated angular correction.
I418 4, 9 - 266 A, yellow ; B, deep blue. Assumed zero of dist, and cal. angular cor.
tºmºsºs A, yellow ; B, blue. Vision is very variable and never good. Assumed zero
1 4 I 9 || 4, 8 28o of dist. and' calculated angular correction.
I 42O || 4, 8 tºº '305 A, yellow ; B, blue. Pretty well seen at times. Assumed zero of dist.
5 and calculated angular correction.
I 42 I 4, 8 P. W. 47.272 A, yellow; B, green. Pretty steady and often admirably defined.
I422 || 4, 8 Sph. Cr. 48: 127 | A, yellow ; B, blue.
1423 || 4, 8 P. W. ‘247 A, light yellow ; B, greenish. Unsteady.
I 424 || 4, 7 § * 49°253 A, light yellow ; B, green. Well seen at times.
I 425 || 4, 7 tº-º-º-º: 337 || A, yellow; B, lilac. Air very bad.
tºmsºn * A, yellow ; B, purplish. Pretty steady, but softly defined; tempera-
1426 || 4, 8 5 I ‘294 'tire high, and air moist.
I 427 45 Gººse ‘3 I 8 || A, yellow; B, pale blue. The star moulds strangely ; wind N.E.
I 427 * 52°381 Sunshine. Not well seen.
I42O tº tº tºº 54:373 || With Alvan Clark's 73-in, object-glass. Occasional good views.
I 43 o tº O gºmº "390 Same telescope. Star well seen.
smºgº e 57 Ursae Majoris. A, light yellow ; B, deep purple ; an elegant object
I 43 I 5, 9 48:247 || 37. 9. y
I 432 * g=== '5 Io Daylight. Small star faint.
2 I 6 Rev. W. R. DAWEs, Catalogue of


, ſº º | | 3 | .
# * R.A. N.P.D. #| # # #| | | |
No. Designation. É & * | 1850, 185o. Position. ; # É # ; É &
*o. à ë
I 433 º 1543 in 20 sºla; sól 7’s |s||25 | 375 | 5%;6|| 4 || 3 ||375
1434 9o Leonis | 1552 |II 26 54. 72 22 || 2 Io'78 || 3 || 24 || 353 . . .
I 435 { * & gº tº 3'oz7 | Io 7o 467
1436| Anonyma | 1553 || 1 28 22 33 2 || 17 I-26 || 5 || 46 || 353 || 5'378 || 6 || 48 || 353
1437 || Anonyma |[241]|II 48 30 S3 44 | 12 I'88 2 5 || 353 | 1.5 est. . . I 353
I 438 tº Lº 1 17:15 || 3 || 23 || 561 || 1:449 || 4 || 3 || || 561
1439 Anonyma | 1603 || 2 o 35 33 42 81'46 || 3 || 28 353 |22:468 || 4 || 3o 353
144o Virginis 191 B, 1647 |12 22 57| 79 27 | 207'o'3 || 5 || 34 || 33o || 1:276 || 4 || 16 || 330
144 I 2 I I '88 || 3 || 14 || 353 || 1 22O || 4 || 1 || || 353
I 442 212'35 | 5 || 3 | | 467 || 1: 120 || 4 || 14 || 467
I 44-3 tº tº º 2 o'92 || 5 || 27 | 296 || 1:358 || 4 || 13 || 296
1444 Anonyma | 1663 |12 29 42 67 58 || 1 12:36 || 3 || 8 || 5oo o'908 || 2 || 4 || 5oo
1445 y Virginis | 1670 || 2 34 4. 9o 38 | 207:23 || 3 || Io 360 | 1.179 || 2 || 4 || 360
1446 - 2O7'50 || 3 | I 2 | 3oo
I 447 zo8'oz | 5 | 18 || 3oo .
1448 206.67 || 5 | 16 || 360 | 1-183 4 || 360
I 449 205-87 || 5 || 33 || 330 | I'45o || 4 || 23 || 330
I 45 o 2O4'93 || 5 || 22 || 490 || 1 ‘I 39 || 4 || 8 || 490
145 I 205'22 || 5 || 36 || 490 || 1:218 Io 56 490
I 452 2O5'33 || 5 || 20 || 490 -
I 453 2O5’ I 5 || 5 || 23 32O | I ‘2OI I O || 49 || 32O
14.54 2O4'97 || 5 || 25 32O | I 232 | Io 3o 32O
I 45.5 2O4°62 || 5 || 23 32O
1456 zo I'32 || 5 || 3o 6oo | I'508 || 4 || 12 || 6oo
1457 zo I-25 || 6 || 37 6oo | I-564 || 4 || 29 || 6oo
I 458 zo I'4o || 5 || 23 320 | I-646 || 6 || 24 || 320
I 459 19962 || 5 || 38 6oo | I'588 || 4 || 32 6oo
1460 19867 || 5 | 16 || 420
I 461 198.70 || 3 6 {:
1462 198-25 || 5 || 37 42O | I 552 || 4 || 24 42O
1463 196'o? | 6 || 35 | 42O | I '758 Io 69 || 420
Micrometrical Measurements of Double Stars.
217
wº *
# # Epoch
No. 4. § É I 8oo + Notes.
> s:
1433 || 5%, 8% P. W. 49' 337 A, yellow ; B, purple. The night is apparently superb, but vision is
not very good.
I4.34. 6, 7% gººmsmº, 5 I’28o 9o Leonis. Both stars very white. Very unsteady and much diffused.
I435 wº ‘3 I 3 | Sometimes well See Il. -
1436 || 7-2, 8°o * > 5 I-294 2 1553. White stars, well seen and pretty steady.
I 437 || 7, 9 * == 49.253 oz. 241. Clouds precluded more measures.
I438 68, 8.7 º 54′267 wº Clark's 73-in. object-glass. Beautifully defined and pretty
1439 || 7-2, 8°o sº 51.294 | x 1603. Well seen.
144o 8, 8 + sº 4O'3 IO Virginis 191 B. Good circumstances. Obs. with my own microm.
1441 || 7%, 8 tºmºsº 48°428 Both white. Air much disturbed.
1442 | 7%, 7% tº- ‘43 I | White stars. Diffused and unsteady. - .
* With Alvan Clark’s 73-in. object-glass. At times neatly defined, but
I 443 ºmºmº 54-376 very unsteady. tº
1444 || 8, 9 tºmsºmº 5**91 | x 1663. The air is not good enough.
1445 43, 4} *E* 40° 173 || y Virginis. The state of the air is too bad.
1446 || 4, 4 tº-º ’278 || Stars placed vertically.
I 447 || 4, 4. — ’283 || Vision is bad.
1448 || 4, 4 tº 286 | The air is not sufficiently favourable for good distances.
I 449 || 4, 4. lºmº "3 Io With my own micrometer.
I 4.5 O || 4, 4. ºmsºmº "411 | Same micrometer. Twilight.
I 45 I 4, 4 gº '417 | Same micrometer. Favourable.
" I 452 tº º * = ± '420 | Same micrometer.
1453 || 48, 4% smº '45o Daylight. Obs. very good.
I 454 || 4, 4 *E== '455 | Pos. tolerable; Dist, indifferent.
I 455 || 4, 4 &=== '469 | Very tremulous and ill defined.
1456 || 33, 3} tºº 4.1.181 | The vacancy between the disks = 3 or ; diameter of either star.
I 457 || 4, 4 {-º-º-º • 201 || Favourable,
14 58 || 4, 4 sº 307 | Badly defined and unsteady.
1459 || 33, 3} tºº '381 | Favourable.
1460 | 3%, 3% wº '420 | Stars seldom separated. Distance impracticable.
1461 || 3%, 3% ſº-ſº '436 Wretched vision.
1462 | 33, 33 * 517 | Stars white. Broad daylight; good vision.
1463 || 3}, 3# *mº 42.373 || Both white, Transient good views,
Roy AL ASTRON. Soc. Vol. XXXV.
F F
ſo on 5070700 “SIAAVCI I M. Aeºſ 8 Iz

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Micrometrical Measurements of Double Stars.
2 I 9

| #
No. §
>
1464 3%, 3%
1465 | 3}, 3%
1466||3}, 3%
1467 || 3}, 3%
1468 || 35, 3%
1469 || 3%, 3%
1470 | 3%, 3%
1471 3%, 3%
I 472 4, 4
1473 || 3%, 3%
I 474 || 4, 4
1475 3}, 3%
1476 || 3}, 3%
1477 | 3}, 3%
1478 || 3:#, 3%
1479 3%, 3%
I48o 3}, 3%
I 481 e º
1482
I 483 e tº
I484 ge &
I 485 | 3}, 3%
1486 || 3}, 3}
1487 3%, 3%
1488 || 3}, 3%
1489 3, 3
1490 as e
I 49 I e
| 1492 tº ſº
1493 || 33, 3%
1494 | 33, 3%
Epoch
18oo +
Pr. Cr.
P. W.
Sph. Cr.
P. W.
Sph. Cr.
P. W.
42'379
“390
'398
"4 I 4.
“4 I 9
‘433
435
‘44. I
43'299
"3o 5
3 Io
‘3 I 9
'406
'452
*4.54
‘457
*474
'474.
46.882
‘903
‘925
47' 272
"29 I
’296
"343
'394
*44. I
“474
‘479
48 I 43
173
Notes.
Bad night.
Both white. Fair circumstances; occasionally well seen.
Both yellowish white. Tolerably good circumstances.
Both yellowish white. The air became bad.
Both white. Air very bad.
Daylight. Vision very bad; wind easterly.
Sunshine. Both pale yellow. Vision good, at first but deteriorated
during observations of distance.
Air too bad for measures of distance.
Both white. Bad vision.
angular correction.
Both white. Vision excessively bad. Assumed zero of distance and
calculated angular correction.
White stars. Air too bad for satisfactory measures.
distance and calculated angular correction.
Both white. Vision is extremely bad, though the night is apparently
splendid, Assumed Zero of distance and calculated angular correction.
Both rather yellow, but the air is hazy and smoky. Assumed zero of
distance and calculated angular correction.
Daylight, Very unsteady and ill defined.
Both stars white.
Assumed zero of distance and calculated
Assumed zero of
Sun shining brightly. Good vision.
At times pretty well defined, though very unsteady.
Bright sunshine; but the air is very smoky.
On same night for comparison with the preceding, but the air is smoky
and bad.
Observations taken an hour before noon. The webs at present in the
micrometer are too thick for the excessively small disks.
Taken an hour before noon. Air much disturbed.
BARLow-lens before the micrometer to diminish the thickness of the webs.
Observations 13 hour before moon.
Both light yellow, but the air is thick. Vision is excellent.
Both light yellow. Position measured with a single thread, and allowed
half-weight. The half distance observed.
Both light yellow. Position observed with a single thread, and allowed
half weight. The half distance measured. **
Both pale yellow. Unsteady and furred.
Daylight.
Daylight. Very steady and beautifully defined.
Daylight. Well seen and pretty steady.
Daylight. Well seen at times, but not very steady.
The northern xk thought rather the smaller. Stars furred and unsteady.
The northern Sk certainly the smaller.
Very unsteady, but occasior.ally
well seen. -
22O Rev. W. R. DAWEs, Catalogue of

No. Designation. ### º º | Position. ; # : # # § :
ăg # B: ſh- ſº # §: Q-
1495 | y Virginis | 1670 1. 3. 96 38 18698 3 20 || 467 #604 4 || 15 || 467
1.96 (continued) 18o'58 || 5 || 34 || 467 || 2:639 || 4 || 29 || 467
I 497 180°77 || 5 || 38 || 467 || 2:534 || 4 || 26 || 467
I 498 18o30 || 5 || 26 || 353 || 2:579 || 4 || 22 || 353
I 499 180°37 || 5 || 44 || 467 || 2:553 Io 88 || 467
I 5oo 18o 12 || 5 || 36 || 435 || 2:699 6 || 33 || 435
I 5 or 18o'38 || 3 || 23 375 || 2:569 || 4 || 16 || 375
I 5oz. 17973 || 5 || 27 || 467 || 2:816 Io | 66 467
I 5 off 178-88 || 5 || 26 || 353 || 2:887 || 4 || 16 || 353
I SO4 I78°48 || 5 || 35 | 375 || 2:841 || 4 || 28 375
I 5 o'S 178'98 || 5 || 29 || 375 || 2:990 14 | 375
I 506 179°46 || 3 || 15 5oo e G tº gº
I 5 o'7 176'58 || 3 | 19 5oo || 2:982 || 4 || 26 5oo
I 508 176-61 || 5 || 3 || || 467 || 2:969 || 4 || 22 || 467
I 5og 17681 || 5 || 36|| 467 || 3:029 || 4 || 26 || 467
| I 5 Io 176-25 || 5 || 35 | 467 || 2:959 || 4 || 26 || 467
1 5 II 176.32 || 5 || 39 || 467 || 3:oo9 || 4 || 28 467
I 5 I 2 175°26 || 5 || 39 || 5oo || 3:025 || 4 || 25 5oo
I 5 I 3 I75°28 || 5 || 43 5oo || 3°oog | 4 || 3o 5oo
I 5 I 4. 173'86 || 5 || 35 || 303
I 5 I 5 174'o8 || 5 || 26 || 467 & © e e ] e º | * *
1 5 I 6 174:55 || 5 || 36 || 467 || 3:065 || 6 || 36 || 467
I 517 173.88 || 5 || 43 353 || 3'o65 || 6 || 46 || 353
1 5 18 17297 || 3 || 20 | 561 || 3:035 | 4 || 17 | 561
I 5 I 9 I71 '33 || 5 || 39 || 390 || 3'248 || 4 || 3 || || 390
I 520 173° 16 || 5 || 4o 5oo 3' 179 || 6 || 46 || 5oo
I 52 I I 72'63 || 7 || 4o 5oo || 3’ I 52 || 6 || 39 5oo
I 522 172°87 || 5 || 25 | 404 || 3:220 || 6 || 26 || 404
I 523 172:53 || 5 || 31 | Soo || 3:286 || 4 || 46 | Soo
1524 172-81 || 5 || 4o 860 || 3:267 || 4 || 3 || || 860
I 525 172°40 || 3 || 24 || 48o || 3: 139 || 6 || 44 || 48o
Micrometrical Measurements of Double Stars.
22 I

I 495
1496
I497
I 498
I499
I 5 od
I 5o I
. I 5 oz
I 5 of,
I 5 o4.
I 5 oš
I 506
1507
I 508
I 509
I 5 Io
I 5 II
I 512
I 513
I 5 I 4.
I 5 I 5
I 516
E # Epoch
3. É 18oo + Notes.
Gö • *4
> >
e The northern rather the smaller. Very unsteady, and seldom well
3 +, 3 P. W. 48 247 SCCI). >k ry y,
3} +, 3} wº-ººp '422 | The northern k judged to be very slightly the smaller. Favourable.
3%, 3% º-g '428 Stars equal. Daylight : favourable.
1. *- & Daylight. Unsteady, but at times well defined. The northern >k a trifle
3}+, 3} 43o the smaller. y -
3 +, 3 tº-mº "433 Daylight. Sometimes perfectly defined. The stars dance a little together,
- - but do not twirl. The northern >k is rather the smaller.
33, 3% Sph. Cr. '474 | Stars equal. Good definition. The half distance observed.
e G P. W. '490 | Sunshine. Well seen at first, but became very tremulous.
o Both light yellow. Splendid sky and bright moon. Stars well seen, but
- 2
3, 3 49°274 very unsteady. y
3, 3 + wº- ‘299 || The southern >k thought rather the smaller. Very unsteady.
3, 3 t- “4 II | Daylight. Very well defined and pretty steady.
© a us-sº *447 Unsteady and confused. Sky apparently splendid; but the wind is E.
- and very cold. Therm. only 41° 5 (June 13),
tº-sº '450 | The air is not sufficiently favourable.
1. 1 sº-g - . . The northern >k seems rather the smaller. At times well seen, but
3++, 3% 5 I:217 unsteady.
e tº º-e “4 II The northern >k thought rather the smaller. Occasional good views.
Perforated whole aperture.
© gº- *4 I 7 | Perforated whole aperture. Very unsteady.
e *- *4 I 9 || The northern >k is certainly rather the smaller.
e ºm- ‘463 Daylight. The northern sk seems rather the smaller. Well seen, and
pretty steady.
3, 3 tºmº- 52°2O I | Both pale yellow ; equal. Good views, but very unsteady.
pate y Q
3, 3 *- '424 Daylight. Admirably seen and pretty steady. Stars equal.
º Sph. Cr. 16o | The stars are equal. Splendid night.
p 53 Q p §
º P. W. “4 og Daylight. The northern + is the smaller. Clouded.
Q is ºs- *425 | The northern >k is the smaller. Well seen.
3}, 3% *- ‘43 I | Bright sunshine. Northern >k the smaller.
º tº- 54'266 With Alvan Clark’s 73-in. object-glass. Stars sometimes well seen.
º tº- • 373 || Same telescope in future. Extremely unsteady, but well seen.
assº- '381 | Stars admirably seen and pretty steady. Air thick; wind S.E.
-> *- '390 The northern >k thought rather the smaller. Very unsteady, but well seen.
Sph. Cr. '398 || Very unsteady, with occasional good views. The half distance observed.
& P. W. “4 oo | Pretty good vision.
3, 3 ºmº '409 || Admirably seen in general and pretty steady. Both very pale yellow.
& gº- ‘472 Sun shining into the observatory. Very well seen at times and pretty
I 5.18
I 5 I 9
I 520
I 52 I
1522
I 523
I 524
I 525
1 5 I 7 |
steady. Stars equal.
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* * :- wº zz £ Zz | S £5.6% 89.51
• ‘lso 5.1 ozy £9 || 9 || 24.8% 49 S I
ość | 81 | V | 8%. 1 oS9 || 41 || + | z6.9% 9951
oS 8 || 8 || 2 | 684. I oS £ | 8 £ o8.4% $ 25 I
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ość z1 | V | Z8%. 1 ość z 1 || + | £9.1% ££S I
ozy z8 || 9 || 859. I ozy o? | 9 || 46.9% zº S I
oo: 14 || 9 || 94%. I oot | 99 || 9 || zº.5% I £S I
. . . . . . oot | 6 || 8 || 48.4% o? S I
oo: z I | V | #z$. I ozy | 82 | 9 || z9.4% | 62S I
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A f S tu Ül
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3. sº. 3 ă. 3 g| | | | 'uopisod oš81 988 |z{##| "uogoujisaq on
# # |#| # # | # # ‘CI'di'N | ‘V’ſ 9 #
; so * 5. J.”
Micrometrical Measurements of Double Stars.
223


-
- E à Epoch
No. § É 18oo + Notes.
> >
1526 6}, 7} | P. W. 51.294 | x 1678. Very bright ( ; the mags, may be 3 higher.
I 527 | 7'o, 7-5 tºm- 319 || P, xII. 201, 202. Both white.
I k28 - .266 || 35 Comae Ber. A, yellow : B, purplish. Only an approximate measure.
5 5}, 8 42'2 Air not good enough. -
I 529 || 5, 8 * ‘285 | A, yellow; B, lilac. Vision not very good. A 3d k C, 8.f. of about 103 m.
I 530 6, 8 — '337 || A, yellow; B, blue. Vision far from good.
I 53 I | 5%, 7 ' -- '373 || A, yellow ; B, purple. Occasionally well seen and pretty steady.
I 532 5, 7 — ‘534 || B is blue. Daylight. Very unsteady.
& A, yellow ; B, blue. Extremely bad vision. Assumed zero of dist, and
I 533 5, 8 Pr. Cr. 43'258 'gºld. angular correction. - -
I 6 tºm- .28o | A, pale yellow ; B, blue. Night brilliant, and excessively bad. Assumed
534 6, 9 zero of dist, and calc. angular correction.
mºsºmº o A, yellow; B, blue. Assumed zero of dist, and calc. angular correction.
1535 | 6, Io 329 Štar not weli seen. -
I 536 6, 9 gº- “4 o'S A, pale yellow; B, blue. A 3d xk C, blue, Io mag. 8. f.
ſº A, yellow; B, blue. A 3d Sk C, 11 mag. Elegant object. Very unsteady,
I 537 || 7, 9 P. W. 45.5 and seldom weli seen.
I 538 * 47'324 A, light yellow; B, pale blue. Rather cloudy.
I 539 5, 8 - 48°43 I A, yellow ; B, lilac. Occasional good views.
I 54o 5, 7% tº- ‘524 A, yellow; B, blue. Air bad. * * -
- g A, yellow; B, bluish. Air pretty good during obs. of pos. ; bad during
1541 || 5%, 8 || – |49'32 I | *tj dist.” - -
I 542 5, 8 *- “335 | A, yellow; B, blue. Excessively unsteady.
I 543 e * 52° 554 || Air excessively bad, though the night looks fine.
I 544 *- 53'43 I | Unsteady and flashy.
I 545 * ‘54o Tolerable vision.
1546 — 54-376 with Alvan Clark's 73-in, object-glass. Bad night.
- gºamms e Same telescope. If the air were more favourable, this power would just
547 4oo suit the object. -
I 548 tº Q — '472 | Same telescope. Very unsteady, especially during obs, of distance.
1549 || 5, 15% *mº 48° 5 Io P. xII. 230, 232 = Camelop. 32 Hev. Both white. Very unsteady.
I 55o 5, 6 i- ‘523 Daylight.
I 55 I | 8, Io *º 40'316 | x 1690. With my own micrometer. Obs, interrupted and indifferent.
I 552 8, Io tº- 41.285 | Vision is extremely bad. - - -
I 553 | 8, Io — 321 | Vision bad.
I 554 || 7, Io * 42-163 | The large star is furred, and the small one faint.
I 555 8, Io *º- 288 || Unsteady and diffused.
1556 || 8, 1 o' | Pr. Cr. 43°313 | Usually well seen. Assumed zero of dist, and calc. angular correction.
224. Rev. W. R. DAWEs, Catalogue of


g; # # © § # +5 e
No. belºw. |}}# *... [...] roºm. || #| | | | | | #|
&c. # B | & S # B | \,
L–1 O O
I 557 łº: 1690 1. 48'3; 94 3| 14562 || 2 | to 278 || 6′o27 4 || 1 || || 278
1558 || 44 Virginis || 1704 |12 51 56| 93 o|| 53'45 || 5 || 20 | 375 | 20:436 || 4 || 1 || || 5oo
1559 || 42 ComaelSer. 1728 || 3 2 41||71 41 || 198'95 || 5 || 12 || 490 o'4est. .. 490
I 560 - 185°oo || 2 || 3 || 6oo lo'4oro-5|est. 6oo |
1561 2O4'4o || 3 || 6 || 6oo
I 562 | Single 42O
I 563 Single 6oo
1564 I 3 '83 || Io 49 || 5oo o'6est. . . . 2 || 5oo
I 565 I4°52 || 5 || 33 || 467 o°614 || 1 o 20 || 467
1566 16:21 || 7 || 25 || 658 o'638 || 4 || 8 || 658
1567 13°20 || 7 || 41 || 5oo o°634 || 6 || 18 5oo
1568 12°o3 || 3 | 20 561 o'585 || 4 || 12 || 561
I 569 12.89 || 5 || 38 | 660 o'696 || 6 || 29 | 660
| I 57o 12.87 | 5 || 4o 5oo o'572 || 6 || 3o 5oo
I 57.1 12:42 || 7 || 50 | 86o o'43o || 6 || 34 || 86o
I 572 te & I 1-93 || 5 || 29 || 48o o'493 || 6 | 18 || 48o
1573 |& Ursae Major. 1744|13 17 53|34 17| 148 oz || 5 || 39 || 375 ||14-165 || 4 || 2 || 375
1574 || Anonyma [266]|13 21 4|73 29 || 325-30 || 3 || 14 || 322 o e
I 575 e e e e 327. 16 s 18 || 412 || I'oZ6 || 4 || 22 || 412
1576 P. XIII. 127 1757 || 3 26 38 89 33 || 37-28 || 3 | 18 420 | I '783 || 6 || 32 420
I 577 37'52 || 6 || 25 {:} I'491 || 6 || 18 || 3oo
1578 © e 38°35 | 6 || 23 || 3oo
I 579 © e tº e tº º 39'Io || 6 || 38 3oo * -
158o 81 Virginis 1763 |13 29 44|97 6 || 41'63 || 6 || 3o 420 2773 || 6 || 3o 420
1581 || 25 Can. Ven. 1768 |13 3o 47 52 56 || 65'57 || 3 || 7 || 420 io'85 est. . . . . . . 420
1582 tº º - 67-77 || 3 || 1 1 || 420 o'993 || 4 || 8 || 420
I 583 68°35 | 6 || 23 420 o'9est. . . . . . . 420
I 584 69'85 || 4 || 8 || 35o o'942 || 4 || 8 || 35o
1585 sº 4 || 1 || || 35o | I I oë | 4 || 9 || 35o
1586 (ºft º o #. o'42 ... 561
1587 32" I 5 || 2 || 2 {:} o:3 est. . . . . I 86o
Micrometrical Measurements of Double Stars.
225
E # Epoch
No. 5, 2 18oo + Notes.
cº; .9
> s
I 557 P. W. ‘26 With Alvan Clark's 73-in. object-glass. Bad night; bright moon near.
54°209 Ject-g § §
I 5 58 6 ł, I I tºmme 51.277 || 44 Virginis. Air unfavouable, and the bright moon is near.
I 559 *===e 4o'3 Io 42 Comae Ber. With my own microm. With 330, disk elongated; with
490 more decidedly so. Sometimes slightly notched.
1560 *ms 41 181 | By best glimpses a pretty decided elongation is perceivable. Air not
favourable. g
I 561 &mmº '381 | Only elongated; scarcely notched at best.
I 562 gº 42°534 Examined for half an hour by daylight. No elongation perceivable. Air
- not good. -
I 563 5 &===s 43' 4.54 No elongation perceivable during long examination by daylight with
powers 3oo, 420, and 6oo. Definition sometimes excellent.
I 564 || 6-i-, 6 ſº 52'2OI | Both pale yellow, very nearly equal; southern k thought rather the smaller.
I 565 &=º 53° 526 By daylight. Usually well seen, and pretty steady. A deeply notched
elongation.
I 5 66 wºmºmº 535 | Very tremulous, but occasionally well defined.
I 567 wº ‘54o | Sunshine : pretty steady; a notched elongation.
68 wº e With Alvan Clark’s 73-in. object-glass. Stars in loose contact, with a
I 5 54′267 decided dark line between the disks.
I 569 *g '379 | Same telescope. Disks well divided when best seen.
I 57o *smº '381 Same tel. Disks in loose contact, a dark line being visible between them.
I 57 I *=3 '409 Same tel. Just divided; at times beautifully shown.
I 572 == '472 | Same tel. Broad daylight, 7' 20" m.t. Disks quite divided.
1573 || 23, 4 smºº 48-49 I & Ursae Majoris. Very unsteady and furred.
I 574 || 7%, 7% tº-º-º: 47:337 o X 266. Both white. Clouded over.
1575 || 7-6, 8, 1 *º 54'272 | With Alvan Clark’s 73-in. object-glass. At times neatly defined.
I 576 || 8, 9 &ºm=º 42'373 | P. XIII. 127. Both white. Air not very good.
I 577 || 7%, 8% *sº '398 || Both white. Air not good enough.
I 578 8, 9 — , 43°452 | Not well seen, and extremely unsteady.
I 579 | 73, 8 gº '455 A, yellow; B, paler yellow. Vision not very good.
I 58o 8, 8+ tºº 42°373 || 81 Virginis. Both white. Occasional tolerable views.
1581 6, 8 ºmmºns, 42'288 25 Canum Ven. (= Can. Ven. 181 B). A, yellow; B, blue. Badly seen.
1582 5, 8 *mº '338 || A, yellow ; B, blue. Air not good enough.
1583 6, 8 * 379 || A, pale yellow; B, purplish. Air not good; the disks are seldom separated.
I 584 5}, 8 ' | Pr. Cr. 43°343 Air greatly disturbed.
1585 5%, 9 &ºm=g 362 A, white. Air bad; small star rarely visible.
tº With Alvan Clark’s 73-in. object-glass. After long looking, I think there
1586 P. W. 54.267 is a little pale blue wen n.f. Night fine.
I 587 *==ss ‘373 Same telescope. I sometimes fancy there is a little projection in the
direction measured.
ROYAL ASTRON, SOC, Vol. XXXV.
G. G.
226 . Rev. W. R. DAWEs, Catalogue of

: # +s § # +s
No. Designation. # i. - º | Position. ; # : # i § :
*S. É a ſº # B: P-
h m s! o , O OO) ſº *== i = 1 =s*
1588 25 Can. Ven. 1768|13 30 47|52 56 35-58 || 5 || 14 {:} o' 35 est. . . . I | 86o
1589 endº tº º tº º 38°47 || 5 8 5oo o°4 est. . . I 5oo
I 590 dºs} ... 13 3o 56 6o 54 19699 3 6 268 l o'8 est. . I 467
I 591 | P. XIII. I 56 1770 || 3 31 42|38 31 || 1 1872 || 5 || 24 || 375 | I'607 || 4 || 20 375
| 1592 . . . . 1922 || 5 || 33 || 375 || 1:850 || 4 || 3o 375
1593 | 84 Virginis 1777 || 3 35 32| 85 42 233'58 || 5 || 23 3oo || 3:562 || 4 || 15 3oo
I 594 232’63 || 3 || 9 || 320 || 3'989 || 4 || 12 || 320
I 595 233'5o || 3 | I 5 || 32O || 3-638 || 4 || 8 || 32O
1596 tº ſº we & tº ſº 23 1:78 || 3 || 16 || 35o || 3:608 || 3 || 16 || 35o
1597 Anonyma. 1781 || 3 38 36|| 84 8 || 238'50 | 6 | 18 3oo | I 249 || 4 || 8 || 3oo
I 598 tº ſº tº tº 238.82 || 3 | I 5 || 3oo | I 169 || 4 || 12 || 3oo
1599 || T Boötis [27o]|13 4o 8|71 48 || 349-40 || 3 || 13 78o |Io'og7 || 2 || 5 || 78o
16oo tº tº tº e tº & 349-30 || 5 || 14 | 1.5o | 9°356 || 2 || 4 || 150
1601 | Boötis 76 B | 1804 ||14 15 68 5 | 19°oS | 3 || 13 || 3oo || 4-635 | 4 || 18 || 3oo
1602 1860 5 | 1.4 185
1603 18-25 || 5 || 1 I | 18.5
1604 1963 || 6 || 14 || 3oo
1605 . 1967 || 6 || 15 || 3oo tº .
16oë I 9°50 I 5 || 35o || 4 162 | 1 5 || 35o
1607 tº º 1995 || 3 || 22 || 353 || 4:369 || 4 || 28 || 353
1608 || Anonyma | 1813 || 4 5 54|83 54 || 19275 || 3 || 9 || 320 || 4917 | 6 || 18 32O
1609 19180 || 5 | 18 185 tº º
1610 191'90 || 6 || 38 || 420 || 4'881 || 4 || 24 || 3oo
161 I 192'55 || 6 || 36 || 3oo || 5°o81 || 4 || 19 || 3oo
1612 192'47 || 6 || 3o 3oo || 4'972 || 6 || 17 | 3oo
1613 192°52 || 6 || 32 || 3oo || 4'955 . . 4 | 12 || 3oo
1614 192.87 || 6 || 14 || 3oo || 4'889 || 4 || 14 || 3oo
1615 192-68 || 2 || 6 | 185 || 4.725 || 2 || 6 || 185
1616 tº ſº 194-25 || 5 || 26 || 185 || 4'867 || 5 || 25 | 185
1617 | Anonyma | 1816 || 4 7 14 6o 1 1 || 79-72 || 5 || 2 | | 490 || 1:612 || 4 || 13 || 490
1618 78'58 || 3 | 12 || 420 || 1:659 || 6 || 25 || 420
Micrometrical Measurements of Double Stars.
227

No.
I 589
I 590
159.
1592
I 593
I 594
I 595
I 596
1597
I 598
I 599
16oo
1601
1602
1603
1604
1605
I 6oë
1607
1609
161 o
161 I
1612
1613
1614
1615
1616
1617
1618
1588 |
1608.
o, *
.3 $8
E. # Epoch
§ É I 8oo + Notes.
> §
ſº tº P. W. 54'4oo | Same telescope. A slight projection in the n.f quadrant.
t-sº * & O Same telescope. Sunshine. A slight projection probable, from coincidence
509 of individual measures.
Io, Io; -* 48-422 Smyth's Cycle, 488. Occasionally seen double, but excessively difficult.
- º P. XIII. 156. A, yellowish red; B, purplish red. Neither steady nor
1 -** -
6%, 8 48-49 I well defined." 3.
6%, 8 - '496 || A, light orange; B, brownish orange.
atº- 49 9 9/
6, 9 *-mg 41 187 | 84 Virginis. A, red.
7, Io * ‘253 || A, yellow ; B, blue.
6, 9 -º- *327 | A, yellow ; B, blue.
7, Io Pr. Cr. 43'343 A, yellowish ; B, blue. Assumed zero of dist, and calc. angular correc-
2 tion. Splendid aurora, extending to 3 and t Ophiuchi.
7%, 8 P. W. 42'285 | x 1781. Both yellowish. Air not good enough.
7%, 8 - sº "337 | Both white. Air much disturbed, though apparently very clear.
ºr Boötis. Excessively difficult. Requires high power to bring it out well, though
4}, I I} tº-sº 48°422 seen with 467, and occasionally perceived even with 2co. A good test of illu-
- minating power,
º * 54.283 With Alvan Clark’s 7%-in. object-glass. The small star bears some
illumination.
9, Io - 41.308 || Boötis 76 B. Ill defined.
8, *-sº 436 || A, yellow; B, blue. Bad vision.
8, 9 -> ‘439 || A, yellow; B, blue. Bad circumstances.
8, 9} -> 42: 370 A, white; B, purplish. Very bad vision. The dist, cannot be measured.
8, - ‘434 || A, yellow ; B, purplish. Extremely bad circumstances.
* * e Thick haze terminated the observations. Assumed zero of dist, and calc.
8, Io Pr. Cr. 43°3 I9 angular correction.
- 7}, 9 P. W. 48°43 I Unsteady. (Observed at Cranbrook.)
8}, 9 tº-sº 41-436 | x 1813. Both stars rather red.
8%, 8% i-º 439 || Vision is excessively bad.
8%, 8% -º- 42:398 || Both white.
, 8% - '420 | Both white. Vision is not very good.
9, 9} * ‘434 Very unsteady, and badly seen.
8, 9 -- ‘436 | Both white. Bad vision.
3. 8 - .442 | Vision is deplorable ; measures of this very easy star were obtained with
73, 44 difficulty. A d f d
! & • 2. Circumstances very bad; hazy; stars very dim. ssumed zero of dist.
93, Io Pr. Cr. 43 94 and calc, angular correction. **
8%, 9 *-ºs. & 362 Both white ; faint through thin cloud. Assumed zero of dist, and calc.
angular correction.
8, 8 P. W. 40-41 1 | x. 1816. With my own micrometer.
* Both white. Splendid-looking night, but the disks are soft and very
7}, 7; -mº 42.288 unsteady. 2
228 Rev. W. R. DAWEs, Catalogue of
~.
º # # | < # # # ©
No. Designation. ### º º | Position. É .# § # É .# :
%5. # B & ſº # # &
1619 Anonyms I 816 1. ; º, 66 11 7.338 6 || 46 || 420 1%30 6 || 41 420
162o (continued) , , 78.99 || 3 || 6 || 350 | 1747 || 3 || 6 || 350
1621 78-37 || 5 || 2 || || 35o | I '863 || 5 || 2 || || 35o
1622 78-93 || 3 || 1 || || 35o I '830 || 3 | 12 || 35o
1623 tº tº * @ 79.75 || 5 || 36 || 353 || I'571 |Io | 67 || 353
1624 Anonyma. 1819 |14. 7 47| 86 io || 63.73 || 3 || 1 I 420 I of 5 || 6 | 18 420
1625 61-85 || 5 || 13 || 420 | I to est. . .
1626 6o'27 || 3 || 12 || 320 o'95 est. . .
1627 58-17 | 6 || 33 || 420 || 1 oz7 || 6 || 23 || 420
1628 61: 12 || 3 | I I | 420 tº e -
1629 6o'o'7 || 3 || 8 || 3oo | I'222 || 6 || 15 3oo
1630 61'92 || 4 || 8 || 35o | I'oz2 || 4 || 8 || 35o
163 I 6o 18 || 7 || 37 3oo
I 632 * & * 9 61.70 || 6 || 38 soo I I est. . . 3oo
1633 || Boötis “f* & d ... 14 to 51 37 56|| 33-57 || 5 || 38 || 252 |38: 120 | 6 || 42 252
1634 Anonyma | 1834 ||14 14 47| 4o 48 I I I-20 | 3 8 || 490
1635 II 2°o 3 || 5 || 22 || 32O | I ‘og3 || 4 | I 2 | 32C
1636 | I I I '95 || 3 || 9 || 6oo | I 177 || 4 || 8 || 6oo
1637 1 (2.67 || 5 || 25 | 5oo || 1:036 || 4 || 16 || 5oo
1638 e e tº 111-13 3 | 15 || 375 | I Io9 || 4 || 16 || 375
1639 Anonyma | 1850 |14 2.1 57 6.1 2 262-29 || 5 || 28 353 |25°417 || 4 || 22 || 353
164o & Boötis 1865 |14 33 59 75 38 307'o'3 || 8 || 38. 32O e Q
1641 - 3.07.03 || 6 || 27 || 35o | I toº 9 || 6 || 27 | 35o
1642 I ‘I 33 12 475
1643 3O7·72 || 3 | I 3 || 475 | I to 59 38 º: º
| 1644 306'57 || 5 || 3 || || 467 || 1 oz.9 |io || 5 | §
1645 305-78 || 3 | 16 || 435 | I’og 8 || 4 || 26 || 435
1646 tº º © º 306:48 || 5 || 42 435 | I to 57 || 4 || 3o 435
1647 | Boötis 26o B 1867 || 4 34 z1| 58 4 18:53 || 5 || 26 || 375 | I'338 || 4 || 12 || 375
1648 e Boötis 1877 ||14 38 26 62 17 | 32 o'87 || 5 || 29 || 320 2'957 || 6 || 28 320 |
1649 32O'90 || 5 || 34 42 o || 2:816 || 4 | 18 || 420
Micrometrical Measurements of Double Stars.
229
No. #
§
>
1619 || 7%, 7%
162o 8, 9
162 I | 7, 7.
1622 || 8, 8%
1623 7'o 7. I
1624 || 7%, 8
1625 | 73,
| 1626 8, 8%
1627 | 8, 8%
1628 8%, 9
1629 || 73, 8
1630 || 8, 8+
1631 8%, 8% +
1632 || 8, 8+
1633 || 4%, 7%
1634 8, 8+
1635 | 7, 7+
1636 8, 8+
1637 |7%, 7% +
1638. 7%, 7%
1639| 6%, 7%
1640 || 4-H, 4
1641 |4} +, 4%
1642 || 4, 4
1643 |4} +, 4%
1644 || 4, 4+
1645 4, 4+
1646 4, 4-H
| 1647 | 8, 8%
1648 3, 7
1649 || 3, 8
#
# Epoch
É 18oo + Notes.
5
P.W. 42°436 | Frequently in sad confusion, but at times remarkably well seen.
* e Both very white. Confused vision. Assumed zero of dist. and calc.
Pr. Cr. 43 299 angular correction.
* "343 Both very white. Usually ill defined. Assumed zero of dist. and calc.
angular correction.
* .362 | White stars. Bad vision. Assumed zero of dist, and calc. angular
correction.
P.W. 51.319 | Both very white. Unsteady.
- 41.381 | x 1819. At times well separated.
tºm- 42'288 . Both white. Seldom divided: no distances can be obtained.
*- '379 | Disks soft, and seldom distinctly separated.
tº- '398 Vision is usually bad.
* '434 || Vision is so bad that this object cannot be safely measured.
* '442 | Circumstances very bad.
Pr. Cr e Both white. The star is badly seem : much time expended on the
. Or. 43°343 IſleåSUII’CS. -
P.W. ‘4.52 | Both yellowish.
*- '454 | Both yellowish. Good occasional views.
Gº- 48° 5 51 a Boötis, A + B, pale yellow ; C, deep purple. The large star not
seen double, or elongated. -
wº- 4o'3 Io || > 1834. Very bad vision. Obs. with my own micrometer.
º- '589 | Badly defined and unsteady.
sºmºsºme '617 | Bad vision.
*- 48-496 || Both white. Unsteady and diffused.
* 49'477 | Both very white. At times well seen, but very unsteady. .
* 51'521 | x 1850. Both white. Fair circumstances.
tº- 41'572 & Boötis. Stars light yellow. Daylight.
Pr. Cr. 43°318 . Both white. Sometimes neatly seen.
Sph. Cr. 47.294 | Both very light yellow ; furred and unsteady.
sºm- ‘296 || Both white. Perfect definition.
P.W. 48.431 | Both light yellow. Daylight. Good vision.
Sph. Cr. 45o | White stars.
smºs- '474 | Well defined, but unsteady.
P.W. 49'406 Boötis 26o B. A., white ; B, purplish 2 Vision indifferent.
sº- 41.324 s Boötis, Transient good glimpses.
sº- 517 A, orange ; B, blue.
230 Rev. W. R. DAWEs, Catalogue of




ag #| | | | | | | #| | | .
... I . ..., || 3 || R.A. |N.P.D. ..., | #| | | || à | # # ;
No. Designation. #3 2. 1850. 1850. Position. # # & à - # B: &
& t 2 tº h m s] o / o º 3ool '!
1650 s Boötis 1877 14 38 26 62 17 | 32 I-95 || 5 || 35 {. 2-6 Io || 4 || 19 || 64o
1651 (continued) 323.87 || 3 || 26 || 467 || 2:619 || 4 || 32 467
1652 321-75 || 5 || 43 || 467 || 2:649 || 8 || 67 || 467
1653 32 1.78 || 5 || 41 || 467 || 2:749 || 4 || 3o || 467
1654 32.2° 52 || 2 | I 3 || 435 | .2°747 || 3 | I o 435
1655 322'27 || 2 || 14 5oo || 2:73 I | 6 || 36 || 5oo
1656 323'oz 5 || 4o 48o || 2:761 || 6 || 45 || 48o
1657 32293 || 7 || 54 || 48o || 2:631 || 6 || 42 || 48o
1658 § º e is 323'o8 || 3 || 26 || 48o || 2:667 || 6 || 59 || 48o
1659 || Anonyma | 1881 |14 39 27 88 24 || 3:56:23 || 3 || 14 || 252 || 3'8oo || 6 || 28 252
1660 | Boötis 286 B | 1884 ||14. 41 44 65 o' 54.90 || 2 | 15 467 || 1:35o || 4 || 27 | 467
1661 ź Boötis 1888 |14. 44 28 70 16 || 323'50 || 3 | to 3oo || 7°284 || 4 || 14 || 3oo
1662 - 323-67 || 5 || 3 I 490 || 7'ogo || 4 || 19 || 490
1663 324'92 || 5 || 22 || 320 7° 14′o | 6 || 26 || 32O
1664 323:37 || 5 | 20 | 3oo | 7268 4 | 12 || 300
1665 322'42 || 3 || 23 3oo | 6’953 || 6 || 37 || 3oo
1666 32290 || 3 || 26 || 42O || 7 Io9 || 4 || 34 || 42O
1667 3.22.75 || 5 || 25 | 185 | 6′702 || 5 || 25 | 185
1668 3 19' 12 || 3 || 17 | 435 | 6’873 | Io 55 || 435
1669 318:72 || 5 || 4o 38o || 6-655 || 4 || 27 | 38o
1670 317-80 || 2 | 15 435 | 6′758 || 3 || 1 || || 435
1671 317-78 || 5 || 32 375 || 6-675 || 4 || 28 375
1672 3 18:08 || 5 || 32 || 252 || 6′755 || 4 || 25 252
1673 312. I 5 || 5 || 32 5oo | 6′3 Io || 6 || 29 5oo
| 1674 31 I-88 || 7 || 41 220 | 6’287 || 3 || 1 o 220
1675 is tº we tº e is 31 I '95 || 5 || 32 220 | 6’198 || 6 || 24 220
1676 || 39 Boötis 1890 || 4 44 36|4o 4o 44; 52 I 6 42O
1677 44'60 | 3 || 17 | 420 tº tº
1678 43-63 || 3 | 19 || 375 || 3:749 || 4 || 26 || 375
1679 tº º º e 43-63 || 3 || 23 375 || 3:756 || 6 || 46 375
168o Anonyma [288]|14. 46 22|73 41 || 2 || 1:37 || 3 8 || 435 o'6 est. . . . I 435
Micrometrical Measurements of Double Stars.
23 I

o, *
.# §
£ # Epoch
No. § § 18oo + Notes.
> >
1650 | 3, 7 P. W. |47–342 | A, yellow; B, green blue.
1651 + 3, 6 * 48°42O | A, yellow; B, green. Admirably defined and pretty steady.
1652 3, 6 *- '428 A, yellow; B, green. At times very well seen, and very steady.
1653 || 3, 6% - '433 A, bright yellow; B, pale green. At times most admirably defined.
1654 Sph. Pr. ‘45o Admirably seen at times. The sphere and prism combined. Zero of
dist. from single image; and therefore only half weight allowed.
1655 P. W. '452 At first perfectly well seen; but clouds formed, and vision deteriorated.
1656 tº- 54'47.2 With Alvam Clark’s 73-in. object-glass. Daylight : well seen, but un-
- steady.
1657 - '55° | Same telescope. Brilliant sunshine. Admirably seen in general. '
I 65 8 - ‘553 Same telescope. Sunshine. Star most deliciously seen, and almost
perfectly steady.
1659 || 7#, 9 tº- 49469 | x 1881. A, white; B, purplish 2 Diffused and extremely unsteady.
1660 63, 8 e- 48°433 Boötis 286 B. A, white; B, brownish. Well seen.
1661 5, 7% - 40°283 | # Boötis. Wretched vision.
1662 5, 7% *- ‘4 I I Obs. with my own micrometer.
1663 *- ‘52 I Obs. tolerable.
1664 || 4, 7 tº- 41 '42O | Wretched vision.
1665 5, 7 +- 42° 163 || Night brilliant and bad.
1666 5, 7 *- '414 | Very well seen.
1667 || 5, 8 || Pr. Cr. 43-332 | Very unsteady. Assumed zero of dist, and calc. angular correction.
1668 || 4}, 7 P. W. 47.338 A, pale yellow ; B, purple. Unsteady, but at times well defined.
1669 - '477 Daylight. Favourable.
* º A, light yellow ; B, deep lilac. Sphere and prism combined. Zero of
1670 5, 7 Sph. Cr. 48’450 'dist from single image; therefore only # weight allowed.
1671 5, 7 P. W. '49 I A, reddish-yellow ; B, plum-colour.
1672 © *- '509 Daylight. •
* .. With Alvam Clark's 73-in. object-glass. Unsteady and usually ill
1673 e 54'376 defined.
1674 * ‘5 O I | Same telescope. Sunshine. Clouded.
- - Same telescope. Bright sunshine. The small star was very well seem
1675 5 O4. at 5' 45" m.t. July 4.
- 1676 || 5, 5% *- 43°458 || 39 Boötis. Both pale yellow. Suddenly and completely clouded.
1677 5, 6 * ‘472 | Both pale yellow. Vision very indifferent. -
1678 6, 6% * 48°491 | A, very white; B, pinkish, a very light tinge.
I 679 6, 6% *- ‘524 | Both very light yellow. Usually well seen. -
- e { { 3 y
I68o 6}, 7 - 47° 337 O x 2.88. Both very white. Termed by O > “fortasse oblonga.” It
must surely have separated.
232
Rev. W. R. DAwEs, Catalogue of


No. | Designation. . # #2 #. # Position. - # # # # # #
ºs # # | #
1681 | 44 Boötis I9o9 1, ;# si 4i 46 235 15 6 | 27 | 32o s'949 4 | 16 | 32o
1682 | 236 1o | 6 | 36 | 6oo 3 857 4 | 16 | 6oo
1683 235 65 | 6 | 27 | 32o | 3'789 | 4 | 19 | 32o
1684 235'53 | 5 | 3o | 42o | 3'912 | 6 | 31 | 42o
| 1685 235 75 | 5 | 25 | 6oo | 3'816 | 6 | 31 | 6oo
I686 235 92 | 5 | 3o | 42o | 3'961 | 4 | 18 | 42o
1687 236 17 | 2 | 1o | 32o © º | @ $
I688 236 o2 | 3 | I 5 | 3oo | 4"o52 | 6 | 18 | 3oo
1689 236"o2 | 3 | I8 | 32o | 4'ool | 4 | 22 | 32o
169o 235'52 | 4 | I 7 | 3oo © © f) ©
1691 235 62 | 6 | 53 | 3oo | 3'84I | 6 | 45 | 3oo
1692 235-88 | 6 | 36 | 35o | 3'79o | 3 | 2 1 | 35o
1693 238o3 | 3 | 29 | 467 | 4'2o9 | 4 | 3o | 467
1694 · 237-62 | 5 | 34 | 5oo | 4'224 | 4 | 14 | 5oo
| 1695 237'53 | 5 | 39 | 5oo | 4'2o6 | 6 | 38 | 5oo
1696 237-27 | 3 | 24 | 375 | 4'364 | 6 | 48 | 375
1697 236 74 | 5 | 34 | 353 | 4'498 | 6 | 38 | 353
1698 237 77 | 5 | 36 | 357 | 4'584 | 4 | 2o | 357
1699 | Anonyma | 1931 I 5 1 1 3 I| 79 I | 172'4o | 5 | 4o | 375 | I3'32 I | 4 | 26 | 375
17oo 17Iº68 | 3 | 23 | 252 | 13'27o | 4 | 28 | 252
17oI 172 I 1 | 3 | 23 | 353 | 13'o96 | 6 | 42 | 353
17o2 | Coronae I B | 1932 |1 5 1 1 55| 62 7 | 28o'95 | 2 | 16 | 467 | 1'495 | 4 | 29 | 467
17o3 28o'28 | 5 | 45 | 435 | 1'413 | 4 | 26 | 435
I7o4 281 1 5 | 5 | 28 | 375 | I'428 | 6 | 25 | 375
17o5 284 o7 | 5 | 3o | 4o4 | 1'36o | 6 | 31 | 4o4 |
17o6 | m Coronae I937 I 5 I7 o 59 Io | I I9° I o | 2 | I I | 32o | o 5 est.| . . 32o
17o7 I 2 I*7o | 2 | 4 #
17o8 I3I "o2 | 5 | I I | 49o | o'5 est,| . . 49O
I7o9 136-62 | 12 | 43 #
17 I o I49'32 | 7 | 44 | 6oo | o'495 | I 3 | 6oo
17 I I I47'7o | 7 | 39 | 6oo
Micrometrical Measurements of Double Stars.
233
No. i ă * Notes.
CŞ .8
> >
1681 6, 6% P. W. 4o'526 44 Boötis. Bad definition.
1682 5, 6 -e '570 | Stars yellowish.
1683 e ‘º -* ‘584 || Vision very bad.
1684 53, 6 -* '603 || Both pale yellow.
1685 5, 5% -s '617 | Twilight.
1686 5, 5 + -* 4 I'32 I | Both white. Generally ill defined and unsteady.
1687 || 5, .5% - 567 | Both white.
1688 5, 5% -sº ‘57o | White stars.
1689 || 5%, 6 -> '603 Unsteady and generally ill defined.
1690 5, 5} --> 42.258 || Bad vision; obs, obtained with great difficulty.
1691 5, 5% *- ‘441 || Bright sunshine. Very favourable. Observed when about 2h east.
1692 || 5%, 6 Pr. Cr. ‘745 *...* º: . ... 5h west. Assumed zero of dist.
1693 5, 6 P. W. 48°431 | Both white. Beautifully seen.
1694 | 5, 5% -> ‘5 Io Both white. Dazzling unsteadiness.
1695 5, 5 § - ‘52 6 Bºf: W. gºtiable. from utter confusion w fine definition
1696 5, 5% -sº 49'477 Bºº. **ºnal perfect steadiness and definition, with fits
1697 5, 5% - 5 I ‘52 I | Both white. Unsteady.
1698 e g * 54.737 || With Alvan Clark's 74-inch object-glass. Sadly unsteady and diffused.
1699 || 6%, 8 - 48°49 I X º3** yellow; B, orange. One of O 2's List for comparison
17oo 63, 73 -mºs 49-469 | Both pale yellow.
1701 || 6-6, 7-9 - 51.319 | Both white. Very unsteady.
1702 || 63, 6% -º 48° 433 || Coronae I B. Both stars white; sometimes well seen.
1703 || 6, 6} | Sph. Cr. '474 | Pale yellow stars.
1704 || 6}, 6} | P. W. ‘529 | Both yellowish.
I 705 e Sph. Cr. 54:398 || With Alvan Clark's 73-in. object-glass. Very unsteady.
1706 6, 63 P. W. 39'587 n Coronae. Often pretty and distinct. Disk elongated.
1707 -i. ‘603 Daylight. Elongation decided, and measurable in position.
1708 -- 40°4 I 7 With my own micrometer.
I 709 -*. '67 4. Daylight.
17 Io 6, 6} * 41.611 | Sometimes deeply notched and almost separated.
I 7 I 1 || 6, 6% -*s '632 || Deeply notched at best.
ROYAL ASTRON.
SOC. WOL. XXXV.
234. Rev. W. R. DAWEs, Catalogue of

. ... [Bá3| R.A. |NP.D.] ... #| # # #|# | #
No. Desigmation. #: *| 1850. 1856. Position. ; # §: É # : # §:
t—J O CŞ
- h m s O A O - - //
1712 | n Coronae 1937|15 17 o' 59 10 || 14878 || 3 || 10 || 426 |
1713 (continued) I 5o'oo || 5 || 13 ') 32O
- 42O
1714. I 5.1°82 || 5 || 24 32O
1715 15oo8 || 5 || 15 320
| 1716 I 54.90 || 6 || 28 420 o'55 est. . .
1717. 160-68 || 3 | 12 || 420 o'5 est. . . . . . . . .
1718 19677 | 6 || 29 || 435 | O'6 est. I | 1 || 435
1719 zoo’83 || 5 || 36 || 38o o’65 est| 1 2 38o
1720 203.65 12 || 70 {; o'657 |zo 63 ;
1721 207:43 || 3 || 14 || 435 | o'692 || 6 | 16 || 435
1722 207-77 || 5 || 26 5oo o'638 |Io 21 5oo
1723 2 18:18 || 5 || 24 || 5oo o'694 || 4 || 8 || 5oo
I 724 2 18:53 || 3 || 1 o 5oo
| I 725 & 239'57 || 5 | 19 || 467 o'525 || 4 || 4 || 467
1726 235'53 || 5 || 1 || || 467 o’6 est. I | 2 || 467
1727 25o 14 || 3 || 6 || 375 o'5 est. . . | 2 || 375
1728 272°30 || 3 || 3 || 467 o'4 est. ... | 1 || 467
I 729 269'47 || 7 | 12 87o o'45 est] .. 1 | 87o
173 o 275-39 || 5 || 14 || 467 o'45 est] ... || 2 || 467
173 I 275"o? | 5 || 12 467 || o'45 est|.. || 2 || 467
1732 3oo. 13 || 5 | 18 || 860 o'477 || 4 || 8 || 86o
I 733 299'oz Io 38 86o o'398 || 2 || 4 || 860
I 734 tº e e e e . || 307'o 1 || 5 || 1 || || 8 || 5 || O'502 || 4 || 8 || 815
I735 Cº., 1938 || 5 18 51 52 8 || 306.70 || 7 || 27 | 490 o'890 4 8 || 490
1736 e - 305-53 || 5 || 35 | 490 o'813 || 6 || 29 |490
1737 305'45 || 2 || 5 || 32O | . . . .
1738 3ozºo; 3 || 14 || 320 o’957 || 2 || 6 || 420
I739 3O3'47 || 5 | 12 || 32O
174o 303.65 || 5 | 19 || 420
| I 74. I 3O2'42 || 5 || 33 32O || O'754 || 4 | I 2 | 32O
I 742 303:45 || 5 || 28 320 o'893 || 6 || 20 | 320
Micrometrical Measurements of Double Stars.
235
No. i § Epoch Not
5 18oo + OUCS,
> §
1712 6, 6% P. W. 41 '636 || Yellowish stars.
1713 6, 6% tºº-º-º: '666 | Both stars light yellow. Occasionally well elongated.
1714| 6, 6% * - sº '691 | Frequently notched.
1715 6, 6% tºº 7 o6 Both straw-coloured,
17.16|| 5, 5% tºº 42°535 | White stars. At best a decidedly notched disk.
1717 | 6, 6% {º} '672 | Both white. Occasionally pretty well seen.
1718, 5%, 6 *º 46'879 | Not divided, but the elongation is perfectly measurable in position.
I 719 || 5, 5 # tº 47' 5 26 | Both white. In pretty firm contact; beautifully seen at times.
I 720 5, 5% *=e 48.258 | Power, 780 for eight of the angles, which is much better than 467.
172 I 6, 6% Sph. Cr. '475 Air not very good; stars in contact at best.
1722 || 5%, 6 P. W. ‘557 | Both white. Indifferent vision.
1723| 5%, 6 * 49.442 | Pretty well seen at first, but became very unsteady.
1724, 5}, tºº '447 | The air is not sufficiently favourable.
1725 | 5%, tºº 51.414 | A tolerable elongation scarcely notched.
1726|| 6, 6% sº “4 I7 Excessively difficult from the moulding of the elongated disk.
1727 º tºma 52°52 I Scarcely notched; excessively difficult.
17 28 *º 53” 526 The disk is more nearly round than I have ever before seen it.
I 729 emsº 540 Scarcely elongated.
I 73O º '693 Twilight. When best defined the elongation is decided. -
173 I tº-º-º- '698 Twilight. A slightly elongated disk, at times sharply defined and steady.
1732 . 54'379 With Alvan Clark’s 73-in. object glass. Disk occasionally notched,
— Same tel. A good elongation decidedly notched; the dist, was obtained
1733 • *mº “409 by comparison of the major and minor axes with the diam, of one web.
I 734. tºº-ºº: 554 | Same telescope. Star sadly unsteady, but at best notched.
1735 | 8, tºº- 4O'3 Io P. xv. 74 = a, Boötis. Observed with my own micrometer.
1736|| 8, *sº '417 | Favourable.
I737 tº-º-º: '589 | Stars seldom separated.
1738|| 8%, 9 ſº 41.307 | Pos, tolerable; dist, very difficult and poor.
17.39| 8, 9 tºº '603 || Both white.
174o 8, 8 # &=º '636 Both white.
1741 8%, 9 ºsmºsºms .666 || Sometimes meatly defined.
1742 | 8%, wº-ºº: '706 | Both stars white.
236 Rev. W. R. DAWEs, Catalogue of


: R.A N.P.D # +5 . § # +5 g
No. Designation. # # Ž I sº. s sº ſº Position. § # § ; § § §
{- . - § B. 3. *S # | 3: &
ac 3 6
h m s] o / O // *º-
1743| P. xy. 74, 1938||15 1851|52 8 || 303.97 || 6 || 35 | 320 **
I744 (continued) 3oo'5o || 6 | 18 || 420
I 745 3o I 12 || 1 || 4 || 42O tº º
1746 3o I-67 || 3 || 1 I 420 |o'85 est. . .
1747 283-82 || 5 | 18 || 322 |o:75 est. ... 1 || 322
1748 284.95 || 5 || 9 || 475 |o'490 || 4 || Io 475
1749 290'33 || 5 || 27 | 435 lo'65 est. ... | 3 || 435
1750 285'93 || 5 || 33 || 435 | o'65 est. . . || 2 || 435
175 I 285-27 || 5 || 27 | 38o o'6 est. 2 || 38o
1752 286°o8 || 5 || 17 | 591 |o'556 |Io 23 591
I 753 28.1°25 || 5 || 27 | 435 | O'649 || 4 || II | 435
I 754 28o33 || 3 || Io 5oo |o'676 || 6 | 16 || 5oo
I 755 276.83 || 7 || 33 || 375 || O'65 est. . . || 2 || 375
1756 276. 12 || 7 || 28 5oo |o:641 || 4 || 8 || 5 oc
1757 27630 || 5 || 25 | Soo lo'724 || 4 || 8 || 5oo
1758 265'86 || 5 || Io 467 o'5 est. 2 467
I759 267°og || 5 || 13 || 467 o'55 est. . . || 2 || 467
1760 262-22 || 5 || Io 375 |o 55 est. . 2 | 375
1761 254'63 || 3 || 8 || 353 |o 5 est. 2 || 353
1762 25o'33 || 5 || 36 || 5oo o'672 || 4 || 12 || 5oo
1763 246'52 || 7 || 29 || 5oo |o'5 est. | 1 || 3 || 5oo
1764 tº e tº e 25o'85 || 5 || 28 || 48o |o 519 || 6 || 22 || 48o
1765 | Anonyma ||296]|15 21 9|45 27 || 325°23 || 5 || 25 | 375 | I'597 |io || 39 || 375
1766|| Coronae 17 B | 1950 || 5 23 33| 63 58| 92-80 || 5 | 18 || 375 || 3:324 || 4 || 12 || 375
1767 * Serpent © e 92°83 || 3 || 22 || 375 || 3:239 || 4 || 3 || || 375
1768 {’ gº) 1954|| 5 27 38|78 57| 19490 || 5 || 32 330 2.913 || 4 || 17 | 330
1769 tº e 195'52 || 3 | 12 || 490 |2-932 || 4 || 16 || 490
1770 196'52 || 5 || 29 || 420 |2-924 || 4 || 27 | 420
1771 196°o3 || 5 || 23 3oo || 3: I I 5 || 4 || 14 || 3oo
1772 195'67 || 5 || 25 | 320 || 3’oo8 || 6 || 23 || 320
1773 195'87 || 4 || 16 || 35o ||2-854 || 4 || 16 || 35o
Micrometrical Measurements of Double Stars. 237
o, $ºt
3 $8
3 # Epoch
No º, É 18oo + Notes.
CŞ yº
> >
1743| 8%, 9 P. W. 41'797 | Stars separated by glimpses only.
1744| 8%, 9 wºmmº 42'327 | Definition unusually bad.
1745 8, 8% * . ‘338 || Vision is too bad for this object.
1746|| 8, 9 --> ‘535 | Seen double by transient glimpses only.
1747 7}, 8 *mºmº 46.799 Seldom seen double; might bad and star low.
1748| 8, 8% | Sph. Cr. 47.296 || Scarcely ever separated. Dist. estimated o”6.
1749| 8, 8% P. W. ‘296 || Both stars are white. *
17 So 7%, 8 -º 395 | Disks in loose contact.
1751 7 #, 8 — 526 Both white, just in contact.
I }. 8 -sº .2 & 3 | A notched elongation at best, but the centres may be fixed on tolerably
752 | 73, 48.25 well.
1753 || 7, 8 Sph. Cr. '474 | Disks in contact.
I 754 7 #, 8 P. W. 5 I 3 Disks in firm contact. Air not sufficiently favourable.
1755 tº º º '663 | When best seen, in firm contact.
1756, 7}, 8 tº-mº 49.442 At best a slightly-notched wedge. Night fine.
1757 7 § , 8. -* ‘447 Both stars ash-coloured. At first remarkably well seen, and then notched.
1758| 7, 8 *sºms 51.414 | A wedge. Very difficult.
1759, 7' 5, 8°o -> ‘417 Very difficult; moulds and grows confused.
I 760 * - -> 52°52O Elongated, but scarcely notched.
I 76 I & ſº -*º- 53'709 Twilight. At best a well-defined elongation slightly notched, but unsteady.
With Alvan Clark’s 73-in. object-glass. A dark line crosses the deeply-
1762 © e *ss 54'379 notched disk, but no distinct separation.
e Same telescope. At best a deeply-notched disk, almost divided. Air not
1763 & © - 5 Io very good; daylight.
6 © Same telescope. A dark line across the elongated disk when best seen,
1704 Cº º tº- 554. but the star is sadly unsteady.
1765 e e -> 48° 529 o 2 296. Vision is very variable and the stars diffused.
1766 7}, 8% --> 49-439 || Corona, 17 B. A., white s B, dusky. Disks diffused.
1767 || 7%, 8% --> '442 A, white; B, purplish f
1768 4, 5 tº-mº 40°406 3 Serpentis. Observed with my own micrometer.
1769| 4, 5} * '4 II | Same micrometer.
1770 tº º --- 41.381 | Sometimes well seen.
1771 5, 6 * '403 | The stars are both very white.
1772 || 4, 6 *e '502 || Stars unsteady, but occasionally well defined.
1773 || 4, 6 | Pr. Cr. 43°439 | Both white. Assumed zero of dist, and calculated angular correction.
238. Rev. W. R. DAWEs, Catalogue of
: R.A. N.P.D.l # à | < É # # 1 a
No. Designation. #. t I sº. s º tº Position. i ; É # ; #
- h m s] o / O // *= i =mºmºsis rººmsºmºmº
1774| 3 Serpentis 1954|| 5 27 38|78 57| 194.68 || 3 || 22 || 353 || 3:061 || 4 || 30 || 353
22, (continued) . 194'88 || 3 || 24 5oo || 2:978 || 6 || 47 5oo
1776|| 195' I 3 || 5 || 35 | 375 || 3'oo I | 4 || 27 | 375
1777 194-45 || 3 || 24 375 || 3: Io9 || 4 || 3o 375
1778 19376 || 3 || 23 375 || 3'o69 || 4 || 31 || 375
1779 19449 || 5 || 37 || 467 || 3:034 || 4 || 32 467
178o tº º 194-04 || 5 || 38 || 353 || 3:033 6 || 44 || 353
1781 | Anonyma [298] I 5 30 37|49 41 | 18582 || 5 || 26 || 435 | 1:231 || 4 || 12 || 435
1782 & Coronae 1965 || 5 33 44 52 52 || 301-27 | 3 || 24 || 320 | 6’194 || 6 || 49 || 320
1783 3oo'78 || 6 || 46 185 | 6’209 || 6 || 47 | 185
1784. 3oi-33 || 2 | 18 || 353 || 6′o73 || 4 || 33 || 353
1785 3ol. 35 | 2 || 14 || 435 | 6’201 || 3 || 9 || 435
1786 3o I'5o || 5 || 47 || 375 || 6’17o || 4 || 3 | | 375
1787 tº º . e. e. tº º 3oo’88 || 3 || 3o || 480 || 6’285 || 4 || 29 || 48o
1788 y Coronae 1967 || 5 36 27 63 14 || 233:67 || 3 || 3 || 420 | ,
1789 x. Single f 52O.
1790 288-88 || 5 || Io 6oo o'6est. 6oo
1791 288-25 || 5 | I 5 || 5oo lo'7est. | 3 || 5oo
1792 287'36 || 5 || 1 I {: o' 5 est. | 2 || 5oo
I 793 276'92 || 5 || Io 467 o'45 est. ... 2 467
I 794 285'76 || 5 || 12 || 467 |o 5 est. 2 467
I 795 289-17 | 5 || 19 860 o-668 || 4 || 12 86o
1796 e e tº º tº e 28o 99 || 5 || 28 || 86o o'718 || 6 || 12 || 860
I 797 tºº 1998 || 15 56 8|1oo 57| 1642 || 7 || 5o 320 || 1:221 || 2 || 6 || 320
1798 tº ºn I 7'23 || 5 || 33 || 32O | I 3O4 || 4 | I 3 || 32O
I799 18-28 || 5 || 22 || 320 || 1:264 || 4 || 12 || 320
I 8oo 19:57 || 5 || 17 | 320 | I-242 || 6 || 20 | 32 o
I8o I I 8:35 | 5 || 27 | 32O || I'O45 || 4 | I 3 || 32O
I 8oz. 1873 || 3 | 16 || 320 || 1' 169 || 6 || 22 || 320
1803 19:38 || 2 || 6 || 320 tº º
1804 I9'os | 3 || 2 I 42 o || 1:22 I | 4 || 28 320
Micrometrical Measurements of Double Stars.
239
& § # 4.
£ # Epoch
No. § 9 18oo + Notes.
CŞ ..Sº r
> >
1774 3, 4} | P. W. 48-428 || Both white. Pretty steady, but furred.
I 775 3, 4 tº- 513 | Unsteady and very variable in definition.
1776|| 3, 4 º- ‘583 || A, very pale yellow ; B, greenish white.
1777| 3%, 4. *- 49'442 | White stars.
1778| 3%, 4. * 447 A, white; B, greenish white.
- tº- º At times admirably defined and tolerably steady. Perforated whol
I y denned anſ erably ste rated Whole
779| 38, 4% 5 I'4. I4. aperture. y
1780 e - t- 53°709 Sunshine. A, white; B, pale green.
1781 || 7%, 7% Sph. Cr. 48 '682 ox 298. Both white.
1782 5, 6 P. W. 41-665 & Corona. A, rather yellow; B, slightly purple.
I783| 4, 5 Pr. Ct. 43-627 A, white; B, purplish. Stars pretty steady and usually neatly defined.
1784|4, 53 | P. W. 43,428 A, greenish white; B, deeper green. Pretty steady. +
1785 Pr. Cr. "4.5o The zero of distance from coincidence of images; . . only 3 weight is
- allowed. - -
1786 - © P. W. ‘5 Io Daylight. -
I º - e Obs. with Alvan Clark's 73-in. object-glass. Sun shining brightly. Air
787 54°55 4 favourable. -
1788 4. º- 4o'871 Daylight. If the disk is really elongated it is in the 8.p. quadrant. Air
not very good.
1789 *- 42.532 || Twilight. No decided elongation.
1790 4, 7 ? - 43'4-54 Daylight. A wedge. With great care the obs, are satisfactory.
- A, light yellow ; B, purplish 2 Daylight. The disk is a wedge, some-
I79 I 4, - 48.545 'times notched.
1792 © e *- 53'54 o Excessively difficult, though the night is fine. The small k does not
bear very high magnifiers.
I 793 © *- ‘709 Sunshine. Excessively difficult, only slightly elongated.
* º Sun in horizon. At times sharply defined and pretty steady, but too
1794| 4, 8 753 difficult for this telescope. y
I795 e - º- 54°379 Obs. with Alvan Clark's 73-in. object-glass. Moulds sadly; otherwise
might be measured without much difficulty. Disks in contact.
1796|| 4, 7 - '409 | Same tel. Disks in loose contact; both quite round when best seen.
1797.| 6, 6 — 39'587 | g Scorpii A & B. Strong twilight.
1798 6, 6 *- -636 | Pretty steady and sharply defined.
I799 6, 6 - 4o 532 | Both stars yellowish.
18oo 5, 5 *- 557 Both yellowish. The companion C is blue, 9 mag.
1801 || 4%, 4% - '589 Obs. begun by daylight. -
1802 || 6, 6 - 41:529 |The stars are both straw-colour; C is blue.
18o3| 6, 6 - 537 | Very bad vision.
1804 - 53, 5% *- •6 32 By twilight. Good vision.
24O Rev. W. R. DAWEs, Catalogue of


zº # +s § # +* e
§ # 3| R.A. |N.P.D. # | #, § : # 5, §
No. Designation. 3 & 2. 185o. 1850. Position. # 3 ; j: ; 3 #
§d # | 3 || 3: ſº # B | &
|-l O O
1805 #Scorpii A&B 1998 is 58 glio& s? 2 #88. Io 4o 42O //
1896 (continued) e 21:13 || 6 || 25 {:} • •
1807 23' 17 || 2 | I 1 || 35o i I o81 2 || 1 O 35o
I 8o3 24-25 || 2 || 6 || 35o | I I of 2 || 6 || 35o
1809 24°58 || 2 | Io 3oo
I 8 Io 30°20 || 5 || 25 | 322 || 1:o est. . .
I 81 I 3o:87 || 3 || 15 467 || 1:286 6| 20 || 467
I 812 3o'o.3 || 5 || 2 | | 375 || 1'o67 || 4 || 8 || 375
1813 3077 || 5 || 27 | 375 || 1: 144 || 6 || 20 | 375
1814 a e 46-28 || 5 || 17 | 353 - «» tº º
1815 |É ScorpiiA&C tº º tº º 69'45 || 6 || 3o 320 || 7-435 | 6 || 26 || 320 |
1816 || 49 Serpentis 2021 |16 6 19 76 4| 3 18:o; | 5 || 31 || 420 || 3:434 4 | I 3 || 42O
1817 gº tº 321-27 || 3 || Io 375 || 3:3 + |est.| 3 || 375
1818 a Coronae | 2032 |16 9 4| 55 45] 144.33 || 4 || 20 | 320 || 1:600 || 6 | 18 || 320
1819 146’23 || 7 || 49 || 320 || 1:760 | Io 37 || 320
I 82 o 149'45 || 6 || 27 | 320 | 1.432 4 I 2 || 32O
I 82 I I 5ozoo || 3 || 17 || 420 || 1:600 4 | I 8 || 42O
I 822 I 49' I 3 3 7 || 3oo º º e - I tº
1823 15o 15 || 5 || 20 | 320 || 1:648 || 6 || || 8 || 320
1824 I 50-72 || 5 || 29 || 320 || 1:663 6| 29 || 320
1825 153-27 | 6 || 20 420
1826 I 56'50 6 || 49 42O e e
1827 156.5o | 8 || 3 || | 185 1774 || 8 || 33 185
I 828 166:15 || 5 || 39 640 | 1994 || 4 || 32 640
1829 165.85 || 5 || 4o 38o | I '761 4 28 || 38o
1830 168-28 || 5 || 42 || 375 | 1965 4 || 3 || || 375
1831 169-22 || 5 || 33 5oo | 1974 | 6 || 34 5oo
1832 168° 52 || 5 || 35 | 5oo || 2:05 I 4 || 3o | Soo
1833 I7o'Io || 3 || 27 | 375 || 2°og I 4 || 3 || || 375
I 834 173.81 || 5 || 3 || || 467 || 2:265 6|| 46 467
1835. 179 og | 5 || 27 || 467
Micrometrical Measurements of Double Stars.
24. I
& No.
1805
1806
1807
I 8o3
1809
I 81 o
I 812
1813
1814
1815
1816
1817
1818
1819
| 1820
I 82 I
I 822
1823
1824
1825
1826
1827
I 828
1829
1830
1831
1832
1833
1834
1835
18 I I
# # Epoch
5, g 18oo + Notes.
CŞ .8
> a
6, 6 P. W. 42°420 The stars are both yellowish white. Disks often fairly separated, but
very unsteady.
6, 6 * = gº ‘532 | Both pale yellow.
6, 6 || Sph. Cr. 43°401 | Both pale yellow; tolerably seen, but very unsteady.
6, 6 gºmºs '406 | Very bad vision.
6, 6 P. W. '455 | Both white. Stars seldom separable; air very bad.
tº e gº 47°55 I Too unsteady for measures of distance.
43, 4}+ - 48°433 Both stars light yellow. The air is greatly disturbed.
5, 5 + gºme '546 | Both yellow; sadly unsteady and ill defined in general.
5, 5 + * , '592 || Yellow stars, very nearly equal.
tº º 53'5 26 | Vision is bad; the distance cannot be measured.
5, 9 {-> 4o 557 | # Scorpii A. & C. The small star is blue.
tºmº * 49 Serpentis. Haze is forming; the assigned magnitudes are therefore
7, 7% - 41-381 probably too small. -
6, 6–H Gºmº 49°439 | Both white. Air very bad. Ther. 39° on June 10.
*= 39'534 | a Coronae. Unsteady.
6, 8 – 40'466 | Pos. tolerable; Dist, unsatisfactory.
6, 7 *E=- '584 || Vision is extremely bad.
6%, 7 $º -87.1 Obs, begun in twilight.
6, 7 — 4 I (42O Bad circumstances.
6, 7 iº '422 Very unsteady.
6, 7 ſºmº 537 Vision is very bad.
6, 7 tºmmº 42-370 | The night is extremely bad.
6, 8 º 43.458 || Both white. Favourable.
6, 8 Pr. Cr. '474 || Vision is intolerably bad.
6, 7 P. W. 47.343 A, pale yellow; B, pale greenish blue. Well seen.
6 A, pale yellow; B, rather paler yellow. Perfectly well seen at times;
6, 7 ſº-º-º: • ‘52 by daylight. - -
6, 6% wºmmºn 48-512 || A, pale yellow; B, greenish. By daylight. At times very well seen.
6, 7 m=e 526 || A, light yellow; B, greenish white.
6, 7 *g *5 46 || A, straw-colour; B, greenish yellow.
6, 6% * 49.447 | A, pale yellow ; B, greenish white.
6, 7 * 51.417 | A, brownish yellow; B, greenish. At times admirably seen.
tºº 53-5 18 Unsteady. Clouded.
ROYAL ASTRON. SOC. VoI. XXXV. . . 1 I
242 Rev. W. R. DAWEs, Catalogue of


: - # & d; # +3
No. Designation. f # Ž º: - * | Position. i # : i É # :
35 g| = | * a # B | \, .
h m sl o / O •- // a-mºms sm-- I -
1836| g Coronae, 2032 |16 9 4|55 45 || 17786 || 5 || 43 5oo || 2:357 || 6 || 59 || 5oo
|s, (continued) 177°24 || 5 || 48 || 353 || 2:368 || 4 || 38 353
1838 177-81 || 5 || 32 || 467 || 2:484 || 4 || 27 || 467
1839 178.68 || 5 || 36 || 48o || 2:326 || 6 || 4 || || 48o
1840 178° 55 || 5 || 29 || 630 || 2:223 || 6 || 36 || 43o
1841 tº º 178’ I 5 || 5 || 34 || 48o || 2:234 Io 71 || 48o
1842 | Antares ... 16 20 13|| 16 6| 273'98 || 2 || 4 || 435 • *
1843 273.63 || 9 | 66 || 435 | 3:47 I | Io 42 || 435
1844 270°o8 || 5 || 19 || 252 || 3:642 || 4 || 14 || 252
I 845 271-62 || 5 || 20 | 375 || 3:418 || 4 || 16 || 252 |
1846 © e • . . 275'97 || 5 || 20 || 375 || 3'247 || 4 || 12 || 375
1847 m Draconis |[312||16 2.1 58|28 9 || 141 '42 || 3 || 22 || 435 || 4-7 II | 6 || 3o 435
1848 || Anonyma | 2051 |16 22 1979 4| 19.68 || 3 | 12 || 320 || 14:337 || 4 || 8 || 320
1849 | A Ophiuchi 2055 |16 23 21 |87 41 || 357'42 || 5 || 20 | 320 || O'9est. . .
1850 358'13 || 2 || 6 || 320 l-
1851 358-67 || Io 5o 6oo | I'oZ2 27 | 6oo
1852 358'90 5 zo 42O | I I 4. I 14 || 420
1853 ows |s|| 2 ||...}
420ſ
I 854 358-72 || 5 || 2 o || 42O
1855 359'48 || 3 || 26 || 420 | I 137 || 4 || 3 || || 420
1856 359-22 || 6 || 28 420 | I oA 1 || 4 || Io 420
1857 o O'O3 | I | 4 || 42O
1858 359'53 || 4 || 2 o 42O | I I49 || 4 || 17 | 42O
1859 o:30 || 6 || 3o 35o | I og 5 || 6 || 3o 35o
1860 I'45 || 5 | 16 || 420
1861 1.68 || 6 || 32 420 a 9 -
1862 6'72 || 5 || 25 435 | 1.242 || 6 || 33 435
1863 7' 5o || 5 || 34 5oo | I-236 || 4 || 20 5oo
1864 •-e 8°32 || 5 || 3 I | 375 || I'252 || 4 || 1 o 375
1865 9° 52 || 5 || 27 | 375 || 1 °223 || 4 || II | 375
1866 8.60 || 5 || 32 5oo | I'292 || 6 || 36 5oo
Micrometrical Measurements of Double Stars.
243

# # Epoch
No. # # . + Notes,
# §
1836 || 6, 7 P. W. 53'54o A, very pale yellow; B, greenish. Very steady and exquisitely defined.
1837 tº-g ‘7 I 7 || Twilight. Star almost perfectly steady and admirably defined.
1838 6, 7 * ‘723 | Unsteady, but at times very well seen.
1839 ºmºmº 54' 548 With Alvan Clark's 73-in. object-glass. Star well seen at times.
I 84o ºm- '551 | Same telescope. Star very unsteady and glimmering. .
| 1841 tºº • 570 | Same telescope. Not very steady, but pretty well seen. Twilight. .
1842||13, 8 || – |47.297 |*:::::::::::::::::::::::::::::::: ***
I 843 || 1 #, 7 # tºmmemº ‘299 *:::: º:mºre Surprisingly well seen; a most delicate and beau-
1844 I #, 8 * 48° 557 || A, red; B, purplish. Daylight.
1845 || 13, 7 Gºme '591 || A, red; B, very blue. Daylight. A beautiful object.
I 8 46 I #, 8 ammº 49' 4O6 A, red; B, green. Occasionally very well seen, but very unsteady.
n Draconis. A, pale yellow; B, blue. Exquisitely defined; a splendid
1847 2%, Io - |47°409 | and delicate object.
I 848 8 #, I O - 4. I'423 x 2051. Smaller star scarcely visible.
1849 || 4, 6 tº- 40'461 | * Ophiuchi. No distances can be obtained.
I 85o 4, 7 ºsmºs ‘532 Excessively confused.
| 1 85 I 4, 6 tºmsºmº • 570 The air is in a very bad state.
1852 4, 6 * 41-412 | Stars very unsteady.
I 853 4, 6 * 529 || Night bad.
1854 4, 5} *=º ‘57o | Stars sadly confused; no distances can be procured.
I 85 5 4, 6 * •6 32 Stars admirably defined.
1856 || 4, 6 *ms 42'535 Very unsteady and greatly diffused.
1857 || 4, 6 º 538 Both stars white. Vision is not sufficiently good for this object.
1858 4, 6 -*sº '64. I Both white. Daylight. Extremely unsteady.
1859 || 4, 6 Pr. Cr. 43.406 | Sometimes neatly defined.
1860 || 4, 6 P. W. :455 Circumstances are not sufficiently favourable.
1861 || 4, 6 --> '496 || Stars very unsteady.
1862 4, 6 || Sph. Cr. 48’474 || Vision is seldom good.
1863 || 4, 6 P. W. '510 | Both white.
1864 || 4, 6 * 524 A, very pale yellow; B, greenish white. Air bad.
1865 4, 6 *==s .#46 |A pale yellow, B, rather deep yellow. Stars rather fidgety.
1866 4, 6 557 | Both white. Seldom well seen.
ſo an 8070700 “STAVOI ‘M M Aoû ++z


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# # |#| | | | | # |# q'4'N | vºn F#3
Micrometrical Measurements of Double Stars.
245
\
§ §
No. # # . º Notes.
- CŞ ©
> §
1867 4, 6 P. W. 48° 592 | Both very pale yellow. Variable vision, seldom good.
1868 e Sph. Cr. "682 | Daylight. W
1869 || 4, 6 P. W. 49'447 At times remarkably well seen.
1870 - 4, 6 *=sº '469 || Scarcely favourable enough for this object.
187 I 4, 6 * 53°723 | Very unsteady and ill defined.
1872 º — ‘753 Sunshine. Well seen and pretty steady.
I 873 e - 54'379 || With Alvan Clark's 73-in. object-glass.
1874 o ºmºmº ‘734 || Same telescope. Star unsteady, but occasionally well seen.
. W. Y O > 3 13. Both stars white. Pos. obs. with P. W. M.; Dist. with
1875 e {sº} 47' 409 Spherical Crystal. -
| 1876 6, 6} | P. W. 48-497 || 17 Draconis. Both pale yellow, Air very favourable.
1877 © *=º 39'67 4. § º, ... * estimated. Vacancy between the
1878 2}, 8 º '688 | Well separated by glimpses.
1879 || 3}, 8 tº sºme ‘789 | Well seen by glimpses.
188o 3, 8 ºsmº- '797 - Twilight. Very unsteady and ill defined.
1881 || 3, 7 tºm- 4O'4 I 7 || Obs. with my own micrometer. Circumstances unfavourable.
I 882 *- 532 || Air bad.
1883 3, 7 tº- ‘576 | Transiently well seen.
1884 || 3, 7 tº- '638 | Sometimes well defined.
1885 3, 7 gºmºsº '641 | Both stars yellow.
| 1886 3, 7 º '66o Measures begun in daylight.
1887 e †-m- ‘764 Daylight. Tolerably good definition.
I 888 ºmns ‘769 Daylight. At first well seen.
1889 3%, 8% Cºmº 41'565 | Both stars yellow.
1890 3, 7 ſºmº ‘61 I | Sunshine. Very well seen at times. *
1891 3, 8 gººm- '69 I | Unfavourable; the distance cannot be measured.
- 1892 || 3, 7 tº- ‘799 || Yellow stars, at times completely separated. -
1893 3, 8 gººm- 42°39'O | A, golden ; B, bluish 2
| 1894 3, 7 *- ‘641 || A, yellow; B, pale yellow. Tolerably seen by glimpses.
1895 || 3, 7 tº- '672 A, yellow ; B, paler gyellow. Greatly confused and unsteady.
A, yellow; B, bluish or purplish. The larger star ill defined : the
1896 || 3, 7 Pr. Cr. 43°406 .ºund it just touches the inner edge of the small star and
1897 || 3, 7 ºsmº- '759 A, yellow; B, paler yellow. Clouded completely and permanently.
246 Rev. W. R. DAWEs, Catalogue o
- y g’



g; } # +s d; # +s
P. 3 R.A. | N.P.D. # | #, § 3 || 3 | #, §
No. Designation. É ##| Is 5.o. 1856. Position. É ; # # É ; g
*- a c # Ø- ſº # P+
- h m s w
1898 & Herculis 2084|16 35 38 5á 7 12963 6 || 43 || 35o *342 6 || 43 || 35o
1899 (continued) | II 2.73 || 3 | I 3 || 322 |
190o II 3 '70 | 1 || 4 || 322 |
1901 I 12'o6 || 6 || 48 || 435
I 902 1 12-28 || 5 || 25 26o
& 3oo
I903 **oo 19 |79 |{{so tº º & e
I 904 Io/-97 || 5 || 36 38o | 1.626 Io 88 || 38o
1905 Io9' 17 | 3 || 26 || 467 || 1:491 || 6 || 54 467
1906 Io9'23 || 2 || 9 || 78o || 1'544 || 4 || 15 78o
1907 1 oz'87 || 5 || 37 435 | 1'473 || 1 o 6o 435
1908 Ioz'73 || 5 || 35 | 375 | I-613 || 4 || 23 375
1909 IoI '90 || 5 || 37 5oo || 1:585 | Io 64 5oo
19 Io I of '27 | 7 || 52 | 375 || 1 591 || 6 || 45 || 375
I9 II 191'58 || 5 || 36|| 375 || 1:594 || 4 || 15 375
1912 Io2'38 || 5 || 3 I 435 | 1 '624 || 4 || 18 || 435
I 91.3 IoI '83 || 5 || 35 | 435 | I 519 || 2 | 13 || 435
I9 I4. 99°23 || 5 || 33 5oo | I '709 || 4 || 29 5oo
I9 I 5 8734 || 5 || 25 467 || 1:659 || 4 || 16 || 467
1916 85.36 || 3 7 || 467 e - © e i e º
I917 86-89 || 7 || 55 467 || 1:563 || 6 || 36 || 467
1918 82°52 || 5 || 22 || 5oo | I'567 || 4 || 14 5oo
1919 81-71 || 5 || 38 5oo ! I'604 || 6 || 44 5oo
I92O 79-22 || 5 || 39 78o | 1.690 || 6 | 16 || 78o
I92 I 8o'35 | 5 || 44 5oo || 1:685 || 6 || 46 5oo
I 922 78-68 || 5 || 30 || 658 || 1:607 || 6 || 3o 658
I 923 77°75 || 7 || 41 {: I '836 || 4 || 20 || 320
I924 81:20 || 5 || 38 467 | 1.686 || 6 || 44 || 467
I 92.5 74°90 || 5 || 27 | 404 || 1:533 || 6 || 33 | 404
1926 77°25 || 7 || 52 86o || 1:62o | 6 || 41 || 860
I 927 76'52 || 5 || 32 860 | 1.486 || 4 || 25 | 860
1928 75°28 || 2 | 12 || 48o || 1:552 || 4 || 18 || 480
Micrometrical Measurements of Double Stars.
247
- # # Epoch
No. # É 18oo +
> >
1898 || 3, 7 | Pr. Cr. 437.56
1899 || 3, 7 | P. W. 46.791
I 9oo 3, .. 7 — ‘799
190 I 3, 7 — '82 Is
I 9oz *- •882
I903 — '95o
1904 || 3, 6 — 47' 526
I905 || 3, 7 -º- 48°42O
1906 || 3, 6 ºm- '422
1907 || 3, 7 || Sph. Cr. 434
I 908 || 3, 7 P. W. ‘584
I 909 || 3, 7 ºma- '663
191o & *- '669
I 9 II | 3, 7 ºs- •672
1912 3, 7 || Sph. Cr. '677
I 9 I 3 || 3, 7 — •682
1914 || 3, 7 | P. W. 49:483
I 9 I 5 || 3, 7 tº- 5 I 52 I
1916 *- '898
I917 — ‘909
1918 º 52'73 I
1919 º ‘791
I 92O * 53.526
I 92. I e — ‘540
I 922 a — '600
I 923 tº- '606
I 92.4 * '698
I 92.5 Sph. Cr. 54:398
1926 P. W. '400
I 927 * ‘409
1928 tº- *472
Notes.
Bright sunshine.
A, yellow; B, purplish yellow. At times admirably seen; unusually
favourable. - -
At times very well seen. Clouded and precluded obs. of distance.
Clouded.
The object is beautifully seen at times.
Obs. taken about 30" past moon. Clouded.
Taken at 30m past noon. The small >k is at times well seen.
Perfectly well seen ; quite tranquil, with scarcely any light round A.
Both yellow. Beautifully defined; might very fine.
Well seen at times, but often very tremulous.
Occasionally very well seen. The ring round A falls entirely within B.
A, light yellow ; B, deeper yellow or orange. At times beautifully seen.
A, pale yellow ; B, brownish yellow. At times capitally seen.
Admirably seen, and pretty steady.
With perforated whole aperture. Stars very unsteady.
A, yellow ; B, brownish yellow. Air unfavourable.
A, pale yellow ; B, brownish yellow. Occasional good views. Clouded.
A, yellow ; B, pale red. Well seen in general.
A, pale yellow; B, ruddy yellow.
Air not sufficiently good.
Daylight. Star beautifully seen at times.
Air not favourable.
Admirably seen, and at times pretty steady. . By daylight.
Beautifully defined and steady during obs, of pos.; but became hazy
and confused. - -
Usually very well seen and steady.
Well seen at times.
Vision is good at times.
By twilight.
With Alvan Clark's 73-in. object glass.
SCCI).
Same telescope. At times capitally seen, but sadly unsteady.
Very well seen and pretty steady.
Very unsteady, but pretty well
Same telescope. Sometimes splendidly shown, but not very steady.
Same tel. Air not sufficiently favourable.
248 Rev. W. R. DAWEs, Catalogue of

g? # +s º § ă +s e
No. Designation. ### i. sº | Position. # # ; - # # § ;
35. # 3. P- ſº É ;: P+
1929 & Herculis 2084 ić 3; 38 53 7 74°9. 5 || 3 I | 630 | #423 4 | I 5 || 63o
rose (continued) * @ ... | 73°53 || 5 || 38 || 5oo | I'583 || 6 || 47 || 5oo
1931 |Herculisi 67B 2107 |16 45 54|61 5 | 16123 || 5 || 15 || 320 ©
1932 162. Io || 5 || 14 || 320 e e e e
1933 162-62 || 5 || 19 || 320 | 1.268 || 4 || 8 || 320
I934 I62-25 || 3 || 7 || 420 -
I935 17o'o8 || 3 || 12 || 467 || I'232 || 4 || Io 467
1936 175.70 || 3 | 16 || 404 ||[o’934]| 4 || 12 | 404
I937 * - 17872 || 5 || 32 5oo || 1: 129 || 6 || 3o 5oo
1938| P. XVI. 270 || 2 I 14 |16 54 47|81 20 | 1.43°38 || 3 | 18 435 | 1.4+
1939| 20 Draconis || 2 | 18 |16 55 41| 24 44 242-93 || 3 | 12 320 tº dº
I94o 239'o6 || 5 | I 3 || 48o o'599 || 6 || 15 || 480
I94. I , 24o'58 || 7 || 32 || 357 || O'634 || 4 || 8 || 357
I942 tº e © e 245' 39 || 7 || 17 | 5oo o°613 || 4 || 4 || 5oo |
1943|Herculisz I oB 2120 |16 58 49 61 42 || 346.63 || 6 || 18 320 || 3-ol 1 || 10 || 3o 320
1944. 346.83 || 5 | I 5 || 320
I945 347'5o || 5 || 19 || 32 o || 2:908 || 4 || 12 || 320
1946 342.37 || 3 | | | | 3ool 2,748 || 4 || 16 || 3oo
I947 338°78 || 2 || 13 || 3oo
I948 * 338-65 || 5 || 38 3oo
I949 337'90 || 6 || 27 | 3oo 3’oest. . .
I95o 323'oZ || 3 || 14 || 375 || 2:33 I | 4 || 12 375
I 95 I 322°57 || 5 || 34 375 || 2:296 || 4 || 19 || 375
1952. A Draconis || 2 130 |17 2 14 35 20 | 19°o 5 || 3 || Io 320 - c.
Io 53 1862 || 5 || 3 || || 420 || 3:09.1 || 6 || 45 420
I 954. o 13:02 || 5 || 31 375 || 3:088 || 6 || 42 375
I955 tº e tº tº tº º 8'oZ || 3 || 23 5oo || 2 879 || 4 || 27 | 5oo
1956 36 Ophiuchi 17 6 81 16 23 2 19:13 || 5 || 19 185 || 4:919 || 4 || 16 || 185
I 957 2 18:07 || 4 || 13 || 3oo tº ſº
1958 . . . 21997 || 5 || 25 | 185 || 4,671 || 4 || 19 185
1959, a Herculis 214o 17 7 49|75 26 || 1 1793 || 5 || 33 375 || 4:432 || 4 || 22 375
Micrometrical Measurements of Double Stars.
249
E ă. Epoch
No. # s 18oo + Notes.
.9 f
>. >
I929 tº gº P. W. 54-55o | Same telescope. Air bad. -
I 93o e tº tºº •66o | Same tel. Bright sunshine. Star at times admirably seen and pretty
* steady.
1931 | 8, 9 gºmºg 4O'592 | Herculis 167 B. Transiently well divided.
I 932 || 7, tºº ‘7 I 3 | Both stars very white. Vision bad.
I933 || 7, = ‘764 || Both white.
I 934 * gºmº 42'68o | Vision very bad.
1935 6%, 9 º 48 434 || Both white. Air disturbed and stars much furred.
g With Alvan Clark's 73-in.object-glass. The small >k is very delicate when
I 936 tº e Sph. Cr. 54’398 the image is double. Obs. not very good. Dist. Scale rather uncertain.
1937| 7-0, 8.5 | P. W. ‘51 5 | Same telescope. Indifferent circumstances.
1938 6}, 7% s=== 47:63 3 | P. xvi. 270. Both stars white. Webs too thick for good distances.
3-ºxº- ſº 20 Draconis. Very poor vision. The northern star thought to be rather
I 939| 7, 7 4O 769 the smaller. -
I94o º º 54'8o 5 With Alvan Clark’s 73-in. object-glass. Night unfavourable.
I94. I ſº '808 || Same telescope. The night does not well bear sufficient power.
1942 || 7-4, 7-6 $º '828 || Same telescope. Air bad.
I 943 7, Io tºmº 40-466 | Herculis 210 B. A., yellow; B, bluish.
I 944 7, II sº ‘592 || A, yellow; B, blue. Vision very bad.
I945 7, Io § º 712 | Difficult.
1946|| 8, Io * 42-532 Obs. moderately good.
1947 7, Io gºmº 43°472 A, white; B, reddish 3
1948 8, Io tº-º ‘5 15 A, yellow; B, blue. Occasional good views.
I 949 || 7, Io * •61 I At times tolerably well seen.
1950 7}, 9% tºº 48-5 24 A, pale yellow ; B, blue. Disks diffused, and B is often faint.
1951 | 73, 9% — | 561 | A, yellow ; B, purple. Fine night.
I952 6, 6 wº 4 o' 5 26 a Draconis. Vision is too bad for measures of distance.
1953| 6, 6 sº '646 || Tolerably good circumstances.
& Both white. At times beautifully seen. The southern star seems a trifle
I954 || 5 +, 5 * 48° 524 the smaller. A d. b
sº tº With Alvan Clark's 73-in. object-glass. Air not good, but great care
I955 54 696 bestowed.
1956| 5, 5 tº- 4 I 529 || 36 Ophiuchi. Both stars straw-coloured.
| 1957| 5, 5 &ºm=º • 570 | Both white. Air bad; disks much diffused.
1958, 5}, 5% tºº -652 | Both yellow. Very unsteady and ill defined. -
1959| 3%, 7 * = } 48-491 || 2 Herculis. A, reddish yellow; B, green. Stars furred and dancing,
ROYAL ASTRON. Soc. VoI. XXXV.
K. K.
250 Rev. W. R. DAWEs, Catalogue of


gº º # +5 § # +5
No. Designation. # ... * Position. # # - : # i # :
h In O / O •=- //
1960 a Herculis 2140 |17 7 49| 75 26 | I 19°og | 5 || 35 | 5oo || 4:659 || 4 || 23 5oo
1961 (continued) e tº I 18:35 | 5 || 33 || 375 4.817 || 4 || 26 || 375
1962 | p Herculis 2161 |17 18 31|| 52 43 || 308'95 || 3 || 17 | 420 || 3-773 || 4 || 22 || 420
1963 - 3O8'38 || 5 || 42 322 || 3'853 || 4 || 27 | 322
1964 3.09°78 || 5 || 35 | 375 || 3°75o | Io 63 || 375
1965 tº º . . . .308'92 || 5 || 45 || 353 || 3°784 || 6 || 45 || 353
1966|| B.A.C. 59 Io 2 173 |17 22 41| 9o 56 | 167'o8 || 5 || 16 || 320 | of 5 est. . . . . .
1967 - 166.83 || 5 || 22 #. O'714 || 4 || 8 || 42O
1968 168°53 || 2 | 12 || 420
1969 & 164: o3 | I 2 42O
1970 163-62 || 4 || 28 420 o'75 est. ..
I971 162°43 || 3 || II 420
1972 162°o2 | 6 || 24 || 3oo o’9 est. . .
I973 159-63 || 1 || 3 || 420
1974 16ozo || 6 || 18 || 420 || O'9 est. ...
1975 16o’93 || 6 || 32 : o’9 est. . .
1976 16o'83 || 5 || 2 I 420 o'9 est. . .
I977 161'97 || 7 || 3o 420 || O'9 est. . . . . . -
1978 tº º º º I 59'45 2 8 || 435 | 1:106 || 2 || 6 || 435
1979| 53 Ophiuchi 17 27 3o 8o 18 || 191'50 || 3 || 23 || 375 || 41' 372 || 4 || 26 || 375
198o 191'62 || 3 || 2 || || 375 |41'58o || 6 || 34 || 375
1981 191°37 || 5 || 4o 252 |41'558 || 6 || 44 || 252
1982 Anonyma. 22.54|17 52 4| 77 33 265'8o || 5 || 20 | 190 || 3°o est. . . 190
1983 e Q • ‘º 264'47 || 6 || 12 || 190 || 3’o est. . 190
1984 t Ophiuchi 2262 |17 54 55||98 Io 222’68 || 5 || 15 6oo o°7 est. . . . . .
1985 222'o'7 || 5 || 24 || 6oo o'88o | 6 | 18 420
| 1986 220-77 |Io 44 || 6oo
1987 22 I '73 || 5 || 20 | 32O
1988 22 o'55 || 3 | I O || 42O
1989 227°47 || 5 | I I 42O © C º º
I990 225'72 | 8 || 5 | #. o'790 || 6 || 26 || 420
Micrometrical Measurements of Double Stars.
25 I

g # Epoch
No. # É 18oo + . Notes.
> >
1960 3%, 7 P. W. 48°5 ſo | A, orange; B, green. Dancing and flashy; clouding.
1961 3%, 7 tº- ‘565 | A, reddish yellow; B, deep green.
1962 || 4, 6 - |4O'832 e Herculis. Daylight.
1963 4, 5 º- 47-480 | Both stars white. Well seen.
I 964 3%, 4% - 48° 5 I 3 | Both very white,
1965 || 4, 5 tº- 53.767 | The stars seen beautifully between flying clouds.
I 966 tº c tº- 40'466 22173. Only just elongated.
I 967 7, 7 - 4 I •6 35 | Both stars deep yellow. Almost separated by daylight.
1968 7%, 7% *- •6 52 | Golden. At best deeply notched.
1969| 7%, 7% *- 42°537 || Scarcely elongated.
1970 7, 7 *- '671 | Golden. The disks are occasionally just separated.
1971 7 #, 7% - '68o | Both light yellow. -
1972 7, 7 - 43°483 Both yellow. By glimpses the disks are separated.
1973| 8, 8 e- '49 I | Both deep yellow. Never separated.
I974 7, 7 tºmº '496 || Both deep yellow. Seldom separated.
I975 || 7, 7 *- 515 Occasional good views.
1976|| 7, 7 *-8 ‘58 I | Occasionally separated.
1977 7, 7 tº- '606 | Both yellow.
1978| 6, 6--| Sph. Cr. 48.450 | The air is not good enough at this altitude.
1979| 5}, 8 P. W. 48-497 53 Ophiuchi. A, light yellow; B, pale blue.
1980 6, 8 *- ‘529 A. light yellow ; B, purple.
1981 5, 8 ºs- ‘55 I A, pale yellow ; B, light blue.
1982 8%, 9 *- 43°483 | * *...* stars white. Diffused and faint. Magnitudes variable and
1983 º ºmmº- '505 | White stars; greatly diffused and variable in brightness. A very small
star, P = 50°-E; D = 30" +.
1984 6%, 7 º- 40-639 + Ophiuchi. At best, deeply notched : almost in contact.
1985| 6, 6% - '660 | Sometimes well seem and steady.
1986 5, 6 tºº- '674 || Vision bad; yet the stars are generally quite separated.
1987 wº tº- •764 Daylight. Disks usually separated, but ill defined and unsteady.
i 988 || 6, 6% - 41'529 | Both white. Star seldom divided.
1989 6, tº- '644 || Vision very bad. Star seldom divided.
1990 | 6, - '652 | Favourable.
252 Rev. W. R. DAWEs, Catalogue of



z: # . | #
No. | Desigmati # ## # |NEP |p te # # | # # # # | #
O. esignation. # # 185o. 185o. OSitiOn. # # ſiº É # # #
1991 | 7 Ophiuchi 2262 17 s: 55 93 16 223 83 5 | 22 | 6oo ".
1992 (continued) 227 77 | 7 | 35 | 32o
1993 226 9o | 6 | 24 | 42o
1994 227'3o | 5 | 12 | 3oo | O'95est.| . .
1995 229'73 | 6 | 26 | 3oo |o'95 est. . .
1996 232 75 | 5 | 29 | 375 | I'ol I 6 | 19 375
1997 o e e e de o te & 238'o5 | 5 | 19 | 296 | 1'223 | 6 | 14 | 296
1998 95 Herculis | 2264 |17 55 868 24| 261 zo | 3 | 21 | 435 |6'294 | 4 | 29 | 435
1999 26o'95 | 5 | 3o | 375 | 6 176 | 4 | 22 | 375
2OOO De o en ºp 26o 2o | 2 | 16 | 353 | 6 I 17 4 | 3O | 353
zoo1 | 70 Ophiuchi | 2272 |17 57 52 87 27 | 125 87 |7 | 53 | 42o | 6:594 4 | 29 | 42O
2OO2 | * n 125'9o | 5 | 34 | 6oo | 6'498 4 | 23 | 6oo
2oo3 124 63 | 6 | 48 | 6oo |6-513 | 1o | 6o | 6oo
2oo4 125 o7 | 6 | 24 | 42o |6'833 4 | 16 | 32o
2oo 5 125'45 | 5 | 3o | 32o | 6'7o9 6 38 | 32o
2oo6 124 57 | 5 | 28 | 6oo | 6-651 6 | 21 | 6oo
2oo7 122 zo | 5 | 2o | 185 |6'736 6 | 25 320
2oo8 122'4o | 5 | 24 | 185 o ºp C. o
| 2oo9 124'43 | 5 | 38 | 32o | 6 637 | 1o | 76 | 32o
2O IO 123 93 | 3 | 21 | 42o | 6'5o1 | 4 | 2o | 420
2 O II 123'77 | 6 | 34 | 3oo | 6'566 | 4 | 17 | 3oo
zo 12 123'o3 | 6 | 42 | 42o |6 8or 6 | 35 | 42o
2o I 3 I 22'o2 | 3 | 2 I | 42o u op die ºp 1 e "Na
2O I 4 I 18:43 | 5 | 42 | 3oo |6'92 1 6 | 47 | 3oo
| 2o I 5 1 19:22 | 5 | 33 | 375 | 6-681 4 | 26 | 375
2o16 1 18'95 | 5 | 34 | 375 |6'741 | 6 | 36 | 375
2o17 I I 5'4 I | 3 | I2 | 375 de o
2o18 1 15:16 | 5 | 23 | 375 | 6'363 | 4 | 13 | 375
2o19 | 11476 |5 |45 | 353 |6'463 | 6 | 5o | 353
2 O 2 O 1 15-69 | 3 | 21 | 353 | 6-698 4 | 26 | 353
2O 2 I 1 14:45 | 3 | 21 | 268 | 6'433 4 | 29 | 268
Micrometrical Measurements of Double Stars.
253
E # Epoch
No. # É 18oo + Notes. • &
s: >
1991 || 6, 7 P. W. 41'669 || Vision indifferent.
1992 || 6%, 7 tºº ‘726 Seen double by glimpses only.
I993 º * 42-641 | Seen double by glimpses.
1994 | 6, 6% tºmº 43-609 | Seldom divided; vision very bad.
I995 2 6% tºº '61 I | Both white. Well separated at times; clear vacancy = } diam. of A.
1996 || 5, 6 smºs 48°663 | Both white. Very unsteady.
I997 6'o, 6-2 gº 54.67 I wº Clark’s 73-in. object-glass. Stars sadly confused and un-
1998 || 5, 5+| Sph. Cr. || 48450 | 95 Herculis. A, greenish white; B, pinkish yellow.
1999 || 5, 5+| P. W. ‘5 I 3 || A, light green; B, pale red.
2 OOO e e * 53°767 || A, greenish white; B, pale orange. *
2OO I 5, 7 tºº 39.606 || 7o Ophiuchi. A., yellow; B, blue. Very decided colours.
2 OO2 tº e *º ‘712 | Favourable.
2003 || 5, 8 gºmº 4o'57o | A, yellow; B, blue. Favourable.
2OO4. §ºmºsº 581 Obs, not very good. -
2OO 5 5, 7 tºº-ºº: ‘592 A, yellow; B, bluish green. *
2006 5, 7 ſºmºmº •62o | A, yellow; B, bluish green. Stars placed vertically by prism.
2OO7 5, 7 *mº 41'569 || Sunshine.
2008 || 4}, 6 *== } '591 Daylight. Stars placed vertically by prism.
2009 || 4%, 7 ºmºmº '731 | A, deep yellow; B, blue. Very favourable.
201 o 4, 7 tº- ‘799 || Same colours. :
2OI I 5, 7 tºº 42' 529 A, yellow; B, blue. Well seen during measures of angle.
2012 || 48, 7 *gº ‘537 A, yellow ; B, blue. Tolerably well seen at times.
2O I 3 5, 7 † = sº 43'472 A, yellow; B, blue. Sometimes pretty well seen.
2014 || 48, 7 *s 47'34.3 || A, yellow ; B, blue. Occasionally very well seen.
2015 || 4%, 7 tºmºs 48° 557 A, light yellow; B, purple. Not very favourable.
2016 * * : .669 | Very hazy, but otherwise favourable.
2017 te ! gmºmº 52.78o It is clouding, and the stars are very unsteady.
2d I 8 Hº * ‘791 | Sadly unsteady.
* 2O 19 s $º-º-º-º-º: 53-699 || At times admirably seen and steady.
2 O2 O 4. 7 º 720 | Neither well defined nor very steady.
2021 44, 6 tº-º-; ‘753 | Unsteady and flashy.
254. Rev. W. R. DAWEs, Catalogue of

nº à | 3 | .
|##|s|| R.A. |N.P.D. #| #| | | | | #| #| |
No. Designation. É & * | 1850. 1850. Position. ; ; & †: ; # &
*5. 3 a #
2022 || 7o Ophiuchi 2272 1% ; sº 8% 2% 1.14:19 5 || 35 | 353 ". e e I e º I e Q
2O23 (continued) I 13:99 || 5 || 38 268 || 6’471 || 6 || 38 268
2O24. I 13.61 || 5 || 34 5oo | 6′323 || 4 || 26 || 5oo
2O25 I 13.86 || 5 || 35 | 48o || 6′304 || 4 || 20 || 48o
2026 vº II 3'39 || 3 | 16 || 357 tº º tº tº
2027 tº º g º ... I I I 3 '83 || 5 || 27 | 357 || 6′374 || 6 || 3 | | 357
2028 || 72 Ophiuchi [342]|18 o 14|8o 27 || Single tº e
2029 | 73 Ophiuchi 2281 |18 2 7|86 2 || 255'55 || 3 || 15 320 || 1:408 || 4 || 12 || 320
2O3O 254'38 || 8 || 28 35o | I 573 || 8 || 27 | 35o
2O3 I 259'53 || 6 || 35 | 35o || 1:532 || 6 || 36 || 35o
2O32 tº Q tº gº ... 25497 || 3 || 27 | 375 || 1:38o || 6 || 46 || 375
2O33 Anonyma. [346]|18 8 55 70 16 || 327 I 5 || 5 || 25 {:}} 5:661 || 6 || 26 || 252
2O34. e e e G e - 327'34 || 5 || 41 || 353 || 5'773 || 4 || 32 || 353
2035 | Anonyma 2309||18 14 1| 64 32 || 350-28 || 3 || 13 185 || 3:736 || 6 || | 3 | 185
2036 .. 352'45 I | 2 || 3oo -: '
2O37 35o 12 || 7 || 3o 190 || 2°5 est. . . I90
2038 © Q 35o'53 || 5 || Io 3OO || 3°o est. . . 3Oo
2039 || 2 I Sagittarii 18 16 25|I Io 37 292 oz 7 || 3 I {...} 2'44o || 4 | I 3 | 200
204o T A. C. Io 294'92 || 3 || 9 || 200 || 2'454 || 4 || 10 | 353
2O4. I | A. C. I I 18 17 I I 91 39 || 176-63 || 5 || 14 5oo o'4 est. . . 5oo
2O42 tº º tº º tº º 179°38 || 5 | 16 || 48o o°4 est. . . 48o
2043 59 Serpentis 23.16||18 19 32|89 53 || 313.8o || 3 | 16 || 3oo || 3:941 || 4 || 20 | 3oo
2O44 || Anonyma 2319||18 21 12|7o 48 || 191° 13 || 3 || 15 375 || 5'684 || 6 || 23 252
2O45 || || Draconis [353]|18 22 54 18 45 || 67.72 || 3 || 8 || 467 o°6 est. ... | 3 || 467
2O46|| Anonyma 2329 |18 24 8|83 38 || 45-35 | 3 || 17 | 375 || 4: I 55 || 4 || 24 || 375
2O47 | Anonyma. [358]|18 29 13|73 8 || 2 18-62 || 5 || 36 375 | I 185 || 4 || 27 | 375
2048 || P: XVIII. 132|[359]|18 29 18|66 31 || 175-73 || 5 || 33 || 375 o'696 || Io 23 375
2O49 };}|s|33 ||375 o” 6|| 4 |375
2O5o 179'65 || 3 || 22 || 353 o°6 est. . . . 2 | 353
2O5 I tº e tº º 177:20 | 5 | 18 || 5oo o'605 I2 5oo
2052 | Anonyma 2360 |18 32 54|69 12 || 359'92 || 3 || 23 268 || 2-634 || 4 || 23 268
Micrometrical Measurements of Double Stars. 255

§ §
f # Epoch
No. #, 9 18oo + Notes.
CŞ .8
>. >
2022 e - P. W. 53-835 | Clouded.
2O23 e tº tº- '873 Daylight : favourable.
2O24. © º 54.672 With Alvan Clark's 73-in. object-glass. The stars are very flashy and
unsteady. º
2O25 *=º ‘736 | Same telescope. Stars diffused and very unsteady. Wind easterly.
2026 e - tºmº ‘767 | Same telescope. Became cloudy.
2027 e e tºm- ‘775 | Same telescope. Unfavourable.
2028 * 72 Ophiuchi. I have never been able to perceive any close companion
• * e to this star.
2O29 || 6, 7 ºmºms 41-578 | 73 Ophiuchi. Air not very favourable.
2O3o 6, 8 Pr. Cr. 43-622 | Very unsteady.
203 I 6, 8 * '625 || Occasionally pretty well seen.
2032 6, 7} | P. W. 49:477 || A, yellow; B, lilac Well seen in general.
2O33 || 8%, 9 tº sºme 48° 546 O > 346. Both white. Disks much diffused, and therefore too faint with
375. -
2O34 || 8, 8% amº 537 I 5 Both stars yellow. Night favourable.
2O35 | 8%, 9 * 41-578 | x 2309. Pos, tolerable; Dist. bad.
2036 & -º- 43.472 | Very bad circumstances. Trustworthy measures cannot be procured.
2O37 || 9, 9-H -º-, ‘5 I6 | Both very white. Occasional good views, but sadly transient.
2O38 || 9, 9} *E=E. ‘609 || Air thick, and stars extremely faint.
21 Sagittarii. Discovered to be double by Mr. Alyan Clark, of Boston, U.S. A, light
2O39 5, 8% ºsmº 53-699 #: B, . When best seen the small star bears a good illumination.
t e
2O4·O 5, 8 *= 717 A, º Air not very favourable; yet the º: ºshows º small
A. C. II. This star is Bessel (Wei . 391, and L. . Di to b
2O4. I 7 #, 7; - 5 4-65 8 ăii, by i. Aºi. ãº, ſ: º:#. *ěj §A.é. §:
glass. Object extremely delicate. Air not good enough.
2O42 7'o, 7-2 º ‘739 Same telescope. Unsteady, but at times sharply defined. Scarcely notched, but
very decidedly elongated.
2043 6, 9 *- 40-693 59 Serpentis. A, yellow; B, very blue.
º x 2319. Both stars pink. A smaller k C, Io; mag. The air is
2O44- º tº-mº 49469 unfavourable.
2O4·5 ºsmºms 53-88 p Draconis. Night unusually brilliant, but the stars are flashy and
º 3'887 unsteady.
2O46 | 8, 9% - 49'477 | x 2329. A, yellow ; B, blue.
2O47 | 7, 7% º 48° 561 ox 358. Both very white; an elegant object, well seen.
2O48 7, 7+ * 48° 546 | P. xviii. 132. Both yellow ; in pretty firm contact.
- º Both light yellow. Disks in firm contact. The northern thought to be
2O49 || 73 +, 7% -º-º: 561 a trifle the smaller.
- © Both white. Well seen at times, and then the elongated disk is decidedl
2O5o 6%, 7 *_ 53°717 ‘. - ) g y
2O & I | 6’ "O ºms •6 With Alvan Clark’s 73-in. object-glass. When best seen the disks are
- s 7, 7 54'095 in loose contact, but the air is not good enough.
2052 | 8:o, 8.6 tº-º-º: 53°754 | x 2360. A, pale yellow; B, lilac. Air not very favourable.
256 Rev. W. R. DAWEs, Catalogue of



# R.A. | N.P.D # # +. à # # H
No. Designation. #. sº. sº Position. | ; ; É # ; ; & É
l— O O
h m S O M O * // mºmº-mº ºmºmºmºsºmsm ºmºmº-
2053 Tau. Pon. 75 B 2.375 |18 38 6|84 39|| 1 || 1:48 || 5 || 3o 375 || 2:072 || 4 || 23 375
| 2054 || Anonyma 2384 |18 38 35|23 2 || 309:62 || 4 || 14 || 320 o'75
2O55 31478 || 5 || 15 320 o'7
2056 314.75 || 3 || 8 || 320 || O'6
2O57 * e º e 332-88 3 3 {:} o:35 est] . . . I 5oo
2058 s, 4 Lyrae 2382 |18 39 22 50 29| 21'45 || 5 || 17 | 320 || 3:319 || 6 | 18 || 320
2O59 2 I-40 || 3 | 16 || 32O || 3:287 || 4 || 2 || || 320
2060 22° 52 || 3 || 20 32O || 3:238 || 4 || 28 || 32O
zoöI 22:45 || 3 || 26 || 320 || 3’ I 59 || 4 || 3 || || 320
2O62 21-63 || 3 || 24 || 320 || 3:298 || 6 || 37 || 320
2O63 2 I '72 || 5 || 47 640 || 3: 168 || Io 79 || 64o
2064 2 I ‘O7 || 5 || 32 || 375 || 3' I 99 || 4 || 20 || 375
| 2065 2 I 33 || 5 || 4o 375 || 3'284 || 2 || 14 || 375
2066 2 I '73 || 5 || 4o 375 || 3'o65 || 4 || 3 I | 375
2067 zo'78 || 5 || 43 || 467 || 3:245 || 4 || 28 || 467
2068 20° 13 || 5 || 38 || 467 || 3' 169 || 4 || 31 467
2069 19-48 || 3 || 26 || 480 || 3:059 || 4 || 33 || 48o
2070 1995 || 5 || 35 | 630 || 3’ I 59 || 4 || 27 | 63o
2O71 1925 || 5 || 4o 390 || 3:099 || 6 || 46 || 390
2O72 1973 || 5 || 39 || 5oo || 3' 179 || 6 || 46 5oo
2O73 19:53 || 5 || 38 203 || 3:03.1 | 6 || 41 | 203
2O74 tº gº tº e 19'63 || 5 || 38 203 || 3:03.1 || 4 || 3o 203
2O75 | E, 5 Lyrae 2383 |18 39 24 5o 33 || 1 52'4o || 5 || 15 32 o || 2:497 || 4 || 9 || 320
2076 I 53' Io || 6 || 24 || 320 || 2:62 I | 4 || 17 | 320
2077 1 5 I '72 || 3 || 20 | 320 || 2:625 || 4 || 19 || 320
2078 I 5.1°97 || 3 || 23 || 320 || 2:661 || 4 || 32 || 320
2O79 149'98 || 5 || 4 || || 64o || 2:441 || 4 || 22 || 64o
208o 2'444 || 6 || 3o 475
zo.8 I 149'03 || 5 || 29 || 375 || 2:587 || 4 || 3 || || 375
2O82 148.82 || 3 || 26 || 375 || 2:594 || 6 || 56 || 375
zo83 14775 || 5 || 39 || 467 || 2:418 || 6 || 44 || 467
Micrometrical Measurements of Double Stars.
257
No. # #
§ §
2053 || 63, 6; P. W.
2O54 8, 9 —
2O55 | 73, 9 tºº-º-º:
zo;6|| 8, 8 tº-º-e
2O57 8 *ºn
2058 6, 7 tºmmº
2059 || 6, 7 tºº
2060 | 6%, 7% º
2061 6, 7% º
2062 6, 7 tºmº
2063 6, 7 tºº
2064 6, 7 tºmº
2O65 5%, 7 ſº
2066 tº º —
2067 6, 7 º
2068 || 6, sº
2069 tº ºt *g
2070 e &==º
207 I tº Q tº
2O72 ge º Hºmº
2O73 o Sph. Cr.
2O74 tº ſº *g
2075 6, 6–– P. W.
2O76 | 6, 6--| —
2077 6, 6--| —
2078 || 6, 6--| —
2079 6, 6% * = *
2O8o Sph. Cr.
2081 6, 64. P. W.
2082 sº, sí || –
2083 || 6, 6-1-1 —
Epoch
I 8oo + Notes.
48°557 | Tauri Pon. 75 B. Both very white.
4o'783 | x 2384. By rare glimpses just divided.
'82 I | Excessively difficult from unsteadiness.
41°802 || At best scarcely notched.
54'83o With Alvan Clark’s 73-in. object-glass. The star is so nearly round that
I cannot be quite sure of any elongation. Twilight.
4O’7 I 3 || 5, 4 Lyrae. The stars are very badly defined.
‘729 || A, pale yellow; B, reddish yellow.
41-627 | Both reddish. -
'690 A, light red, or orange; B, purplish red. Favourable.
‘743 A, yellow; B, purplish.
46 '95o | Capital vision in general.
48° 524 || A, yellow; B, reddish.
‘565 | A, reddish; B. purple. Suddenly clouded.
*663 | Stars placed horizontally in eastern azimuth.
537 Io A, yellow; B, purplish. Admirably seen at times.
72O | A, yellow ; B, purplish. Good vision.
54'554 With Alvan Clark's 73-in. object-glass. Pretty steady, and very well
See Il.
‘559 || Same telescope. Unsteady and often glimmering.
‘827 | Same telescope. Usually well seen, and pretty steady.
‘83o | Same telescope. At times pretty steady, and well seen.
'838 | Same telescope. Rather favourable.
‘843 | Same telescope. A, yellow; B, purplish. Not very favourable.
4O7I 3 || s, 5 Lyrae. Very ill defined.
‘729 || Very unsteady.
41-627 | Both stars white.
'690 | Both straw-coloured. Favourable.
6.ogo | Both white: At first well seem and steady, but became very tremulous
40’95 during obs. of dist.
47.635 | The half-distance measured. -
48° 524 || Both very white. At times well seen.
• 56 Very white stars. Night very brilliant. The stars are furred, but
505 pretty steady.
53'709 || Admirably seen in general.
Roy AL ASTRON. Soc. Vol. XXXV.
L L
fo on 5070700 sq.AVOI “I ‘M Aoû 852


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§ #: § - § § g # - q:d'N | vº #:
Micrometrical Measurements of Double Stars. 259

E Q) Epoch
& g H
No. § É 18oo + Notes.
> § *
2084 6, 6-F| P. W. 53°715 Both white, well defined and pretty steady.
2085 * @ ºmmºng 54-554 With Alvan Clark's 73-in. object-glass. Stars glimmering and not very
steady.
2O86 tº º — ‘559 Same telescope. Stars unsteady, but at times well seen.
2087 & º tºmºmº '827 | Same telescope. Daylight. Stars well seen and pretty steady.
2O88 º º tºº '83o | Same telescope. Stars sweetly defined and very steady.
2089 * † Sph. Cr. '838 || Same telescope. Daylight.
2090 5'5, 5-6 gº ‘843 | Same telescope. Both stars very white. Air unfavourable.
209 I | 4}, 6 P. W. 48°491 & Lyrae, A, pale yellow ; B, purplish. Not very favourable.
2092 43, 6 * ‘529 || A, yellow; B, purple. Unsteady and usually ill defined.
* A, light yellow ; B, pale purple. Brilliant and rather favourable,
2093 || 44, 6 tºº, 647 'though 8. thunder-stºrm is passing along the S.E. horizon.
2094. ºn tº tº . 39°759 || Draconis 203 B. Circumstances are too unfavourable for this object.
2095 || 4, 7% $º 48-497 || 3 Lyrae A and B. A., pale yellow ; B, light blue. Night fine.
º A, very pale yellow ; B, pale lilac. Rather favourable, though a thun-
2096 3%, 8 tºmº 647 'der tºrm is in the S.E. horizon. I
*mº ſº O > 525. Extremely difficult. This is about the most difficult object
2O97 || 5, II 53-718 could measure with this telescope, and nearly the min. vis.
2098 || 8, (12) tºº-ºº-ºº 41'529 | * *429. A, yellow; B, blue. (The mag. of the small star is much
2 underrated ; it is nearer Io m.)
2099 || 7%, 8 ºsmºsº 41°802 | P. xviii. 287. Very difficult.
2 I oo 5, Io; iſºmº 48° 55 I | 17 Lyrae, A, yellowish ; B, blue. Elegant object.
2 Iol 7, 9% {-º 48° 5 Io | x 2470. A, white; B, lilac 2
* º Both white. The mag. and colours were re-examined 24 June, 1849
2 I O2 7, 7% gº 55 I and found A = 7, white; B = 8*, pale lilac. y y
| 2 IO3 8%, I O *== 53.71 5 | * 2488. A, white; B, purplish 2 The small star is rather faint with
sufficient illumination.
2 Io4 || 6%, 7 — 537'5 ox 371. Both very white; just meatly separated. A very pretty object,
2 IoS 8, 9 * 40-641 | x 2491. Extremely difficult.
2 Ioë | 93, 1 I * 4 I'745 Obs. tolerable.
2 Io'ſ 9%, I I ammº ‘8oz | Bad night. Obs. poor.
2 Io9 || 7%, 7%| — 4o'58 I | x 2523. Both stars very white.
2 Io9 || 7%, 7% *gººmsº 40.62o | Cygni 22 B. Circumstances not sufficiently good.
2 I Io | 73, 9 gºsº 48° 561 ox 378. Both white. Clouded.
2 I I I 7%, 9% Sph. Cr. '682 | Disks much diffused and very unsteady.
2 I 12 || 7%, 9}| P. W. 53°767 || A, white; B, lilac Very well seen at first, but became cloudy.
21 13 | 6}, 7 ºmºmºm. 48° 561 | x Aquilae. Both yellow. At best wedge-shaped. Air not good enough.
2 I I 4 6, 7 tºº iº 576 Yellow stars. A wedge-shaped elongation.
ſo an āoſogoO ‘SIMVOI “I M. Aeºſ C97.


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Micrometrical Measurements of Double Stars. ...”
261

£ # Epoch
No. § § 18oo + Notes.
>. >
2 I 15 6, 6% | P. W. 48-674 | Both yellow. Perforated whole aperture. Night good.
- d º Obs. at Starfield, with Mr. L ll’ -foot Newtonian, rt. duced
2 I 16 6 #, 7 Sph . Cr. 69 8 inches. *: º:º i. tº: : ſº . § ...:* I4
6 tº- º At best a slightly notched elongation. I have never detected O 2's third
21 17| 6, 6% P. W. 53.699 star at 1” 5 dist.
21 18| 6, 6% Wºm ‘718 Obviously elongated at times.
2 I 19 7'4, 8'5 --> 53°72 I | O2 383. A neat and pretty object.
2 I 20 | 7°4, 8' 5 ºmmº ‘758 A, white; B, lilac Ż
2 I 2 I 7, 8 ºsmºs 48-546 oz 384. Well divided when best seen; vacancy = } A = } B.
21 22 || 7%, 8 --> '664 | Both white. At times well seen.
21 23| 7%, 7% -g 53°72 I | White stars, well separated.
2 I 24 tº tº -> ‘759 | Became hazy, and soon clouded.
2 I 25 || 23, 9 ammº 39'636 || 3 Cygni. Too unsteady for distances.
2126|| 23, 8% -sº '68o | A, white; B, slightly blue.
2 I 27 | 3, 9 -ms 4o'636 A, yellowish; B, blue.
2 I 28 3, 9 --- ‘784 || A, yellow ; B, blue.
2 I 29 e - mºs 4I '73 I | Well seen by glimpses.
| 2 I 3O || 3, 9 -º- ’743 | Well separated by glimpses.
ºsmº o A pale yellow; B, blue. Daylight. Bad vision; measures of dist, cannot
2 I 3 I 3, 9 942 fe obtained. " 3. \
2 I 2 2. t-sº or 8 || A, light yellow ; B, blue. Twilight. Occasionally well seen and mea-
3 3, 9 95 sured satisfactorily. - j
2 I 33 3, 9 - 46'791 || Occasionally well seen.
2 I 34 3, 8 -* 47°o3O | Though the star is unsteady, the higher power is the best for it.
2 I 35 | 3, 8 *mmº ‘893 || The air is greatly disturbed.
2 136|| 3, 8 -> 48°663 || A, white; B, pale blue. At times well seen.
2 I 37 * '669 || Hazy, but the star is sometimes admirably seen.
- d. A, white; B, purplish. Very unsteady, but the small star is at times
2 I 38|| 3, 8 - 898 'well seen. y
2 I 39| 3, 8 * 5o'931 | A, pale yellow; B, blue. Sometimes remarkably well seen.
- º Sun shining brightly near the horizon. At times the star is remarkabl
2 e tº-mº g prigntly y
I 4o 5 I '994 well seen.
2 I 4. I & -º-ºmº 52.728 | Sometimes steady and well seen.
| 2 I 42 -ºne ‘79 I | Air clear, but unfavourable.
2I43 || 3, 8 -g 53-699 || Usually very well seen.
2 I 44. º * 1718 Not well seen; the star is flashy and unsteady. Thick fog suddenly
supervened. -
2 I 45 .* '767 || At times very well seen between passing clouds.
262 Rev. W. R. DAWEs, Catalogue Qf

- È 3 | R.A. | N.P.D. § | ä, | § ä | j | ä | §
: No. | Designation. jj* 185o. 185o. I Position. j È É É $ É É
O , cx
t —! O C.
- • h m sl o / O A'/
2 I 46 ę.) 2579 179 4o 17| 45 14 I 4*3o | 5 | 27 | 63o I 1-688 | 4 | 1 5 || 63o
2 1 47] T Aquilæ 2583 |I 9 4 I 38] 78 33 I 1 2 1*47. | 4 | 28 || 32o • • •.•
2 148] % Sagittæ 2585 |1 9 42 I 9] 7 I 14 I 3 12:33 | 3 | 18 | 3oo 18:9o2 4. | I 3 I 3oo
2 I 49 3 I 2 *o8 | 3 | I 3 | 3oo
2 I 5o «• «• 3 1 2*47 | 3 | 2 1 | 375 • •
2 1 5 I | Anonyma [386] [19 42 5o, 53 13 I 78:62 | 5 | 27 || 375 I o 967 || 4 | 12 | 375
2 1 52 | Anonyma [387]|1 9 43 9| 55 4 I 83-88 | 5 || 16 | 353 | o'5 est. 2 || 353
2 I 53 91:42 | 5 | 26 | 353 | o'6 est. 2 || 353
2 154 e ® - • • • e • 95* 23 || 3 9 | 5oo I o' 5 est. 2 | 5oo
2155] Anonyma [388] [19 46 4| 64 34 f. 13978 | 5 | 24 | 375 |3 854 | 4 | 17 || 375
2 I 56 - - - 139:98 | 3 | 2o || 2oo | .. e © I • • •
2 I 57 «• • o- • 1 39-43 | 5 || 37 | 296 | 3:888 4 | 26 || 296
2 1 58 | e Draconis | 26o3 |1 9 48 39] 2o 7 I 353* 17 || 4 | 1 o | 35o I 2:844 | 4 | 1 o || 35o
2 I 59 7- . • • 356:48 | 5 | 5o || 375 I 2:828 | 4 || 38 || 375
2 1 6o Berysip, AC 12|I 9 5o 35| 92 38 I 333*76 || 5 | 25 | 5oo I o'863 4 | I 2 | 5oo
2 161 | Anonyma | 26o6 || 19 52 45] 57 8 I I 327o | 5 || 33 | 435 I 1* I 91 | 4 | 14 | 435
2 I 62 e © � * - «• • I 32*88 | 5 || 4 I | 353 I 1 ' I 99 6 || 49 | 353
2 163 | 16 Vulpeculæ[395] 19 55 4o| 65 29 | 76-85 | 3 | 8 || 375 | o'6 est. 2 || 375
2 164 • • • • 82* 56 | 3 | 16 | 48o I o* 55 est. | . . | 3 | 48o
2 1 65 | Anonyma 2626 |1 9 58 16] 59 53 I I 22:4o | 3 | 9 || 353 || 1* 165 4 || 9 || 353
gg| P. xix. 396= 6 •
2 I I1 III. 63 2625 | 19 58 25] I o3 2 I I 3*45 | 2 5 || 32o
2167] Anonyma [398] 394 1 46 54 42 I 8478 | 5 || 3o | 353 I 1'o45 || 4 | 15 | 353
2 168] Anonyma 264o |2o 2 5 1| 26 32 | 23:28 | 5 | 27 ; 32o || 4*991 4. | 19 || 32o
2 I 69 | P. xx. 26 2644 |2o 4 56] 89 35 I 2o9'32 | 3 | 6 | 32o || 3'5 est.
2 1 7o - 2 I I ' 1 o | 3 | I 3 | 42o I 3*478 4. | I 7 || 42o
2 1 7 1 2o9*9o | 5 | 27 | 3oo I 3* 32 I 6l 4o I 3oo
2 1 72 • • 2 lo* 38 | 5 | 24 | 3oo || 4'o est. | . .
2 173 | Anonyma [399] 2o 5 1 o 53 24 I 279:65 || 6 i 47 | 353 I 4-6o3 | 4 | 29 || 353
2 I 74 ' • • ... | 279*73 || 5 || 19 || 357 I 4:627 || 6 || 17 || 357
2 175 | Anonyma [4oo] 2o 5 1 ol 46 28 || 32o* 55 | 5 || 19 || 353 I o. 65 est. | .. | 3 | 353
2 176 [P.xx. I 77, 178] 269o 2o 24 1| 79 I 5 I 256*o2 | 3 | 16 | 32o |1 4:635 || 4 | 18 | 42o
Micrometrical Measurements of Double Stars.
263

# # Epoch -
º O
No. # 3 18oo + Notes.
> >
2 146 tº º P. W. 54'56o With Alvan Clark's 7}-in. object-glass. Star very tremulous and flashy.
2147| 6, 6% - 4o'652 ºr Aquilae. Often pretty steady.
2 I 48 || 5, Io - 4. I'57O || @ Sagitae. A, yellow ; B, purple.
2149 | 6, 9 tº-sºmº 43.606 || A, white. Ill defined and unsteady.
2 I 5ol 6, , Io -* 48° 584 || A, yellow; B, purple. Clouded.
2 I 5 I | 8, 8 - 48-546 ox 386. Both stars white. Disks much diffused.
2 I 52 | 73, 8 *- 53.726 ox 387. Well elongated, but scarcely notched.
2 I 53 || 7-9, 8' I -*. '758 | Both white. Disk elongated, but scarcely ever notched. Night fine.
2 I 54 © e -º-e ‘769 |The night is not sufficiently good.
2 I 55 8, 8 -º- 48° 513 ox 388. Both white. Placed horizontally by prism. Diffused and faint.
2 I 56| 7%, 7% - 53.731 || The air will not bear power. Disks diffused.
º e -º- º With Alvan Clark’s 73-in. object-glass. Well seen and tolerably steady.
2 I 57 77, 7.8 54'72O A 3rd star P = I 38° -- ; D = 25" H-.
2 I 58 5, 8 Pr. Cr. 43°784 | * Draconis. A, yellow ; B, blue. Unfavourable.
º A, yellow ; B, purple. An exquisite picture, perfect miniature of s Bootis.
2 I 59 |4}, 8 P. W. 48 669 'Very fine night ~. -
Bessel (Weisse), xix. 1273. Discovered to be double by Alvan Clark, with whose
2 16o 7}, 8 -º- 5 4-6 5 8 73-in. ... º observations were made without any intimation of its
character from the discoverer.
2161 | 73, 83 || Sph. Cr. 48.677 | x 2606. Night not very favourable.
2162 || 7-9, 8' I P. W. 53.813 || Beautifully seen and very steady.
2163 6, 6 48 674 16 (h) ºccule. Both white. Pretty steadily elongated, sometimes
5 * notched.
º e -º- tº With Alvan Clark's 73-in. object-glass. Disks in firm contact. Well
2164 6-2, 6-2 54°557 seen and pretty steady.
2 I 65 8-6, 8-9 ºmº 53-887 2 2626. Air unfavourable;. star not well seen.
2 166|| 7, 12 - 41-617 | x 2625. A., yellow. -
2 I67 || 7-3, 9°o tº-mº 53°754 O 2 398. An elegant object; requires a better night.
2 168|| 7, 1 I -*º 4 I'8o3 | x 2640. Obs. pretty good.
2 169|(9, Io) º-sº 41-628 P. xx. 26. Cloudy and bad.
2 I 7o 7, 7+ --> '666 || Measures pretty good.
2 I 71 || 7, 7% *º- '873 || Both white. Sometimes well defined.
2 I 72 || 7, 7% cºmmas 43.61 I | Both very white. Rather tremulous.
2 173 || 7-8, 9'5 *º 53,754 ox 399. A, yellow; B, blue. Well seen at times.
- º º - .o, , . With Alvan Clark’s 73-in, object-glass. A., yellow; B, purplish 2 Night
2 I 74 7' 5, Io'o tº-sº 54 8 I9 unfavourable, and star.'. difficult. - , purp §
t e º O X 4oo. Not divided, but requires a better might than this, though
2175 | 8: 1, 8.4 -ms- 53-887 apparently splendid. - j g
e P. xx. 177, 178. Cloud d bad vision; yet th ller st i -
2 17 6 7}, 8 = 4O 822 㺠ºngº. §º ... § sº º:0.
single star. See measures of it below.
#92
ſo on 3oſoppo ‘SIMVOI “I M. Aesſ



oz+ | 61 | + | Z$ 1.9 1 oz} | $g $ z 1.9% 4ozz
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- O oo? 91 || 5 z 1.4 Iz 88 Iz
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oog | 91 || 9 || 86.602 58 Iz
Oog | 19 || 8 || z8.6oz e #81z
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- ozy I I | 5 || zł.8oz Q - I 8 Iz
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ozy z I z 88z.41 ozy | 1z £ oš.9% z - - (panwºgwoo) 841z
ozº | S I | # £z;” oz8 || ZI | 9. 48.9% 51 §4 º º o692 |841°441 xx'd 44 Iz
O 9 '5
; i f # 3. ; ; wouisoa I. º: s I º: 8 I 3. # # 'uogeußiseGI *ON
g H: # ă § # # q:d'N v's #
Micrometrical Measurements of Double Stars.
265
wº *
Gl) $8
- f # Epoch
No. # É I 8oo + Notes.
>. §
2 I 77 || 7, 8 P. W. 4o'843 Very unsteady and furred.
2178 8, 8% amº 41-630 || A, yellowish white; B, white.
2179 || 7, 8% — '691 | Both white. Sometimes well seen, and pretty steady.
g P. xx. 177. This is the star B of x 2690. The elongation is decided.
2 I 8o 9, 9 *=n 4O'822 The duplicity was not suspected by 2 at Dorpat.
2181 | 8%, 9 sºmºmº ‘832 | Bad circumstances.
2182 | 8%, 9 gººms ‘843 || Decidedly elongated, but scarcely notched.
2183 || 9, 93 *sº 41-630 Both white.
2184 || 9, 93 tº-ºn '691 Both white. A notched elongation.
- There is an exceedingly small star, whose dist, from A is about that of
2185 || 9, 9} -s ‘707 B, and pos. = 1 os” +.
2186 || 9, 9} ſº ’879 | Bad vision.
2 187 || 9, 9} tºmºmº ‘942 | Never well seen.
- tºmºmº ſº Elongation occasionally decided, but the night will not bear sufficiently
2188 || 9, 9} 958 high power. y
2189 8, 8% | Pr. Cr. 43°625 | Only occasionally elongated.
2190 || 9, 9} ſº '756 | Both white. At best a slightly notched disk.
2191 | 8, 8% | P. W. 46-808 || Stars very unsteady, but the elongation is best seen with the high power.
2 I 92 Q g== 53°7 Io Circumstances not good enough.
2 I 93 = ’876 Unfavourable, but when best seen the elongation is decided.
9 e Q With A. C.’s 73-in. object-glass. The night is not good. The distance
2 I 94 º * 54'82 I appears less than formerly. *
Vuipec. 94 B. With A. C.'s 73-inch object-glass, A, yellow ; B,
2 I 6 8} tºmºmº ſº wrplish 2 Pretty steady, but glimmering.
95 Å, 8% 54."734 stºops Stars well seen in general and steady. A, light yellow ;
21.96 || 6-8 8:3 tºº '748 B, purple.
2 197 8, 8% sº 41'529 > 2698. Both white.
2198 || 8, 8% tº '538 Night brilliant, but bad.
2199 || 9, 9} tº-º ‘726 | Pos. pretty good; Dist. poor.
22Oo 8, 9 Pr. Cr. 43.625 | Both yellowish. Occasional good glimpses amidst general confusion.
2, 2 O I © Q P. W. 54.696 with A. C.'s 73-in. object-glass. Hazy cloud rendered the stars faint.
22 O2 o Gºº 39:781 | x 2701. Pos, good; Dist. indifferent.
22O3 | 8, 9 * 41-666 | Pos. tolerable; Dist, unsatisfactory.
22O4 8, Io * 39783 | x 2708. Pretty steady and well defined.
22O5 tºmº ‘789 || Measures difficult.
2206 || 7, Io &- 40-647 Obs, good.
2207 || 7, Io tºº .666 | Pos. good; Dist. tolerable.

Roy AL ASTRON, SOC. WOL. XXXV.
M
M
Jo on.5opogoO ‘SIMVCI “I’M Aoºſ 99%



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49% z ' ' || 1so Z.o 49% zz | 5 || 98.801 |& #5 #8 1% oz|[; 1%) JuáAO Y |{{zz
962 of + | 849.4 962 $8 || 5 | #9.9% © e. e Q z£zz
962 | 62 | V | 818.4 || 962 zz £ ov.9% I £zz
£5% #8 || 4 || $44.4 | g $9 || $4 || 5 || 82.45% o? zz
oo? | 9 || z £8%.4 oo? | zz | + | oz.9% 6zzz
© tº tº e ozº z1 | 8 || 89.9% 822z
ozº | z1 | + | 844.4 oz8 || $ 1 || 8 || og.8% tº º Azzz
581 || 41 || 5 || oé.4% | 89 #4 |91 68 oz Sz/z ** 922z
$4% or | # | 64%. 1 || $48 £1 £ £4.48 e G e - e tº Szzz
• 'Asoo. 1 || 85% $ 1 || 8 || 1 1.88 |#1 84 |9% 48 oz ºz/z ſq 84 pupudioCI #222
$4% zz | V | 814.2 || $4% 92 || 5 | 89.6% © e Q tº tº gº £zzz
oo: 98 || 9 || 178.2 oog $8 || 5 || z8.8% ZZZZ
oS £ | 11 || 5 || 698.2 oS9 z1 || 5 || $5.0% IZZZ
oS £ £1 || 5 || $58.z ość z I $ og. 19 OZ ZZ
oo? | 61 | + | zo.oS 61 zz |
oz8 || 91 || 9 || 448.2 oz8 || 61 || 5 || 80.6% 8 Izz
oz8 || 62 || 9 || 484.z oz8 oz £ z8.6% 41zz
tº e © tº oz8 || $ 1 || 5 || z8.8% £1 85 |65 #8 oz 91/z JuáAO 64 |91zz
£$8 || + | z of $.o £5% $z $ $4./oz |45 6+ + $9 oz|[o 1+]| q 92 z ſu?AO | $1zz
£5% 1% | 9 || 8oo.91 || $5% £z £ z$.ołº © º tº º # Izz
oS £ 61 | S | SS Z.9 I oS9 || 61 || 5 | zo.złg £ Izz
oS £ 81 || 5 | of 9.8 I oS £ 81 || 5 | 89.2% g Z I ZZ
tº Q © º ozy o I | 9 || zo. Sº 2 I I ZZ
oo? | S I | z zz 5.9. I loog | 61 | £ $z.5% O I ZZ
ozº 82 | 9 || z£4.9 I ozº zz S Z6.5% (pomulguoo) 6ozz
ozº Iz | + 950, ozº | S I £ 44% ;: J; 2 ºf or 804Z bui/ſuouv | 8ozz
O O '5
; i f ; 3. à f 'uopisod ||. º: s: º: 3. 3. # # ‘uorºbujisaCI *ON
§ H. - # ; g g # CI’dſ' N. VºI te ;
Micrometrical Measurements of Double Stars.
267

2208
2209
2. 2 IO
22 I I
22 I 2
22 I 3
22 I 4
22 I 5
22 16
22 17
22 18
22 I 9
2, 22 O
222 I
22 22
2223
2224
2225
2226
2227
2228
2229
223O
223 I
2232
2233
22:34
2235
2236
2237
22.38
a tº
3 $ | . .
# # Epoch
# É 18oo + Notes.
> §
7, Io P. W. 40-699 || Obs. moderately good.
7, 9 tºº 4 I •6o 3 | Vision is too bad even for this star.
7, 9 *sº '669 || A, yellow; B, purplish
tº tº . The night is apparently splendid, but vision i t ly bad ; de-
7, 9 tºº 42'65o ... pp y splenua, but vision is extremely bad; no de
7, 9 | Pr. Cr. 43-851 | Stars ill defined. Assumed zero of distance.
8, Io . tºmsºmº ’873. Disks diffused. Assumed zero of distance.
tº º P. W. 53°824 || Hazy and unsteady.
6 tº e Cygni 226 B. Very decidedly elongated, and at best slightly notched.
#, 7 53.825 Hazy, and the estimated mags. are probably too small.
6, Io tºº 4O'734 || 49 Cygni. A., yellow; B, very blue.
6, 9 * . 4I '745 A, orange; B, blue.
*º '751 Unfavourable.
7, 9 •= 43°718 A, yellow ; B, blue. Bad vision.
6, Io Pr. Cr. ‘851 | The air is extremely unfavourable. Assumed zero of distance.
7, Io - ‘865 A, yellow; B, bluish. Very ill defined. Assumed zero of distance.
6, 8% | P. W. 47.914 A, yellow; B, blue. Night unfavourable.
6, 9 == 5 3769 | A, yellow ; B, blue. Pretty good vision.
ºsmº 53°7 I 3 || Delphini 43 B. Thickening haze extinguished the stars.
tº º *º 769 || Unsteady and much diffused.
7, 8 º 4o'581 | x 2725. Unfavourable.
8, 8% º '699 || A, orange; B, blue.
8, 8% Eº 41-617 | Pos. pretty good.
7%, 8 ºs '633 || A, yellow; B, blue. .
7-8, 8.3 ſººn 53'813 || Almost perfectly steady, and beautifully defined.
{º} 54.696 With A. C.'s 73-in. object-glass. At times the star is pretty well seen.
7'4, 8-2 * '72 I | Same telescope. Stars well seen in general and pretty steady.
C tº tºmº 5 I '994 | a Cygni. Daylight. Never quite separated.
6, 7 — 53-699 || When best seen, the elongated disk is decidedly notched.
tºº '87 Circumstances not good enough to do justice to this object. Pr. 467 is
3 too high. -
ſºmeº :876 Sadly unsteady, and moulds greatly.
•88 Night very fine. This high power brings out the elongation, but the
tº e wºssºmsº 2 star is rather too unsteady.
With A. C.'s 7%-in. object-glass. Both st le wellow. At ti 11 p
5%, 6% * 54*734 . ‘īā 㺠i. . ; . *::::: . *:::::: ºná jº.
being a trifle flattened.
268 Rev. W. R. DAWEs, Catalogue of


; . É # | < # # +5 *
• No. Designation. ### ... º Position. É # ; # É # ;
. . às. # B | \, C # B | 6′.
2239 || 4 Aquarii 2729 28 43 28 96 iſ 62.88. 3 16 || 320 //
224o 61.23 || 3 | 12 || 6oo |
224. I 65.88 || 3 || 1 1 || 6oo o'6est. ..
2242 64.75 || 2 || 5 || 420
2243 © 72°75 || 5 | I 2 || 42O
2244. 81-73 || 2 || 3 || 35o
224.5 95'90 || 3 || 3 || 353 o'5 est. . . . I 353
2246 - e & . º 0 e Q IoI-70 || 3 || 4 || 63o o'3 est. . . . 2 63o
2247 Anonyma. 2730 20 43 38|84. Io || 335-61 || 5 || 39 353 || 3’546 || 4 || 26 || 353
2248 || Anonyma. [415]|zo 44 17| 6o 8 || 238-45 || 5 || 22 || 26o || 3:394 || 4 || Io 26o
2249 tº º © tº e & 239. Io || 3 || 22 || 353 || 3:361 || 4 || 19 || 353
225o | Anonyma. [416]|zo 46 39 46 49 || 143’57 || 3 || 22 || 353 || 7'o'47 || 4 || 29 || 353
2251 | Anonyma [418]|zo 48 40|57 52 | 115-93 || 5 || 23 || 435 | o'609 || 2 || 5 || 435
2252 | Anonyma [423]|zo 49 48|48 3 || 78.29 || 3 || 14 || 375 || 2:86o || 4 || 12 || 375
| 2253 's Equulei A&B 2737 |20 51 35|86 17| 286.33 || 5 || 21 | 6oo o'7est. .. 6oo
22.54 © Q 285'73 || 5 || 32 6oo o:7est. tº º
2255 285-82 || 2 || 9 || 6oo
22.56 294°38 6 17 42O tº tº tº G
2257 287°42 || 3 || 17 | 6oo o'598 || 4 8 6oo
2258 287-85 3 6 || 42O o’7 est. . .
2259 287:37 || 4 || 20 35o o'66o || 4 || 1 I 35o
226o 283’ I 5 || 6 || 12 || 35o tº º e & I gº e
2261 287°oo || 3 | 18 435 o'738 || 6 || 18 475
2262 286.77 || 5 || 35 | 375 o'878 || 4 || 8 || 375
2263 287.70 || 5 || 30 || 375 i o'868 || 4 || 12 || 375
2264 285'94 || 5 || 34 353 | I to I 5 || 4 | I 5 353
2265 285.43 || 5 || 38 || 353 || O'920 | 6 || 19 || 353
2266 gº 284'o'; 5 24 467 o'983 || 6 || 2 | | 353
2267 • Equuleièso e 77'o'; 3 | 18 || 6oo | Io:766 || 4 || 25 | 6oo
2268 77'27 | 3 || 1 I 320
2269 76'83 || 5 || 44 || 3oo | Io'742 || 4 || 29 || 3oo
Micrometrical Measurements of Double Stars.
269
§ §
- f # Epoch
: §
2239 o P. W. 39°68o || 4 Aquarii. A notched wedge; very difficult.
224O e -> '688 At best a slightly notched wedge.
2241 6, 7% tº-sº 40-652 | A wedge, when best seen certainly notched.
2242 | 6, 8 tº-mºs '871 | Unfavourable.
2243 tº-sº 4 I '797 || Only slightly elongated.
2244 || 6%, 7 Pr. Cr. 43°759 | Both white. A wedge when best seen.
2.245 6, 6% P. W. 53-699 A slight elongation.
tº-mº e With A. C.’s 73-in.object-glass. There seems to be a slight elongation
2246 e D 54*748 which is confirmed by the agreement of the individual measures.”
2247 || 9, 9-H -> 537 Io | x 2730. The position agrees with Mr. Hind's in 1846.
2248 || 8, 9% -- 47.91o oz 415. A, white, The magnitudes are rather doubtful from haze.
tº A, pale yellow; B, purplish 2 Hazy; the true mags. are probably higher.
2249 || 8, Io -* 53°7 Io Bright moon. § p y nig
225o 8. 1, 9°o -e 53-888 O X 416. Brilliant night, but far from good.
2251 | 73, 7} | Sph. Cr. 48.677 ox 418. Just separated when best seen. Both white.
2252 7, Io P. W. 53.770 ox. 423. A, white, Rather difficult on a might only moderately favour-
5 5 & W T s 3 able. -
2253 7, 8 t-nºs 39'688 Equulei, A & B. Both stars yellowish. Decidedly notched, but never
2 separated,
22.54 5, 53 - 40-652 | Nearly separated.
2255 5, 5% º-ºº: '685 | A deeply notched disk.
2256 5, 5% º 41797 | A slight notch visible in the disk.
2257 || 4%, 5 tº- '847 | Rather favourable. -"
2258 6, 7 º-sº 42.822 | Both pale yellow. Only elongated.
2259 5, 6 | Pr. Cr. 43°756 | Both yellow. At times just separated.
226o 6, 6% * ‘789 || Only just elongated. Air bad.
2261 5, 6 lsº 6] 47.632 | Both pale yellow. Dist. measured with the spherical crystal micrometer.
2262 44, 5} | P. W. |48 664 || Just in contact at best.
2263 5%, 6 à * •675 | Disks just separated, with perforated whole aperture.
2264 5%, 6 tº- 53.754 || Just separated when best seen.
At first well seen and completely separated. Clouds interrupted the obs.
2265 tº- •8 I4. of distance.
2266 º - '98o Well divided, but unsteady.
. A+B
2267 || 6′5, Io -e 39'688 Equulei + & C. Very unsteady.
2268 º * 40-805 || Obs. pretty fair.
2269 4, 9 tº-mº 4I '847 Measures difficult from elongation of the large star.
270 Rev. W. R. DAWEs, Catalogue of
- . . ; #3| R.A. |N.P.D. . . #| #| 5 || 3 | #| | | |
No. Designation. 33% 1856. 1850. Position. ; # # .2 ; & g
&c. - # B | & a || 3 || B | &
l–l O O
2270 Equuleiºso 2737 2. sº 3; 8é 17 76%3 3 | I 5 || 18.5 1 *249 3 | 15 I 85
2271 (continued) 77°37 || 3 || 19 || 375 | I I ‘219 || 4 || 17 | 375
2272 • * 76°24 || 5 || 35 | 353 || 1 o'332 || 4 || 18 || 353
2273 ||P. xx. 429 = 2741 |zo 53 42|4o 7| 32°27 | 5 || 25 320 || 2:036 || 4 || 18 || 320
... ºº 3229 || 5 || 35 | 322
2275 © tº • ... 32°28 || 5 || 37 || 322 e tº
2276 Anonyma 2744|zo 55 27|89 3| 185'85 || 5 || 37 || 435 | 1.429 || 4 || 28 435
2277 Cephei 83 B |2751 |zo 58 |33 56|| 347-42 || 5 || 34 || 322
2278 tº º e e 347-16 || 5 || 38 || 353. I-809 || 4 || 24 || 353
2279 61 Cygni 2758 |z1 o 11 51 59| 96-27 || 5 || 39 § 16. 166 || 2 | Io 27o
228o º 95'8o || 5 || 3o 3oo 16749 || 4 || 24 || 3oo
228 I 97'4o || 5 || 29 || 320 | 16.374 || 4 || 19 || 320
2282 96.98 || 3 | 16 || 320 | 16.426 || 6 || 27 | 320
2283 97.94 || 3 || 23 420 | 16:553 | Io 78 || 420
2284 98.90 || 3 || 26 185 | 16.780 || 3 || 26 185
2285 99.13 || 6 || 23 190
2286 99.97 || 6 || 46 || 420 tº º
2287 Ioo’87 || 3 || 24 || 322 || 17'o';3 || 6 || 42 || 322
2288 IoI'o'7 || 5 || 44 322 || 17 Ioo | 6 || 58 322
2289 Io2 17 | 5 || 33 322 || 16.975 | Io 76 || 322
2290 IoI '77 || 5 || 38 252 || 17'o.40 46 252
229 I Io9'92 || 5 || 34 268 || 17'o.44 19 268
2292 Io9'77 || 3 | 16 || 135
2.293 IoA-28 || 3 || 22 || 375 || 17:23 o || 4 || 20 | 375
2294 tº º © 2 Io4'49 || 3 || 26 || 5oo || 17-261 || 4 || 28 5oo
2295 || Anonyma 2760 |21 o 39 56 28 || 2:23:90 || 3 || 22 || 3oo | 12:152 || 4 || 3 | | 3oo |
2296 222'95 || 4 || || 4 || 35o | II '909 || 4 || 14 || 35o
2.297 223 so | 5 ||34 || 350 || 1973 || 5 || 3 || 350
2.298 © e 223-63 || 5 || 19 || 35o | 12: 169 || 5 || 19 35o
2299| Anonyma | 2767 |21 3 38|7o 39 || 30-60 || 3 | 12 || 320 || 2:686 || 6 || 23 || 32c
23oo 33.83 || 3 || 10 || 375 || 2:686 || 4 || 13 || 375
Micrometrical Measurements of Double Stars.
271
2270
227 I
2272
2273
2274.
2275
2276
2.277
2278
2279
228o
228 I
2282
2.283
2284
2285
2286
2287
2288
2289
2290
229 I
2292
2.293
2294
2295
2296
2.297
2298
2299
23oo
E # Epoch
#, g 18oo + Notes.
CŞ ..S.
> >
5#, 9 Pr. Cr. 43°789 || A & B, light yellow; C, blue. Bad vision. Assumed zero of distance.
44, 5}, 8 || P. W. 48°664 || C is blue. -
5%, 6, 7} | – || 53°754 || C is light blue.
7, 8 *º- 41 ‘803 || P. xx. 429. Both stars very white. Vision very bad.
6, 8 — |46'98o | Both white. Very unsteady and flashy.
6, 8 — 47.909 | Both very white.
6%, 7} | Sph. Cr. 48°682 | x 2744. A, very white; B, brownish.
6 7 P. W. 6.681 Cephei 83 B. Both white. Air bad; good measures of dist, cannot be
2 . W. 40'9 procured.
6'5, 7'o * , 53°882 | Both remarkably white. At times beautifully seen.
tº e mº- 39746 61 Cygni. Measured with a new micrometer by Dollond, intended for
Mr. Lassell.
5, 53 smº "759 || Obs. moderately good.
5, 5} *- 4o'729 Obs. pretty good.
6, 6 # t- ‘745 | Unsteady.
6, 7 - ſº- 41°873 | Both yellow. Obs, very good.
6, 6% | Pr. Cr. |43.759 | Both light yellow. Assumed zero of distance.
tº e |P. W. '950 | Very cloudy; stars badly defined and unsteady.
tº tº- 44'ooo Both light yellow. Pretty well seem.
5}, 6 tº- 46.8oo Both yellow. Well seen at times.
6, 6% gººmsm '914 || At times beautifully seen.
6, 6% * 47'909 | Both yellow. Pretty well seen in general.
6 *- e A, yellow ; B, light orange. Favourable, though there is a heav
5}, 48°647 'thunder storm in the sº horizon. j y
º o * 50-877 Stars unsteady.
tº e tº- 5 I '84 I | Excessively tremulous and furred. High power cannot be used.
tºmsºmº- 52'792 | Unsteady, but at times sharply defined.
º * 53 •6 55 | Well defined in general and pretty steady.
7, gºm- 41-669 | x 2760. Favourable.
7}, 8% Pr. CT. 43°789 Both white. Assumed zero of distance.
7, 8 ſº '8o3 | Both white. At times tolerably seen. Assumed zero of distance.
7}, 8 tº- •866 | White stars. Unfavourable. Assumed zero of distance.
8, 8% | P. W. 41-603 | x 2767. Both stars beautifully white.
e gº- 53.770 | The stars are hazy and very unsteady.
272
Rev. W. R. DAWEs, Catalogue of


& 2 º' ; #3 R.A. |N.P.D. , ... # #| | # i #
No. Designation. § § 18 so. 1850. | Position. # # & à # É &
2301 | Anonyma | 2767 2. § 38 73 3% 3697 5 27 | 353 #695 | 4 || 1 I 268
23O2 (continued) tº º 3 I-61 || 3 || 2 || || 353 || 2:685 || 6 || 3o 353
2303| Anonyma [431]|21 5 51 49 2.1] 1 17:07 || 5 || 35 || 252 || 3' 172 || 4 || 22 || 252
23O4. © [º tº º o I 1797 || 5 || 25 || 435 | 3'306 || 4 || 18 || 435
2305 1 17:38 || 5 || 35 | 375 || 3:247 || 4 || 16 || 375
2306 e O e I 18.72 || 4 || 12 145 || 3'434 || 4 || 24 | 1.45
2307 • Q e e I 17'92 || 5 || 34 203 || 3' 190 || 6 || 33 | 203
2308| Anon. A & B 2776|21 7 18|Ioo 58, 51.73 || 3 || 14 | 185 |85-o88 || 4 || 16 | 185
| 2309 B & C .. © e º 337'90 || 3 | Io 185 | 5'951 || 2 || 4 | 185
2310 | P. XXI, 5o [432]|21 8 34 49 28, 129-25 || 5 || 29 || 467 || 1'o63 || 6 || 32 || 467
23 l I © tº e Q © & 130°26 || 5 || 22 || 353 || 1:096 || 6 || 28 || 353
2312| Equulei 27 B 2786 21 12 19| 81 6 184'oZ || 5 | 18 6oo || 2:405 || 4 || 1 || || 6oo
23 I 3 ... I tº gº 184: 16 || 3 || 14 || 357 || 2:25 I | 6 || 2 || || 357
2314| Anonyma [435]|21 13 5ol 87 44, 204-17 | 5 || 15 - 375 o°6est. ... || 2 || 375
23 I 5 © º º © 199:60 | 5 || 14 || 353 |o'55est. ... | 3 || 353
23 16 o tº Q 202°37 || 3 || 6 || 630 |o'55est. . . . 2 | 63o
23 17 tº dº Q & zoo’90 3 || Io 48o o' 5 est. 2 48o
2318| Anonyma. [437]21 1 4 3o 58 Iol 63-65 || 5 || 35 | 435 | 1.288 || 4 || 19 || 435
23 19 e O 60-84 || 3 || 14 || 5oo | 1.372 || 4 || 18 || 5oo
232O 61°og | 5 || 3o 375 || 1:269 || 4 || 13 || 375
232 I e e 59°o7 || 5 || 32 5oo | I-227 || 4 || 16 || 5oo
2322 | Pegasi 20 B | 2799 |2 I 2 I 35| 79 34 32923 || 7 || 57 {:} 1.197 || 6 || 3o 6oo
2323 327 I 5 || 5 || 3 I 420 | 1.364 || 4 || 2 I 420
2324 e 328-63 || 3 || 22 || 6oo | 1.372 || 4 || 18 6oo
, 2325 3.24°o 5 || 7 || 23 || 32O
2326 327°42 || 5 || 20 | 32O tº C.
2327 327-22 || 5 || 26 || 420 || 1:197 || 4 || 8 || 420
2328 326'77 || 3 | 12 || 420 || 1:26o || 2 || 5 || 420
2329 * 327 I 5 || 3 || 20 42O | I 182 || 4 | I 5 42O
233O 327°45 || 5 || 24 || 320 | I 252 || 6 || 20 | 320
233 I 327.67 || 2 | 12 || 35o || 1:241 || 2 | 12 || 35o
Micrometrical Measurements of Double Stars.
273

# # Epoch
No. § É I8oo +
>. >
23OI tº º P. W. 53.827
23oz 7-8, 8.2 — •88O
2303 || 7#, 8 — 48:647
23o4| 7#, 8 || Sph. Cr. 682
2305 || 8:1, 8.3 | P. W. 53°770
2306 e G Pr. Cr. '890
2307| 8-6, 8.8 || Sph. Cr. 54.843
2308|| 7, 9 P. W. 41'644
2309|| 9, Io -º 41-644
23 Io - e tº-ºmº 53-847
2311 || 7.5, 8:o || – ’879
2312|| 7%, 8% — 4o 570
23 I 3 | ... • — 54'776
2314|| 73, 73--| – |48-675
2315|| 7-9, 8' I — 53°814
23.16|| 7-5, 7-6 || – || 54,734
23 17 e G t-mº ‘748
2318| 63, 7 || Sph. Cr. 48.677
23 19 7, 7+| P. W. 52.732
232 o|| 6'9, 7' I — 53°77O
232 I - © -*. 54.672
2322 || 7, 7+| – 39°773
2323 6, 6% -- 40-641
2324 6, 6--| – 4o'653
2325 © tº tº-mº ‘706
2326 tº e * '734.
2327 | 7, 7+| — '832
2328| 7, 7–H tº-mº 41-666
2329 || 7, 7+| – •669
233 o| 7, 7} | – ‘713
233 I | 7, 7+| Pr. Cr. 43°756
ROYAL ASTRON. SOC. Wol. XXXV.
Notes.
Excessively unsteady and diffused.
Both white. Diffused and unsteady.
O X 431. Both stars white.
the S.E. horizon.
Both reddish. Extremely unsteady.
Both white. Disks diffused.
With Mr. Bishop’s D. I. Crystal Micr. by Dollond. Stars rather hazy
and faint.
With Alvan Clark's 73-in. object-glass. Hazy sky and bright moon,
rendering the double-image rather faint.
x 2776, A & B. Difficult in distance from diffusion of the disks.
> 2776, B & C. Difficult.
Favourable, though a thunder-storm is in
O X 432. Hazy.
Both white.
Equulei 2.7 B. Stars excessively diffused.
With Alvan Clark's 73-in. object-glass. Stars extremely unsteady.
O 2 435. Both white. A decided elongation, but the air is not good
enough at this altitude. -
Decidedly elongated. Rather hazy; the mags. are probably small.
With Alvan Clark's 73-in. object-glass. Air unfavourable,
Same telescope. The star requires more power than the air will bear.
O x 437. Both white. Not very favourable.
White stars, very nearly equal.
Moderately good circumstances.
With Alvam Clark’s 73-in. object-glass.
Sadly unsteady and often
greatly diffused. -
Pegasi 20 B. Favourable.
Obs. moderately good.
Seldom separated with sufficient distinctness.
Stars separated by glimpses only.
Difficult.
Difficult.
Both white.
Favourable.
Pos. good; Dist. tolerable. -
Both white. Unsteady. Soon completely clouded.
N N.
274. Rev. W. R. DAWEs, Catalogue of


No. Designation. # ź i. * | Position. i § ; # # § :
ão # B: P- ſº # 3. P-
t—! O O
h II) S O J O W/
2332 Pegasi 20 B 2799 |21 21 35| 79 34 || 325°o7 || 3 | 18 || 322 | I to 31 || 4 || 12 || 322
eas, (continued) 323°o8 || 3 | 16 || 353 || I-61 o || 4 || 14 || 353
2334| 32 o'5o || 3 || 24 || 353 | I 187 || 4 || 28 || 353
2335 32 I'74 || 6 || 20 | 275 || 1:400 || 6 || 47 | 275
2336 32046 || 5 || 30 sool og/5 | 6 || 32 soo
2337. 32 of Io || 5 || 25 || 48o | I 25o || 6 || 35 || 48o
2.338 te 32 o'o6 || 5 || 32 || 48o I-262 || 6 || 45 || 48o
2339 32 I’og | 5 || 36 || 48o || 1 185 || 6 || 33 || 48o
234o tº º o tº ſº & © 3 1970 || 5 || 34 || 48o | I 172 | 6 || 42 || 48o
2341 Pegasi 29 B | 2804 |21 26 3| 69 57 || 317-77 || 3 || 24 6oo || 2:939 || 6 || 38 6oo
2342 3 1873 || 3 || 19 || 32O || 3:206 || 4 || 20 | 320
2.343 317.60 || 5 || 29 || 420 2.632 || 6 || 23 420
2344 317' 57 || 5 || 28 3oo e -
2.345 319-67 || 4 || 1 I 185 || 2:9 F6 || 4 || 12 185
2346 319 of | 5 || 39 375 || 2:745 || 6 || 4o 375
2347 32 I'34 || 5 || 37 || 353 || 2:879 || 4 || 25 | 353
2.348 32O'89 || 3 || 2 I | 353 || 2934 || 4 || 2 I | 353
2349 320-60 || 3 || 15 || 353 || 2:989 || 2 || 6 || 353
235o e - - e 322:24 || 5 || 35 | 48o || 2:813 || 6 || 44 || 48o
235 I pu Cygni 2822 |21 37 26 61 56 || 1 14-28 || 3 || 12 || 320 || 5'454 || 6 || 23 320
2352 ... I 14:37 || 3 || 17 | 420 | 5.349 || 4 | 20 i 420
2.353 I 25' 12 || 2 | Io 32O tº e e &
2354. I 1297 || 5 | 18 185 || 6′o27 || 4 || 12 | 185
2355 II 5’25 || 4 || 3 | | I 85 || 5'3 I 5 || 4 || 32 185
2.356 tº º gº º tº tº I 14.62 || 4 || 22 || 35o || 5°268 || 4 || 19 || 35o
2.357 | P. xxi. 328 [451]|2 I 46 3o 29 5 || 222-83 || 3 || 23 353 || 4'543 || 4 || 23 353
23.58| Anonyma [454]|21 49 15|66 21 || 277-90 || 5 || 24 || 375 || 6'987 || 4 || 19 || 375
| 2359. Anonyma [456]|21 5o 6 38 9 || 28-89 || 5 || 29 || 353 || 1: 145 || 4 || 12 || 353
2360 | Anonyma. 2848 |21 5o 31|| 84.46 55'90 || 3 || 17 | 420 || 1 o'622 || 4 || 2 I 420
2361 55.78 || 3 | Io 42O || Io'735 | 2 || 9 || 32O
2362 | 56-53 || 5 || 25 3oo | Io'57o || 4 || 12 || 3oo
Micrometrical Measurements of Double Stars.
275
*

E # Epoch
No. #. 2 18oo + Notes.
º .3
> >
| 2332 || 7%, 7% +| P. W. |47°832 | Both very white.
2333 || 6%, 7 -Emmºn 537 Io | Both very white. Greatly diffused.
2334|| 7' 5, 7:6 *ºs '890 | Very white. Sharply defined, but unsteady.
º Another set th ight, taken with Mr. Bishop's Pris. Cr. D. I. Micr. Pos. b
2335 © e Pr. Cr. 890 ‘.... º: #. †: jº. º of . º: ãº. OS. Dy
e tº o With Alvan Clark's 73-in. object-glass. Unfavourable. The southern
2336 P. W. 54.672 star judged to be rather the smaller.
2337 *ºn '734 Same telescope. Very unsteady and diffused. Southern star thought
rather the smaller.
2.338 e * '74o | Same telescope. Very well seen and pretty steady.
© Same telescope. Air unfavourable. Southern star thought rather the
2339 º -ºº: 743 smaller. -
234.O *ºn '747 | Same telescope. At times well seen.
234. I | 7, 7 ſº-ºmmº 39'68o | Pegasi 29 B. Often much diffused.
2342 & © tº-mº ‘739 || Pos. very good; Dist. very poor.
2 -º S. moderately good.
2343 8, 9 4 I '797 Ob derately good
2344| 6, 6-1- * 43'718 Both very white.
2345 & G Pr. CT. ‘718 || The air is excessively disturbed.
2346|| 7, 7} | P. W. 48-647 Both very white. Favourable, though a thunder-storm is in the S.E.
horizon.
2347 | 8, 8% tº-mº 53°7 IO | Rather diffused and not very steady.
234.8 || 7-8, 8°2 cºmme •- Both white. Very unsteady, glimmering and confused, with occasional
34.8 || 7-8, 754. good views. y y
234.9 e * ‘888 || The star is too unsteady for reliable measures of distance.
I * e With Alvan Clark's 73-in, object-glass. Well seen at times, and pretty
235o 7#, 8 54."744 steady. Both light yellow. y
235 I 4, 5 -sº 4 o'707 | (, Cygni. Unfavourable.
2352 |4}, 6 -º- '822 Obs, pretty good.
2353| 4, .. 5 -mº 41 '644 || Both white.
2354|| 4, 5% -me ‘709 Obs. tolerable.
2355 4, 6 Pr. Cr. 437.59 Both light straw-colour. Night fine.
2356| 4, 6 -º- .8o3 || A, white; B, purplish. Hazy and unfavourable. Assumed zero of dist.
2357 || 7-8, 8.6 P. W. 53.981 o 2.451. A pale yellow ; B, purplish 3 Occasionally well seen.
23.58| 7%, Io – 48.647 || 0 × 454. A, reddish ; B, blue 2 Favourable.
2359 || 7-9, 8-9 -sº 53.98o 92 456. A meat star, at times well seen.
2360 | 8, 8% - 4o:871 | x 2848. Very unsteady and furred.
2361 | 8, 8% -mº 41-630 || Both white.
2362 | 7, 7% -ºmº '633 || Both very white.
276
Rev. W. R. DAWEs, Catalogue of

- R.A. | N.P.D. § | 3 || 3 § | #| #| | #
No. Designation. 3 # Ž 1850. 1850. Position. É .# g § £ | # ;
32. #| B | 5 || 3 | #| B | *
S. O O
h m sl o ſ O ',
2363 || Anonyma 2868 |22 2 zo. 68 I I o:70 || 3 || 6 || 3oo • . tº € e e
2364 |Pegasi 148 B|2878|22 7 o' 82 47| 133'55 || 5 | 18 357 | 1.323 6 | 18 357
2365 { * 290o 22 16 27| 69 55 || 179'17 | 5 || 23 || 3oo || 2:844 || 4 || 25 || 3oo
2366 tº e - © 179'oz | 3 || 15 420 || 2:768 || 2 || 6 || 420
2367 179° 18 || 3 || 14 || 26o . . . . . . . .
2368 tº ſº º 180-81 || 5 || 2 || || 357 || 2:404 || 6 || 26 || 357
2369|| 3%'. *} 29Oo 34o'67 || 3 || 24 || 3oo |57'774 || 2 | 16 || 3oo
2370 tº gº tº º 340-90 || 3 | 16 || 420 |58-190 || 2 || 6 || 420
2371 & Aquarii 2909 |22 21 6| 9o 47 || 35o'25 || 5 || 3 I | 32O || 3'873 || 4 || 29 || 32O
2372 349'92 || 5 || 39 || 6oo || 3:454 || 4 || 36 6oo
2373 o 35o 50 || 3 | I 5 || 320 3'881 || 4 || 28 || 32O
2374. 35o'25 || 3 || 2 I | 3oo e
2.375 349'92 || 3 | I 2 | 3oo tº gº e
2376 tº 349.90 || 5 || 42 | 6oo || 3:917 | 6 || 48 || 6oo
2377 35o'33 || 5 || 3 || || 420 || 3:574 || 4 || 16 || 420
2378 34.9°73 || 3 || Io 6oo
2379 35o'45 | 2 | I 5 360 we º º
238o * > 34978 || 3 || 25 || 360 || 3:646 || 6 || 48 || 360
2381 348-90 || 3 | I 5 || 320 || 3:298 || 2 || 6 || 320
2.382 348'50 || 5 || 20 | 3oo
2383 348-42 || 5 || 22 || 42O tº º
2384 348-23 || 6 || 36 | 190 || 3:497 || 6 || 33 190
23.85 348°oo | 6 || 43 || 420 || 3’538 || 6 || 4o 420
2386 3'479 || 4 || II | 35o
2387 349:32 || 4 || 13 | 185 || 3:394 || 4 || 12 | 185
2388 º 348-97 || 4 || 2 I 185 || 3:417 || 4 || 20 | 185
2389 & 348-55 || 6 || 24 185 || 3’538 || 6 || 24 185
2390 348- 13 || 6 || 25 | 185 || 3’518 || 6 || 26 185
2391 348-23 || 6 || 25 185 || 3’505 || 6 || 25 185
2392 348-33 || 2 || 4 || 185 || 3°485 || 2 || 4 || 185
2393 tº º 348-35 | 6 | 18 185 || 3:612 || 6 | 18 185
Micrometrical Measurements of Double Stars.
277
E à Epoch
No. # É 18oo + Notes.
> >
2363 e e P. W. 44°ooo | x 2868. White stars, scarcely ever separated. (Dist. 1"--).
2364 © ºmmºn 54.775 | Pegasi 148 B. With Alvan Clark's 73-in. object-glass. Bad night.
2. 365 tº º immº- 39°7'Io 33 Pegasi A & B. Pos. pretty good; Dist, tolerable.
2366 || 7, Io * 4o'822 || Vision extremely bad.
2367 6, 8% tº mºn- 46'767 || Moderately good circumstances.
2368 || 6′5, 9°o tº- 54'776 Wºº, º,#. ;" Extremely unsteady and dif-
2369 º &= - 39716 || 33 Pegasi A & C. Obs. good.
2370 || 7, 8 gamº 40-822 | Pos. pretty good; Dist. very poor.
237 I 5, 5 * 39'672 & Aquarii. Ill defined and unsteady.
2372 - 5, 5 Wºmº '68o | Favourable circumstances. Pos. excellent; Dist, nearly perfect.
2373 e ºm- '740 | Extremely unsteady. -
2374. o * '746 || Unfavourable.
2375 e G ſº ‘759 | Excessively ill defined and tremulous.
2376 4}, 4% º *773 || Both stars of a pale straw-colour.
2377 © º ºsmº ‘798 || Hazy and unfavourable.
2378 e e sº '890 Air very bad.
2379 || -- tºº ‘923
238o 5, 5 tºmº '925 | Favourable.
2381 || 4%, 4% | – || 41-631
2382 4%, 4% º- '693 | Unfavourable.
2383 || 43, 4% *mºnº ‘884 Bº. i. ::::::::::::..." defined and excessively unsteady. Tele-
2384 • * tºmmº- 42 "O44 Sunshine.
2385 |43, 4} + tºmº '669 | Both white,
2386|s, 54. Pr. Cr. 748 |*.*.*.*.*.*...****
2387 |4}, 4} + ºmmºn '909 | Both white. Became cloudy.
2388 || 43, 4} ºmmº ‘947 | Very unsteady and flickering. Cloudy.
2389 || 4, 4-H. tºmimºs 43-622 | Both white; unsteady and glimmering.
| 2390 4, 4-H | – .625 | Badly defined and unsteady.
2391 || 43, 4} * = . '724 || Occasional good but transient views.
2392 || 43, 4} tº- ‘737 Vº ... * ; these stars cannot be safely measured,
2393 || 4 #, 4á tºmºmº '778 || Night brilliant, but extremely bad.
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gº tº º º o92 || $ 1 || 3 || $9.9% 46% z
g oo? | ## | 9 || 85.4% 96%z
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Hö : 3. t Hö 3. 3. : So,
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# | # | # | # | * | # | # ord'N | vºl |* : :
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Ø Ø l–1
Micrometrical Measurements of Double Stars.
279
# # Epoch
No. É. g 18oo + Notes.
cy .3
> >
2394 4}, 4% Pr. Cr. 43'817 | Bad vision. Assumed zero of distance.
2395 || 4%, 4} | P. W. 44'Ooo | Both white. Twilight. Stars unsteady, and mostly ill defined.
2396 43, 4} * ‘Oo3 Twilight. Stars furred and very unsteady.
2397 || 4, 4-H | – 46.767 | Both white. Ill defined, and very unsteady.
2398 || 4, 4-H. tº- '95o At times admirably defined, though usually very unsteady.
2399| 4, 4% ammº- '96 I | Pretty steady. Twilight. -
24OO gº-ºº- 47'o'3o Daylight. Stars perfectly well seen at 3' 30" m.t.
24O1 || 4%, 4} | Sph. Cr. '934 || Air bad.
- 24O2 e P. W. 48-O47 | Sunshine. The air is hazy, and the star unsteady and poorly defined.
24O3 4, 4% tº- 5 I'994 | Unfavourable during obs. of distance.
24O4] 4, 4% * 52.778 || Vision variable, but at times good.
2405 || 4, 44 sº- 53-655 || Occasionally very well seen, and pretty steady.
24O6 º *mº- '699 || Vision excellent at first, but deteriorated.
2407| 4, 4% gmº ’713 || At times well seen but unsteady.
2408 smº ‘72 I | Unsteady. Thick fog formed.
24O9 e smºº ’879 || The stars start and glimmer; great patience required and bestowed.
24. Io © Sph. Cr. '945 || Favourable.
24 II º IP. W. '986 Daylight; hazy; stars very unsteady.
24. I2 4}, 4} +| Sph. Cr. 54-843 Wºº, * 73-in. object-glass. Both stars very white; furred
24 I 3 P. W. '988 Same telescope. Twilight. Stars very unsteady.
2414| 6, 7 tºm- 39.688 || 37 Pegasi. Vacancy between the disks = at best # diam, of smallest.
2415 || 6, 8 smº- 41:797 | Seldom seen double; a second measure cannot be obtained.
2416| 7, 8 -> '961 | Not well seen. No more obs, can be got.
2417 | 7, 8 Pr. Cr. 43.789 | Both white. Extremely confused; seldom seen double.
2418 6, 7 *- '928 || Both white. Seldom distinctly separated and very unsteady.
24. I 9 P. W. 53-882 At first pretty well seen, but became worse during obs. of distance.
242O 6-3, 8°o tº-º 54'734 with *.$ºn A, pale yellow; B, purplish. Well
242 I smº ‘744 | Same telescope. Occasional good views.
2422 º- ‘748 || Same telescope. At times beautifully defined, and pretty steady.
2423 8, 8 º 4 I '8o3 | x 2917. Both white.
2424|| 9, 9} | Pr. Cr. 43.814 | Very bad night. Assumed zero of dist.
28o Rev. W. R. DAWEs, Catalogue qf


„ ? Â 3 I §
Éâ sl RA. IN P D. i| i | g | i | i| i | ;
No. | Designation. ää^ 185o. | 18 go. | Positiom. $ § É â É - É É
^ s. 5 δ |
242 5 || 8 Lacertæ | 2922 2? 25 12 51* § 18§62 5 | • 3oo q. •
2426 | Anonyma | 2925 [22 3o I 9| 84 52 3:87 | 5 25 3oo - ® -
2427 | Anonyma [476] [22 36 35| 43 39 || 333*6o | 3 | 15 | 353 I o 65 est.| .. | 3 | 353
2428 e > 328: I 2 | 3 | 8 | 3o8 I o 6o3 | 4 | 8 || 3o8
2429 | Anonyma, [478] [22 37 19] 5 I 19 | 28o-45 | 5 | 25 , 3oo | 3'o17 || 6 || 4o | 3oo
243o - I 28o*73 | 5 | 39 || 353 | 2*8o9 | 4 | 32 | 353
243 I ( … - • © • 279-3o | 5 || 32 | 353 | 2964 | 4 | 29 || 353
2432 | 52 Pegasi [483] [22 5 I 42] 79 4 «• o*9o5 || 4 ] I 2 || 475
2433 «• «• I9o*9o | 3 | I 2 || 353 | I '23o | 4 | 12 | 353
2434] Anonyma | 2968 [22 53 33| 59 43 || 9o. 53 | 5 || 38 | 3oo | 3'566 || 4 | 16 | 3oo
243 5 | Anonyma [494]|23 I 3 18| 68 52 I 82*o7 | 3 | 24 | 26o I 3* I 56 || 4 | 27 | 26o
2436 82:o2 | 5 || 36 | 375 | 3*3o3 | 6 | 3o || 375
2437 es • 82:33 | 3 | 23 ] 353 I 3*354 | 4 | 28 || 353
2438 | Anonyma || 3oo6 [23 I 3 58] 55 23 || 176*8o | 5 | 26 || 185 I 4*935 j 6 || 13 | 185
2439 I 77*2o | 3 || 9 | 185
244o 177* I 5 | 3 | 7 | 185 ω «• i •
244. I 176:98 | 6 || 18 | 185 || 5* 223 18 | 185
2442 • • � I 75* I 1 | 3 | 19 | 357 I 4*867 || 4 | 17 || 357
2443 | Cephei 287 B || 3o I 7 [23 2 I 46] I 6 42 | 34*7o | 3 | I 1 | 32o || 2*29o || 4 | 1 3 | 32o
2444 | P. XXIII. I oo [496] [23 22 58] 32 17 | 222:37 | 7 | 22 || 32o
2445 = D 2 222* 52 | I o | 5o | 32o | I '433 ] Io || 37 | 32o
2446 22 1 87 | 5 || 34 | 32o | I '489 || 6 | 32 | 32o
2447 225*97 | 3 | 16 | 26o �
2448 • ■ • • 224:45 | 5 | 28 {;:} I : 627 || 4 | I 5 | 3oo
2449 | Anonyma, [5o3] [23 34 27] 7o 3 I I I3I ' I 2 | 5 || 33 || 322 | I '223 | 4 | 8 || 322
245o © © I 28:66 | 5 || 31 | 353 | I '8o3 | 6 || 26 | 353
245 I ę I 3o* 52 | 5 | 22 || 48o | I '69 I | 6 || 28 | 48o
2452 o I 3o' 57 | 5 || 33 | 48o I I* 598 | 6 | 33 | 48o
2453 • • I 29' 58 | 5 || 34 | 296 ] I *6 I 2 || 4 | 2 I | 296
2454 || 6 Cassiopeæ [5o8] [23 41 34| 28 37 | I 94*68 | 3 | 14 | 375 | I '637 || 4 | I o || 375
2455 | Anonyma [5o9] [23 42 59| 47 26 I Io4*98 | 3 | I 4 | 268 | 5* 5o3 | 4 | I 2 | 268
Micrometrical Measurements of Double Stars.
281
.# §
No. # à | .
§ .3
> >
2425 | 6, 6} | P.W. 39:759
2426 | – || 39773
2427 7.1, 7-5 — 53-882
2428 || 7-4, 7-9 || Sph. Cr. '915
2429 || 63, 9 || P.W. 47'914
2430 6, 9 gº- 51-898
2431 | 6′5, 90 – 53.789
2432 63, 8 || Sph. Cr. 47.857
2433 P.W. 53-882
2434 7%, I I — 39784
2435 | 8, 8% — 47°895
2436 | 8°o, 8.5 tº- 48.898
2437 8, 8% — 53°713
2438 || 8%, 9 || – || 4o'754
2439 || 9, IC *- 41-688
244o 9, Io tºmº 42.822
2441 9, 1o Pr. Cr. 43.778
2442 P.W. 54,822
2443 | 73, 9 _ |40-693
2444 || 8, Io _ 41°787
2445 8, 1 I 41-808
2446 8, Io * '846
2447 | 73, 9 — 479 Io
2448 || 7%, 9 *- ‘9 I 5
2449 || 8, 8% | – || 47-896
245 o || 7-8, 8.2 *- 53-88o
245 I | 7-7, 8.2 || – || 54-735
24.52 *- ‘744.
2453 8°o, 8'5 º- •822
2454 6, 8% | – || 48.875
2455 | 8°o, Io. 5 | – || 53'994
Notes.
8 Lacertae. Both very white.
Hazy. (Dist. 7"+.)
(Dist. 22#"+.)
2 2925.
O 2 476. Well seen at times, but the elongation is only slightly notched.
The object requires a higher power and better might.
O X 478. A, yellow ; B, blue.
A, orange; B, purple 2 An elegant object usually well seen.
A, orange; B, pale green. Splendidly brilliant moonlight.
favourable. -
O X 483.
Rather
A, white; B, purplish 2 Clouded.
Bad vision : measures of dist. scarcely practicable.
2 2968. Pretty well seen, but not easy.
O > 494. Both white.
White stars.
Both white.
Very neatly defined.
Very unsteady and much diffused.
|Rather hazy.
2 3006. Difficult, especially in distance.
Very difficult.
The sky is hazy and the star very faint.
Diffused, faint, and difficult.
With A. C.’s 73-in. object-glass. Stars greatly diffused during measures
of distance.
Cephei 287 B. Difficult.
P. xx111. Ioo. This close companion was discovered by me while exam-
ining the group for Capt. Smyth. A third star at 25" + n.p.
Usually well seen. Pos. of A. C. = 34.1°83.
Rather favourable.
Usually very unsteady.
Difficult from diffusion of the disks, though the night is apparently
splendid.
O x 503. Both very white. Air bad.
A, pale yellow ; B, rather browner yellow. At times well seen.
With Alvan Clark’s 73-in. object-glass. Both white; much diffused and
unsteady.
Same telescope. Not very favourable.
Both white. Very unsteady, but well seen at times.
6 Cassiop. A., yellow ; B, deep blue green ; a beautiful object. Air
unfavourable. -
O > 509. Night brilliant, but the stars are diffused, and the smaller is
faint.
Same telescope.
ROYAL ASTRON.
SOC. WOL. XXXV.
O O
282 Rev. W. R. DAWEs, Catalogue of

: g # # * # # # t;
No. Designation. ### º: sºº s Position. É .# ; # É .# #
ão, # B: ſº a g B | \,
h in S O / O *== // *E=
2456 | P: XXIII. 24o 3o48 |23 5o 26 66 29 || 313'25 || 5 || 28 320 || 9,135 | 4 || 12 185
2457 || Anonyma [513]|23 5o 42 55 49| 21'55 || 3 || 23 353 || 3:604 || 4 || 23 || 353
2458 o Cassiopea 3o49 |23 5 I 26 35 5 || 324.70 || 5 || 3o 420 || 3-1 13 || 6 || 3o 420
| 2459 . . . . ... I 324'45 || 3 || 27 | 375 || 3’o 17 || 4 || 33 375
2460 | Androm. 37B | 3050 |23 51 52|57 6|| 192'98 || 2 || 4 || 35o || 3:651 | 2 || 4 || 35o
2.6, H. N. 58 • * 195'96 || 3 || 23 357 || 3:472 || 4 || 27 | 357
| 2462 | Anonyma 3061 |23 58 3|73 oil 146.65 || 3 | 18 || 3oo tº e
2463 145'98 || 5 || 25 || 420 || 7'563 || 4 || 14 || 3oo
2464 I45'98 || 5 31 3oo || 7' 575 || 4 || 12 3oo
2465 I45'93 || 3 || 22 185 || 7.588 Io 7o 185
2466 I 45°55 || 3 || 12 || 32O || 7-43 I | 4 | I 5 32O
2467 I45'55 || 3 | 12 || 320 || 7-8 I 4 || 4 | I 2 || 320
2468 I 45'95 || 5 || 3 | | 185 || 7-690 || 6 || 35 | 185
2469 146-22 || 6 || 19 185 > tº tº
2470 144°35 | 3 || 6 || 35o || 7-720 || 3 || 6 || 35o
247 I 146-12 || 6 | 18 185 || 7:736 || 5 || 23 | 18.5
2.472 146.37 || 5 || 34 || 375 || 7-786 || 4 || 16 || 375
2473 147'09 || 5 || 22 || 353 || 7 543 || 4 || 23 353
2.474. © tº º 146'89 || 3 || 15 || 375 || 7-413 || 4 || 17 | 375
2475 Anonyma 3062 |23 58 26 32 24 || 185'90 || 4 || 13 || 320
2476 e Լ 186 o' | 3 9 32O || O'8est. . .
2477 188°53 || 6 || 14 || 420 o'86st. . . . . .
2478 1942.5 3 zo 420 | O'954 || 6 | 18 420
2479 192'82 || 5 || 27 | 420 || O'954 || 4 || 8 || 420
2480 2 I o'oo || 4 || 9 || 35o O'937 || 4 || 9 || 35o
248 I 228.85 || 3 || 23 375 || 1:159 || 4 || 25 | 375
2482 235'24 I | 4 || 375
2483 243-84 || 5 || 32 || 353 || 1:254 || 4 || | | | 353
2484 244°49 || 3 | I O | 353 | . . . .
2485 244.90 || 5 || 2 | | 357 | I 306 || 4 || 16 || 357
Micrometrical Measurements of Double Stars.
283
3 # Epoch
No. § É 18oo + Notes.
> >
2456 || 8, Io P. W. 4 I-846 | P. xxIII. 240. Difficult from smoky air.
2457 7°o, 9°o -º 53°789 oz 513. A, yellow ; B, blue. Elegant; well seen.
2458 || 5, 8 *ms 4I'86o a Cassiop. A, yellow; B, blue.
2459 || 5, 7 - 48.874 || A, pale yellow; B, light blue. A lovely object, at times admirably shown.
2460 | 5, 5% Pr. Cr. 43.814 4. %1. * stars white. Air extraordinarily bad. Assumed
2461 || 7'o, 7-1 || P. W. 5 4-808 With A. C.’s 73-in. object-glass. Both straw-coloured. Night unfa-
vourable.
2462 tº e -- 39'790 | x 3061. Foggy; stars diffused and faint.
2463 t-sº ‘798 || Foggy.
2464 || 8, 8% -- ‘890 | Very tremulous.
2465 || 7%, 7% + tº-me '98o | Favourable.
2466 || 8, 8 --> 4O'754 || Unfavourable.
2467 | 8%, 8% - ‘844 | Pos. very good; Dist. poor.
2468 || 7#, 8 tº-mº 41-644 || Rather favourable. Both stars white.
2469 e Pr. Cr. 42.950 | The air is very smoky and the stars scarcely visible.
247.o — 43°852 | Disks greatly diffused. Assumed zero of distance.
247 I | 8, 8 *- ‘909 Both white. Vision bad. Assumed zero of distance.
2472 | 8, 83 || P. W. 48.899 | Both white. Extremely unsteady and much diffused.
2473 -- 5 I '898 || Tolerably well seen.
2474 - 53°770 | Diffused and faint.
2475 | 7, 7% -º 40.693 | x 3062. Just separated by transient glimpses.
2476 | 6%, 7% wº- ‘764 | Seldom separated.
2477 || 7, 8 - '871 || Scarcely ever separated.
2478 tº-mas 4I '85 I Very unsteady and not often distinctly divided. The air is hazy and
smoky.
2479 73, 8 - '860 | Vision is very bad; the stars are rarely separated.
2480 || 7, 8 Pr. Cr. |43°803 | Both stars are white; they are seldom separated, the air being very bad.
248 I 7, 8 P. W. 48.874 || A, light yellow ; B, greenish.
2482 - 5O'932 | Suddenly clouded.
248 3 || 7°o, 7' 5 - 53'98 I | Both very white. Well separated at times.
2484 e *s 54'o8o | Clouded. The star was badly seen.
2485 -º-º: 54:55 1 || With A. C.’s 73-in, object-glass. The air is in a very bad state.
284. Rev. W. R. DAWEs, Catalogue of
OMITTED :
;: R.A # # tº § É # *
.A. | N.P.D. QD gº! Q
No. Designation. # 185o. 1850. Position. É ; # § É ; #
on C .# Q 3
l- O O
h m S O M O // * I
IoA9 a Anonyma | Io97 || 7 3 29 62 32 || 325'57 || 4 || 17 | 35o I’272 || 4 || 17 | 35o
Io.49 b 326-28 || 4 || 17 | 35o 1' 166 || 4 || 17 | 35o
I O49 c 327°os | 6 || 20 | 35o | I 187 || 4 || 14 || 35o
I o49 d 327-48 || 5 || 35 | 35o || 1:244 || 5 || 36 || 35o

Micrometrical Measurements of Double Stars. 285
§ §
# § Epoch
No. § § 18oo + Notes.
> s:
Ioag a | 73, 8 | Pr. Cr. 43' 146 | Both yellow. Occasionally well seen. Obs, tolerably good.
Ioag b | 7%, 8 * -º 167 | Both rather yellow. Unfavourable; obs. obtained with much difficulty.
I OA.O. C. tºº, . 17o | Both yellow. Good transient glimpses; but usually very confused.
49 7%, 8 7 Pos. middling; Dist. pretty good. y
I o49 d 7, 7% tº-º-º-º: * I 79 | Both very white. Occasionally well seen. Calc. angular correction,
and zero of dist. Obs. good.
(N.B. The mean of these four sets is entered in the Catalogue
wnder the current No. 1050.)
286 Rev. W. R. DAWEs, Catalogue of
Synopsis of the Mean Results of the Observations in the Catalogue.
Designation. f #3 #. * Position. . # # Distance. # # # É # # § ;
%5 g|= |*| |g|*|*|3| 3 || 3 |gº
h m 8 O / O J/
Cephei 316 B 2 |o I 9 || 1 || 7 || 336' 15 || 3 || 14 || 1 || 'o'7 |est. 2 || 1 || 320 P. W. 39.67
Anonyma 19 |o 8 56 54 I4 || I3 I'94 | I 5 55 || 3 || 2'547 I4 || 41 || 3 || 482 || 7°o, 9'5 || – || 54'81
e tº I 3 I "3o || 5 || 23 I 2'503 || 4 || 1 || | I 203 Sph. Cr. '84.
Anonyma 23 |o 9 48 9o 31 || 359'39 || 9 || 3o 2 * * * * > 202 || 7%, Io P. W. 41' 17
12-602 || 6 | 18 || 1 || 320 - 40°84
357'77 || 3 || 14 || 1 || 11'904 || 3 | 16 || 1 |350 Pr. Cr. 43.93
356'92 || 3 || 14 || 1 || Io'977 || 4 || 9 || 1 || 136 © tº P. W. 54°oo
Anonyma 25 o Io 58 |74 5o | 192°23 II || 41 || 3 || 1'535 | 12 || 32 | 3 || 326|| 8-6, 8°7 -º-º- 52°45
A Cassiopeae [12] |o 23 31 || 36 18| II 5'82 || 3 || 7 || 1 || o'539 || 2 || 4 || 1 |308||5'5, 5'6 Sph. Cr. 53'92
tº - 116°ol || 5 || 13 | 1 || o' 569 || 4 || 8 || 1 || 480 || 6’o, 6' 1 | P. W. 54.81
ºn Cassiopeae 6o |o 4o 3 || 32 59 || 95.75 || 3 || 2 | | 1 || 9°335 | 4 || 26 || 1 || 320 3, 8 *s 4I '8o
tº a tº a Io9'60 || 3 || 23 || 1 || 7'907 || 6 || 41 || 1 ||268 || 4, 7% * 54°oo
65 Piscium 61 |o 41 5o 63 6 || 1 18° 16 || 6 || 34 || 2 || 4’391 || 8 || 4 I 382 e * 54."O3
36 Androm. 73 |o 46 57 || 67 II || 317°82 || 14 || 79 || 3 || 1'o62 || 6 || 18 || 2 || 520 || 7, 7} - 39 %
319°35 | 3o |I6o 5 e e i < * 4 16 wº- 4o'98
1'o60 | 16 || 82 || 3 || 353 * * tº- 4 I*O3
321-24 | 15 94 || 3 || 1: 1 oz. 14 99 || 3 || 54ol 63, 7 — 41°87
322'93 | 12 44 || 2 | I too7 II | 39 || 2 || 435 Pr. Cr. 42-94
3.24°53 |19|| 76 || 4 || 1' 117 | 19 77 || 4 || 35o — 43'88
• * 32. I*41 ..] 5 || 9 || 2. tº º P. W. '99
328'97 20 146 || 5 || 1: 120 | Io 46 || 3 ||38o º- 46'94
. . . . . I "I 24 || 4 || 19 I I 475 Sph. Cr. '96
329°36 || 6 || 48 2 378 P. W. 47.92
329'97 || 2 | 8 || 1 || I'227 || 4 || 14 || 1 || 184 Sph. Cr. '93'
334°52 Io 63 || 2 || I'o'78 || 8 || 3o || 2 ||472 P. W. 53.87
336'57 | 8 || 27 || 2 || 1 218 || 8 || 55 || 2 || 343 • * Pr. Cl’. '89
334°44 || 10 | 66 || 2 || 1' 17o Io 46 || 2 || 308|| 6’2, 6'7 || Sph. Cr. ‘90
to tº e tº 335'88 || 5 || 39 || 1 || 1'227 | 6 || 53 || 1 || 815 tº º P. W. 54.75
Amonyma 86 o 57 17 | 96 17 | 167°64 17 | 73 || 4 || 12 511 || 14 49 || 3 || 248 || 7, 8 *- 41-61
42 Coti 113 || 1 12 8 91 18 || 331'42 | 17 | 82 || 3 || 1 to 14 || 6 || 19 || 2 || 34o 6%, 7% º- 42'64
335'64 II 22 || 2 || 1 185 || 1 1 || 23 || 2 || 35o º e Pr. Cr. 43'86
{º º . . . .338-47 I 5 || 88 || 3 || 1' 164 || 14 || 71 || 3 |409 || 6’7, 7' 5 || P. W. 54-51
P. 1. 123 138 || 1 28 12 || 83 7| 24, 18 ||61||283 13 I '404 |42 |169 || 9 || 367 || 7, 7 + *- 41 ° 54.

Micrometrical Measurements of Double Stars.
s
7


, - g; ă +3 l ; # a a § | § § # +
| Designation. ; £ 3| R.A. N.P.D. Position.lº # #|Distancelº #. # Å. É 8 # 3
g;z 1850. 1850. : | 3 || 30 ; # |3| | | #. 2 g; bo
- %3 # | P: |z. #| #|*|| 3 || 3 || 3 || 3 "
l— O O > >
h m 8 O y O A/ -
P. 1, 123 138 || 1 28 12 || 83 7 || 23°35 || 4 || | 1 || 1 || 1:440 || 4 || | 1 || 1 || 35o Pr. Cr. |43.85 |
(continued) 29°38 || 13 || 51 || 3 360 || 7-2, 7-3 | P.W. 53.81
* * tº º tº gº º º I ‘262 | Io 40 || 2 || 353 * 54°og
Anonyma 155 || 1 36 19|81 16 || 328°88 || 33 |171 || 6 tº e 27o 73, 8 — 42°8o
tº tº * * • - 1 4'659 22 || 13 || 4 || 255 gºmº *45
329°88 || 5 || 12 I | 4'604 || 5 || 1 I I | 35o & ſº Pr. Cr. 43'87
33o'o6 || 3 || 15 || 1 || 4-697 || 6 || 29 || 1 ||268 || 73, 7} | P. W. 48-94
329'oz | 3 || 20 || 1 || 4-636 | 2 | 6 || 1 308 || 7-5, 7-6 || Sph. Cr. 53°92
tº g 328°46 || 6 || 37 || 2 || 4'591 || 6 || 32 || 2 || 31o 17:7, 8.2 | P.W. ‘94.
y Arietis 18o I 45 18 || 71 27 || 358-85 || 6 || 46 || 1 || 8'98o | Io |Ioo il 435 4. 4} + — 46'95
* tº . . . .358:20 || 8 || 57 || 2 || 8-621 | 16 91 || 2 | 184 || 4, 4 +| Sph. Cr. 4793
o, Piscium 202 || 1 54 18|87 58 || 33o'38 || 8 || 51 || 1 || 3:479 || 8 || 45 || 1 || 185 tº º Pr. Cr. 42'95
33o'o6 || 5 || 22 I 3oo || 4, 6 P.W. 46-92
º & g e g 3.28° Io || 8 || 53 || 2 || 3'420 Io 5o || 2 |4Io tº ſº º 53'99
y, Androm. | [38] | 1 54 43 |48 24, 111°21 |26|| 17 || 4 || o'62 |est. 6 || 4 |466 5, 5} | – |47.82
Io9'53 27 |131 || 4 || o' 55 |est. II || 4 || 438 || 44, 5} gmms 53°79
g 1 12'or || 7 || 36 || 1 || o'608 || 6 | 18 || 1 }: . —- 54*75
Io Arietis 208 || 1 55 9 || 64 47 || 3o’ I 5 || 9 || 45 3 298 || 64, 8% sº 47'90
tº º tº tº 1733 || 4 || 23 || ||375 tº § sº 49°oo
3o'66 Io 62 || 2 | 1838 Io 46 || 2 || 410 || 6’ 5, 8'5 sº 53°92
Amonyma 218 2 1 4 91 9 || 248° 58 17 | 61 || 3 e & 244 || 8%, 9 * 42°42
e tº 4'832 || 20 | 64 || 2 || 242 *= 4I '95
º 248°35 | 5 || 34 || 1 || 4'907 || Io 5o | I | 20c — 54°o7
Anonyma. 22 I 2 1 24 || 7o 22 || 143’52 29 |130 || 7 || 8°433 20 | 72 || 4 || 203 || 8, Io dº 42° 33
I43' 14 || 7 || 19 || 2 || 8: 153 || 7 || 20 || 2 || 35o 3, Io; Pr. Cr. 43°41
tº º tº e º º 144'oZ | Io 55 || 4 || 8:463 || 14| 78 || 3 |272 | 738, 9.2 | P.W. 54'50
Arietis 65 (Bode)| 240 || 2 8 47 | 66 49 tº tº 4'7or || 6 || 19 || 1 || 185 . . . — 4.1°95
w 49 4o | I 7 | 89 || 3 tº gº 281 7%, 8% sº 42'96
49°2O || 4 || 23 || 1 || 4'676 || 4 || 2 I | 1 || 185 Pr. Cr. 42°95
e e tº gº 48°75 || 3 | I 5 || 1 || 4-768 || 4 || 19 || 1 || 268 e e P.W. 54'07
a Cassiop. A & B | 262 |2 1646] 23 17| 271.76 || 8 || 45 || 2 || 2:237 || 6 || 26 || 2 |460 || 5}, 7} * . 4o'91
a • 265 50 || 3 || 22 || 1 || 2:238 || 4 || 25 i 38o 5, 7 sº 48°o9
* Cassiop. A & C Io'7' 57 || 6 || 39 || 2 e is ... ." | 840 5}, 9} tº 44' 3O
e ‘º tº º 4 * 7'773 || 4 || 26 38o 5, 9 — 48°o9
P, 11. 89 269 |2 19 24 6o 48 || 339-90 11 || 31 || 3 || 1926 || 6 || 15 || 2 |353 8, 9} — 4o'96
342-63 || 3 | 20 || 1 || 1931 || 4 || 20 | 1 || 3oo 8, 9} — 47°o8
341 '59 lo 48 || 2 | I '918 Io 42 || 2 || 276 || 7-6, 9°o — 54°o2
tº gº tº tº tº º 342'3 I | 3 | 12 || 1 || I*753 || 4 || 1 || || 1 || 184 Sph. Cr. 54°o9
y Ceti 299 || 2 35 32 87 24 || 289°54 || 8 || 38 || 2 || 2°815 || 8 || 28 || 2 || 360 || 3, 8 P.W. 4o'og
tº dº * * 288:35 | 13 | 68 || 3 || 2:745 Io 36 || 2 || 413 || 3, 84 gºmºsºm 4. I ‘O2
288 Rev. W. R. DAWEs, Catalogue of





& F | # # § wº s: | 5
Q) 9 || “.S ſº O e ſº Q) 3 . O
Designation. # ź #. Nº. Position. # # # Distance. # # # ; # ă 3. ;
- C/2 . # B |2. #| = |z| 5 || 5 || 3 ||3%
S. 3 5 > || > > || >
h m 8 o / O // - -
y Ceti 299 || 2 35 32 |87 24 || 288’96 |32 |2 15 || 5 || 2:70o |z2|127 | 5 || 413 || 3}, 7} | P. W. 41'98
(continued.) º 285'5o 13 53 || 5 || 2:655 | 13 || 56 || 5 || 35o 3, 8% | Pr. Cr. 42'99
e 288'92 || 6 || 24 || 1 || 2'692 || 6 || 24 || 1 |420 || 3, 7 P. W. 43°ol
[288’90 || 59 |345 | 11 || 2:719 |46|215 Io |404 || 3}, 7} | – |41'65]
289°o2 |24|164 || 6 || 2'789 | 16|12 || || 3 || 414 || 3, 7 — |46'98
289°25 || 8 || 56 || 2 || 2'592 || 4 || 20 | 1 || 503 || 3, 7 - 47'91
289°54 15 | 84 || 3 || 2:8oo |12 || 53 || 3 || 391 - 54'o6
e [289°21 |47|3o4 II || 2:772 |32 |194 || 7 |424 || 3, 7 — |49°o8]
Anonyma 3oo 2 35 43 |61 I 1 || 299'39 || 8 || 45 || 2 || 3'oz9 || 8 || 39 || 2 || 386 || 7, 7 - 47' 27
Arietis 114 B | 305 |2 39 o|71 16 || 324*73 ||35||171 || 6 || I’965 |32 |156 || 4 || 312 || 74, 8 - 4. I'94.
326’ I 5 || 7 | 20 || 2 || 1929 || 7 | 18 || 2 |350 | 73, 84 | Pr. Cr. 42°96
e 324'68 || 9 || 4o 2 tº º 3oo 74, 84 || P. W. 44°o3
324'77 || 9 || 55 || 3 || 2:212 |18 || 87 || 3 ||38o || 73, 84 - 47.77
322°38 || 5 || 38 || 1 || 2:324 || 4 || 19 || 1 || 353 || 74, 8 — | 51°99
322'48 || 18 |Io9 || 4 || 2:331 |22 |113 || 4 || 342 || 7, 8 - 53'89
Q & tº e 321-80 || 5 || 32 || 1 || 2:264 || 6 || 34 || 1 |203 || 7-7, 8.5 |Sph. Cr. 54-84
s Arietis 333 |z 5o 39|69 16 || 195'48 |43 |228 || 8 || o'711 |28|153 || 4 |435 | 6, 6} | P. W. |41’94
195'88 || 13 |io4 || 3 || o'84 |est. 4 || 2 |584| 6, 6% — |46'98
tº gº o'845 | 10 | 69 || 1 ||475 6, 6% | Sph. Cr. 47°83
195'68 || 11 || 71 || 3 398 || 54, 6 | P.W. 47'92.
196'32 || 5 || 33 || 1 || o'993 || 4 || 11 || 1 || 5oo 5, 54 || – || 49'oo
© tº tº tº 195'55 || 6 || 31 || 1 || I'oog | 6 | 12 || 1 || 353 & © - 53°99
Anonyma 369 || 3 7 24 || 5o 4 || 26'81 || 9 || 5o 2. tº e tº e 33o 64, 8 - 42°46
º 3'823 || 4 || 18 || 1 || 360 e - - 4o’ I 5
27'72 || 5 || 35 | 1 || 3’512 || 4 || 24 || 1 || 184 || 7, 8 || Sph. Cr. 47°93
G e & Gº 26-83 || 1 || 69 || 3 || 3:622 || 14 || 83 || 3 ||362 || 7, 8 P. W. 51°50
95 Ceti A.C. 2 || 3 Io 42 |91 29 || 73’ I 5 || 9 || 20 || 3 || O'73 |est. 6 || 3 |420 || 5%, Io - 54'81
Anonyma [59] | 3 30 15|44 28 || 348'58 || 6 || 52 || 2 || 2:28o || 4 || 23 || 1 || 3ool 73, 8% - 47°O4.
tº e tº e 348°45 || 8 || 43 || 3 || 2'378 20 |114 || 3 |296 || 7-7, 8' 5 - 54°o.9
Anonyma 425 || 3 30 39||56 23| Ioz'78 || 15| 62 || 3 || 3'org | 14 5o || 3 || 333 || 7%, 7% - 4o'8o
- IoI '73 || 3 | I 5 || 1 || 2'806 || 4 || 22 || 1 || 184 º Sph. Cr. 48° 13
Io2*76 || 9 || 5 I | 3 tº º - - 301 || 7, 73 || P.W. |48°66
2°864 || 8 || 35 || 2 || 322 — |48'98
tº º tº a Io2°o3 | Io || 71 || 2 || 2:719 || 8 || 58 || 2 || 3 Io 7-2, 7 3 - 54°o3
P. III. 170 [65] | 3 41 19 |64. 53| 202'85 || 8 || 21 || 2 || o'663 || 6 || 24 || 1 |455 || 64, 6% {{\c. 47-88
32 Eridani 470 || 3 46 46 | 93 24 || 345'45 || Io 5o || 2 || 6'88o || 14 || 78 || 2 || 3 Iol 5, 7 P. W. 4 I '97
346'53 || 8 || 52 || 2 || 6′481 || 8 || 51 || 2 || 268 || 5}, 8 || Pr. Cr. 43°o2
345 67 || 3 || 24 || 1 || 6’716 || 4 || 18 || 1 || 184|4, 6 || Sph. Cr. |48'13
º º e 346. 38 Io 5o || 2 || 6’ 653 || 8 || 39 || 2 || 322 || 5, 6} | P. W. 53' 18
Anomyma 494 || 3 59 58 || 67 18 5' 115 lo 65 || 2 |245 .. — |4 I'98
Micrometrical Measurements of Double Stars. 289



...? à à * w; * -d
... [sãs R.A. N.Pol.......lilălăl, #|#| 4 || | | # | #,
Designation. : 32. 1850. 1850. Position. : # #, Distance. : .# #. * ‘E à º g
%3 # a |Z # B |z|| 3 | # .9 $ 3
t–º O O : 3. >, | =
h m 8| o , r) A/
Anomyma 494 || 3 59 58 || 67 18 || 186’41 |28 166 is tº 292 || 7#, 8 P.W. 43:13
(continued) 186'67 || 3 | 16 || 1 || 5’oo? | 4 || 26 || 1 || 184 || 7%, 7% |Sph. Cr. 48: 13
187°o 5 || 3 || 1 I | 1 || 5' 178 || 3 || 10 || 1 || 412 º Pr. Cr. 53' 13
& © 186’ 32 || 1 | 73 || 3 || 5'o61 |14. ||ro 1 || 3 || 353 || 7-5, 7-9 || P.W. 53'48
Anonyma 520 || 4 9 19 || 67 34 || 98-99 || 7 || 75 || 3 || o'87o |12 || 54 || 2 || 447 || 8, 8% — 4 I 52
e - . . . tº - Ioz'90 || 5 || 17 || 1 || O'975 || 4 || 8 || 1 || 353 - - 54." I 3
Tauri 230 B 535 || 4 I 5 o 78 59 tº g * tº I '95 I |22 |IO4 || 5 || 34o º a- 4. I'4. I
345:56 |39 178 9 © to 342 || 8, 9} - 4 I'83
347° 30 || 4 || 8 || I I '822 || 4 || 8 || I | 35o tº Pr. Cr. 43°o?
344-62 | 6 || 4o || 2 | I '928 || 4 || 34 || 1 || 3oo 7%, 8% P.W. 47'oq
34.3' 67 || 3 | 12 || 1 || | 85o || 4 || 12 || 1 || 184 || 7%, 8% Sph. Cr. 48' 13
342°73 I 5 74 || 3 tº º 309 || 7: 1, 8° 3 | P. W. 54°29
* - • e tº º 2'o62 || 8 || 37 || 2 || 326 - 54'82
Anon. II. II, 54 546 |4, 18 16 || 7 || 13 - tº © tº 7' 2 I 9 || 4 || 12 || 1 || 32O - 4o’94
187. Io | 8 || 27 2 tº a 360 | 84, I - 41°46
187°oo || 3 || 23 || 1 || 6’747 || 4 || 30 || 1 ||268 7.7, 9' 5 - 54°og
8o Tauri 554 || 4 21 36 || 74 42 1 665 || 4 || Io || 1 || 360 - G - 4O' Io
e - I 2'51 |3o |132 || 7 .. * - 34o || 64, 9; — 43’ og
Anonyma 559 || 4 24 52 | 72 18 277-25 |16 | 89 || 4 || 2'953 |20 96 || 4 || 291 || 7-2, 7'3 - 52°o8
Anonyma 648 || 5 I 18 || 58 9 || 73°og |18 |126 || 5 || 4-645 24 |Iot | 4 || 290 || 7-6, 8' I - 46'59
14 Aurigae 653 5 5 38||57 29 225-86 || 9 || 62 || 2 || 14-914 || 8 || 37 || 2 |229 || 5'7, 8°o - 47-78
Anonyma 694 || 5 14 49 || 65 12 || 357.75 |17 | 73 || 3 || 1: 199 || 8 || 24 || 2 ||263 || 9, 9 + | – || 41°8o
- e º º 358-46 |ro 5o || 2 | I 330 || 9 || 45 || 2 || 268 || 8%, 8% + | Pr. Cr. 43°20
* Orionis D 5 || 5 16 56 92 32 88.70 || 3 || 7 || 1 || o'947 || 4 || Io || 1 |475|| 4, 5} - 48° 11
86-60 |58 |299 || 9 || o’935 |45 |182 || 7 |42 || 33, 5 | P.W. 48:20
--> . - - * - 86-28 |20 || 7 || || 4 || 1 °C 86 || 6 || 33 || 4 || 444 || 3%, 4% — 51°69
º D 6 || 5 21 28 93 26 8o 30 || 7 || 3 || || 2 | o'816 || 6 || 14 || 2 || 353 || 7-2, 7-5 - 54." I4.
32 Orionis 728 || 5 22 46 | 84 Io | 205'o8 |13 || 79 || 3 || o'893 |12 || 52 || 3 || 55ol 5, 7 - 44'94
Tauri 38o B 742 || 5 27 26 | 68 6 || 249-69 |16 || 88 || 3 || 3:277 |18 || 21 || 3 || 347 || 7, 7} *- 4 I'62
249'85 || 6 || 28 || 1 || 3:286 || 6 || 29 || 1 || 185| 7, 8 || Pr. Cr. 43' 17
251'o6 || 3 | 18 || 1 || 3'343 || 4 || 13 || 1 || 184 || 74, 8 || Sph. Cr. 48' 13
251'41 7 || 54 || 3 || 3: 235 |12 || 91 || 2 || 268 || 7' 1, 7-6 || P. W. 54° 14
º 5 28 I | 95 31 || 125'91 || 5 || 50 || 4 || 3: 618 || 0 || 32 || 2 | 208 || 6, 1 I - 44'68
1 Orionis 752 || 5 28 6 96 I 141-28 || 6 || 39 || 2 || 1 1-628 |Io 61 || 2 || 4ool 3, 7% º- 47-65
L Io 567 D 3 || 5 28 33 95.44 18373 || 1 || 29 || 3 || 1 + |est. ... | 3 || 335 | 73, 8 *- 49°43
26 Aurigae 753 || 5 29 o 59 36 || 268-25 || 1 || 73 || 3 || 12:42.3 |12 || 76 || 3 || 296 || 6, 8% - 44'84
& Orionis 774 || 5 33 12 92 2 || 146' 59 |36 246 || 7 || 2: 67 I |3o 156 || 6 || 432 || 2, 5% - 4I ‘O2
148°41 |12 || 48 || 2 || 2'573 || 2 || 47 || 2 || 35o 2, 6 Pr. Cr. 42'99
148'73 (28 208 || 6 || 2: 627 |32 |155 || 5 || 470 || 2, 5} | P.W. 47.84
148.70 || 2 || 8 || 1 || 2: 639 || 2 || 6 || 1 || 412 Pr. Cr. 53' 13
ROYAL ASTRON. SOC. VOL. XXXV.
P P
290 Rev. W. R. DAWEs,
Catalogue of





Designation. #3 . N.P.D. Position. # à # Distance. É # # # É # §§
- tº CO 1856. 1850. 5 || 3 || $9 5 || 3 |.S$ E § 9 : 3
%c # B |z # | 3 |z| 3 CŞ .9 § -
L–1 O O > | > >| | >
(ś 774. §3. 1. 92° 2'l 14922 || 5 || 3 | | | 2°483 || 6 || 29 || 1 |353] .. P.W. 54.17
Anomyma 835 | 5 55 30 || 71 43 | 1.45'64 || 6 || 25 || 2 || 2:452 | 8 || 36 || 2 || 314|8'o, 9'5 *== 48° 56
Aurigae 229 B | 918 || 6 2.1 57 || 37 26 || 323'54 || 8 || 62 || 2 || 4'596 || Io 64 || 2 || 364 || 7-6, 8:3 *- 52' 39
Anonyma 92. I 6 22 49 || 78 39 3'83 || 5 || 4o || 2 | 16:266 || 8 || 41 || 2 || 338|| 6%, 9} * 48°19
15 Monoc. A & B 95o 632 43 |79 58 || 209'32 |20 |II 5 || 5 || 3:075 | 18 || 9 || || 4 || 347 || 6, 9 * 42°og
12 Lyncis A & B 948 || 6 32 58 3o 25 | 1.48°42 || Io 61 || 2 || 1:72 I | 12 || 7o || 2 |450 || 54, 6 - 41 ° 20
I49°o 5 || 4 || 23 I I'57o I 1 || 1 || 35o 6, 7 | Pr. Cr. 43' 18
e e 143'35 || 3 || 17 | 1 || I-689 || 4 || 18 || 1 || 323 6, 6% | P.W. 48:22
12 Lyncis A & C 305'18 || 8 || 52 || 2 || 8:8o 1 || 8 || 44 || 2 |450 || 6, 9 *- 4I ‘2O
tº tº * @ tº Q 3oz'38 || 3 || I5 I 8°778 || 3 || 15 || 1 || 35o 6, 9 || Pr. Cr. 43' 18
38 Geminor. 982 646 11 || 76 38 || 169'58 || 12 || 72 || 3 || 6′o71 || 14 || 87 || 3 |283 || 5}, 8 P.W. 41-29
169°35 || 4 || 27 | 1 || 6′o98 || 4 || 21 || 1 || 185 e Pr. Cr. 43’ I 5
tº e 168°oo | Io 65 || 2 || 6′ooz Io | 66 || 2 || 305 || 5, 8 P.W. 51'45
Anonyma Jo27 | 7 3 29 62 32 || 326'79 || 19 | 89 || 4 || 1 182 | 17 | 84 || 4 || 35o | 73, 8 || Pr. Cr. 43' 17
324' 67 || 5 || 37 || 1 || 1:323 || 6 || 28 || 1 |467 || 7, 7+| P.W. 48°17
Anonyma Ioſo | 7 || 1 32 || 55 42 320:10 |22 |113 || 5 || 1904 || 14 || 46 || 3 |29o || 8%, Io *- 42°o7
tº & tº e * - 3 19° 52 || 3 || 14 || 1 || I'904 || 4 || 18 || 1 || 467 | 84, 9; *- 49°26
Anonyma | 1983 || 7 1644 |69 13 || 4321 6|31 || 2 | 6′784 || 8 || 3 || 2 |34ol 7, 8, — |40.65
44-83 || 3 || 21 || 1 || 6’180 || 3 || 2 || || 1 || 35o || 7, 8 || Pr. Cr. 43' 18
tº tº 44'oo || 2 | 16 || 1 6'573 || 4 || 29 || 1 || 268 || 8'o, 8.7 | P. W. 54° 18
Castor 11 Io i7 25 1 || 57 47 254-13 ||25 || 56 || 5 || 4.937 |26|153 || 5 || 38ol 3, 4 — 4o'2O
o 252°38 |34 |268 || 6 || 4'913 |44|3.16 || 6 |403 || 24, 3 - 42°o8
251.72 |24|155 || 4 || 4'87o 24|15o || 4 || 268 3, 3} | Pr. Cr. 43' 16
249'85 |z2|162 || 5 || 5°o 14 || 36|245 || 5 |462 || 24, 3} | P.W. 47'25
249'24 || Io | 67 || 2 5'14o 14| 5o || 2 | 184| 24, 4 || Sph. Cr. 48' 13
249' 16 |33 |239 || 7 || 4'977 |43 |292 || 7 || 540 || 2, 3} | P.W. 48°24
248'97 | 18|133 || 4 || 5'o27 | 24|164 || 4 |444 — 49' 32
s 248-11 || 46||333 |10 || 5'o68 |40 |288 || 9 ||61 I *º- 51*2I
246' 39 || 3 | 18 || 1 || 5'o'70 || 4 || 20 | 1 || 5oo * @ gº- 52'2O
245'87 || Io 52 || 3 || 5’ I 57 || 14 || 7o || 3 || 412 º Pr. Cr. 53' 13
e tº tº º . . . 246’21 || 31||198 || 7 || 5’og 8 |32 |194 || 7 || 537 o P.W. 54°23
Cancri 17 B | 1177 |756 25 | 62 3 || 351-46 || 13|8o || 3 || 3:760 | 14|89 || 3 ||360|7, 7} | – |40'12
* @ tº tº tº ºn º 351.38 || 8 || 67 || 2 || 3:418 || 8 || 64 || 2 |268 || 7'o, 7-5 *º- 54." II
& Cancri A & B | 1196 || 8 3 36 || 71 54 4:36 ||38||198 || 8 || I 188 |32 || 18 || 7 || 420 || 6, 6% — 4o°2O
e o:87 ||37 |2 Io || 5 || 1 "I 77 20 |Io9 || 4 || 447 || 5%, 6% *- 41' 16
e 356:26 |33 |257 || 6 || 1 182 ||38|275 || 6 |430 || 6, 6% * 42'22
º º * @ 355°o 5 || 35||190 || 8 || 1: 119 |37 |202 || 8 || 35o || 6, 6% | Pr. Cr. 43' 18
© e 338'50 || 6 || 26 || 1 || I'o49 || 8 || 20 || 1 |435 | 6, 6} |Sph. Cr. 48'13
Q 338 12 || 35|223 || 6 || 1'o61 || 36||192 || 6 || 521 || 6, 6} | P.W. 48-24
& e 334’2 I 23 I34 || 5 I I I I 22 || 92 || 5 || 421 || 6, 6% *- 49°29
Micrometrical Measurements of Double Stars. 29 I




7. e w; !-- e * -d
..ºn o g: §: QD 3 Q 3
# = <! R.A. N.P.D #| # |g #| 3 || 3 | # | # # #, H
Designation. 5 # 9 tº -º & ... ." Position.] § † : Distance. § .50 # P- "E 5 ſº 8
#32. 1850. 1850 - § ; Sp ; § .89 | a § 5 § 3
dº eS Ca Z. Cº 2. cº; • gº-4 - § -
S. 3 3 * | = | = |:
e h m 8 O / O Z/
& Cancri A & B | 1196 || 8 336||7: 54 || 327-90 |30 220 || 7 || I'oio |32 |189 || 6 |497.| 6, 6% P.W. 51:25
(continued) 324'44 || 13 || 75 || 3 | I to 57 | 16 || 67 || 3 |458 || 6, 6% | – || 52°23
tº º e e - 315-31 || 13 || 92 || 3 || o'977 | 16 || 85 || 3 || 525 º ſº- 54°2O
& Cancri A & C | . . º º tº º 145'58 || 31||165 || 6 || 4:968 |32 ||143 || 6 |443| 6, 64. am- 4 I'o'7
tº e º e e - g tº 146-69 || 11 62 || 2 || 4'946 | 11 || 6o || 2 || 35o tº e Pr. Cr. 43'22
©, Cancri 1223 || 8 1742 |62 35 | 212 58 || 3 || 23 || 1 || 4'946 || 4 || 29 || 1 || 360 | 6, 6--| P.W. 4o'15
* 9 & 4 tº º e tº 214' 35 | 8 || 58 || 2 || 4.637 || 10 || 70 || 2 |268| 6′7, 6-8 - 54." I 3
vi Cancri 1224 || 8 1744 || 64 59 || 38-28 || 13 | 73 || 4 || 6’238 |12 || 74 || 3 || 325|| 6%, 7 — 4o'88
39:76 || 9 || 52 || 2 || 5'869 || 6 || 37 || 2 || 268 || 7%, 8% | Pr. Cr. 43' 17
tº - tº q e e e - 39-89 || 14 |Ioo || 4 || 6′o34 16|io 1 || 4 || 353 || 6%, 7 P. W. 49' 54
Anonyma | 1263 || 8 35 16 || 47.46 || 13:22 || 3 || 15 || 1 || 14-290 || 6 || 24 || 1 | 185| . . — 4 I ‘33
e tº a 17: 10 | 6|| 47 || 2 || 22'474 || 8 || 53 || 2 || 268 || 8°o, 8' 5 — 54' I 3
s Hydrae 1273 || 8 38 5o 83 2 | 201:59 |8o 421 |16 || 3'504 || 54 277 || 1 || 388|4, 9 — 4o'95
203-48 || Io 46 || 3 || 3:426 to 43 || 3 || 35o 4, 8% | Pr. Cr. 43'2 I
2O5°75 || 3 | I 5 I 3'428 || 4 || 24 || 1 | 184 || 3}, 7 || Sph. Cr. 48'14
206'72 | 12 || 82 || 3 || 3:506 || Io 56 || 3 || 398 || 3}, 8 P.W. 48.83
* * tº tº e - . . . 208:48 || 5 || 35 | 1 || 3'435 | 6 || 39 || 1 || 353 || 3}, 8 — | 5 I 32.
P. VIII. 200 | [195] | 845 56 81 1 || 138°o? | 13 92 || 4 || 9'512 18 9o || 4 || 366 || 7-4, 7-9 tº- 5I '39
o, Ursae Majoris || 1306 || 8 57 7 || 22 16 || 262-83 || 8 || 46 || 2 || 4°466 || 8 || 42 || 2 |450 5}, 9} - 4 I*2O
258-21 || 6 || 43 || 2 || 3°925 | Io 59 || 2 || 382 || 5, 8% - || 5 I 28
• * tº e e - • * 256°oo || 5 || 29 I 3'478 || 4 | I 2 | I | 203 tº a Sph. Cr. 54-84
Cancri 194 B | 1311 || 8 58.48 ||66 25 | 200-67 |22 || 16 || 5 || 7' 516 || 24|144 || 5 || 324 || 7, 7} | P.W. 41'86
201'o6 | 12 || 76 || 3 || 7' 164 | 12 || 76 || 3 || 295 || 7}, 7} | Pr. Cr. 43°2. I
- e. q tº - e - 200-81 || 6 || 5o | 2 7:270 8 || 6o 2 |268 || 7-2, 7.4 P.W. 54'12
Anonyma [197] | 9 || 42 | 86 27 || 56'97 | Io || 65|| 2 1.204 || 8 || 36 || 2 || 364 || 74, 8 º- 49' 5 I
Anonyma 1321 || 9 4 13 || 36 4o 50-61 || 13| 86 || 4 || 20'315 18| 81 || 4 || 288 || 7%, 7% tº- 4 I'54
- e. tº e * - * * 51.83 || 3 || 25 I | 19'874 || 4 || 32 I | 353 || 7%, 7} + +- 48°29
Lyncis I 57 B | 1338 || 9 11 35 | 51 11 || 125'90 15|Io5 3 I'754 || I4 || 92 || 3 ||38o 7, 7 + e- 4 I’23
• e • e G - e - 127'33 |18 || 18 || 3 || 1:723 |18 |Io5 || 3 ||38o || 7, 74 - 42°23
127:78 || 5 || 3 | | I I'665 || 5 || 34 || 1 || 350 | 6, 7 | Pr. Cr. 43' 17
131-82 | 13 | 88 || 3 || 1:666 24|111 || 3 |467| 7, 7} | P.W. 48: 17
131.97 || 8 || 55 || 2 | 1696 || 8 || 44 || 2 |421 || 7, 7+| – 5o" 12
- - * * º e e - I 34°64 || 23 |I5 I 5 I'650 |22 |125 || 5 |406 || 6'9, 7' I *- 54°2O
Anonyma 1355 9 19 23 83 7 || 326-28 || 1 o' 61 || 2 || 2:666 | Io 45 || 2 || 353 || 8.2, 8:3 * 52'63
a Leonis 1356 || 9 20 25 | 8o 18 || 346’23 || 6 || 26 || 2 | o'546 || 5 || 14 || 2 |457 || 6’4, 7-2 - 54."23
Hydrae 134 B | 1365 || 9 2 3 47 |87 53 | 159'45 || 6 || 39 || 2 || 3°290 16|Io3 || 2 || 368 || 7, 8, — 48' 2.5
8 Sextantis A.C. 5 || 9 45 5 97 24 || 5o' 54 || 8 || 26 || 2 | o'55 |est.| 4 || 2 || 382 || 6’o, 6' 5 tº- 54°2O
Anonyma 1399 || 9 48 45 || 69 32 || 175°o 1 || 8 || 57 || 2 || 29°972 || 8 || 56 || 2 || 353 || 7-2, 8' I - 5 I ‘29
y Leonis 1424 |Io 11 42 | 69 24 || IoS'82 | 15| 6o || 3 || 2:838 | 12 56 || 2 || 390 || 3, 4 tº- 40°29
I of 21 | 12 57 || 2 || 2:832 || 4 | I 5 || 1 || 510 || 3, 3} tº- 4 I'23
292 Rev. W. R. DAWEs, Catalogue of

r- wh o, º º º -d
- {{ P |#|#|s #|a|s|| 3 | # |}.
Designation. É #3 . : N § * Position. É .# # Distance. ; # | # º # g º §
90 c. .3 B: 2 .3 : z. § ..Sº § 2.
L-1 |O O > >. > >
h m B Sº y O &t - I -
y Leonis I424 |Io II 42 69 24 || Io9'56 12 || 69 || 2 || 2:7 19 4| 29 || 1 || 42 o 24, 3 P. W. 42-33
(continued) Io'ſ 39 || 8 || 47 || 2 || 2:850 8 || 46|| 2 || 35o 23, 3} | Pr. Cr. 43'26
107.82 || 8 | 66 || 2 || 2:802 || 10 || 79| 2 |63 23, 3} | P. W. |47:28
tº tº 2.734 || 10 | 86| 1 |475 23, 4 |Sph. Cr. |47:30
Io9'57 || 5 || 33 || 1 || 2'893 || 6 || 43 || 1 | 184 || 3, 4 — 48' 13
g Io9' 15 20 | 1.48 || 5 || 2:824 18 131 || 4 || 592 2, 3} | P. W. 48°46
Io8'76 | Io || 8 || || 2 || 2:807 Io 83 || 2 || 64o - 51.87
. . . • * & tº Io9'76 | 15 Iro || 3 || 2:846 18 I 38 3 || 74o & e *- 54'37
tº: B } 1426 ro 12 41|82 49 || 257'71 | 18 69 || 3 || o'73 est. 3 || 8 || 3 || 3oo 8, 8% — 42:30
Leonis 145 B | 263-28 || 5 || 19 || 1 || o'885 4 || 8 || 1 353 7.6, 8'o -* 54' 16.
A +B & C | 9°37 || 6 || 20 | 2 - e. 326||76.8°o, Io'o - 52°33
2. tº ºn e e tº º tº 7'632 4 || 2 O || 1 || 353 tº tº - 54' I 6
Anonyma 1429 |Io 1642 64 37 || 265.78 |12 || 76|| 3 || 1:373 || 20 || 9 || 3 || 353 |8-6, 8.8 - 49'76
Anonyma 1442 |Io 23 43| 67 12 || 154'65 || 7 || 53 || 2 |13' 307 7| 46 || 2 || 353 || 7' 5, 8°o - So"22
49 Leonis || 1450 ||o 27 Io 8o 35 | 155'43 || 8 || 31|| 2 || 2:586 || 8 || 37 || 2 || 3o4 6, 9 — 48° 53
Anonyma 1457 |io 3o 54|83 29| 302-75 | 8 || 43 || 2 | o'925 | io || 32 || 2 |440 |82, 9°o | – || 50-78
35 Sextantis 1466 || o 35 34|84 28 || 239'91 |zo 104 || 6 || 6-752 28 || 137 || 6 || 377 | 6}, 7 — || 4 || '57
239°35 | I4 || 8o || 4 || 6’ 698 14 || 8 || 4 || 309 || 6}, 7} | Pr. Cr. 43'24
239'87 || 5 || 35 | 1 || 6'874 6|| 3o || 1 || 184 6, 7} | Sph. Cr. |48: 14
* - º 24o'23 || 9 || 62 || 3 || 6′564 | 16 || 1 io || 3 || 416 6, 7 P. W. 52'99
54 Leonis 1487 |io 47 29. 64 27 | 103-84 || 8 || 27 | 2 || 6’221 6|| 15 || 2 || 345 5}, 8 — 4o'30
103'77 || 8 || 57 || 2 || 6’206 8 || 48 || 2 || 4 Io 4}, 7 tº- 48:22
tº e tº e Io9'89 || 7 || 51 || 2 || 6’ 305 8 54 || 2 || 382 || 5, 7 - 52°o7
P. x1, 9 1517 || 1 5 48|69 3 || 185:77 || 8 || 32 || 2 || 1'oo 5 8 26 || 2 ||37 || | 73, 8 *º- 49°45
& Ursae Majoris | 1523 || 1 Io ſo. 57 38|| 150-85 |28|179| 6 || 2:455 24 143 5 37o 5, 5} *- 40'29
147'97 20 || 1 18 || 4 || 2:404 || 16 || 90 || 3 || 435 | 43, 4} * 4 I ‘2 I
144*76 || 2 || || 143 || 4 || 2:441 18 Io 1 || 4 || 420 || 43, 4} — 42 2.7
142' 17 | 28 167 || 7 || 2:481 28 166|| 7 |279 || 43, 5 || Pr. Cr. 43'28
I 3 I-65 || 5 || 25 || 1 || 2:579 4|| 38 || 1 ||475|| 4, 4} |Sph. Cr. 47'30
I 3 I ‘43 || 5 || 45 I 2'753 || 4 || 38 || 1 || 690 || 4, 4} | P. W. 47'34.
I29'55 || 4 || 26 || 1 || 2:705 4| 24 || 1 | 184| 4, 4} |Sph. Cr. |48'13
I 29°33 II | 93 || 3 || 2'938 20 | 156 || 2 || 467 || 4, 4} | P. W. 48' 19
126'58 ||25 | 193 || 5 || 3'or 3 | 16 || 1 16 || 4 || 426 44, 4% *- 49' 30
122'93 || 8 || 65|| 2 || 2'985 | Io 87 || 2 |467 44, 4} — S I "3 I
tº a 3°o 5o || 8 || 35 || 2 || 437 || 3}, 4 — 52.' I 7
I 19'98 || 5 || 4o | 1 • * 375 *- 52°38
* & I I5'87 || 13 || Ioz | 3 || 2'957 | 16 || 115 || 3 || 541 tºmº 54'36
Leonis 339 B | 1527 || || 1 || 8 74 54|| 11'o6 || 6 || 34 || 2 || 3:935 8| 38 || 2 || 371 || 7-2, 9°o *- 49'23
a Leonis 1536 || 1 16 6|78 39| 87.61 | 15 76 || 3 || 2:445 |12 | 68 3 || 327 | 5, 8 * 4o'29
86,78 ||38|164|| 7 || 2:520 | 16 || 79 || 4 ||37 || 4, 83 || – |41:29
Micrometrical Measurements of Double Stars.
293




2% É * | * #| | | . § § § 3
P- • * || --> • * u) rº-3
Designation. : # #. * Position. f § #|Distance. # § # É # # #
ão # B |z. #| = |z| 3 || 3 || 3 | #3
l—l O O >| | E > || >
* lı m 8 o , O Z/
* Leonis 1536 || 1 16 6||78 39 || 85.34 17|107 || 3 || 2:456 || 14 || 58 || 3 ||38o 4, 7} | P. W. |42'27
(continued) 85-27 || 14 || 71 || 4 || 2:631 || 14 || 72 || 4 |350 || 4, 84 || Pr. Cr. 43'27
83'58 || Io 76 || 2 || 2:478 Io 78 || 2 |554|| 4, 8 P. W. 47.72
* * * * 2’650 || 4 || 28 || 1 || 184 || 4, 8 Sph. Cr. 48° 13
81: 58 || 8 || 39 || 2 || 2:641 8 45 || 2 || 364 || 4, 7} | P. W. 49'29
8o 67 || 15 93 || 3 || 2: 619 || Io 61 || 3 || 398 || 4, 8 -* 5 I SS
* * 79° 50 | Io 69 || 2 || 2:556 | Io 63 2. 445 º -*. 54'38
57 Ursae Major. 1543 || 1 zo 59|49 5o 7:20 | 11 || 65 || 3 || 5'524 || Io 6o || 3 |406 || 5%, 8% -> 48°7o
Anonyma | [241]|11 48 30|53 44|| 117'99 || 5 || 28 || 2 || 1:451 || 5 || 32 || 2 |457| 6-8, 8.7 | – || 53°37
Virginis 191 B | 1647 |12 22 57|79 27 | 207'o6 || 5 || 34 || 1 || 1:276 4 || 16 || 1 || 330 || 8, 8 + - 4o'3 I
tº e tº tº 2 11-72 || 13 | 72 || 3 || 1:230 | 12 || 38 || 3 ||372 || 7%, 7% - 5o'66
y Virginis 1670 || 2 34. 4. 9o 38 zoș’71 || 51 |235 | I I I I ‘241 |42 |I74 || 7 ||37 I 4, 4 -º- 4o°38
200°o 5 ||34 |187 || 7 || 1 579 |22 |12 || || 5 || 482 || 3}, 3} — 41-34
194'98 |47|277 || 9 || I'732 |4o |225 || 5 |407 || 33, 3} — 42°38
19275 || 2 | | 67 || 6 || 1.827 | 17 52 || 5 || 322 || 33, 3} | Pr. Cr. 43°37
191° 53 24 || 58 || 4 360 34, 3% P. W. 43°46
18377 | 15 to 5 || 2 347 — |46'89
tº º 2'45 I | I I 45 || 2 |28o — |46'91
182-83 Io 32 || 2 || 2:320 | 10 || 6o || 2 |475|| 33, 3} + |Sph. Cr. |47°29
182 15 27 |208 || 6 || 2:489 || 3o |238 || 5 |498 || 3}, 3} | P. W. |47°41
180°38 || Io. 56 || 2 || 2 637 io || 53 || 2 || 310|3}+, 3}|Sph. Cr. |48°36
180-60 |31 |216 || 7 || 2:603 || 36||232 || 7 |430|3}+, 3 | P. W. |48'38
179°o2 || 23 |132 || 5 || 2:850 |22 |I24 || 4 |414 || 3, 3 + - 49°37
176' 5o 23 |16o || 5 || 2'991 20 128 || 5 || 474 || 3} + , 3% -sº 5 I'4o
175°27 | Io 82 || 2 || 3"o 16 || 8 || 55 || 2 || 5ool 3, 3 -*. 52°32.
174: 16 || || 5 || os | 3 || 3'o65 I2 | 82 || 2 || 429 || 33, 3} --> 53° 36
172°53 ||33 |234 || 7 || 3' 195 || 36|246 || 7 || 542 || 3, 3 — 54°39
is tº a tº tº e 172'87 || 5 || 25 || 1 || 3'220 | 6 || 26 || 1 |404 tº º Sph. Cr. 54'40
35 * 1687 |12 45 54|67 56 36-60 |22 ||105 || 5 || 1 501 | 16 || 85 || 3 || 372 || 53, 7} | P. W. |42°39
* @ 38'91 | 12 || 4o || 4 || 1 “415 12| 41 4 i35ol 5}, 9 Pr. Cr. 43'34.
39°25 | I 5 || 83 || 3. e tº 388 || 5, 73 | P. W. 48'12
* - e. I'573 || 6 || 29 || 2 |421 | . . – 48.45|
40'92 |19|46 || 2 || 1:555 |12 || 43 || 2 |421 || 53, 8 — 49°33
tº 43'86 || 13 || 67 || 3 || I-618 I4 || 58 || 3 |409 — 53° 38
tº º tº e tº º 43-67 II | 60 || 3 | I 501 || Io 4o || 3 || 613 tº tº -* 54'4. I
P. XII. 230, 232| 1694 |12 48 5| 5 46 || 327:40 | Io 64 || 2 || 2 I-831 | 16|Io9 || 2 || 375 || 5, 5% -*. 48° 52
Anonyma 1690 |12 48 31|94 3 || 145'65 || 23 99 || 5 || 6’ I 59 | 16 || 64 || 4 || 306 || 8, io — 41-67
. . 145'93 || 5 || 27 | 1 || 6′o40 || 5 || 27 | 1 || 185| 8, 10 | Pr. Cr. 43°31
* tº e 145'62 || 2 || Io || 1 || 6′o27 || 4 || 11 || 1 || 278 P. W. 54-27
42 Comae Ber. 1728 |13 2 41 |71 41 198'51 | Io || 2 || || 3 || o'425 |est 2 || 362 -*. 4o'74
2.94. Rev. W. R. DAWEs, Catalogue of


rº w; w; * w; * , c.
- #2 RA. NPD #|#|s #| 3 |g| #| # | # |}.
Designation. à # Ž rºo. is go." Position. ; # |f|Distance. É # is * # § ſº §
ão |#| B |z #| = |z| 3 || 3 | # | #:
L–1 O , O s: I - >. >
h m sl o f | O *E* f/
42 Comae Ber. 1723 |13 241 71 41 Single |. tº º P. W. 42° 53
(continued) o Single tº º 5 * 43°45
14:21 |29 |148 || 4 || o'626 21 || 46 || 4 || 531 || 6, 64. | – || 53°o9 |
tº e 12*79 ||25 |177 || 5 || O'552 |28 |123 || 5 || 612 © º mº- 54’39
Anonyma [266] |13 21 4 73 29 || 326-35 | 6 || 32 2. & & ... |367| 7%, 7% tº- 5 I'24
... l . . * tº 1°o?6 || 4 || 22 || 1 |412 || 7-6, 8: 1 †- 54°27
P. XIII. 127 1757 |13 26 38 89 33 37°42 || 9 || 43 || 2 || 1:678 |12 || 5o || 2 || 360 || 7%, 8% amº 42°39
* * * * 38'82 | 12 61 || 2 tº ºn 3ool 73, 8% *s 43°45
25 Canum Venat. 1768 |13 30 47| 52 56 || 67'72 | 12 41 || 3 || O'993 || 4 || 8 || 1 420 || 53, 8 sº- 42'35
gº º 7o'36 || 8 || 19 || 2 || 1 oz.9 || 8 || 17 2 35o 5}, 8} | Pr. Cr. 43'35
ſº tº tº º 36'26 12 || 24 || 3 || o' 35 |est. 3 || 3 || 676 tº gº P. W. 54'43
P. xIII. 156 || 1770 13 31 42| 38 31 || 119°oo | Io 57 || 2 | I '753 8|| 5o || 2 || 375 || 6%, 8 &= 48°49
84 Virginis || 1777 |13 35 32| 85 42 || 233'37 || 1 || || 47 || 3 || 3'726 | 12 || 35 | 3 ||320|| 64, 9% * 4. I*24.
• e tº º * e 231.78 || 3 | 16 || 1 || 3:608 || 3 | 16 || 1 || 35o || 7, 10 | Pr. Cr. 43'34
Anonyma 1781 |13 38 36 84 8 || 238-65 || 9 || 33 || 2 || I-2OI 8| 20 || 2 || 3oo || 7%, 8 P. W. 42:31
ºr Boötis [27o] |13 4o 8 71 48 || 349-35 | 8 || 27 || 2 || 9'768 || 4 || 9 || 2 |465|4}, I I} $ºmsº 51'46
Boötis 76 B | 1804 ||14. 1 15 68 5 || 18-65 13 || 38 || 3 § tº tº e 223 || 8%, 9} +----> 4 I’39
tº 4'635 || 4 || 18 || 1 || 3oo – || 4 I ‘3 I
I9'65 | 12 || 29 || 2 © tº tº tº 8, 9 * 42°4′o
• - tº º 1995 || 3 || 22 || 1 || 4’369 || 4 || 28 || 1 || 353 | 73, 9 — || 48°43
Anonyma 1813 |14 5 54 83 54 || 192°17 ||38||177 || 7 || 4'948 |28|104 || 6 || 3o4|8%, 8% *g 42°27
tº º tº ſº 193'96 || 7 ||32 || 2 || 4'84o || 7 || 3 || || 2 | 185 & Pr. Cr. 43°35
§º } 1816 ||14. 7 14 6o 11 || 79°35 | 14 || 79 || 3 || I'688 16 || 79 || 3 |443 || 7%, 7% P. W. 41°88
.A.C. 4723
tº º , tº e tº tº 78.36 || | 1 || 38 || 3 || I'835 | 1 || 39 || 3 || 35o | 73, 8 Pr. Cr. 43'34.
Anonyma 1819 |14. 7 47|86 Io 6o 56 || 36||163 || 8 || I'o62 18 56 || 3 || 362 || 8, 8% P. W. 42°81
tº g tº tº 61'92 || 4 || 8 || 1 || 1 oz.2 || 4 || 8 || 1 || 35o || 8%, 8% + | Pr. Cr. 43°34
Anonyma 1834 |14 14 47| 4o 48 || 1 | 1.84 || 1 || || 39 || 3 || 1: 127 | 8 || 20 || 2 |470 || 7%, 7% +| P. W. 4o'54
ſº tº tº e tº ſº 112'o'8 || 8 || 4o || 2 || 1'ozo | 8 || 32 || 2 || 437 || 7%, 7% +| – 48'86
& Boötis 1865 |14 33 59 75 38 || 306'55 | 11 || 71 || 3 || 1 of 6 | 16|106 || 4 |455 || 4, 4 + || Sph. Cr. 48' I I
tº e ... ... 306'57 || 5 || 31 || 1 || 1 oz.9 || 10 || 51 || 1 |467 || 4, 4 + | P. W. 48°43
a Boötis 1877 |14 38 26|62. 17 || 32 o'89 Io 63 || 2 || 2'902 || Io 46 || 2 || 37o 3, 7} * 4 I'43
32.2' 19 |20 |159 || 5 || 2 672 |26|184 || 5 |474 || 3, 6; wº 48° 19
32.2° 52 || 2 | I 3 | I || 2 747 || 3 || Io | I 435 Sph. Cr. 48°45
tº e * * º e tº 322'99 || 15 |12o || 3 || 2' 686 18|146 || 3 |48o gº tº P. W. 54' 52
# Boötis 1888 |14. 44 28 70 16 || 324'o8 || 13 | 63 || 3 || 7 158 || 14| 59 || 3 ||370 || 5, 7% — 4o'43
323'37 || 5 || 20 || 1 || 7°268 || 4 || 12 || 1 || 3oo || 4, 7 * 4. I'42
322.67 || 6 || 49 || 2 || 7'oz9 || 10 || 71 || 2 || 360 || 5, 7 tº-º-º-, 42 "3o
322.75 || 5 || 25 || 1 || 6'702 || 5 || 25 || 1 | 185| 5, 8 Pr. Cr. 43°33
3.18.83 || 8 || 57 || 2 || 6-8o 1 || 14 || 82 || 2 |408 || 4%, 7 P. W. 47'44
wº 317-80 || 2 | 15 || 1 6'758 || 3 || 1 || || 1 || 435 | 5, 7 || Sph. Cr. 48’45
Micrometrical Measurements of Double Stars.
295




ſº (f) Ca * º º -d
# Al R.A. NPD #| 4 |g #| 4 |a| | | # # | #1
Designation. ##3 1333. is so. Position. : .# # Distance. : .# # º # ă º §
% c | #| B |z. } | B |z| || 3 § .3 § 2.
1–1 O O > > > >
h m s] o / O // -
# Boötis 1888 |14. 44 28 70 16 || 317.93 Io 64 || 2 || 6’713 || 8 || 53 || 2 || 314|| 5, 7 | P. W. 48° 5o
(continued) tº º & © 311'98 || 17 | to 5 || 3 || 6’264 15 63 3 I 3 tºms 54'46
39 Boötis 1890 ||14. 44 36|| 4o 40 || 44'58 || 4 || 23 2 42O || 5, 5} | – || 43°47
tº a * - tº e 43'63 || 6 || 42 || 2 || 3°753 | Io | 72 || 2 || 375 6, 6} | – || 48-51
44 Boötis 1909 14 58 51|41 46 || 235'76 || 51 |288 || 1 I 3'896 || 44 |216 || 9 || 384 5, 5} *-*- 4 I’25
235'88 || 6 || 36 || 1 || 3’790 || 3 || 21 35o 5%, 6 — 42*74
237 7o 13 |io2 || 3 || 4°21'o I4 82 || 3 || 489 || 5, 5} | – || 48-49
& 237-27 || 3 || 24 || 1 || 4’364 || 6 || 48 || 1 || 375 : 5, 5} | – || 49'48
236'74 || 5 || 34 || 1 || 4:498 || 6 || 38 || 1 |353 || 5, 5} | – || 51°52
237'77 || 5 || 36 || 1 || 4' 584 || 4 || 20 | 1 || 357 | . . — 54*74
Anonyma 1931 | 15 11 31 79 1 || 172 13 II | 86 || 3 || 13°208 || 14| 96 || 3 || 327 || 6-6, 7-9 gº 49'79
Coronae I B | 1932 || 5 II 55 62 7 || 28o:28 || 5 || 45 || 1 || I'413 || 4 || 26 || 1 || 435 6, 6% Sph. Cr. 48°47
281'o6 || 7 || 44 || 2 || 1:464 Io 54 || 2 |421 || 6}, 6} | P. W. 48-49
- 284.07 || 5 || 30 || 1 || 1:360 || 6 || 31 || 1 |404 º Sph. Cr. 54'4o
a Coronae 1937 |15 17 o' 59 Io || 1 1979 || 4 || I5 || 2 || o' 5 eSt. 347 6, 6% P. W. 39'59
- 135'88 I 7 || 54 || 2 || o' 5 est. .. 47o e * 40' 62
149-40 |32 || 45 || 6 || o'495 I | 3 || 1 |429 6, 6% === 41-65
156-63 || 9 || 4o || 2 || o'5 |est. 42 of 5%, 6 e-º-º- 42°58
19992 | 11 || 65 || 2 | o'63 (est. 3 || 2 |408; 5%, 5} | – |47-24
º 204:44 || 17 | 96 || 2 || o'652 || 3o | 84 || 2 || 603 || 5}, 5} | – || 48' 34
207-43 || 3 || 14 || 1 || o'692 || 6 || 16 || 1 |435 | 6, 6} |Sph. Cr. |48:47
218-28 || 8 || 34 || 2 | o'694 || 4 || 8 || 1 || 5oo 5}, 6 | P. W. 49-44
238°og | Io 3o || 2 | o'55o 5 2 |467 || 5}, 6 *= 5 I'42
& 250-14 || 3 || 6 || 1 || o'5 est. I 375 -º- 52'52
• * 273'34 20 || 41 || 4 || o'44 |est. 4|| 568 — 53°64
& © tº tº e & e tº 3o 1'47 | 20 | 67 || 3 || o'471 Io 20 || 3 |845 tº tº sºme 54'42
ºff. } 1938 |15 18 51| 52 8 || 306'oo | I4 67 || 3 || o'83o | Io 37 || 2 |433 8, 9 *=> 4o°39
c tº 303:23 29 |141 || 6 || o'859 I2 38 || 3 || 337 || 84, 9 — 41'66
3oo’97 io || 33 || 3 || o'85 |est. .. 42O 8, 8% wº 42°4′o
286 52 20 |105 || 4 || o'65 |est. 8 || 4 || 393 || 7%, 8 º- 47'30
284.95 || 5 || 9 || 1 || o'490 || 4 || Io || 1 ||475|| 8, 8% Sph. Cr. 47'30
281.25 || 5 || 27 | 1 || O'649 || 4 || 1 || || 1 |435 | 7, 8 gººms 48°47
28o-o; 15| 60 || 3 || o'632 || 17 || 41 || 3 |499 || 74, 8 || P. W. 48° 52
e 276. 12 | 12 53 || 2 || o'682 | 8 || 16 || 2 || 5oo || 74, 8 em= 49°44
e 266° 56' | Io 23 || 2 | o' 525 |est. 4 || 2 |467 || 7'5, 8°o * 5 I*42
Q & 262'22 || 5 || Io | 1 || O'55 |est. 2 || 1 || 375 *-º-º- 52°52
254'63 || 3 || 8 || 1 || o' 5 est. 2 || 1 || 353 *- 53°71
• e . . . e. e. ... 249-30 || 17 | 93 || 3 || o'567 || 1 || 37 || 3 |493 – 54°4. I
Coronae 17 B | 1950 15 23 33 63 58 || 92.82 | 8 || 4o || 2 || 3:263 || 8 || 43 || 2 ||375|| 73, 8% * 49'44.
3 Serpentis 1954 || 5 27 38|78 57 || 195'o'7 || 8 || 44 || 2 || 2'922 || 8 || 33 || 2 |41 ol 4, 5} cº- 40°4 I
296 Rev. W. R. DAWEs, Catalogue of

g; à | . #| | | | | | 3 || 5 | #
º P. .9 || 3 | tº • *4 tº re: § Q., +
Designation. # # #. * Position. # # # Distance. ; # ; f # # º #
*o. # à # || 3 || 5 | #
3 Serpentis I954. 1; 2% 38 7á s? 1961o I 5 || 77 || 3 2960 I4 || 64 || 3 ||347|4}, 6 P. W. 41-43
(continued) 4 tº 195.87 || 4 || 16 || 1 || 2:854 || 4 || 16 || 1 |350 || 4, 6 | Pr. Cr. 43'44
194-93 || 11 || 8 || || 3 || 3’oo8 || 14|104 || 3 |409 || 3, 4} | P. W. 48° 52
194'o8 || 6 || 47 || 2 || 3rog4 || 8 || 61 || 2 || 375|| 3}, 4 — 49'44.
tº tº º 194.26 Io 75 || 2 || 3'o63 | Io 76 || 2 || 410 || 3%, 4% - 52'58
& Coronae 1965 || 5 33 44 52 52| 3oo'78 || 6 || 46 || 1 || 6’209 || 6 || 47 || 1 | 185| 4, 5 | Pr. Cr. 43°63
3or-27 | 13 || 19 || 4 || 6′ 179 18|142 || 4 || 382 || 4, 5} | P. W. 47'99
• tº tº º 3o 1' 35 | 2 || 14 || 1 || 6’2OI | 3 || 9 || 1 || 435 t Pr. Cr. 48°45
y Coronae 1967 || 5 36 27 63 14| 288-88 || 5 || 10 || 1 || o'6 est. I 6oo || 4, 7 ? | P. W. 43°45
285'o6 20 || 48 || 4 || o'57 |est. 9 || 4 || 524 || 4, 7% - 52'o'7
tº wº • * • * | 284' 30 | Io 47 || 2 | o' 693 Io 24 || 2 || 86o || 4, 7 — 54°4o
# Scorpii A & B | 1998 || 5 56 8|10o 57| 16.74 |12 || 83 || 2 || 1:278 || 6 || 19 || 2 |320|| 6, 6 - 39' 61
* 1864 | 1.5 | 66 || 3 || 1:19.1 || 14 || 45 || 3 || 320 || 54, 5} | – || 4o'56
18'98 || 8 || 43 || 3 || 1: 198 || Io 5o || 2 || 353 || 53, 5} | – || 41'58
21:59 16 || 65 2. • * tº tº 38o || 6, 6 º- 42°46
23'55 || 4 || 17 || 2 || 1'o69 || 4 || 16 || 2 || 35ol 6, 6 | Pr. Cr. 43°40
• 3o 55 | 13 || 63 || 3 || 1 194 | 16 || 48 || 3 |406 || 5, 5+| P. W. 48'54
tº º 46’28 || 5 || 17 I * * I e & 353 t- 53’53
a Coromae 2032 |16 9 4| 55 45] 144’33 || 4 || 20 | 1 || 1:600 || 6 | 18 || 1 || 320 e - 39'53
14785 | 16 || 93 || 3 || 1:658 |18 || 67 || 3 ||353| 64, 7} | – |40-57
15o'32 || 13 56 || 3 || 1:657 | 12 || 47 || 2 || 3 || 3 || 6, 7 *- 4I'48
I 53'27 | 6 || 20 I * 420 | 6, 7 cº- 42'37
I 56' 5o | 6 || 49 || I * @ 420 | 6, 8 – |43:46
156'50 || 8 || 31 || 1 || 1774 || 8 || 33 || 1 || 185| 6, 8 Pr. Cr. 43°47
166°oo | Io 79 || 2 | 1.885 8| 6o || 2 || 510 || 6, 7 | P. W. 47'44
168-63 15||11o || 3 || 1995 || 14|95 || 3 |458| 6, 6% | – || 48°53
17o Io || 3 || 27 | 1 || 2: o31 || 4 || 31 || 1 || 375 6, 6% | – || 49'45
173'81 || 5 || 31 || 1 || 2:265 6|| 46 || 1 || 467 || 6, 7 - 5 I'42
177-87 |zo || 5o || 4 || 2: 388 || 14 |124 || 3 || 447 || 6, 7 — 53°63
tº - 178°46 | 15 99 || 3 || 2:257 |z2|148 || 3 || 53o | . . — 54' 56
Antares 16 20 13||116 6. 273° 17 | 26 |129 || 5 3'457 22 | 84 || 4 || 35o || 1%, 7% - 48°oz
x Ophiuchi 2055 |16 23 21 87 41| 358-30 || 17 || 76 || 3 I'o'72 6| 27 | 1 || 413 || 4, 6% - 4O' 54.
359'41 20 | 87 || 4 | I 138 || Io 45 || 2 |4ool 4, 6 – || 4 I'54
359'40 | 11 || 52 || 3 | I Io9 || 8 || 27 || 2 || 420 || 4, 6 wº- 42'58
o°30 || 6 || 3o || 1 || 1 ‘og 5 6|| 3o || 1 || 35o || 4, 6 | Pr. Cr. 43°41
I'60 | 1 || || 48 2 - - 420 || 4, 6 || P. W. 43'47
8'85 Io 61 || 2 || 1:244 Io || 6 || || 2 || 435 || 4, 6 || Sph. Cr. 48°47
9°o 5 ||25 || 52 || 5 || 1:272 |28||115 5 || 425 || 4, 6 | P. W. 48' 57
8'78 Io | 68 || 2 || 1:226 || 8 || 34 || 2 || 375 4, 6 - 49'46
I4'oo 20 || 3 || || 4 || 1 31 I |26|144 || 4 || 54c 4, 6 - 54." I4.
Micrometrical Measurements of Double Stars.
297

Q
Designation. Bégl §º ºpposition|}|#|# Distance|#|#|#|É | # § #;
£32. 1850. 1850. § # # 5 || 35 # ; ă, 5 gº
to c .3 # B. | 3 3 | }
l-l O O > >
h m 8 O y O’ A/ .
* Herculis 2084 |16 35 38 58 7 || 161 ‘95 || 23 || 16 || 4 || I*225 || 9 || 20 || 3 || 485 3, 8 P.W. 3976
tº º 15o'67 ||38||193 || 8 || 1:23.0 | 18 66 || 3 || 516 || 3, 7 * 4o'66
I42'97 || 26 |157 || 4 || I*239 |2O | 92 || 3 || 345 3, 7% — 41'65
o . . . . . I'o69 || 4 || 8 || 1 |420 3, 8 – 42°39
e I38°47 || 18 || 74 || 3 | . . 420 | 3, 7} — 42'58
. . . 129'89 || 14 | 69 || 3 || 1:298 |12 || 7o || 2 || 35o 3, 7 | Pr. Cr. 43-64
II.2°17 ||25 |169 5 tº ºn * * 336|| 3, 7 P.W. 46.89
Io?’97 || 5 || 36 || 1 || I'626 Io 88 || 1 || 38o 3, 6 * 47-53
Io2°o 5 |32 |195 || 6 || I'564 |34 |216 || 3 |479 || 3, 7 — | 48°61
gº º Io2'37 || 15 |Io9 || 3 || I'509 || 16 || 91 || 3 |435 | 3, 7 || Sph. Cr. 48°61
99°23 || 5 || 33 I I I’709 || 4 || 29 | I | Soo 3, 7 P.W. 49'48
86-90 || 15 87 || 3 || 1:593 || Io 52 || 2 |467| 3, 7 tºmº 5 I'8o
gº 8o'o8 ||37 |252 || 7 || I'664 ||38|2I4 || 7 || 524 – 53°4o
e 74°90 || 5 || 27 | 1 || I’533 || 6 || 33 || 1 |404 Sph. Cr. 54-40
e tº tº º 75'67 |24 |I65 || 5 || I'558 || 24 |146 || 5 | 666 tº ſº. P.W. 54' 50
| Herculis 167 B| 2107 |1645 54|61 5 * … tº º I'268 || 4 || 8 || 1 || 320 7, 8 -: 40°76
ºn tº .. ſe 162'o6 |18 || 55 || 4 345 7%, 8% * 4o'95
tº e 176'36 || 8 || 44 || 2 || 1'155 | Io 4o || 2 || 484 || 7'o, 8'5 | – || 52.85
tº e 175’7o || 3 | 16 || 1 || o'934 || 4 || 12 || 1 |404 Sph. Cr. 54°4o |
20 Draconis || 21 18 16 55 41| 2444 || 242-93 || 3 || 12 | 1 * 7, 7 P. W. 4077
tº º tº º * 241° 58 || 19 || 62 || 3 || O'61 I | 1.4 || 27 || 3 |446 || 7-4, 7-6 tºº 54°81
Herculis 2 Io B | 2120 |16 58 49| 61 42 || 347'ol | 16 || 52 || 3 || 2:982 || 14 || 42 || 2 |320|| 7, 10} tº-º-º: 4o'59
de gº 342°37 || 3 || II | I | 2'748 || 4 || 16 || 1 || 3oo 8, Fo wº-º 42" 53
338-41 || 13 || 78 || 3 || 3°o est. 3oo 7#, Io | – || 43’54
e 322:72 || 8 || 48 || 2 || 2:310 || 8 || 31 || 2 |375 | 73, 9; — 48' 55
* Draconis || 2130 |17 2. 14' 35 20 | 1872 || 8 || 41 || 2 e Jº 37o 6, 6 tº-º 4o°62
3’og I | 6 || 45 || 1 |420 E--> 4o'65
ſº 13°o2 || 5 || 31 || 1 || 3°o88 || 6 || 42 || 1 || 375 5+, 5 * 48° 52
tº e e * * 8°o7 || 3 || 23 I || 2:879 || 4 || 27 | 1 || 5oo tº- 51*7o
36 Ophiuchi 17 6 8|I 1623 || 2 19:26 || 14 57 || 3 || 4-784 || 8 || 35 || 2 ||223 54, 5} + #º 4. I'59
a. Herculis 2I4o |17 7 49| 75 26 I 18°45 | I 5 |IoI | 3 || 4°647 |12 || 71 || 3 || 417 || 33, 7 *sº 48° 52
& Herculis 2161 |17 18 31|| 52 43 || 308'98 |18 |139 || 4 || 3:781 |24 |157 || 4 || 368 || 33, 5 *º 48'83
B.A.C. 59 Io 2.173 |17 22 41| 9o 56 | 167°43 || 7 ||34 || 2 | o'714 || 4 || 8 || 1 |48o 7}, 7} *E* 41-64
e 163-32 || 8 || 41 || 3 || o'75 |est. ... | 1 |420 sº-ºº: 42'67
I61°23 || 31||128 || 6 || o'9 |est. ... | 5 || 386 || 7, 7 - || 43’54.
tº º tº º I59'45 || 2 || 8 || 1 | I Iob | 2 || 6 || 1 |435 | 7, 7 || Sph. Cr. 48.45
53 Ophiuchi 17 27 3o 8o 18 || 191'47 || 11 | 84 || 3 || 41'518 16 104 || 3 || 334 54, 8 P.W. 48° 53
Anonyma 22.54 || 7 52 4| 77 33 265°30 || II 52 || 2 || 3’o est. . . . 2 | 190 | 84, 9 tº-e 43°49
r Ophiuchi 2262 |17 54 55||98 Io 221'54 ||25 |103 || 4 || o'88o | 6 | 18 || 1 |53o 5}, 6% &== 4o 68
tº º 225'79 |33 |129 || 5 || o'790 || 6 || 26 || 1 |463 6, 7 º-s, 41-66
ROYAL ASTRON. SOC. VoI. XXXV.
298 Rev. W. R. DAWEs, Catalogue of

§§ - à +3 l tº # +S w; § § § # +
Designation. |3 # #. Nº. Position. # # Distance. # # # & # § 3. §
3% #| = |z #| = |z| 3 || 5 || 3 | #3
S. O O > >. > >
h m 8 || o / O //
ºr Ophiuchi 2262 |17 54 55, 98 to 226'90 24 || I e 42O • e P.W. 42-64
(continued) tº º 228'96 || 1 || || 38 || 2 || o'95 |est. 2 || 3ool 6, 6% * 43°61
232’75 || 5 || 29 || 1 || 1 or I | 6 || 19 || 1 || 375 5, 6 sºmº 48°66
tº º tº gº tº e e - 238°o 5 || 5 || 19 || 1 || I'223 || 6 || 14 || 1 |296 || 6’o, 6-2 — 54'67
95 Herculis 2264 |17 55 8 68 24 || 261'20 || 3 || 21 || 1 || 6’294 || 4 || 29 || 1 |435 | 5, 5+| Sph. Cr. 48°45
tº º • - tº tº - 26o’69 || 7 || 46 || 2 || 6′142 || 8 || 52 || 2 || 364 || 5, 5+| P. W. 5o'98
7o Ophiuchi 2272 |17 57 52|87 27 | 125'88 12 || 87 || 2 || 6′552 || 8 || 52 || 2 || 510 || 5, 7 * 39'65
- {e tº 124'88 |z2||130 || 4 || 6’ 628 26|135 || 4 || 485 || 5, 74 º 4o'59
e 123:42 | 18|103 || 4 || 6-635 |zo |121 || 3 |278||4}, 6; — 41'68
123°36 || 12 76 || 2 || 6'724 Io 52 || 2 || 360 || 43, 7 ººm- 42'53
I22°o2 || 3 || 2 I | I * , • * I e s 42O || 5, tºmmºn 43°47
e 118-83 || 15||109 || 3 || 6'804 || 16|109 || 3 ||350 || 44, 7 — 48° 12
II4'66 |29 |195 || 7 tº º • * 378 |4}, 6% * 53'6o
º e - 6'489 |24|156 || 5 || 323 — 53°68
tº º © tº ... l II 3’71 | 18||112 || 4 || 6′339 || 14 || 77 || 3 |424 | .. — 54."73
73 Ophiuchi 2281 |18 2 7|86 2 || 257'24 || 14 || 63 || 2 || I'55o I4 63 || 2 || 35o || 6, 8 || Pr. Cr. 43-62
e e e - e 255' 18 || 6 || 42 || 2 | 1.386 Io 58 || 2 || 348 || 6, 7} | P. W. 47.43
Anonyma [346]|18 8 55||70 16 || 327-27 | Io | 66 || 2 || 5'723 Io 58 || 2 || 327 | 84, 83 *mº 51-76
Anonyma 2309 |18 14 iſ 64 32 tº @ 3°736 || 6 || 13 || 1 || 185| 84, 9 * 41° 58
tº º • *. 25o'32 | 16 55 || 4 e i < * 244 || 83, 9} | – || 43'o?
21 Sagittarii A.C. Io 18 16 25||11o 37 || 292-67 | Io|| 4o || 2 || 2:446 || 8 || 23 || 2 ||251 || 5, 84 tºmº 53°7o
Bºº A.C. 1118 17 11| 91 39 || 178°Io Io 3o 2 o'425 |est.| 6 || 2 |490 || 7'o, 7-2 ºmmºn 54*7o
P. xvi.II. 132 [359]|18 29 18|66 31 || 176'92 || Io | 66 || 2 || o'729 | 16 || 65 || 2 |375 74, 7} * 48° 56
tº e tº e 178°55 || 8 || 4o || 2 || o'604 || 7 || 14 || 2 || 426 || 6-7, 7 o * 54." I6
Anonyma 2384 18 38 35| 23 2 || 312'82 I2 37 || 3 || o'7 =E |est. 3|320 | 73, 8% * 4I'O2
tº G tº º 332°88 || 3 || 3 || 1 || o'35 |est. I 5oo • * tºmº 54'83
6, 4 Lyrae 2382 |18 39 22 50 29 || 21 '95 || 17|Io3 || 5 || 3'255 24|135 | 5 || 320 || 6, 7} * 4. I'38
21°72 || 5 || 47 || 1 || 3' 169 || Io 79 || 1 || 64o || 6, 7 sms 46'95
2 I'4o | I5 || 12 || 3 || 3"I49 Io 65 || 3 || 375 || 5}, 7 — 48° 59
20-48 || Io 81 || 2 || 3:205 || 8 || 59 || 2 |467 || 6, 7 ºmmº 53°7 I
I9'60 | 18 ||14o || 4 || 3-125 | 20 |152 || 4 || 5oo * 54*7 I
tº e tº tº e 1958 Io 76 || 2 || 3°o31 || Io 71 || 2 || 203 || 5:2, 7'o | Sph, Cr. 54'84
tº 5 Lyrae 2383 |18 39 24 5o 33 152'32 I7 | 82 || 4 || 2°628 || 14 || 67 || 4 || 320 || 6, 6 + | P. W. 41 °21
I49'98 || 5 || 41 || 1 || 2:441 || 4 || 22 || 1 || 64o 6, 6% *= 46'95
e ‘º . . . 2'444 || 6 || 30 | 1 |475 e º Sph. Cr. 47-64
º tº Q 148'93 || 8 || 55 || 2 || 2'592 | Io 87 || 2 || 375 53, 5% + P. W. 48'54
• * tº º 147°46 | Io 79 || 2 || 2'456 | Io | 71 || 2 |467 || 6, 6-- tº-mº 53°7 I
e e 146-22 | 18 |IAI | 4 || 2:427 | 20 |I56 || 4 || 5oo tº e sºme $472
* - • * 145'93 || Io 63 || 2 || 2:477 |12 || 69 || 2 |203 |5'5, 5-6 || Sph. Cr. 54.84
& Lyrae ... 18 39 36 52 33 || 149'48 || 13 | 94 || 3 || 43'920 I4 || 83 || 3 ||263 |4}, 6 P.W. 48° 56
Micrometrical Measurements of Double Stars. 299



2% # +5 # +s § § ; º +
Designation. # #. Nº. Position. i # # Distance. # § # É # # i §
&c. # B |z # | P: |z| 3 cº .9 § -
t—l O O § = F | <
h m 8 o / O A/
g Lyrae A & B | . . [18 44 33 56 49 || 14970 || 8 || 63 || 2 || 45°927 | Io 6o || 2 || 313 || 33, 7} | P.W. 48-59
Anonyma 24.70 |19 3 17| 55 29 || 271°37 || Io 65 || 2 || 13°295 || 8 || 37 || 2 || 313| 7, 8% * 48° 53
Anonyma. 2491 |19 Io 12| 61 59 || 2 II* 59 || 1 1 || 34 || 3 || 1:233 |18 || 44 || 3 || 320 || 9, Io; — || 41'23
Anonyma. [378] 19 31 30 49 20 287'o'7 || 5 || 32 || 1 || 1:311 || 4 || Io || 1 |435 | 73, 9; Sph. Cr. 48°68
tº º ſº tº § ºn tº ſº 287'45 || 8 || 43 || 2 || 1:452 || 6 || 22 || 2 || 364 || 73, 9} | P.W. 51-65
x Aquilae | [38o] |19 35 31||78 31 || 77°og | 15 44 || 3 || o'525 |est. 6 || 3 |417| 6, 63 || – || 48-59
- 72°8o || 3 || 5 || 1 || o'463 || 2 || 2 || 1 |434|| 6}, 7 || Sph, Cr. 48°70
& © tº º gº tº 74'91 || 8 || 24 || 2 || o'475 est. 4 || 2 || 529 || 6, 6} | P.W. 53'71
Anonyma | L383] |19 37 49 49 39 || 23°67 || 8 || 48 || 2 || o'848 || 8 || 3o || 2 || 421 || 7-4, 8° 5 || – || 53°75
P. XIX. 263 |[384] |19 38 26 52 3 || 19743 | 10 || 52 || 2 | o'908 || Io 35 || 2 || 375 || 74, 8 — 48°60
tº tº tº tº ... I 197°26 || 8 || 49 || 2 || o'990 || 8 || 25 || 2 |421 || 7%, 7% | – || 53°73
2 Cygni 2579 |19 4o 17 45 I4 || 27°42 || 8 || 3 2 || I'5 |est.| 2 | I 320|| 2%, 8% *g 39.66
25° 19 || 7 || 25 2. 37o 3, 9 — 4o'67
23°75 | 16 || 76 || 4 lº 416 3, 9 — 41.89
& º & ſº g = 1 & # I'667 || Io 58 I 420 || 3, 9 tº- 41 '96
© e tº ſº 16.70 || 14| 71 || 3 | .. tº gº ſº tº 413 l 3, 8% – 47°39
tº º tº e © tº g tº 14:53 | 15 85 || 3 || 1:767 18 86 || 3 |417 || 3, 8 tºº 48°75
tº º tº º 11'56 | Io 57 || 2 || I’652 | Io || 51 || 2 || 546 || 3, 8 # =º 5 I'5 I
• e tº º Io'78 || 9 || 44 || 2 || I'683 || 14 6o || 2 ||375 tº ſº ſº- 52*74.
7'33 15 |Iob | 3 || 1:768 || 14 58 || 3 |467 || 3, 8 — 53.73
tº & © tº tº º tº gº 4:30 || 5 || 27 | 1 || I'688 || 4 || 15 || 1 || 630 º e tºmº 54°64
3. Sagittae 2585 |19 42 IS 71 14 we & • . . . . . • * 8'902 || 4 || 13 | I | 3oo || 5, Io $º 4I 57
tº wº tº Q e e G 312'32 || 9 || 52 | 3 tº º . . . . . . . . . 325 || 5}, 9} - 44'.9 I
Anonyma | [387] 19 43 9| 55 4 || 8973 || 13 || 51 || 3 || o'53 |est. 6 || 3 |402 || 7-9, 8' I | – || 53°75
Anonyma [388] |19 46 4' 64 34 tº Q 3'875 || 8 || 43 || 2 || 335 & º º- 52'26
e & tº e tº a tº ſº 139' 67 || 13 81 3 * * . . . . . . . . . 290 || 7°7, 7-8 * 52'64
16 Vulpeculae [395] |19 55 4o 65 29 || 8o-66 || 6 || 24 || 2 || o'57 |est. 5 || 2 |427 || 6’2, 6–2 || – 52'60
P. xx. 26 2644; 20 4 56|89 35 tº • e I e º I e a 3'368 || 1 o 57 || 2 || 360 || 7, 7} {--> 41°81
* * * @ tº º tº tº 2 Io"24 | 16 || 7o 4 tº º ! . . 335 | 7, 7% tºmº 42°4. I
Anonyma [399] 20 5 Iol 53 24, 279-67 11 | 66 || 2 || 4°612 || Io 46 || 2 || 355 || 7-8, 9'5 *- 54'o6
P. xx. 177 = D I | [407] |zo 24, 1|79 I 5 || 21 I*39 54 |I56 || 9 || o'65 est. . . . . . .467 || 9, 9} tºº 41 '56
211-62 | Io 22 || 2 | o'65 |est. . . . . . 35ol 83, 9 || Pr. Cr. 43°7o
gº ºn & © tº º 21 o'o6 22 | 72 || 4 || o'56 |est. 8 || 4 || 411 || 8, 8% | P. W. 5o'96
P. xx. 177, 178 2690 |zo 24, 3| 79 14 || 256'46 94| 94 || 4 || 14' 563 || 14 || 76 || 4 || 34o 7%, 8% *=se 4 I*37
Vulpeculae 94 B | 2695 |20 25 33 64 42 || 75' 60 | 10 || 6o || 2 | I too 1 |12 || 74 || 2 |48o 6-8, 8:3 º-ºº: 54. 74
Anonyma. 2698 |zo 27 26|62 24 || 303'59 || 9 || 33 || 3 || 4’332 || 8 || 3o || 2 || 313| 8, 8% * 41-63
303' 67 || 6 || 31 || 1 || 4' 561 || 6 || 34 || 1 || 185| 8, 9 || Pr. Cr. 43°62
* a • 3o4'81 || 7 || 3o | 1 || 4’396 || 6 || 26 || 1 || 296 • . P.W. 54.70.
Anonyma 2701 |20 29 5ol 78 28 220'46 || 9 || 35 | 2 || 2°51o || 8 || 29 || 2 || 360 || 8, 9 — |40°2 I
Anonyma 27.08 |20 33 o 51 53 || 346'87 Io 79 || 2 || 12°913 |12 || 85 || 2 |450 || 8, 10 tº- wº
3OO Rev. W. R. DAWEs, Catalogue of



- g; # +s .: § +5 I -: § § § #
Designation. ### #. * Position. # # Distance. # # # : É # - ää
%c #| B |z #| B |z| 3 § .9 ãº
1–1 O O # | = > || >
h m s! o z o • A/ –
Amonyma 2708 |zo 33 o 51 53 || 345'93 || 11 69 || 3 || 13'161 | 12 || 64 || 3 || 353 || 7, Io P.W. 40.67
(continued) - - - e
... 345°64 || 8 || 4 || || 2 || 13°463 || 8 || 43 || 2 || 3 Iol 7, 9 — 41'63
342'20 | Io 37 || 2 || 13-694 | Io | 37 || 2 |350 || 7, 9 || Pr. Cr. 43'86
tº e e ‘º e - 34o 52 || 3 || 23 I 16°oo8 || 6 || 41 || 1 || 353 tº e P. W. 53.82
49 Cygni 2716 |zo 34 59 58 13 2°819 |12 || 45 || 2 || 320 || 6, 9 — 41°75
49°47 | I 7 | 73 || 4 | . . 315|| 6}, 9} – 42"o 5
51' 17 | Io 24 || 2 || 2:858 Io 24 || 2 |350 || 63, Io | Pr. Cr. 43-86
• e e e - 49' 19 || 10 || 61 || 2 || 2:794 | Io 58 || 2 || 337 || 6, 8% P. W. 50:41
Delphini 43 B | 272.3 |20 37 46||78 14 87-78 || 6 || 28 || 2 || 1:479 || 4 || Io || 1 || 364 tº º tº- 53°75
Anonyma 2725 |zo 39 16|74 38|| 355'77 | 15| 64 || 4 || 4-656 || 6 | 18 || 2 |281 || 7%, 8% | – || 41' 16
tº e tº e 356'86 || 13 |Ioo || 3 || 4'745 | 12 || 93 || 3 || 315|| 7-6, 8°2 | – || 54'32
x Cygni |[413] |zo 41 34 54 3 || 104'49 |30|124 || 6 || o'65o | 16 || 43 || 6 || 605 || 5%, 6% | – || 53°70
4 Aquarii 2729 |zo 43 28 96 11 || 62’ 17 | 6 || 28 2 e - 460 & - 39'68
65'53 || 5 | 16 || 2 || o'6 |est. 1 : 51 o 6, 7% — 4o'72
72°75 || 5 || 12 || I 42O e tº - 4I '8o
81°73 || 2 || 3 || I 350 || 63, 7 | Pr. Cr. 43.76
95'90 || 3 || 3 || 1 || o'5 |est. I. | 1 || 353 || 6, 6% P. W. 53°7o
- - tº e tº e Io I'7o || 3 || 4 || 1 || O'3 |est. 2|63o e - 54."75
Anonyma [415.j |zo 44 17| 6o 8 || 238°77 || 8 || 44 3'372 | 8 || 29 || 2 || 306 || 8, 9% *- 5o'81
s Equulei.A & B | 2737 |20 54 35 86 17 | 287-71 24 |Ioz ‘e e tº tº 54ol 5, 5% * 4o'97
A e tº º o'598 || 4 || 8 || 1 || 6ool 4%, 5 *- 4 I'85
287°oo || 3 | 18 I [ . . e Q 435 | 5, 6 — 47.63
© tº o'738 || 6 | 18 || 1 || 475 Sph. Cr. 47.63
287-20 | Io 65 || 2 || o'872 || 8 || 20 || 2 || 375 5, 6 P.W. 48.67
* e > 28526 | 15 96 || 3 | o'970 | 16 || 55 || 3 || 391 || 5, 6 — 53.83
*A*se 76'95 | 11 | 73 || 3 || 10.753 || 8 || 54 || 2 |407| 5}, 9} | – |41.16
76-73 || 3 || 15 || 1 || 11.249 || 3 || 15 || 1 | 185| 53, 9 || Pr. Cr. 43.79
* * 76-64 || 8 || 54 || 2 || 1 o'763 || 8 || 35 | 2 || 364 || 43, 7} | P.W. 51 '96
P. xx. 429 274. I |2O 53 42] 4 O 7 2'o66 || 4 || 18 || 1 || 320 || 7, 8 * 4 I'8o
a tº e tº tº - 32°25 | I5 97 || 3 321 || 64, 8 - 46°oo
Cephei 83 B | 2751 |20 58 1|33 56 || 347-28 || 10 | 72 2 - - 337 || 64, 7 sm- 5o'62
º tº tº e I'809 || 4 || 24 || 1 || 353 || 6'5, 7°o tº- 53-88
61 Cygni 2758 |z I o 11 51 59 16'515 26 || 58 || 5 || 326|| 5}, 6% * 41 ‘o&
97.75 |33 |206 || 7 tº º tº tº 2994 o *- 41 62
& e 98’90 || 3 || 26 || 1 || 16'78o || 3 || 26 || 1 || 185| 6, 6% | Pr. Cr. 43'76
1oo’97 || 8 || 68 || 2 || 17'o'72 | 12 |Ioo || 2 || 322 || 5%, 64 P. W. 46'87
e IoI'95 || Io 71 || 2 || 17°ooo 16 |122 || 2 |287| 5}, 6% g- 48° 30
tº e * - 17°o44 || 4 || 19 || 1 || 268 - 5o'88
Io9'87 | 8 || 5o 2 tº º e - I e e 2, O2, sº- 5 I 19
IoA'39 || 6 || 48 || 2 || 17-248 || 8 || 48 || 2 || 4:37 - 53'26
Micrometrical Measurements of Double Stars.
3o I.



gº' - #| | | | | # § | 3 || 3 || 3
P . - - º .v. .2 | +3 | tº rº-3 $3 O
Designation. #4 #. Nº. Position. i #. # Distance. # § # ; - # # #
|& C # P. Z. #| = |z| 3 || 3 || 3 ||3:
t—l O O > > > >
- h m 8 o z O t f/ *- - ... " -
Anonyma 2760 |21 o 39 56 28 223.90 || 3 || 22 || 1 || 12° 152 || 4 || 31 || 1 || 3ool 7, 8 | P.W. 41-67
... • * , ‘. . . . 223'42 || 14 || 67 || 3 || II '987 || 14 || 64 || 3 || 35o || 74, 8% Pr. Cr. 43'82
Anonyma 2767 |21 3 38 7.0 39 || 31'51 || 14 7o || 4 || 2'687 20 77 || 4 || 3ool 7-8, 8.2 P.W. 51.74
Anonyma [431]|21 5 51 49 21 | 1.17-23 Io 7o || 2 || 3:204 || 8 || 38 || 2 313|8'1, 8:3 — 51:21
II 7'94 Io 59 2 3.23. Io 51 || 2 || 319|8-6, 8:8 || Sph. Cr. 52°38
• s , tº º 118°72 || 4 || 12 || 1 || 3'434 || 4 || 24 || 1 || 145 - e. Pr. Cr. 53-89
P. xxi, so | [432]|21 8 34|4928||129.69 |10| 5 || 2 | roys |12 | 60 || 2 |4|iol 7-5, 8'o | P.W. 53.86.
Equulei 27 B | 2786 21 12 19|81 6 || 184'1 1 || 8 |32 || 2 || 2:304 || Io 32 || 2 ||478 || 7}, 8% *- 48° 56
Anonyma |[435] 21 13 Sol 8744 || 201:78 |16|45 || 4 || o'55 |est. 9 |4|46ol 77, 7.8 || – || 52:43
Anonyma |[437]|21 14 30|58 10 || 63-65 || 5 || 35 | 1 || 1:288 || 4 || 19 || 1 |435 | 6}, 7 |Sph. Cr. 48°68
... e º . . . - 60° 19 |13| 76 || 3 || 1:294 |12 || 47 || 3 |458 || 6'9, 7.1 | P.W. 53'50
Pegasi 20 B | 2799 |21 21 35||79 34 || 327°42 |43|235 || 9 || 1:264 30 || 17 | 7 |414|| 63, 64+| – || 4o'72
. . 32767 || 2 | 12 || 1 || 1:241 || 2 | 12 || 1 |350 | 7, 7+| Pr. Cr, 43°76
322.63 || 9 || 58 || 3 || 1:262 |12 || 54 || 3 ||343||7.5, 7-6 || P.W. 51’96.
32 I'74 || 6 || 20 | 1 || I'4oo | 6 || 47 || 1 || 275 Pr. Cr, 53'89
e e tº e © tº e - 320'31 ||25 |157 || 5 || I" 177 || 3o 187 || 5 || 484 e v. P.W. 54*74
Pegasi 29 B | 2804 |21 26 3| 69 57 | . . e - 2’938 | 16 || 81 || 3 |447 || 7, 8 — 4o'3o
317°85 | 16|Ioo 4 * * * 4 Iol 7, 7} - 4 I'44
319-67 || 4 || 1 || || 1 || 2'916 || 4 || 12 || 1 || 185| .. Pr. Cr, 43°72
e - e - 320-8o 21 |147 || 5 || 2'832 22 |136 || 5 || 383 || 7-8, 8.2 | P. W. 52°45
(, Cygni 2822 |21 37 26 61 56 || 1 I4°o4 || 13 57 || 4 || 5'541 || 14 || 55 || 3 || 3 II || 4, 5} | – || 41°23
tº º e & 114-99 || 8 || 53 || 2 || 5’297 || 8 || 51 || 2 || 268 || 4, 6 || Pr. Cr. 43°78
Anonyma. 2848 |21 5o 31|| 84 46 || 56°18 || 11 || 52 || 3 || Io'631 || Io 42 || 3 ||38o || 73, 8} | P.W. 41°38
33 Pegasi A & B 290o 22 16 27. 69 55 || 179'1 1 || 8 || 38 || 2 || 2.829 || 6 || 3 || || 2 || 360 || 7, Io * 4o’ I 5
180° 16 || 8 || 35 | 2 - Q º tº 308 || 6%, 8% tº- 51° 58
e O tº º e tº 2'404 || 6 || 26 || 1 || 357 || 6’ 5, 9°o — 54°78 |
33 Pegasi A & C tº e 34o'67 || 6 || 4o || 2 || 57°887 || 4 || 22 || 2 || 360 || 7, 8 — , 4o’ I 5
& Aquarii 2.909 |22 21 6| 9o 47 3:670 |42 |284 || 9 || 394|4}, 4}+ *- 40°48
34.9°24 || 74 4.54 | I 7 | . . tº a 385 || 43, 4}+| – || 4 I 19
tº e 348-29 |42 |17o | 8 || 3’5or 43 |165 || 9 |222 || 43, 4} | Pr. Cr. 43’55
347°53 | 16|124 || 4 || 3-482 |22 |181 || 3 || 413 || 4, 4} | P.W. 46'95
o 346'83 || 5 | 20 || 1 || 3'383 || 4 || 17 | 1 || 3 Io 43, 4} | Sph. Cr. 47°93
346'42 || 6 || 3 I | 1 || 3'274 || Io 45 || 1 || 3oo º P. W. 48-os
345' 18 |34 |241 || 8 || 3'435 | 40 |222 || 8 || 486 || 4, 4} | – || 53°48
. 345' 18 || 5 || 35 | 1 || 3'320 || 4 || 29 || 1 |416 | . . . Sph. Cr. 53.95
343'27 | 5 || 36 || 1 || 3°313 || 6 || 37 || 1 || 203 || 43, 4} + | – || 54-84
e - ... I 343'96 || 5 || 28 || 1 || 3'334 || 6 || 32 || 1 || 390 .. P.W. 54'99
37 Pegasi 29 12 |22 22 23|86 20 © tº e e 1'22. 1 || 4 || 9 || 1 || 6ool 6, 7 tº- 39'69
118 16 || 8 || 49 || 3 • * 48o 64, 7% tº- 4I 'o'7
e 116- 16 || 8 | 20 || 2 || 1 Ioo || 8 || 20 || 2 || 35ol 63, 7} | Pr. Cr. 43'87
|
so, - Rev. W. R. DAWEs, Catalogue.

Designation. ; É 3| R.A. N.P.D. Position. # #. # Distancel; º # & É # fi §
##2, 1850. 1850. ; # 35 ; # 3 | ".. É, s a &
%c #| B |z. # B |z| || 3: cº; .3 § 2.
l—l O O >| | E = | s
37 Pegasi h m B o / 3. ! - • A Q. g
(ºntinued) 29** * * *3 86 20 || 118°53 20 |125 || 4 o'909 |22 |Io8 || 4 || 589 || 6’4, 8.2 P. W. 54'54
Anonyma. [478] 22 37 19 51 19 || 28o°13 | I 5 96 || 3 || 2'936 | 16|IoI || 3 || 335 | 6’ 5, 9°o sº 51*49
Anonyma. 494 |22 13 18: 68 52 || 82°12 II | 83 || 3 || 3°273 || 14 | 85 || 3 || 329 || 8°o, 8'5 sº 5o°og
Anonyma 3oo6 |23 13 58||55 23 176'98 || 6 || 18 || 1 || 5-223 || 6 | 18 || 1 || 185| 9, 1o | Pr. Cr. 43.78
176'37 || 14 || 61 4 . . . . . . . . . . . . 228 || 83, 9} | P. W. 45-51
tº º tº e . . . . . . . . . . . . 4'896 || Io 30 || 2 |271 § tº tº- 48°72
P.xxIII.1oo-D2|[496] 23 22 58] 32 17 | 222*28 22 |IoG | 3 || 1:459 16 || 69 || 2 |320|| 8, 10} i-sº 41°82
• • * * tº tº ... 225°oo || 8 || 44 || 2 || I*627 || 4 || 15 I || 313 || 7%, 9 *sº 47°91
Anonyma [503] 23 34, 27| 7o 31 || 130°o7 ||25 || 53 || 5 || I*643 || 26 |116 || 5 || 386|| 7-8, 8°3 tºº 53’ II
o, Cassiopeº 3o49 |23 51 26 35 5 || 324'58 || 8 || 57 || 2 || 3'o63 || 10 || 63 || 2 || 398 || 5, 7} | . — 45-37
Anonyma 3061 |23 58 3| 73 o 145'98 || 27 |151 || 7 || 7-610 |32 |158 || 6 || 290 || 8, 8+| – || 4o 38
- tº º e ‘º 145'68 || 9 || 24 || 2 || 7'733 || 8 || 29 || 2 |267 || 8, 8 || Pr. Cr. 43'90
tº ºr tº º tº tº 146.70 || 13 || 71 || 3 || 7' 573 |12 || 56 || 3 || 368 || 8, 84 P. W. 5o'86
. Anonyma 3062 |23 58 26, 32 24 || 186'96 || 13 || 36 || 3 || o'8 est. . . | 2 || 353 || 63, 7% gº 4o°78
tº º 193°43 || 8 || 47 || 2 || o'954 Io 26 || 2 |42 o 7%, 8 tº- 41'86
2 Io'oo || 4 || 9 || 1 || O'937 || 4 || 9 || I | 35o || 7, 8 || Pr. Cr. 43'8o
tº e 228°85 || 3 || 23 I | I'í 59 || 4 || 25 | I | 375 || 7, 8 P. W. 48.87
© º 235'24. I | 4 || I 375 e g & Cº. 5o’93
. . . 244’30 || 13 | 63 || 3 | . . . . . . . . . . . . .354|| 7°o, 7' 5 || – || 54'19
• * © e tº º tº dº e º tº e I’285 | 8 || 27 || 2 || 355 * † *-º 54'32
NOTE S.
B
W C B
A BBREVIATIONS
EMPLOYED IN THE NOTES ON THE DOUBLE STARS.
denotes
22
99
BESSEL.
W. C. BOND.
G. P. BOND.
CHALLIS.
DAWEs.
DEMBOWSKI.
ENCKE.
FLETCHER.
GALLE.
HERSCHEL I.
HERSCHEL II.
HIND.
JAcoB.
KAISER.
KNOTT.
MÄDLER.
MACLEAR.
MI denotes
P. W. M.
Pr. Cr. M.
Sph. Cr.M.
92
22
22
92
55
55
92
92
92
25
22
25
MILLER.
MORTON.
OTTO STRUVE.
ROMBERG.
SOUTH.
SECCHI.
SMYTH.
STRUVE.
Position angle.
Distance.
Parallel Wire Micrometer.
Prismatic Crystal Micrometer
Spherical Crystal Micrometer
night or nights.
refl.
refr.
reflector.
refractor.
*.
NOTES ON THE DOUBLE STARS.
No. 629 = 2 19.
It seems probable that the distance may have increased ; but there is no sufficient evidence
of any variation in the angle, the observations of which are too conflicting. The star does not
appear to have been much noticed, but we have the following for comparison :-
1830°48 P = 133°60 D = #980 X on 3 n. Mens. Micr. p. 27.
1836-97 I 33' Io 2'337 X on 4 m. Mens. Micr. Appendia. III. p. 302.
1845'22 I 35' 17 2'273 O X, communicated by letter.
1854'81 I 3 I '94 2:547 DA on 3 n, with 73-in. refr. by Alvan Clark and P.W. M.
1854-84 I 31 '30 2'503 DA on I n, with same telescope and Sph. Cr. M.
No. 635 = 2 23.
Both the angle of position and the distance of these stars have continued to decrease,
according to STRUVE's remarks in the Mens. Micr. pp. 171 and 281. He has there given the
following formula for the distance at any period subsequent to 1832-13, the epoch of his obser-
vations:—D = 13". 303 – O''. I of (t — 1832° 13). Comparing the observed with the calculated
distances we have for the epochs of observation—
Calc. Obs. C – O.
1840-84 14 397 14.602 – cºzos Obs. with Mr. Bishop's 7-in. refr. and P.W. M. on 1 m.
1843.93 12'oZ6 II '904 + or 172 Obs. on 1 m. with same telesc. and Pr. Cr. M.
1854'oo 11'oz9 Io977 -- o'osz Obs. on 1 m. with 63-in. refr. and P. W. M.
Considering that each of my results was obtained on one night only, the differences are not
large. The distance for 1840-84 was marked at the time as “very poor.”
For comparison with my results in the Catalogue we have the following by STRUVE :-
I 832. I 3 P = 36&48 D = 13:303 X on 6 n. Mens. Micr. p. 171.
1836-74 359'72 12:700 X on 3 n. Mens. Micr. p. 281.
1837.82 360-2 I 2.68o 2 on I n. Additamenta, p. 3.
ROYAL ASTRON. SOC. WOL. XXXV. R. R.
306 Rev. W. R. DAWEs, Catalogue of
No. 639 = 2, 25.
A comparison of my results with STRUVE's shows that a slight diminution in the distance
may have occurred in these stars, the angle remaining nearly stationary.
D = #673 2 on 3 n. Mens. Micr. p. 27.
I'535 DA on 1 m. with 63-in. refr. by Merz.
P = 19267
I 92°23
1831-82
1852'45
No. 642 = O > 12 = A Cassiopea.
Though the difference between my measures and those of Mr. OTTO STRUVE (who detected
this very close double star) is very considerable, I fear it must be attributed rather to error of
observation than to orbital motion. Mr. STRUVE has kindly favoured me with his observations
for comparison.
1844.81 P = 121:40 D = o;27 O > on 4 n. (D on 3), with 15-in. refr. by Merz(z —180°).
1845-73 I 22°29 o'325 M on 2 n. with 9-6-in, refr. by Fraunhofer at Dorpat.
1847'54 128'90 o'495 O > on 4 m. (Z – 180°).
185 I '99 I 22°53 o:288 M on 4 n.
1853-92 I 15'82 o:539 DA on 1 n. with 63-in. refr. by Merz, and Sph. Cr. M.
1854-81 I 16°ol o'569
DA on 1 m. with 73-in. refr. by Alvan Clark, and P. W. M.
No. 644 = 2 60 = H III. 3 = %, Cassiopea.
The increase of the angle and diminution of the distance pointed out by STRUVE are both
confirmed by subsequent observations, as appears from the following selection:—
1831°75 P = 88.72 D = 369 H on 1 m. with 5-in. refr. by Tulley.
1831 '92 88'2 I 9'94 SM Mean of three years’ obs. weighted.
1832°o 5 87.60 978o X on 5 m.
1832-87 88-67 97.40 DA on 2 m. with 3.8-in. refr.
1835.26 9 I*23 9°52O 2 on 3 n.
1836-74 92' I 2 9:395 2 on 4 m.
1841-8o 95°75 9:335 DA on 1 m. with Mr. Bishop's 7-in, refr. by Dollond.
1848-69 Io I '8o 8, 18 O > on 4 m. with 15-in. refr. by Merz, at Pulkowa.
I85 I'45 Ioé-63 8-166 F on 7 n. with 44-in. refr. by Cooke.
1853'51 Io9' 17 7.978 J on 7 m. with 6'3-in. refr. by Lerebours.
1854°oo Io9'60 7.907 DA on 1 m. with 64-in. refr. by Merz.
I 854'91 I I I'85 7:844 DE on 7 n. with 54-in, dialytic refr. by Plössl.
Micrometrical Measurements of Double Stars. 307
No doubt can remain respecting the orbital nature of the movement, for the proper motions
in R.A. and N.P.D. applied to the larger star would have diminished the angle as well as the
distance, supposing the Smaller star to be at rest. e -
No. 646 = X 61 = 65 Piscium.
My observations do not indicate any change either in the position or distance of this double
star, as will be seen from the following epochs:—
1830'90 P = I 1765 D = 4.429 DA on 3 m. with 3.8-in, refr. by Dollond.
1839:76 118'50 - DA on I n, with Mr. Bishop's 7-in, refr.
1854'03 1 18:16 4’391 DA on 2 n. with 64-in. refr.
These compared with the results of STRUVE and SMYTH indicate complete fixity.
1832. I 3 P = 11397 D = 4450 X on 4 m. (Z — 180°).
1838. 17 II 5'5 4' 5 SM
No. 649 = X 73 = 36 Andromeda.
The angle of position of these stars has increased about 22° during the interval of twenty
years embraced by the observations in the present Catalogue and Appendix; the distance having
also pretty certainly increased to a small extent. The following series contains the principal
results since the discovery of this interesting binary star by STRUVE. The golden or orange-
Ayellow of both stars is noted by most observers:—
1830'73 P = 3oso, D = o'849 H on 2 m. with 5-in. refr.
1831'79 308.62 o'775 H on 4 n. (Dest. on 2).
1832° 14 307-8o o'847 2 on 3 n.
183592 3 I 5’7 I 1 SM
1836'90 32 o'47 o'937 2 on 3 n.
183977 318: 5 I “I SM
1839'79 317.82 I'og2 DA on 3 n. (D on 2), with Mr. Bishop's 7-in. refr.
1840'98 3 I 9°35 1'o60 DA on 5 n. (D on 3), with Mr. Bishop's 7-in. refr.
I 84I '59 3.24°75 1’ 192 M on 6 n. (D on 5). -
1841-87 32 I ‘24 1’ 102 DA on 3 n. with same telescope and P.W. M.
1842-77 325'83 I'o47 M on 2 n.
I 842-94 322°93 I'oo7 DA on 2 n. with same telescope and Pr. Cr. M.
1843' 12 322'9 I "O SM
1843-88 3.24°53 I'1 17 DA on 4 m. with same telescope and micrometer.
1843'99 32 I'4 I
DA on 2 n. with same telescope and P. W. M.
308
DAWES, Catalogue of
* Rev. W. R.
1846'93 P = 32837 D = 1420
1846.96
1846'99
1847'90
1847-92
1847-93
1850'91
1851°oo
1851'93
1852-83
1853.87
1853.87
1853-89
contribute to produce these discrepancies.
1853-90
1853.96
I 854'75
1854-91
3.29'oo
3.29'61
329-36
3.2997
332'O2
334°oo
336-38
335'8o
336-58
334°52
336'57
334°44.
338'06
335-88
34o Io
I ‘I 24
I'264
I'219
1227
1' 173
I ‘4oz
I I 16
I'3
I ‘28o
I'o78
I 2 I 8
1' 170
I '26 I
1-227
I'25o
DA on 5 n. (D on 2), with 63-in. refr. and P.W. M.
DA on 1 m. with same telescope and Sph. Cr. M.
M on 1 n. w -
M on 3 n.
DA on 2 n. with 63-in. refr. and P. W. M.
DA on I n, with 63-in. refr. and Sph. Cr. M.
DA on I n. with 63-in. refr. and P. W. M.
M on 3 n.
F on 5 n, with 44-in. refr.
SM
M on 3 n. -
DA on 2 n. with 63-in. refr. and P. W. M.
DA on 2 n. with 63-in. refr. and Pr. Cr. M.
DA on 2 n. with 63-in. refr. and Sph. Cr.M.
J on 3 n. (D on 2), with 6'3-in. refr. at Madras.
DA on I n, with A. C.’s 74-in, refr. and P.W. M.
Mo on 3 n. with 73-in. refr. at Lord Wrottesley's
Observatory.
No. 685 = 2 86 = H III. 73.
The comparison of my observations with those of H and STRUvE corroborates the sus-
pected diminution of angle in these stars, as appears by the following epochs:—
1783:08 P = 1838
1824'99
1830°41
1836-58
1841-61
1737
17 I'55
169:40
167-64
D = 1483
I 2 ° 22
12'o6
12' I I 5
12:51 I
H
2 on I n. (Mens. Micr. Appendix III. p. 282).
2 on 2 n.
2 on 3 n. -
DA on 4 n. (D on 3), with Mr. Bishop's 7-in. refr.
No. 689 = X 113 = 42 Ceti.
The large discrepancies in the measurements of the angle of position of these stars, even by
the same observer, render it still uncertain whether any real change has occurred. No doubt
the closeness of the stars, their moderate altitude in these latitudes, and their oblique position,
following comparison:—
The mean results by different observers afford the
Micrometrical Measurements of Double Stars. 309
1831-61 P=333.62 D=2445 2 on 4 n.
1836'91. 334’3 o 1' 177 X on 3 n. - -
1842.64 33 1:42 . I'ol 4 DA on 3 n. (D on 2), with Mr. Bishop's 7-in. refr. and P. W. M.
1843.86 335-64 1’ 185 DA on 2 n. with same and Pr. Cr. M.
1854' 5 I 338°47 1-164. DA on 3 n, with 74-in. refr. by Alvan Clark, and P. W. M.
No. 697 = X 117 = \l, Cassiopea.
A comparison of STRUVE's results with my own does not indicate any change in the position
B + C
or distance of the components of this triple star. For A and -- we have,
1831 o4 P = Io; io D = 33.9 X on 5 n.
183974 1 oz'75 • e DA on 1 m. with Mr. Bishop's 7-in. refr.
1854'07 I O4'90 3o'55o DA on 1 m. with 63-in. refr. by Merz.
And for BC
2
//
1831 to 4 P = 2;#32 D = 3'oro X (P on 4 n. D on 5).
1839'74 I 53°o9 tº gº DA on 1 n. with Mr. Bishop's 7-in. refr.
1854'oZ - 255°37 3.248 DA on 1 n. with 63-in. refr. by Merz.
No. 702 = x 138 = H N. 92.
Though the results of my observations of this star do not run very smoothly, there can be
no doubt of its binary character. Compared with STRUVE's we have,
183 o'23 P = 20°oo D = 1467 x on 3 m.
1841'54 24, 18 I'404 DA on 13 n. (D on 9), with Mr. Bishop's 7-in, refr.
1853.81 29:38 • • DA on 3 n. with 63-in. refr. by Merz.
I 854°og tº ºt 1.262 DA on 2 n. with same telescope.
No. 719 = 2 155.
My observations of these stars taken by themselves do not countenance the supposition of
change in the angle, though compared with STRUVE's results the difference, amounting to 4°,
is greater than might be expected for a distance of nearly 5". But it should be noticed that
the position is very oblique. * -
3IO t Rev. W. R. DAWEs, Catalogue of
1830-60 P = 33%z D = £600 2 on 4 n.
1842°45 tº gº 4,659 DA on 4 n. with Mr. Bishop's 7-in, refr.
1842.8o 328:88 * & DA on 6 m. with same.
1853-94 3.28°46 4:591 DA on 2 m. with 64-in. refr.
For comparison of my results with different kinds of micrometer we have,
//
1845'o6 P = 32889 D = ... With P. W. M. on 9 m.
1845-64 tº gº 4,653 With P. W. M. on 7 n.
1843-87 329'88 4,604. With Pr. Cr.M. on 1 m.
1853-92 3.29'O2 4,636 With Sph. Cr.M. on 1 n.
No. 730 = X 180 = y Arietis.
My observations do not indicate any change in these stars. There is however a very
remarkable and unusual difference between the distances obtained with the parallel-wire micro-
meter and with the double-image spherical crystal micrometer, as appears by the following
comparison;–in which however it should be noticed that on three out of the four nights on
which the P. W. M. was employed it was attached to the five-foot refractor. It would seem
that these measures are considerably too large, which is the more extraordinary as, the position
being nearly 180°, the stars almost exactly ran along the webs by the diurnal motion. And if
the difference of declination was thus measured instead of the actual distance the result would
be a trifle smaller instead of being too large. *
1835–88 P = 35398 D = 8'996 DA on 4 n. mean of all with P. W. M.
1847°93 358:20 8-621 DA on 2 n. with Sph. Cr.M.
The mean results of STRUVE's observations at Dorpat and Pulkowa are—
1830.84 P = 35998 D = #631 X at Dorpat, on 7 n.
1851.82 358'5 8:45 X at Pulkowa, on I n.
No. 733 = X 202 = 2 Piscium.
My observations of this object contained in the present Catalogue, compared with those I
made at Ormkirk, indicate a slow diminution of the angle.
1832-88 P = 332 is = #756 DA on 5 n. with 3.8-in. and P. W. M.
1846-92 33 o'o6 tº dº DA on 1 m. with 64-in, refr.
I 853'99 3.28° Io 3:420 DA on 2 n. with same telescope.
Micrometrical Measurements of Double Stars. 3 II
The latter determination of the distance is supported by the following measures with a
double-image micrometer:—
1842'95 P = 3 3&128 D = 3479 DA on 1 m. with Mr. Bishop's 7-in. refr. and Pr. Cr.M.
Perhaps a slight diminution of the distance may have actually occurred, being rendered pro-
bable by the following comparison of measures by other observers:–
1831. 16 P = 33.5%z D = 3,636 2 on 5 n.
1834'92 334’7 3-6 SM “Bedford Cycle.”
1851.75 329°43 3'404 F on 6 m.
1851.76 329°22 3'49 J on 2 n.
1852.68 3.28°44 3'48 J on 3 n.
1853.96 327.86 3°22 J on 3 n.
I854'44 327'99 3:612 DE
It, may be worthy of notice that the obliquity of the position demands special precautions
in procuring measures of the angle. -
No. 737 = O > 38 = y, Andromedae.
My measures of this interesting object indicate on the whole a decrease in the angle,
though the series does not run quite so smoothly as might be wished. It is remarkable that
in Mr. OTTO STRUVE's observations at Pulkowa, the north preceding star is always judged to
be smaller. In all my observations I have never felt the slightest doubt that the star in the
south following quadrant is the smaller by at least half a magnitude ; and with this, all
English observers, I believe, agree ; and so also does SECCHI. I have never suspected the
slightest variability of magnitude in either of them.
1842-72 P = 1266 D = &si > on 1 n. at Pulkowa (Z. — 180°)
1842-83 125-80. o'4 est. DA on I n. with Mr. Bishop's 7-in, refr.
1845’ I 5 116-92 o'39 M on 4 m. (Z — 180°)
1847-82 I I I ‘35 o:62 est. DA on 4 m. with 63-in. refr.
1851 19 1 1658 O'405 M on 4 n.
1852.78 I I I 3 I o:5 est. J on 2 n. with 6%-in. refr. by Lerebours.
1852.82 1 I 5' 39 O'474. M on 5 n.
1853'79 IoS-53 o' 55 est. DA on 4 m. with 63-in. refr.
1853-94 106-83 o°4 est. J on 4 m.
1854-75 I I 2 "O I o'608 DA on 1 m. with 73-in. refr. by Al, Clark.
My last measures, which were considered very trustworthy, the stars being almost sepa-
rated, render doubtful the continued decrease of angle, which would otherwise appear certain.
312 Rev. W. R. DAWEs, Catalogue of
Moreover, Mr. OTTO STRUVE, in his note on this star in his Catalogue Revu et Corrigé, 1850,
informs us that “the observations at Pulkowa made between 1842 and 1850 indicate no
perceptible change in the position of the close stars.” It may be worthy of remark that my
observations in 1854 were made on one night only. (See Appendix to the Catalogue and
Notes upon the observations in it.)
No. 748 = X 208 = 10 Arietis.
The observations of this star are not sufficiently accordant to determine whether any change
has occurred since it was discovered by STRUVE ; but, if any, it must be very small
No. 753 = X 218.
There is no evidence of change in this star, as appears by the following comparison:-
1824-92 P = 250°48 D = 4.956 S on 2 n.
1832°36 25 o'oo 4:782 2 on 4 n. .
184 I '95 tº gº 4'832 DA on 2 m. with Mr. Bishop's 7-in. refr.
1842°42 2.48° 58 DA on 3 m. with same.
1854°o7 248°35 4'907 DA on 1 m. with 63-in. refr.
No. 757 = S 221 = H III. 68.
My observations of this star scarcely countenance the diminution of angle, which was at
first suspected, but subsequently doubted, by STRUVE. We have the following epochs for
comparison:-
- O //
1782.69 P = I 45-70 D = 8'o8 H
1822'o6 I 5 o' I 5 8.64 > with the 5-foot telescope at Dorpat.
1824.87 - 148.82 8-952 S on 2 m. with 5-in, refr.
1831:36 I 45-67 8437 2 on 4 m.
1836'91 I 45°23 8:377 2 on 3 m.
1842-33 I 43’52 8’433 DA on 7 n. (D on 4) with Mr. Bishop's 7-in.
º refr. and P. W. M.
1843°41 I 43' I 4. 8’ I 53 DA on 2 m. with same and Pr. Cr. M.
I 854. So I44'o7 - 8’463 DA on 4 m. with 63-in. refr. and P. W. M.
As the position of the stars is very oblique, I am disposed to consider the differences in the
measured angles as arising from personal peculiarities in the observers. - -
Micrometrical Measurements of Double Stars. 3I 3
No. 770 = X 240.
My observations of this star, compared with each other and with STRUVE's in 1832,
indicate no change either in angle or distance.
No. 775 = X 262 = . Cassiopea (= Cassiop. 35 Hev.).
This triple star is H. I. 34 and III. 4. My observations, compared with each other and
with STRUVE's, indicate pretty decidedly a slow diminution of the angle in the close pair, while
the distance may possibly have slightly increased. This star is P II. 72 and B.A.C. 744; but
is not Fl. 55 Cassiopea as H supposed it to be.
1782'44 P = 29°so D = ".. H with 278, 3 diameter of S.
1829'66 276.68 1862 > on 5 n.
183 I 13 277°og 2' 198 DA on 5 n. (D on 3) with 3-8-in. refr.
1831-64 275'36 1884 M
1834.83 274°2 2 * I SM Cycle, No. 97.
1837'O4. 274’38 tº º DA on 1 n. with 3.8-in. refr.
184O'91 271-76 2'237 DA on 2 n. with Mr. Bishop's 7-in. refr.
1843'2O 269'o I'97 O > on 3 m. with 15-in. refr. by Merz.
1848°og 265'50 2.238 DA on 1 n. with 64-in. by Merz.
There is no evidence of variation either in the position or distance of the more distant star.
No. 780 = X 269 = H I, 21 = P II. 89.
There seems to be no certain evidence of change in this star, as appears by the following
comparison :-
1832-36 P = 34°49 D = 1903 2 on 3 n. -
1834. II 342' I 2' 3 SM Cycle, xcix. where it is named, “P II. 93,
Trianguli.”
1846. 39 344." Io 1:648 O > on 4 m. sent to me by letter.
1848-63 34. I'3O 1923 DA on 6 n. with 64-in. refr. and P. W. M.
1854°og 342'3 I 1753 DA on I n. with same telescope and Sph. Cr. M.
No. 787 = X. 299 = y Ceti.
In the Introduction to my second series of measures of double stars made at Ormskirk
(see Mem. R. A. S. Vol. xix. p. 197), I have remarked upon the extraordinary discrepancies
in the angles of position measured by different observers about the same epoch, and also by the
same observer at different epochs. The doubts thus occasioned respecting the real character of
this beautiful object are unfortunately not removed by more recent results, as appears by the
following comparison:-
ROYAL ASTRON, SOC. Wol. XXXV. S S
3I4.
Rev. W. R. Dawes, Catalogue of
1832.48 P = 287°36 D = 2%90
1841.65
1841.70
1842-99
1843' 16
1846'14
1849'o8
1850: 14
1851'90
1853'o6
1855'o6
288-90
286. I
285'5o
285.7
285'7.
28921
2829
289°23
29O'97
287.47
2.719
2-6 I
2’655
2.6
2-66
2772
3'o8
2751
27,o
2'899
2 on 5 m. -
DA on 11 n, with Mr. Bishop's 7-in, refr. and P. W. M.
O > on 1 n, with 15-in, refr. at Pulkowa.
DA on 5 m. with Mr. Bishop's 7-in, refr. and Pr. Cr. M.
SM Cycle, czi. *
O > on 2 n.
DA on I 1 m. with 64-in, refr. by Merz.
O X on 2 n. -
F on 5 m. with 4-in. refr. by Cooke.
J on 1 n. mean of two sets.
DE on 6 n. (D on 5) with 53-in. dialytic refr. by Plössl.
From the appearance of the star in a good telescope it might be thought scarcely possible
that a difference to the amount of 8° should occur in the mean results of careful observations
by experienced observers; and, as I have before remarked, there seems to be some peculiar
source of difficulty about the star requiring the greatest attention to avoid errors of extraor-
dinary magnitude.
No. 816 = X 3oo.
The regular diminution of angle in STRUVE's measures during four years induced me to
include this star in my observing catalogue; but my observations of 1841 and 1854 agree very
closely with each other, and also with the mean of all the Dorpat measures of position. It is
most probable, therefore, that the star is stationary. .
1832.80 P = 299;7 D = 2.910 2 on 4 n.
1841-89
1854°oo
299°27
299'53
3'ozo
3’O34
DA on 1 m. with Mr. Bishop's 7-in. refr.
DA on 1 m. with 6}-in, refr.
No. 818 = X 305.
The angle of position of these stars is slowly varying in a retrograde direction, as appears
by the following comparison of my observations with those obtained by STRUVE, by whom the
duplicity of the star was discovered. A very decided increase of distance has also occurred.
1829.86 P = 333.65 D = #545
1833'14
I84. I'94
1847.77
1853'58
327'30
32473
3.24°77
322°45
1:670
I'965
2°2 I 2
2°33'O
2 on 2 n.
2 on I n.
DA on 6 m. with Mr. Bishop's 7-in. refr.
DA on 3 n. with 64-in. refr. by Merz.
DA on 4 m. with same telescope.
Micrometrical Measurements of Double Stars. 3 I5
No. 837 = X 311 = H I. 64 = ºr Arietis A B.
This star is unchanged, as appears from comparison of my observations with STRUVE's.
1832-32 P = 1.19% D = #284 > on 5 m.
1848-97 1 zo'70 3° 24′4. DA on I n.
No. 838 = > 333 = 2 Arietis.
My observations of this close star during fourteen years show a decided increase of
distance, with no perceptible variation of angle. Yet there is a difference of 7° or 8° between
STRUVE's angle in 1830 and mine, which might seem too great to be ascribed to error of
observation; though the closeness of the components and the obliquity of the position may
possibly combine to produce it. My results are satisfactorily corroborated by Captain JAcob's
at Madras, as appears in the following comparison: – -
1830, 16 P = 18887 D = &;47 2 on 4 m.
184 I '94 195'48 o'71 I DA on 8 n. (D on 4) with Mr. Bishop's 7-in. refr.
1847.62 195'88 e G DA on 7 m. with 64-in. refr. by Merz.
1848-46 e G o'952 DA on 3 n. with same. -
1853'50 196’ I 5 tº º J on 5 m. with 6'3-in. refr. by Lerebours.
1853.68 tº ºn I ‘OS J on 4 m. with same.
185399 I 95°55 I'oog DA on 1 m. with 64-in, refr.
No. 855 = 2, 369.
From STRUVE's observations at Dorpat, in three different years, it appeared probable that
both the angle and distance of these stars might be increasing. This may possibly be the
case in the distance, but the position seems to be stationary.
1829'55 P = 2883 D= #253 2 on 3 m.
1847'93 27.72 3-5 12 DA on I n, with 64-in. refr. and D. I. M.
1851'5o 26-83 3-622 DA on 3 n, with same telescope and P. W. M.
1856-73 26.7 3’61 DE on I n. Astr. Wach. No. 1 I 18.
No. 861 = 95 Ceti = A. C. 2.
This elegant object was discovered to be double by Mr. ALVAN CLARR, of Boston, U.S.,
with the excellent 73-inch O.G. of his own construction, which afterwards came into my
possession. In these latitudes it is a very difficult object, from the closeness and great
316 Rev. W. R. DAWEs, Catalogue of
inequality of its components; and may, therefore, have easily escaped STRUVE's researches for
double stars at Dorpat, even if at that time it presented the same appearance as now. I am
unacquainted with any other measures than my own.
No. 864 = 2, 389.
The apparent change of angle deduced from comparison of Sir JoHN HERSCHEL’s measures
with each other, and with my result in 1833, is not supported by my subsequent observations.
(See Memoirs R. A. S. vol. viii. p. 66.)
1828-69 P = 6#22 D = 468 H on I n, with 5-in. refr.
1830.98 63' 18 3°23 H on 1 m. with same telescope.
1831°oo - 61-82 2'805 X on 4 m.
1833'90 61.68 2.72 DA on I n. with 3.8-in. refractor.
1837'o4 62:30 27 Io DA on I n. with same.
1854-75 62-66 2.824 DA on I n, with 73-in. refr. by Al. Clark.
No. 865 = X 412 = 7 Tauri A B.
The decrease of angle in the close pair, already indicated by STRUVE's measures, has
continued, as appears by the following comparison of results:—
2 on 5 m.
1830'39 P = 26992 D = &692
1836'90 264'90 o' 595 2 on 2 n.
184 I'96 263-47 o:6 est. DA on I n. with Mr. Bishop's 7.-in. refr.
1842°o; 262-8 o'69 > on 3 m. with 15-in. refr. at Pulkowa.
1846'91 259°92 o:65 DA on 1 m. with 63-in. by Merz.
1850: 18 262-6 o'59 O X on I n. with 15-in, refr.
Notwithstanding the difficulty of the object, and the discrepancy in the Pulkowa result for
1850, the progressive decrease of angle can scarcely be doubted; the distance remaining nearly
stationary. - -
No. 867 = O > 59.
There is no evidence of change in this star, though the agreement of the measured
distances is not so good as might have been expected.
O X on 2 n. communicated to me by letter.
DA on 2 n. (D on I).
DA on 3 n.
1846:51 P = 34870 D = 3,600
1847"O4 3.48° 58 2°28o
1854°og 348-45 2-378
Micrometrical Measurements of Double Stars. 3 I 7
No. 872 = 2, 425 = H II. 52.
A difference of +6°2 between the position measured by H in 1782 and that obtained by
STRUVE in 1830, seemed to indicate that the angle was increasing; but as my angle lies
between them, there appears no ground for supposing the star to have a binary character.
1782.68 P = 98’40 D = ".. H
1830'16 IoA'6o 2-873 2 on 3 n.
1830.82 I O2'95 2'99 DA on 2 n. (D on 1), with 3.8-in, refr.
1830'97 IO3'44. 2.89 H on 2 n.
1831.87 Io2 17 3°23 H on I n.
1840-80 Io2.78 3°o 19 DA on 3 n. with Mr. Bishop's 7-in. refr.
1848' I 3 IoI '73 2.8o0 DA on I n. with 63-in. refr. and Sph. Cr. M.
1848.66 Io2:76 tº º DA on 3 m. with same tel. and P. W. M.
1849'98 e G 2-864. DA on 2 n. with same instruments.
1854°o3 I O2°o 3 2.719 DA on 2 m. with same.
No. 883 = O > 65 = P III. 170.
One of the Pulkowa discoveries. From a comparison of O X's measures communicated to
me by letter, after he had received mine, there appears no evidence of variation during the
short interval between the observations. -
1846. I 5 P = zož12 D = d'é;8 O X on 5 m. with 1 5-in. refr.
1847-88 202'85 o:663 DA on 2 m. with 63-in. refr.
No. 885 = 2 470 = H II. 36 = 32 Eridani.
My observations, compared with the mean of STRUVE's, give very little countenance to the
supposed variation of these stars, and differ but slightly from those of H in 1804.
M/
1804 II P = 347%z D = . . H
1830.82 347' 22 7:02 DA on I n. with 3.8-in. refr.
1833’ I 5 347".27 6,697 2 on 3 m.
1836-31 346'37 7:038 DA on 3 m. with 3.8-in. refr. and P. W. M.
184. I'97 345 °45 6'88o DA on 2 m. with 7-in. refr. and P. W. M. at S. V.
1843 “O2 346.53 6'481 DA on 2 n. with same telescope and Pr. Cr. M. at S. V.
1848: 13 345-67 6:716 DA on 1 n. with 63-in. refr. and Sph. Cr. M.
1853: 18 346'38 6-653 DA on 2 n. with same telescope and P.W. M.
3.18 Rev. W. R. Dawes, Catalogue of
We have also the following by some other observers:–
1831 '91 34% #3 l
1838°o9 346.8 6-8 V, SM
1843'16. 346'5 6-6 ſ
1851'o6 347°53 à 6.75 J with 6'3-in. refr. at Madras
185 I '93 346'55 6'814 F Mem. R. A. S. vol. xxii.
No. 892 = 2 494 = H N. 17.
There is probably a slow diminution of the position-angle of these stars; while the
measures of distance by different observers are remarkably accordant, and afford no evidence
of variation in that element since STRUVE's first measures in 1828.
1828-19 P = 19ío D = #99 > on I m.
1831 - 18 1902 5'o6 > on I m.
1833' 19 1884 5°o9 X on I n.
1841-98 tº º 5'1 1 ; DA on 2 m. with Mr. Bishop's 7-in. refr.
1843"I 3 186'41 e DA on 6 m. with same.
1845-78 18793 5°ogó HI on 1 m. with same telescope.
1846-74 186:76 tº º HI on 1 m. with same (Io obs.)
1848-13 186-67 5°oo? DA on 1 m. with 64-in. refr. and Sph. Cr, M.
1853' I 3 187'o'; 5 178 DA on 1 m. with same and Pr. Cr. M.
1853'48 186'32 5'o61 DA on 3 n, with same and P. W. M.
No. 903 = X 518 = H II. 8o.
Comes S.f. 4o Eridani. The small companion of this star was discovered to be double by
H with his 7-foot Newtonian, and seen as such by STRUVE in the year 1825 with the
Dorpat refractor: but the smallest of the two was estimated to be only of the thirteenth
magnitude, and was too faint for measurement; and it was not subsequently discernible,
though repeatedly looked for. But in 1850, it was examined by his son, OTTO, with the
Pulkowa refractor, and immediately seen to be double. Soon afterwards he requested me
to look at it with my 64-inch refractor by MERz, but gave me no intimation of the relative
situation of the two stars, and scarcely expected that anything could be done with them
by the aid of so small a telescope. I succeeded, however, in obtaining five measures of
the angle, though with great difficulty. The distance could only be estimated. The star
is very remarkable and interesting from the fact, that it partakes of the large proper motion
of 40 Eridani, and also has a slow orbital motion round that star, though at a distance
from it of above 8o". See STRUVE's Positiones Mediae, Introduction, p. ccx.; where is
expressed a strong suspicion of variability of brightness in the smallest star of the close
Micrometrical Measurements of Double Stars. 3 IQ
double; and some measures of it are given, which are the only ones I am acquainted with
besides my own.
1783-o8 P = 3.26% D = 4-8" H
1825' 12 287.7 2 on I n. with the Dorpat 9:6-in. refr.
I 85 o'94 16o'2 3'93 O 2 on 2 n. with the 15-in. refr. at Pulkowa.
1851'o6 15996 3' + DA on 1 n. with 64-in. refr.
1851°50 16o'z 3'85 O X on 2 m. with 15-in. refr.
From the great change of observed angle, STRUVE concludes that the small double is
itself a binary system in rapid motion, and that it was probably single between the years
1825 and 1850.
No. 904 = 2, 520.
A difference of more than 5° in the angle of position of this difficult object, as measured
by STRUVE, its discoverer, in the years 1832 and 1837, raised a suspicion of orbital
Subsequent observations render it doubtful whether the differences may not arise
solely from the closeness of the stars.
motion.
With the exception of one set of measures by Pro-
fessor MÁDLER, I am unacquainted with any other measures than those of STRUVE at Dorpat
and my own.
1832:20 P == ofoo D = 6'823 2 on 3 m.
1837. Io 98.70 o:960 X on 2 n.
184 I 52 98'99 o:870 DA on 3 n. (D on two), with 7-in. refr. at S.V.
1841-8o 97.62 o'45 M on I n. -
1854' I 3 Ioz'90 o'975 DA on 1 m. with 64-in. refr.
No. 908 = 2 535 = Tauri 230.
A comparison of the measures of these stars proves beyond doubt that the angle is de-
creasing, while the distance is unaltered. Except one set of angles by Sir JoHN HERSCHEL,
I am not aware of any other measures than those by STRUvE and myself.
1829' 19 P = 355°oo D = #960 2 on 2 n.
1831-86 354' I 7 - H on I n.
1832.58 353'45 I '92 o X on 2 n.
1833' I 4 352'50 198 X on I n.
184 I ‘4 I I '95 I DA on 5 m. with 7-in, refr. at S. W.
1841 83 345-56 DA on 9 m. with same.
1847°o4 344-62 I '928 DA on 2 m. with 63-in. refr. and P.W.M.
1848' I 3 343-67 I '850 DA on I n, with same telescope and Sph. Cr. M.
I 854°29 34.2°73 DA on 3 m. with 73-in. refr. by A. Clark, and P.W.M.
1854-82 2'o62 DA on 2 m. with same instruments.
32O Rev. W. R. DAWEs, Catalogue of
No. 924 = 2 546 = H II. 54.
The angular movement which was rendered highly probable by comparison of STRUVE's
measures in 1828 and 1833 with each other and with HI’s in 1782, has not been confirmed
by subsequent observations. The series runs thus:–
1782-69 P = zoº D = " H {-
1822:15 189'30 671 > with 4-in. refr. by Troughton.
1828: 15 18965 6.825 X on 2 m. with 9-6-in. refr.
1833'16 186'55 6'87o X on 2 n.
1836-o/ 189-90 6-653 X on 3 m.
I 84O'94 7.219 DA on 1 n, with 7-in, refr. at S. V.
1841'46 187.1 o DA on 2 n. *
1854'09 187°oo 6747 DA on 1 m. with 64-in, refr.
No. 927 = X 554 = 80 Tauri.
This delicate and pretty object, discovered by STRUVE, is by no means so easy to
measure accurately as might be expected from its appearance. This is unfortunately proved
by the great discrepancies in the results even by the same observer. It has not been
neglected as the following series will show:—
O
1831-18 P = 12.90 D = 1737 2 on 4 n.
1836.96 9.8o 1.5 est. DA on 2 n. with 3.8-in, refr.
1837:22 I I "O I ‘4. SM -
1839'16 I 3'9 I-6 SM
1840. Io ce º 1.665 DA on 1 m. with Mr. Bishop's 7-in. refr.
1843°o9 12:51 tº º DA on 7 n., with same.
1843’t I I 5-2 I '8 SM -
1851'51 57 I 51 O > on 1 n. with 15-in, refr.
1853' 14 I O' 2 O I'5o J on 2 n. with 6'3-in. refr.
Nothing can be deduced from this series favourable to orbital motion. Yet the stars
are proved by STRUVE to be physically connected, as otherwise the proper motion of the
larger star (assuming the smaller to have none) would have altered the angle of position
to 3.32° for 1851. See Positiones Mediae, Introduction, p. ccxi.
No. 934 = 2 559 = H N. 132.
No variation appears to have occurred in these stars since STRUVE's first observations
of them in 1828. The mean results by different observers stand thus:–
Micrometrical Measurements of Double Stars. 32 I
1830.67 IP = 27867 D = #oss 2 on 4 n.
1831-86 276'30 3' I I H on I n.
1836'97 277°o 3 3.212 DA on 2 n. with 3.8-in. refr.
1852'o8 277'25 2.953 DA on 4 n. (one at S. V.)
No. 938 = O > 91.
Of this difficult object, discovered with the Pulkowa refractor, Mr. OTTO STRUVE sent
me some measures by himself. The apparent increase of the angle may probably arise
merely from the difficulty of the observation.
O f/ O º -
1845' 17 P = 52.2 D = o'75 O > on 1 n. with 15-in. refr.
1847'o8 54:60 o:7 est. DA on 1 m. with 63-in. refr.
1849' 19 6 I* I o:78 O X on I n, with same.
No. 939 = O 2 92 = 5 Aurigae.
Of this elegant object, discovered at Pulkowa, M. OTTO STRUve sent me his measures,
from which mine differ more widely than I should have expected, especially in angle ; but
the position is very oblique.
1846-85 P = 2.26% D = 2.87 O X on I n.
1847'o'8 233'35 2.916 DA on 1 m. with 64-in. refr.
1848' 2 I 223'5 2:54 O > on I n.
No. 940 = X 622 = H I. 68.
There is no evidence of change in this star. In the note appended to SouTH's measures
of it at Passy, the position measured by H is quoted as “84°54′ north following;” and
hence a change amounting to II* 17' was supposed to have occurred at the epoch of SOUTH's
observation which gave the angle “83° 49' south following or north preceding.” But in
the Catalogue of H in the Phil. Trans. (vol. lxxv.) the position is stated to be “84°54'
south following.” Hence, compared with SouTH's result, the difference is only – 1° 5'.
I/
1783'o6 P = 1790 D = ... H “A little unequal. With 460, near 1 diameter.”
1825°oA. 173'82 2:565 S on 2 n. with 5-in. refr. by Tulley.
1829-88 I 82°oo ... H on I n, with the same telescope (Z + 180°).
- “Oblong, but hardly divided.”
1832°og 17990 - 2’643 2 on 3 n.
1840: 12 175-88 2.358 DA on I n.with Mr. Bishop's 7-in. refr. by Dollond.
ROYAL ASTRON, SOC. Wol. XXXV. T T
322
Rev. W. R. DAWEs, Catalogue of
It should be noted that Sir John HERSCHEL's observation was made with the 7-foot
refractor while the object-glass was still severely pinched in its cell, in which state it was
when it came into his possession by purchase from Sir JAMES SouTEI.
No. 941 = O > 98 = 14 (i) Orionis.
There appears to be decided evidence of binary character in this object, which is one
of the discoveries of Mr. OTTo STRUVE with the Pulkowa refractor. He has lately been
so kind as to supply me with his measures for comparison with my own, º
(/
I 844°oS P = 2588o D = M on I n.
1844-95 251 15 1'1 15 O > on 4 n. -
1848' I I e e 1.179 DA on 1 m. with 63-in. refr. and Sph. Cr. M.
“Suddenly clouded.”
1852: 15 24.5°43 ... M on 1 n.
1852'22 247 Io o’93 o O 2 on I n.
1854-82 240-88 1.294 DA on I n. with 74-in. refr. by A. Clark and
- - P. W. M. A = 6-8; B = 7:3.
1859'z I 237:8o I 240 O 2 on 2 n.
No. 943 = 2 648.
My observations of this star compared with STRUVE's do not decidedly indicate any
change.
- O // -
1831. 16 P = 74.27 D = 4-68o X on 4 n.
1846'59 73°o9 4,645 DA on 5 n.
The colours of these stars have been very differently estimated. STRUVE calls A, yellowish,
and B, bluish. On one night, with Mr. BISHOP's refractor, I judged A to be red, and B
paler red. In 1844, with the same instrument, I called A, white. In 1846, with my 63-in.
refractor by MERZ, I judged A to be reddish, and B, dusky purple, to which last I have
appended a note of uncertainty. The observations of 1848 were taken with illuminated
webs in a dark field; and were considered very unsatisfactory, and consequently a very low
value assigned. I consider this mode of observation nearly useless when an accurate result
is desired.
No. 948 = 2 653 = H IV. 19 = 14 Aurigae,
A very fine star. STRUVE judged the large star to be greenish; in my observations at
Wateringbury with MERz's refractor it was judged to be yellow; but we agree in the blue
tint of the smaller star. A third star of the 11th or 12th mag. discovered by STRUVE was
Micrometrical Measurements of Double Stars. 323
noted by me, but not measured. From a difference of nearly 7° between his results and
H’s, STRUVE concluded that there might probably be a slow orbital movement; but sub-
sequent observations do not confirm this supposition.
//
1781.83 P = 232°37 D = . . H
I 822. Io . 224'38 14-61 H and S.
1830°55 225'48 14,653 X on 3 n.
1832-81 224' 5 I 3°5 SMI “A, pale yellow; B, orange.”
1847.78 225-86 14:914 DA on 2 n.
Of the third star SMYTH says, that it “requires the most careful attention even to be
perceived by occasional glimpses; but when seen has a peculiar deep purple tint, which
strikes singularly on the eye from so excessively minute an object.”
No. 951 = 2 694.
Since STRUVE's discovery and first measures of this close star, a small retrograde motion
seems to have occurred. Though the object is difficult, the differences in the results appear
to be too great to arise from mere errors of observation.
1827. 16 P = 6% D = *34 2 on I n.
1828-19 3'2 I '32 2 on I n.
1833. 19 2'4 I 37 X on I n.
1841-8o 357.75 1.199 DA on 3 n. with 7-in, refr. and P.W. M. at S.V.
1843'20 358°46 I 33 o DA on 2 m. with same, and Pr. Cr. M.
No. 956 = D 5 = n Orionis.
This close and beautiful object was discovered by me to be double on Jan. 15, 1848,
with an aperture of only 4}-in, which I happened then to be using on my 63-in. refractor.
With a distant star of the I oth mag. n.f. it forms H VI. 67; but at the time of that
observation the large star was probably single. Certainly it could not formerly have been
so easily separated as it is now, or its duplicity could scarcely have escaped the keen
scrutiny of H and STRUVE. The distance may have slightly increased since my first measures.
Comparing the mean results, we have,—
1848: 1 I P = 88:70 D = 6947 DA on I n, with 63-in. refr. and Sph. Cr. M.
1848-20 86-60 o°935 DA on 9 n. with same, and P. W. M.
1851.69 86-28 I'o66 DA on 4 n. with same instruments.
1853' 12 87°o4 I'o'7 J on 3 m. with 6'3-in. refr. at Madras.
I 853'99 83.76 o:75 est. J on 2 n. with same.
324 Rev. W. R. Dawes, Catalogue of
No. 971 = 2 719.
As a wide double star this object was discovered by H, being H Iv. 11o but STRUVE
with the Dorpat refractor detected that the larger star was itself double “ea, vicinissimis.”
Of the close pair, A and B, we have for comparison :- -
- 1833'47 P = 326’47 D = 6678 2 on 4 n.
I 842° 13 3.28°o5 o'911 DAon in, with Mr. Bishop's 7-in. refractor.
Of A and C we have the following:—
1782'98 P = 344% D = 1éoz H
1825' 17 351.87 15:446 S on 2 m. with 5-in, refr. at Passy.
I 833°34 35 I'5o 14.828 X on 6 n.
1842° 13 351-85 15-201 DA on I n.
The difference of about 7° between H's result and more recent measures seems, there-
fore, to arise from error in the earlier observation.
No. 973 = D 6.
This close and elegant little object was discovered by me to be double, 1854, Jan. 8,
with the 63-in. refractor. I am not acquainted with any other observations of it than my
own. Both the stars were judged to be of a pale yellow. This star is BESSEL [WEISSE] v. 520.
No. 975 = X 728 = H I. 25 = 32 Orionis.
This close object was discovered to be double by H in 1782; and from a difference of
about 14° between his measure and STRUVE's in 1830, there seemed some reason to suspect
an orbital change, which has not, however, been supported by subsequent observations, as
appears from the following comparison :-
1782°o; P = 21783 D = .. H
1830 Io 2 I 4'55 I '92 H with 5-in, refr.
1830.96 2O3°75 I'oao X on 4 n.
1831: 13 2O5*4. I ‘O SM
1839:20 206-2 I "O SM
I844.94 205'o8 o 893 DA on 3 n.
1853°o3 20I '97 - I'1 1 J on 2 m. with 6'3-in. refr.
Micrometrical Measurements of Double Stars. 325
No. 978 = 2 742 = H I. 7o = Tauri 380 (Bode).
There seems to be some ground for suspecting a slow increase of the angle, while the
distance probably remains unaltered. -
1782.26 P = 23#60 D = ".. H
1829-91 246'88 3'49 H on 2 n.
183 o'22 246:23 3°313 2 on 3 n.
1831: 17 247°92 3’ I 5 DA on 2 n. with 3.8-in. refr.
1837. Io 25 I’Io 3'325 2 on 2 n.
I 84 I ‘22 249'68 3°469 M on I n.
1841-62 249-69 3.277 DA on 3 n. with 7-in. refr. and P. W. M.
1843' 17 249'85 3.286 DA on I n. with same, and Pr. Cr. M.
1848: 13 25 I ‘og 3.343 DA on I n, with 63-in. refr. and Sph. Cr. M.
I 854° 14 251 °4 I 3.235 DA on 3 m. with same, and P. W. M.
No. 986 = X 748 = 0, Orionis.
The minute companion of the preceding star (in right ascension) of the trapezium in the
nebula of Orion was discovered by STRUVE on 1826, Nov. 11, who estimated it to be of the
I 1-3 mag. It is surprising that it should never have been seen before, so frequently and
carefully as this portion of the great nebula was observed by both the HERSCHELs. Yet
there seems to be no ground for supposing that the small star is either new, or in any
considerable degree variable. Nor is there evidence of change in its relation to 9, , as appears
by the following comparison of results: —
1832 53 P = 353°60 D = 3.860 > on 7 n.
1836-8o 354' 5 4°o est. DA on I n. with 3.8-in. refr.
I 847-O4. 35 o' 57 3.828 DA on I n. with 63-in. refr.
1853'oz 352°o 5 3'98 J on 2 n. with 6'3-in. refr.
The difficulty of the object sufficiently accounts for the discrepancies in the results.
No. 987 = 0, Orionis.
This is the brightest star in the trapezium of Orion, being the third in the order of right
ascension. It has an exceedingly minute companion which had been overlooked by both the
HERSCHELs and STRUVE, until it was discovered by Sir JoHN HERSCHEL, while examining
the trapezium through Sir JAMEs SouTH's 20-foot refractor of 113 inches aperture, on the
13th February, 1830. In a fine state of the air it is usually not very difficult to see with an
object-glass of 6 inches aperture, which is sufficiently perfect to define well the bright star;
326 Rev. W. R. DAWES, Catalogue of
yet, from considerable variations in its visibility, while that of the fifth star continues uniform,
there seems to be good reason to Suspect some variability of its brightness, to the extent
probably of 1 or 13 magnitude.
… O A/
1842-33 P = 127°34 D = 2792 DA on 3 n. (D on 1), with Mr. Bishop's 7-in. refr.
1847'oA. I 24'47 4'1 13 DA on I n. with 63-in. refr. and P.W. M. with
- - - illuminated threads.
1853°o2 I 23°40 3.26 J on 2 n. (D on 1), with 6'3-in. refr. at Madras.
There seems to be no evidence of relative motion.
No. 991 = D 4 = 42 Orionis.
- , The small close companion was discovered by me, 1847, Dec. 12, with my 63-in. refractor
by MERz. Though a somewhat difficult object, from the closeness of the stars and their great
difference of magnitude, it is surprising that it should not have been detected by either of the
HERSCHELs or by STRUVE. -
1848'o'7 P = 21992 D = #965 DA on 2 n. with 63-in. refr.
I 853’ I 5 2 19: Io 1.65 J on 3 n. with 6-3 in. refr.
No. 994 = 2 752 = H III. I2 = . Orionis.
A difference of +8°12 in the angle between H's measure in 1779 and Sir JAMEs SouTH's
in 1824 raised a suspicion of motion which is not corroborated by subsequent observations.
O A /
177977 P = 133.85 D = 12.5o H
1824'82 I4 I'97 12'o65 S on 5 n.
1831: 17 I4 I'48 I 1.89 DA (P on 2 n. D on 1), with 3.8-in. refr.
1831-86 I 42° 17 I I 32O > on 3 n.
1832-13 141 '7 I I'5 SM
1847-65 141-28 1 I-628 DA on 2 n. with 63-in. refr.
No. 996 = D 3 = L 10567.
The duplicity of this star was discovered by me on 1847, Nov. 1. It is Lalande Io;67
of the British Association Edition. It is also No. 135 of Sir JoBN HERSCHEL's Catalogue of
the Stars in the great Nebula of Orion. (See Results of Astronomical Observations at the
Cape, p. 28.) But it was not noticed as double with the 20-foot reflector, nor does it appear
in STRUVF's great Dorpat Catalogue. I am unacquainted with any other measures of it than
Micrometrical Measurements of Double Stars. - 327
my own. It is not of easy measurement in these latitudes, and the distance which I observed
on one night only, I believe to be considerably too large; the true distance probably not
exceeding 1".
No. 999 = 2 753 = H III. 64 = 26 Aurigae.
The measures of Sir JAMEs SouTH, at Passy, in 1825, compared with those of H in 1782
gave rise to a suspicion of change, which subsequent observations have not fully confirmed.
The following are a few of the results : —
1782.68 P = 27:60 D = 13417 H
1825'03 268.37 12:327 S on 2 n.
1828-61 268°o2 12:343 2 on 3 m.
1833°og 267-8 I 2°3 SM
1844'84 268:25 12'423 DA on 3 m.
1853-19 267'43 I 2°42 J on 2 m. with 6'3-in. refr.
No. 1002 = x 774 = & Orionis.
That the duplicity of this fine star should have escaped the scrutinizing eye of Sir WM.
HERSCHEL is not easily accounted for, unless it was in the year 1782 so nearly single as to be
not even elongated in the 7-foot reflector. Yet the series of observations since 1822 does not
show any rapid change either in angle or distance, as will sufficiently appear from the following
Selection of epochs:—
1822-61 P = 15&os D = #62; H and S
1825.20 I 53°30 2.338 X on 5 m.
1831-22 I 5 I 3o 2: 347 X on 6 n.
1832. I I I49'82 2’62 H on I n.
1832°56 148'38 3'oo DA on 4 m. with 3-8-in. refr.
1835'27 148°48 • * DA on 2 n. with same.
1836-22 I 5.1 °34. 2°55o 2 on 5 n.
I 839'19 1488 2'5 SM -
1841 oz 146'59 2-671 DA on 6 m. with Mr. Bishop's 7-in. refr, and P.W. M.
I 842-99 I 48.4. I 2-573 DA on 2 n. with same and Pr. Cr. M.
1847-84 I 48°73 2-627 DA on 6 m. with 63-in. refr.
1851. I I 149-6 2-64.2 F on 2 m. with 44-in. refr.
1851-18 I 52' I 5 2’64 J on 2 n. with 6'3-in. refr. and triang. aperture.
1851-85 I 54-6 2-66 X on I n. with 15-in. refr.
1852'o6 148'98 2.627 MI P. by 16 obs, D by 32, with 44-in. refr.
I853' 13 14870 2-639 DA on 1 n, with 63-in. refr. and Pr. Cr. M.
328 r Rev. W. R. DAWEs, Catalogue of
f/
1853-18 P = 14994 D = 229 J on 4 m. with 6'3-in. refr.
1853°77 I 51°56 2'32 J on 4 m. with Same.
1854'o6 148-89 2°32 J on 2 m. with same.
1854: 17 I49'22 2'483 DA on 1 n. with 63-in. refr. and P.W. M.
1854-56 I 51' 12 2'446 DE on 9 n.
Considering the moderate altitude of the star at most of the places where these observations
were made, and the rarity of the favourable atmospheric circumstances which such an object
requires, as well as the oblique position of the components when near the meridian, it may
reasonably be doubted whether the differences among the results arise from any other cause
than errors of observation, or some personal peculiarities of the different observers.
No. 1 or 9 = X 796.
No change is apparent from comparison of my observations with STRUVE's.
1830'79 P = 6:16 D = 3596 2 on 5 n.
1848'16 61-82 3:679 DA on I n.
No. 1020 = 2 835.
I am unacquainted with any other observations of this star than STRUVE's and my own;
and their difference is not sufficient to render any change probable. The measures are rather
difficult, and there is a difference of 5°6 among the three sets of observations at Dorpat.
1830-88 P = 14660 D = 2240 2 on 3 m.
1848: 56 145-64 2'452 DA on 2 n.
No. 1022 = A. C. 3.
This delicate object (which is identical with BESSEL [WEISSE] vi. Io9) was discovered to
be double by Mr. ALVAN CLARK, of Boston, U.S., in Feb. 1854, with the 73-in. object-glass,
made by himself, which was subsequently in my possession. I have noted the colours thus:
A, yellow ; B, blue, or lilac. Captain JACOB has measured this star with the Madras
equatoreal.
1854: 17 P = 1736, D = #11o DA on I n. with 63-in. refr.
2858-o/ 17ool o'85 J on 2 n. with 6'3-in. refr.
Micrometrical Measurements of Double Stars. 329
No. 1023 = X 881 = 4. Lyncis.
Discovered by STRUVE. At present there is no certain evidence of change.
1830:28 P = 88%? D = cºsis 2 on 4 m.
1836-97 89'93 o'95 est. DA on 1 m. with 3.8-in. refr.
1837-89 90°2 I "O SM -
1842'26 89-97 o'853 M on 3 m.
1848:22 9 I'5o 2 o'769 DA on 1 n. with 63-in. refr.
The closeness of the stars might account for even greater differences in the results.
No. 1024 = X 918 = Aurigae 229 (BODE).
One of STRUVE's discoveries. The measures give no evidence of relative motion.
1829:26 P = 323.43 D = £450 2 on 3 m.
1852°39 323'54 4'596 DA on 2 n
No. 1026 = x 921 = H N. 2.
Discovered by H in 1784, who gives no measures. The results of STRUVE's measures and
my own are nearly identical.
X on 6 n.
DA on 2 n.
1831°38 P = 38. D = 16282
1848: 19 3-83 16:272
No. 1028 = 2 932.
Considering the moderate closeness of these stars, there seems to be some reason to suspect
them of an orbital change since their discovery by STRUVE. The gradual diminution of angle
in the three years of his observations led me to re-observe them. They probably form a
binary system.
1828-24 P = 34.3% D = #52 2 on I n.
1830'22 34 I'8 2'44. 2 on I n.
I 833' I 4 34O'9 2'32 2 on I n.
1848: 19 334°53 2°434 DA on I n.
1851’ I 5 336-78 2°565 M on 2 n.
1852:21 335'90 2.719 M on 2 n.
MÄDLER's results render it probable that my angle is rather too small, yet afford support to
the idea of its diminution since 1828.
Royal ASTRON. Soc. Vol. XXXV.
U U
33O Rev. W. R. DAWEs, Catalogue of
No. 1029 = x 942.
There is no evidence of alteration in these stars since STRUVE's observations in 1820.
3
183089 P = 244°is D = 3.93 > on 3 n.
1841-21 245.45 3'498 DA on I n.
1853'21 24.5'50 3°723 M on 1 n.
No. 1030 = 2 950 = 15 Monocerotis.
The earlier observations of the closer pair of this triple star discovered by STRUVE seemed
to indicate motion, which is in some degree countenanced by subsequent measurements.
1825' 19 P = zoś60 D = #727 2 on 3 m.
1831-24 . 207'o'; 2*745 2 on 2 n.
1832: 18 209-73 2750 2 on 3 n.
1836:15 208-3 2°8 I 2 on I n.
1842°o9 209-32 3°o75 DA on 5 n.
1851’ 13 212°57 2:879 M on 3 m.
1852-18 2 I 2'34. 3°2 Io M on I n.
The very minute distant star I have not measured, though it was seen at an angle of about
12°6 and distance 11"+ ; and also a fourth in the n. p. quadrant, whose position is about 308°,
and distance 4o"+. -
No. 1035 = 2 948 = H I. 6 = 12 Lyncis.
The close pair of this pretty triple star, discovered by H, evidently form a binary system,
as appears from the following results:— -
//
P = 18:38 D = . . H
1780.76
1823'28 158.65 2'593 H and S on I n.
1825’25 I 54°35 2°529 S on 4 n, with 5-in. refr. at Passy.
1830'24. I 57'25 1.76 H on 3 m.
1831 “Io I 53°7o I'532 2 on 5 n.
1831: 19 I 53°o2 1.675 H on 2 n.
1831-62 I 53.8o tº º DA on 3 m., with 3.8-in. refr.
1832.96 I 54°3 1-6 SM
1833-13 I 53°32 I-64 DA on 2 n. with 3.8-in. refr.
1836-97 149°50 175 est. DA on I n.
Micrometrical Measurements of Double Stars. 33 I
1841' 20 P = 14842 D = #72 DA on 2 m. with 7-in. refr. at S. W.
1842'26 148°48 I'47 1 M on 3 m.
1846-18 14672 I'60o M on 1 on.
1847:25 146°oo I'547 M on 2 n.
1848:22 I 43°35 1.689 DA on 1 m. with 63-in. refr.
1848.35 I44'87 1'569 M on 2 n. • * -
1851 12 142.62 1-654 M on 3 n.
There is no sufficient evidence of change in the relative position or distance of the more
distant star C.
No. 1042 = X 964.
There may possibly be some diminution of distance in this star.
1831°29 P = 19347 D = 1687
1848.25 I94°oS I ‘455
2 on 3 m.
DA on I n.
No. 1043 = X 982 = H III. 47 = 38 Geminorum.
A slow diminution of the angle of position of this double star, which was discovered by
HERSCHEL in 1781, is well established; but the supposed diminution of distance seems to be
very doubtful. This fine object has been well attended to by various observers, from whose
results the following are selected:— -
1781'99 P = 17990 D = #80 H
18oz. 26 176' 10 - tº H
1822-67 I 74°4O 5-528 H and S on 3 n. (D on 2).
I829:24 174.88 5:736 X on 5 m.
1832'92 I 72°42 5'948 DA on 1 m. with 3.8-in. refr.
1836-17 I7 I '93 5’799 DA on I n. with same.
1839'17 1707 5.8 SM
1841-29 169'58 6 o'71 DA on 3 m. with 7-in, refr. at S. V.
1843’ I 5 169:35 6°og8 DA on I n. with same, and Pr. Cr. M.
1846-27 169'8o 6:22 J on 2 m. with 3.8-in. refr. at Poonah.
1851. Io 168°o? 6°oo J on 2 n. with 6'3-in. refr. red. to 4'o in.
1851'45 168°oo 6'ooz DA on 2 n. with 63-in. refr.
1851.89 168-87 6:25.1 F on 5 n. with 44-in, refr.
1852.63 168°37 6:03.2 MIP by 16 obs., D. by 22, with 44-in, refr.
1854'46 168.36 6'o'73 DE on 7 n. •
332 Rev. W. R. DAWEs, Catalogue of
No. 1049 = 2 1037.
A close double star discovered by STRUVE. The series of observations both by STRUVE
and other observers affords evidence of a slow diminution of the angle, while the distance has
probably not varied much.
1827.27 P = 3378o D = #145 2 on 2 n.
1831-28 339'25 I'oZo. 2 on 2 n.
1832'70 329'95 1° 125 X on 2 n.
1836-26 327°43 I'323 2 on 3 n.
1843' 17 326'79 1, 182 DA on 4 m. with 7-in. refr. and Pr. Cr.M. at S.V.
1848-17 324'67 1.323 DA on I n. with 64-in refr.
1852′37 3.24°34 1.372 M on Io n.
No. 1051 = 2 1061 = A Geminorum.
A bright star with a very small companion, discovered by STRUVE. Though the differ-
ences in the results obtained are considerable, they probably arise from the difficulty of the
object.
1829'86 P = 3093 D = 9560 2 on 3 n.
1838-79 29°2 Io'3 SM
I834’ I 5 33°45 9'812 DA on I n.
No. 1053 = X 1070.
A close double star discovered by STRUVE. The steady increase of the angles measured
by STRUVE in three different years gave hopes of relative orbital movement, which however
have not been corroborated by my observations.
1829:23 P = 3172 D = #77 2 on 1 m.
1830-27 318: 1 2*OO 2 on I n.
I 833'14 322°4. I '84 2 on I n.
1842°o7 32O' Io I '904 DA on 5 m. with Mr. Bishop's 7-in, refr.
1849-26 3 I 9'52 I '904 DA on 1 m. with 63-in. refr.
The mean of STRUVE's results for the three years scarcely differs from mine in 1849.
Micrometrical Measurements of Double Stars. 333
No. 1059 = 2 1083 = H III, 48.
A difference of — 6°.83 between the angle measured by H in 1783 and by SouTH in 1824
rendered a slow retrograde motion probable; which, however, has not been subsequently
confirmed, as appears from the following results:—
1783'oo P = 4&io D = &z; H
1824'2 I 39°27 6'516 S on 2 n.
1828-61 42'60 6-200 X on 3 n.
1830'13 42°57 8°o I H on 2 n.
1831. 18 43°24 6'50 DA on 3 n (D on 1 n), with 3.8-in. refr.
1840.65 43'2 I 6784 DA on 2 m. with 7-in, refr. at S. V.
1854, 18 44°oo 6-573 DA on 1 n. with 63-in. refr.
No. 1063 = X 11 Io = Castor.
The measures of this splendid binary star are so numerous by almost all double-star obser-
vers that it may suffice to bring together here some of the more recent results for comparison
with those obtained by myself at about the same epoch :-
1830'95 P = 2588 D = #7 SM
1831'o6 259°38 4'730 B Untersuchungen, vol. i. p. 295.
1831-22 258.32 4'572 DA on 5 m. with 3-8-in. refr.
1831 31 259'58 4'464 2 on 5 n.
183 I'91 259' 18 4:786 H on Io n.
1832-12 258'42 ... DA on 14 m. with 3.8-in. refr.
1832-17 we e 4:708 DA on 10 m. with 3.8-in. refr.
1832-86 257'72 4°525 2 on 4 n.
1833’ Io - - 4'896 H on 3 m.
1833. Iz 256'76 ... H on 6 n.
1833° 14 º 4:781 DA on 6 m. with 3.8-in. refr.
1833’ I 5 2.58:1 o ... DA on 12 n. with same.
1834'o8 257-23 . . . DA on 3 n.
I834' I 3 e - 4.855 DA on 2 n.
I 834'24. 256'3 47 SM
I 835°33 255'48 4'734 2 on 5 n.
1836-31 255’2 4-8 SM
1836-39 255'73 4'833 DA on 3 n. with 3.8-in. refr.
1838.21 254°95 4'87 I DA on 4 n. (D on 2), with same.
1838.33 254'9 4.8 SM
1838'34 254°33 4:783 2 on 3 n.
1838-34 254'47 4'833 O 2 on 3 m.
334
Rev. W. R. DAWEs, Catalogue of
1840-20 P=254°, 3 D=4937
1841. I I
1842°o8
1842-3o
1843' 13
1843' 16
1845'95
1846-73
1847:25
1848'13
1848'24.
1848-28.
I 849:32
1851 "oA.
1851.21
1851-88
1852°oA.
1852:20
1852°34
1852-66
1853°oS
1853' I 3
1853'34.
1854°23
1854'38
252.82
252°38
252: 17
25.2°3
25 I-72
249'8o
249'46
249'85
249'24.
249' 16
249'54
248-97
248-67
248 I I
247-65
247°97
246'39
245'86
246'39
247°32
245'87
246-26
246’21
244°72
4.886
4'913
4.793
4'9
4'87o
5°ol 4
5° 14o
4'977
5' 20
5°o27
5°o'74
5'o68
5*O44
5°o75
5°o7o
4-826
4:816
5°o83
5’ I 57
4’93 I
5°og8
4'945
DA on 5 m. with Mr. Bishop's 7-in. refr.
M on 5 n.
DA on 6 m. with Mr. Bishop's 7-in. refr.
M on 6 n. -
SM - - - • ' -
DA on 4 n. with 7-in. refr. and Pr. Cr. M.
HI on 11 n. with Mr. Bishop's 7-in. refr.
HI on 4 m. with same. -
DA on 5 n, with 63-in. refr. -
DA on 2 n. with 63-in. refr. and Sph. Cr.M.
DA on 7 n. with 63-in. refr. and P.W. M.
W C B on 2 n. with 15-in. refr. by Merz.
DA on 4 n.
F on 6 m. with 44-in. refr.
DA on Io n.
M1 P. by 32 obs. D. by 64.
F on 6 n.
DA on I n.
M on 9 n.
M on 5 n.
J on 3 m. with 6.2-in, refr. by Lerebours.
DA on 3 m. with 64-in, refr. and Pr. Cr. M.
M on 9 n.
DA on 7 n. (On3 with 63-in.refr. and on 4 with A.Clark's 73-in.)
M on I 8 n.
In the Monthly Notices of the R. Ast. Soc. for Dec. 1845, Mr. HIND has given the elements
of the orbit of Castor, as computed by him from all the observations he was acquainted with
between 1718 and 1845. Referring to them, he remarks, “The elements are entirely different
from those previously computed by Sir JoHN HERSCHEL and M. MÄDLER ; and this difference
is materially owing to the great influence exercised by the recent measures at Mr. BISHOP’s
Observatory by Mr. DAWES.” The results thus arrived at are as follows; those given by
Captain JACOB at about the same date being added for comparison:—
Mr. Hind in 1845. Capt. Jacob in 1846.
Perihelion Passage .. 1699:26 1703'30
Projected Place of Perihelion.. 8°. ; io &
Node tº e e Q e O © tº II 24 Io o
Angle between Perihelion and Node on Orbit 356 22 O O
Inclination 43 I 4. 43. I7
Eccentricity o'2405 o:30o
Micrometrical Measurements of Double Stars. 335
Mr. Hind in 1845. Capt. Jacob in 1846.
Mean Annual Motion tº º tº º gº 34% 63 tº . o's 5 I 2
Semi-axis Major . . .. ... ... 6%oo 6:30
yrs. yrS.
Period .. tº e tº c tº º tº º 632'27 653' I
The close agreement of the two orbits is very remarkable and gratifying, though Captain
JACOB considered his results as only a rough approximation.
No. 1119 = O > 175.
This very close double star is No. 14704 of BAILY's Lalande, and also B.A.C. 2489. Its
duplicity was discovered at Pulkowa with the 15-in. refractor by Mr. OTTO STRUVE, who has
kindly communicated to me by letter a series of measurements by himself for comparison with
my own. Professor MÁDLER has also observed the star at Dorpat.
1845-77 P = 33676 D = &468 O X on Io n.
1846'3 I 333°52 O'450 M on I n.
185 I'33 334°9 I o°375 M on 2 n. -
1854:28 329°38 o'5 est. DA on I n, with 73-in. refr. by Alvan Clark.
No. 1120 = X 1121 = H II. 63.
A difference in the angle of + 4°52 between STRUVE's results in 1831 and those in 1782
by H, who discovered this double star, led to a suspicion of relative motion; which however is
rendered doubtful by the close agreement of modern observations.
1782-78 P = 3ooºo D = 6; + H
1825'oz 3O3°33 7'437 S on 2 m. with 5-in. refr. at Passy.
183 I ‘44 3O4·72 7°455 2 on 4 n.
1834-21 303'8 8°o SM
1841-21 3o4.87 7-615 DA on I n. with Mr. Bishop's 7-in. refr.
1851'22 303:45 7’og J on 2 n. at Madras.
No. 1121 = x 1126 = H I. 23 = P. VII. 170 = Canis Minoris 31 (B).
Discovered by H in 1781.
From a difference of nearly 1 o’ between his measure and the
observations of H and S in 1823, a slight suspicion arose of binary movement, which subse-
quent measures do not well support, as appears from the following selection of epochs:—
336 - Rev. W. R. DAWEs, Catalogue of
A/
1781'91 P = 1.17%; D = . . H
1823: 13 127'13 . . . H and S on 2 n.
1826, 18 130-67 1-405 S on 4 m. with 5-in, refr.
1829°43 132°o I I'464 2 on I I n. &
1830°o4. I 23'2O 1:41 o H on 2 n. with 5-in. refr.
1832. Io I 33°43 1.351 DA on 3 m. with 3.8-in, refr.
1833'22 1329 I ‘4. SM
1840-18 I 34°o'7 DA on 1 m. with Mr. Bishop's 7-in. refr.
1850-26 I 33'9 1:23 o X on 3 n. with 15-in. refr. at Pulkowa.
1851-19 138-17 I'5oo M on 2 n.
1852:23 14o'81 I'644 M on 2 n.
1853'22 I 38°33 1'47.5 J on 2 m. at Madras.
It seems probable that the large discrepancies in some of the observed angles arise princi-
pally from the oblique position of these stars, the differences being far greater than can be
attributed merely to the closeness of the stars. On the other hand, the near agreement of the
results by SouTH, STRUvE, SMYTH, and myself, both in position and distance, is remarkable.
On the whole there seems to be but slight ground for inferring any change of a binary
character.
No. 1122 = O > 179 = 2 Geminorum.
The discovery of this extremely delicate object was first made by Sir JoBN HERSCHEL with
his 20-foot reflector. (It is No. 427 of his Second Series.) It was also detected by Mr. OTTo
STRUVE, who has lately furnished me with his measures of it for comparison with my own,
which gives no reason to suspect any relative motion.
1832: 17 P = 22#17 D = 6.254 DA on 1 m. with 3.8-in refr. by Dollond.
1838.98 23 I-9 6'o SM “A 4, orange; B Io, pale blue.”
1841-20 232’67 6, 183 DA on 1 n. with Mr. Bishop's 7-in. refr. “A
43-in. yellow; B Io, pale blue.”
I 844'27 23 I'77 6:26o O > on three n. “A = 4; B = 8-9.”
1846'24 23 I* I o 5-238 M on I n.
1856-59 2.34°43 6:26o O > on 3 n.
The position-angle obtained by me with the 5-foot refractor in 1832 is doubtful; yet the
distance, which is the result of Io measures, proves that the Small star was sufficiently well
seen ; and in the note to the observation it is recorded that it bore a very tolerable illumina-
tion. Sir JoHN HERSCHEL has called it a 14th magnitude, which agrees theoretically with
the 1 oth of STRUVE's scale.
Micrometrical Measurements of Double Stars. 337
No. 1123 = 2 1174 = H I. I 1 = Cancri 17 (B).
This star is probably unchanged since it was discovered in 1782 by H (who mistook it for
1 1 Cancrè); though the results by different observers vary more than might be expected in so
easy an object. -
1782:28 F = 35; 17 D = ".. H “with 460, about 1; diameter of L.”
I 822 I 2 354°50 4:498 H and S. on I n. -
1828-27 354'75 3’512 2 on 4 m.
1832.76 354'2 3-8 SM - - i
184o'I 2 351'46 3760 DA on 3 n, with Mr. Bishop's 7-in. refr.
I 842-33 353'54 3:472 M on 3 n.
185 I: 14 352-69 3.81 1 M on 5 m,
1854: I I 351'38 3'418 DA on I n. with 63-in, refr.
No. 1 128 = X 1186 = 1 I Cancri.
The large discrepancies in the measures of this star, discovered by STRUVE, may well arise
from the faintness of the small star and its moderate distance from the larger one,
O //
1828-26 P = 218.84 D = 3' 176 X on 5 n.
1839'70 2 I 3’5 3'2 SM
184o 12 2 I I'50 3.275 DA on 1 m. with Mr. Bishop's 7-in, refr.
1846'o I 219.87 3'497 M on 4 n.
1851-20 223-27 2:990 M on 2 m.
No. 1129 = X 1196 = H I. 24 = . Cancri, A B.
The binary character of this interesting object is satisfactorily established, considerably more
than a complete revolution having been performed since its first discovery by HERSCHEL in
1781. It has been carefully measured since 1825 by many different observers, among whom
there is on the whole a very fair agreement, considering the closeness of the stars. My own
observations of it are as follows:—
1831:30 P = 3ó77 D = *ogs DA on 3 m. with 3.8-in. refr.
1832-12 27°oo ... DA on 7 n. with same.
1833'2 I 26.23 1-191 DA on 9 m. with same.
1836.68 I6' 12 ... DA on 4 m. with same.
184ozo 4:36 1, 188 DA on 8 m. with Mr. Bishop's 7-in, refr.
1841-16 o:87 1' 177 DA on 5 m. with same.
1842'22 356-26 I 182 DA on 6 n. with same.
ROYAL ASTRON. SoC, VOL. XXXV. xx
338 Rev. W. R. DAWEs, Catalogue of
J/
1843' 18 P = 35.5%; D = 1 . I 19 DA on 8 n. the same and Pr. Cr. M.
1848' 13 338'50 I'o49 DA on 1 n, with 63-in. refr. and Sph. Cr. M.
1848'24. 338: 12 1'o61 DA on 6 m. with same and P. W. M.
1849°29 334°2 I I I I I DA on 5 m. same instruments. -
1851-25 327-90 I'o Io DA on 7 n. Same instruments.
1852:23 324'44 . 1'o67 DA on 3 m. same instruments.
1854°2O 3 I 5"3 I o'977 DA on 3 n., on 2 with 74-in, refr. by Alvan Clark.
In the 229 years included in these epochs the mean annual motion is — 3°3; but the
motion has decidedly accelerated within the last ten years, and the distance has, I think, cer-
tainly diminished. For comparison with the above results I have selected the following from
the best observers at about the same epochs:— -
1831. 16 P = 31%.7 D = *34 H on 5 n.
1831-28 29'8o I'o.48 X on 6 n.
1832'23 28'3 I'3 SM
1832:28 27°52 I'I 5o 2 on 4 n.
1833"I 3 26-26 ... H on 9 n.
i833°27 22* I O I 147 2 on 3 n.
1836-27 I 5' 37 I 197 X on 3 n.
1837. I 1 I 2.8 I "2 SM
1839'32 5'2 I '3 SM
1841-31 1'o6 I'ojo M on 6 n.
1842'26 358'52 I'o'o M on 6 n.
1843 II 35 5' I I 2 SM
1851-18 333'50 F on 3 m. with 44-in. refr.
1852-16 329 oz ... F on 2 n. with 4-in, refr.
1852-25 325'8 I 1'o64 M on 6 m.
1853'2O 322°O4. I'22 J on 3 m. with 6'3-in. refr.
1853'25 3.24°75 I'o; 5 M on 8 m.
1853'30 321'o6 F on 2 n.
1853-95 3 I 7°24 I’ I 5 J on 2 n.
1854:27 318:67 I'o'77 M on 1 on. (D on 8).
No. 1183 = H III. 197 = & Cancri, A. C.
The distant member of this interesting triple star has evidently an orbital motion in the
same direction as the close pair, but incomparably slower. Its period is probably between 600
and 7oo years.
The principal epochs of observation by different observers are the following:—
Micrometrical Measurements of Double Stars.
339
1781.89 P = 181%3. D = 8046 H
I 8oz. I I 171-78 - ... H - . . -
1821'o'7 16o'o2 5’714 2 with the smaller instruments at Dorpat.
1822, 14 I 57:28 6241 H and S on 1 n.
1825-27 I 57°92 5'436 S on 3 m. with 5-in. refr.
1827.60 I 53°o2 5:306 X on 6 n. -
1831:30 I 50:28 5'59 DA on I m. with 3.8-in. refr.
1832-18 148.85 5'59 DA on 4 n. -
1832:28 14826 5'464 2 on 13 n.
1832.87 I 47' Io 5:44 DA on I n, with 3.8-in, refr.
1835-31 I 45°44. 5'318 X on 5 n.
1836-27 I 44' I 3 5°233 > on 3 m. . . -
1836'90 14792 5'ol SM (Mean of 6 sets, 1832–43.)
1841 -o/ I45'58 4:968 DA on 6 m. with 7-in, refr. at S. V.
1842'20 146’25 4,680 M on 5 n.
I 843'22 146-69 4:946 DA on 2 n. with same and Pr. Cr. M.
1848 I 4 146'33 4.88o DA with 63-in refr. and Sph. Cr. M.
1852-o8 146'52 5.205 MI (P by 16 obs.; D by 32).
1852:25 I4 I'72 4'994 M on 6 n.
I 852'49 143°68 4.842 F on 3 n.
I 853'25 141-ol 4,769 M on 7 n.
1854'o'7 I4O'47 5'o.49 DA on I n.
1854'27 142 II 5'o; 1 M on Ion. (D on 8).
Though the measures of distance are rather conflicting, it seems probable that some diminu-
tion has taken place and is still proceeding. - -
No. 1194 = > 1202 = P VIII. 13.
STRUVE's measures of this star, discovered by himself, rendered angular motion highly
probable, as he has intimated. A subsequent set seemed to negative the supposition. The
obliquity of direction may partly account for the discrepancies in the results obtained by differ-
ent observers; but if the whole of the difference, amounting to nearly 12°, is attributable to
that cause, it will furnish one of the most remarkable instances of the influence of that fruitful
source of error. The following results have been recorded:— -
1827-19 P = 34% - D = #37 2 on I m.
1830'22 335'4 2:20 X on I n.
1831°23 3.32°2 2'5o 2 on I m.
1832'27 338°o 2'5. SM
1836-19 337°4. 2:28 X on I n.
Rev. W. R.
DAWEs, Catalogue of
1844.21 P = 3 33.65 D = 2578 M on 2 n.
1848-3 I 332'27 2-363 M on 3 n.
1848°24 328'57 2.2 19 DA on I n.
1851-22 332°og 2:276 M on 2 n.
1852'27 329°27 M on 2 n.
2°529
No. 1195 = > 1223 = H II. 40 = p, Cancri.
No change seems to have occurred in this fine object since it was discovered by H in 1782,
1/
as appears from the following selection of epochs:– - .
1782°og P = 2 I 3:30 D = H “With 460, 23-diameters of L.”
1822'48 211'22 5'514 H and S on 4 n.
1829.45 2 I 2"O4. 4:563 X on 7 m.
1833:25 212.5 4.8 SM
1838-34 214:30 4.825 X on 3 n.
1840' I 5. 212° 58 4:946 DA on I n. with Mr. Bishop's 7-in. refr.
1841-29 214.66 4:957 M on 4 n.
I 854'I 3 214' 35 4.637 DA on 2 m. with 63-in, refr.
1854.46 2 I 5'35 4,898 DE on 7 m. with 53-in. dialytic refr.
No. 1198 = X 1224 = H II. 41 = v Cancrº.
A comparison of the measures of H and S in 1822, with that recorded by H in 1783,
seemed to show a change of angle to the amount of 20°; which, however, has not been at
all supported by subsequent observations. The following are a few of the principal epochs:—
1783'o'7 P = 5%.1; D = #; + H “With 460, 4 diam. of L.”
I 822' I 2 37-78 - 6:046 H and S on 1 m.
1830.76 37:27 5.838 X on 9 n.
1835'3 I 38:70 5'88 X on 2 n.
1837.26 38-6 57 SM .
1840'24. 38°50 5°91 > on 3 m. with 15-in, refr. at Pulkowa.
1840-88 38:28 6-238 DA on 4 m. with Mr. Bishop's 7-in, refr.
1842-32 39'55 5°925 M on 2 n.
1843' 17 3976 5-869 DA on 2 m. with 7-in refr. and Pr. Ct.M. at S. V.
1843' 18 4Q' I 5.8 SM
1849' 54 39'89 6'o64. DA on 4 m. with 63-in. refr, and P. W. M.
1850' 30 37' I 5-67 O > on 2 m. with 1 5-in. refr.
1851’ I 5 4 o'22 5'734 M on 5 m. 3.
I 852-95 40° 17 5'947 M on 5 m. -
1854'89 4 o'O4. 5'808 DE on 5 n, with 53-in. dialytic refr.
Micrometrical Measurements of Double Stars. 34. I
No. 1208 = 2, 1263.
The great proper motion of the larger star, and the comparative fixity of the smaller,
are well established by the observations which have been made since this remarkable double
star was discovered by STRUVE. The following are a few of the epochs of observation by
various observers.
In the introduction to the first
1828-36
1829-36
I 835' 35
1840-27
1841 ° 33
I 845'3 I
1850-62
1852. I 5
1853' 19
I 854'I 3
O .
E’ = 359'o
4'I 2
9°29
I 2'42
I 3'22
I4-85
15-88
16.67
17:12
17 Io
D = 4.86
5' 4-3
9° 595.
I 2-880
14:28o
16:660
zozzo
20:840
21°217
22°474
X on I n.
2 on 2 n.
2 on 4 n.
2 on 4 n.
DA on I n.
2 on 2 n.
> on 3 n.
F on 3 m.
F on 3 m.
DA on 2 n.
No. 121 1 => 1273 = a Hydra.
series of my measures of double stars at Ormskirk,
(Mem. R. A. S. vol. viii. p. 67) I
On the arrival
it appeared that he had come to the
own observations.
Same conclusion.
announced the binary character of this star from my
of STRUVE's great work, the Mensuraº Micrometrica,
I suspected that a diminution of dis-
tance accompanied the increase of angle, which is only partially supported by my subse-
quent observations; and arose in part no doubt from the fact, which I have before pointed
out, that my earlier distances were frequently too large.
The star has been well attended
to, and the following selection of results will suffice to show its binary character.
1825°23 P = 1934o
1831 13 I 95°27
183 I-29 I95'97
1832:20 19760
1834°oo 199’ I 7
1835'28 19837
1836-27 198.60
1837. I I 198°4.
1837'23 197'90
I 839°23 I99' I
//
D = 3'3 Io
4’34
3' I 4o
4-26
3.65
3' 167
3'2O3
3'4.
3'5
3'390
2 on 3 n.
DA on I n. with 3.8-inch refr. “sadly unsteady
and ill defined.”
2 on 3 n.
DA on 2 n.
DA on I n.
X on 3 n.
2 on 3 n.
DA on 1 n.
SM
1840'30 2Oo'8o
2 on 2 n.
342 . Rev. W. R. DAWEs, Catalogue of
184O'95 P = zoï. 59 D = 3’soA DA on 16 n. (D on 11) with Mr. Bishop's 7-in, refr.
1843' 14 2O3°2 3-6 SM §
1843'2 I 2O3°48 3.426 DA on 3 m. with 7-in, refr, and Pr. Cr. M. at S.V.
1848: 14 205.75 3:428 DA on 1 m. with 63-in. refr. and Sph. Cr. M.
1848.79 20420 3.1oo O > on 2 m. with 15-in, refr. at Pulkowa,
1848.83 206'72 3.506 DA on 3 m.
1851:32 20848 3'435 DA on I n.
1852' 30 209" Io 3.377 M on 4 n.
1852.96 208-52 3.578 F on 4 n.
1853'24. 209" I 2 3'330 J on 2 n.
1854°oo
209:63
3.265 J on 2 n.
No. 123; = x 1282 = Lyncis 130 (B).
One of STRUVE’s discoveries. No change seems to have occurred since the first obser-
vations.
P = 27747 D = 34oo 2 on 4 n.
277-82 3'394 DA on I n, with 63-in. refr.
1830'o6
I 854°og
No. 1237 = O > 195 = P VIII. 200.
There is no evidence of change in this star since the observations of its discoverer who
kindly communicated them to me by letter. - -
1845.77 . P = 139%; D = 9.460 O X on 4 n.
1851°39 138'03 9'512 DA on 4 n.
No. 1241 = 2 1306 = H III. 54 = 0, Ursae Majoris.
A slow variation both in angle and distance is pretty certain in this star, as was pointed
out by STRUVE, from comparison of his own with HERSCHEL's measures; and subsequent
observations confirm the change in both elements.
1782:42 P = 283% D = 793 H
1831 “4o 264:35 4,615 2 on 2 n.
1832.87 262.75 - 4555 > on 2 n.
1838-41 262°oo 4:460 X on 6 n.
Micrometrical Measurements of Double Stars. 343
1841' 20
1846.38
1851.28
1851.39
I 854-84
P = 262%3
261'70
258.21
256'5o
256'oo
D = #466
4°o 5o
3'925
3'70o
DA on 2 m. with Mr. Bishop's 7-in, refr.
O > on I n. with 15-in, refr.
DA on 2 m. with 63-in. refr.
O X on, I n.
3:478 DA on 1 m. with 7-in. refr. by Al. Clark.
No. 1246 = X 1311 = H III. 92 = Cancri 194 (B).
The close agreement of the more recent measures of this star renders it probable that the
larger angle of HERSCHEL, who discovered its duplicity in 1783, is erroneous to the extent
of about + 4°. - -
1783-13 P = 204.80 D = 8.83 H
1823-19 201:38 7:640 H and S on 2 n.
1831 31 2Oo'5o 7'2O2 X on 5 n. .
1841 "3 I 2Oo'74 7'497 M on 2 n.
1841-86 200-67 7' 516 DA on 5 m. with Mr. Bishop's 7-in. refr.
I 843'2 I 201'o6 7' 164 DA on 3 m. with same, and Pr. Cr. M.
1854. I2 2Oo'81 7:270 DA on 2 n. with 63-in. refr.
No. 1256 = O > 197.
Mr. OTTO STRUVE having communicated to me . his measures of this star, I am able to
offer a comparison of our results:—
D = 1428 O > on 4 m. with 15-in, refr.
I'204 DA on 2 n. with 63-in. refr.
P = ;%28
56-97
1846'99
I 849' 5 I
No. 1258 = X 1321.
A comparison of the observations shows a continued increase of angle and diminution of
distance, noticed by STRUVE in 1835. -
182O'92 P = 43 % D = " > with the smaller instruments at Dorpat.
1822'o'7 tº º 2 I " I 2 > with the same,
1824'25 45'78 ... S on 3 n.
1824'67 . . . 20:796 S on 2 n.
183 I 35 48: 12 20:140 2 on 3 m.
1835-38 48'95 2O'o.4o 2 on 2 n.
184 I 54 50-61 zo:314 DA on 4 m. with Mr. Bishop's 7-in. refr.
1848' 29 5 I '83 19'874. DA on I n. with 63-in. refr. 4.
1852'42 53°o I 19-235 M on 2 n.
344 Rev. W. R. DAWEs, Catalogue of
No. 1263 = 3 1338 = Lyncis 157 (B).
Since the first measures of this star by STRUVE, who discovered its duplicity, the increase
of angle suspected by him in 1833, has become very certain, while the distance appears to
have scarcely varied. -
1829.53 P = 121°14 D = #762 2 on 5 n.
1841°23 I 25'90 :1754. DA on 3 m. with Mr. Bishop's 7-in, refr.
1842°23 I27'33 1723 DA on 3 n. with same,
1843' 17 127:78 1.665 DA on I n. with same, and Pr. Cr, M.
1848-17 13 I-82 1.666 DA on 3 m. with 63-in. refr.
1850: 12 . 13 I'97 I-696 DA on 2 n. with same.
1851 ‘O4 I 32'74. - 1-803 M on 2 n.
1852.78 I 34'83 1799 M on 5 n,
1854°29 134-64 1.650 DA on 5 n.
No. 1280 = O > 200.
The difference between my measures and those of the discoverer of this elegant double
star, is probably owing to error of observation. It may, however, be desirable to place it
upon the list of stars to be re-examined. . .
1846'04 P = 33 *zo D = #442 O X on 4 n.
1848-28 338°52 I 564 DA on 1 m.
No. 1281 => 1355.
One of STRUVE's discoveries in which there may possibly be some diminution of the
angle and very probably in the distance. The star is worthy of further observation.
1831 "I 3 P = 329 as D = #19 DA on 1 m. with 3’8-in. refr.
1832°20 328-3o 2-837 X on 3 n.
1852.63 326-28 2.666 DA on 2 n. with 63-in. refr.
No. 1283 = X 1356 = H I. 26 = a Leonis.
One of the most remarkable double stars discovered by H, whose observations separated
by an interval of 11’ 12 years showed a variation of + zo” in the angle, attended by a con-
siderable increase of distance. The star has not been neglected since STRUVE began his
Micrometrical Measurements of Double Stars. 345
Aº
measures in 1825, though the extreme difficulty of the observations has caused large dis-
crepancies among them. South's observation in 1826, though the result happens nearly
to agree with STRUVF's about the same time, is no doubt illusory, as he states the magnitudes
of the components to be six and nine, the small star being “pale blue; ” whereas they differ
but little in magnitude, and are both yellow,-the smaller being, according to STRUVE, cer-
tainly of the deeper colour. This star is one of those in which a binary character and short
period are unquestionable. -
1783.26 P = I logo D = " H “With 460, # diameter of S emerged.”
1804'og 130-88 gº º H
1825' 21 I 53'94. o°970 2 on 5 n.
1832-25 163:40 o'515 2 on 2 m.
I 833 29 172.8o o°447 2 on 3 n.
1835°34 I73°9 tº e > on I n. “A red wedge.”
1836-28 3587 o:35 est. X on 3 n. “Oblong.”
1838.33 18o'o W and O Struve; a mean of their mea-
sures. “A little oblong.”
1839°33 355°o SM “elongated.” -
1841. 18 354'48 tº º DA on 1 n., with Mr. Bishop's 7-in, refr.
1852' 30 35O'o; o°475 M on 4 n. -
1853-18 34-3'34. o'45 est. J on 2 n. with 6'3-in. refr.
1853'36 346'51 o' 35 M on 7 n.
1853-96 35 o'O3 O'4. est. J on 2 n.
I 854'23 346:23 o'546 DA on 2 n. with 73-in. refr. by A. Clark.
No. 1288 = 2 1365 = Hydrae 134 (B).
Though STRUVE thought in 1835 that this star, discovered by himself, had remained
unchanged since his first measures in 1825, yet a small diminution of the angle is shown
by the comparison of his with more recent observations.
1830'oz P = 16232 D = 3'o62 X on 4 m. in four different years.
1842'29 161'58 3-5 14 M on 2 n.
1848.25 I 59°45 3'290 DA on 2 n.
I 85 I'93 16089 3°719 M on 3 n.
MÄDLER's results would seem to show an increase of distance; for if otherwise the errors
of observation must be unusually large.
No. 1290 = O > 208 = p Ursae Majoris.
This star seems to be subject to a slow increase of the angle according to MXDLER's
measures, which are the only,ones I am acquainted with besides my own.
ROYAL ASTRON. SOC. WOL. XXXV. Y Y
346 Rev. W. R. DAWEs, Catalogue of
1846 or P = 1938; D = Gºa; M on 3 n.
1847°41 19678 O'3 M on 2 m.
1851°39 207'18 o:31 M on 4 n.
1852°40 209-77 o'245 M on 4 n.
1854:28 25'89 o'4 est. DA on 1 n, with 74-in, refr. by A. Clark.
I felt quite sure that the star in the n.f quadrant was the smaller. The star cannot,
however, have become single, and then opened out to the extent of o”.4 in so short a period
as two years. But the stars differ little in magnitude, my careful estimation being 5% and 5; ;
while O. STRUVE's is 5 and 5.6.
In a note to this star in the Pulkowa Catalogue of 1850, he says, “Hitherto the two stars
which compose this system show only a small relative motion.” His observations when pub-
lished will probably throw light on the subject. i
[Since the above note was written, I have received from Mr. OTTO STRUVE all his measures
of this interesting object, which fully prove that the conclusion drawn respecting its binarity
was correct. I have computed the following mean epochs, combining in each several nights’
results in different years; and have added my own single night's measure for comparison.
1845'38 P = 3.26 D = &425 O > on 8 n. with 15-in. refr. at Pulkowa.
1852: 12 I6' 16 o:34o O > on I I n. with same.
1854:28 25.89 o'4 est. DA on I n. with 7%-in. refr.
1858-8o 36.86 o:38o O > on 5 m. with 1 5-in. refr.
1863.21 48'o6 o:334 O > on 5 m. with same.]
No. 1291 = A. C. 5 = 8 Seartantis.
This close double star, discovered by Mr. ALVAN CLARK with one of his earliest object-
glasses of only 43-in. aperture, could hardly have been as obviously double at the period of
STRUVE's Dorpat examination of this region as it is now. I am unaware of any other
measures of it than my own, and these are only in one year, but I have a strong impression
that it will prove to be a binary. At all events, it is well worthy of being reobserved.
No. 1293 = 2, 1399.
This was one of the stars measured by Mr. OTTO STRUVE and myself for comparison of my
results with his own and his father's. They are as follows:—
1828%6 P = 175°o? D = 3 o' 142 > on 4 n.
184o'32 174-82 3o'37 O 2 on 4 m.
1848-82 174:60 30-30 O > on 2 n.
1851'29 175°ol 29'97 DA on I n.
1852'oo I 74' 50 3o46 O 2 on I n.
Micrometrical Measurements of Double Stars. 347
No. 1295 = O > 213.
Mr. OTTO STRUVE having kindly communicated to me his measures of this double star,
detected by himself, I have the pleasure of placing MÄDLER's and my own in comparison
with them.
1843°78 P = I 1365 D = 6'915 O X on 2 m. with 1 5-in, refr.
1846:30 I 22°54 o'78 M on 1 n.
1849°27 II 7°45 1'o67 DA on 1 m. with 6%-in. refr.
1851' 33 I 18.78 I I 18 M on I n.
1854'57 115°oo 1' 105 O > on 2 n.
No. 1296 = O > 523 = 39 Leonis.
Small as is the companion in this case, a physical connection seems to be established by
the fact that it partakes of the proper motion of the larger star, as is shown by STRUVE in the
Introduction to Pos. Med. p. ccxxii. - -
1850:30 P = 295.8 D = 66. O X on 1 m.
1851°29 - 293'3 6.65 O X on I n.
1852: 18 294°8 6'90 O X on I n.
1854:28 295'5.5 6 -- est. DA on 1 m. with 7%-in. refr. by A. Clark.
There is probably a variation in the light of the small star. In the Pulkowa Catalogue
of 1850, O. STRUVE remarks that in 1842, though this star was examined on four different
nights in a favourable state of the sky, the companion was not seen; while in 1850 it was
seen without difficulty even in a less favourable sky. At that epoch he estimated the mag-
nitude to be Io; in the Pos, Med. above quoted, it is noted as I I-8; and I have carefully
estimated it as I I.
[Since the above Note was written I have received from Mr. OTTO STRUVE his further
measures of this difficult and rather extraordinary object, of which the following are the
calculated mean results at two epochs. - - ..
1851-26 P = 295.65 D = 6,712 O X on 4 m.
1861'24. 297-85 6'945 O 2 on 2 m.
The estimated magnitude of the small star varies from Io. I I to 12.13.].
! No. 1297 = > I424 = H I. 28 = y Leonis.
One of the most splendid double stars in the heavens, and peculiarly interesting from its
well-ascertained binary character, which was noticed by H (the original discoverer of its
duplicity) during his review of his double-star catalogues in 1800–1803; the smaller star
348 Rev. W. R. Dawes, catalogue of
having changed from the north to the south side of the parallel, since his first observations,
of it in 1782. But one of the most extraordinary circumstances connected with this star is
the great difference between H's description of the colours of the components, and those
which, by a close agreement of all observers, they now present. HERSCHEL assigns the colours
as follows: “Large star, white; small star, white, inclining a little to pale red.” H and S
describe them as “both reddish.” STRUVE says, “Major, aurea ; minor, rubroviridis.”
SMYTH calls “A, bright orange ; B, greenish yellow.” My own judgment has varied on
different nights, even with the same telescope; and it appears that I have designated A, as
orange, golden, reddish yellow, yellow, deep yellow; and B, as orange, yellow, paler yellow
(than A), purplish yellow, reddish yellow, and greenish yellow. DEMBowsRI calls “A, jaune
parfait; B, or-olivátre.” As might be expected, this fine and easy object has attracted
great attention among astrometers, and the following are selected from their numerous
observations: -
1782-71 P = 83 so D = " .. H “With 460, 4 diameter of S.”
1801.72 94'70 . © . H
1822-24 98’40 3.243 H and S, on 3 m.
1825'30 Io I°28 2.716 S on 6 n.
1828-14 nozºo 3 2.458 2 on 6 n.
1830:28 1 oz. 38 3°o3 H on 6 n. (D on 2).
1830-39 Io I '82 2:545 DA on 3 n. with 3.8-in. refr.
1831°33 102.87 2°526 DA on 5 m. with same.
1831 34. 103'26 2'484. 2 on 5 n. -
1831-36 Io9'2 2-6 SM
1832-31 Ioz'98 2.647 DA on 8 n.
1832.75 Io3:46 2'504 2 on 5 m.
1833-18 103.68 2’642 DA on 3 m.
1833'22 IO4'25 2.65 H on I n. “Perfect definition.”
1835-16 104.94 2:562 X on 5 n. .
1836'42 IO4'9 2' 5 SM
1839'23 106°o 2.6 SM
184o'29 Io;'82 2.838 DA on 3 n. with Mr. Bishop's 7-in. refr.
1840-83 IoS’7 2.78 O > on Ion. with 1 5-in. refr. at Pulkowa.
1841 °23 106°21 2.832 DA on 2 n. with 7-in. refr. at S V.
1841-26 105'o3 2.785 M on 8 n.
1842°23 Io 5'95 2.776 M on 4 n. -
I842-33 106'56 2.719 DA on 2 n. with Mr. Bishop's 7-in. refr.
1843-18 Io'7.2 2.8 SM
1843'26 I of '39 2.850 DA on 2 m. with 7-in, refr. & Pr. Cr.M. at S.V.
1846-27 107.15 2784 M on 5 n. * .
1847:28 Io'ſ '82 2.8oz DA on 2 n. with 63-in. refr.
I 848.39 I of '73 2.646 M on Io n.
1848-46 Io9' 15 2.824 DA on 5 m.
Micrometrical Measurements of Double Stars. 349
1850'91
1851.28
1851.87
1853'21
1853'22
1853-82
1853'96
1854'37
1854'48
185476
Io8'o6
108-76
I ob'43
Ioy'8o
Io8'90
Io9'35
Io976
Io'ſ '94.
108-87
O M/
P = Io8'07 D = 2,839
2°742
2.807
3"Oo3
2'91
2.813
3'o'7
2.846
2.786
2'974.
F on 4 m. with 44-in- refr.
M on 8 m.
DA on 2 n.
F on 5 n.
J on 2 n. (Erroneously given in Mean Results as 107°37).
M on 3 n. -
J on 2 n.
DA on 3 m.
M on 16 n.
DE on I I n.
No. 1320 = 2 1426 = Leonis 145 B.
As a double star this is H II. 43 ; but STRUVE, in measuring it with the Dorpat telescope,
discovered that the larger star was itself very close double.
The measures at different epochs
scarcely decide the question of relative motion in the close pair; the discordances being rather
unusually large even for so difficult an object.
pair.
1832°26
1836-28
1842:25
1842°30
1854; 16
O
P = 256-77
267.2
262'o;
257'71
263:28
D = o:6
O-8
o' 5
o:7
O'8
2O 2 on 3 n.
2 on I n.
5 M on 3 m.
3 est. DA on 3 m. with Mr. Bishop's 7-in. refr.
85 DA on I n. with 63-in. refr.
*** & C = H II. 43.
There seems to be no doubt of the fixity of the small distant star with respect to the close
1782. 13
182 I 1 I
1823" I4.
1832° 22
1842'24.
1842'27
1854; 16
O
P = 4.97
9“I 5
9°75
9' Io
8'57
9°25
9°39
M/
D =
7:08.1
6-723
7'43o
7'714
7:632
No
The measures by different observers give:–
Hi D est. = 2% diam. of L between the disks with 227.
X D from difference of declination = 6'99.
H and S on I n.
2 on 3 n.
M on 3 n.
DA on I n with Mr. Bishop's 7-in. refr.
DA on I n. with 63-in. refr.
. I326 = 2, 1429.
A close double star discovered by STRUve. Though rather difficult, there seems to be
Some ground to suspect a diminution both of the angle and distance, since the earliest measures
at Dorpat.
35O - Rev. W. R. DAWEs, Catalogue of
1827-29 P = 272%o D = 1485 2 on 2 n.
1833°26 267.4 1.58 2 on 1 n.
1849.76 265-78 I'373 DA on I n.
No. 1329 = O > 220.
By the kindness of the discoverer of this double star I am enabled to give his results
obtained with the Pulkowa refractor.
1845'55 P = 58%2 D = 1%08 O X on 4 n.
1846:30 61.96 I'327 M on I n. *...
1849'27 57' I 3 I'370 DA on I n.
1851.28 59'26 I'360 M on I n.
No. 1331 => 1442.
Unchanged since the first measures of STRUVE, its discoverer.
O
1831. Io P = I 55.22 D = 13°335 X on 6 n.
1831-19 155.57 13-618 DA on 2 n. (P on 1 only), with 3.8-in, refr.
1850'22 154-65 13°307 DA on 2 n. with 63-in. refr.
No. 1333 = 2, 1450 = 49 Leonis. .
If the angle of position of this star has not varied since it was discovered and measured by
STRUVE at Dorpat, it forms one of the most remarkable instances of personal difference in
the measures of position. STRUVE's measures are so nearly identical during the ten years
embraced by the Dorpat observations as to throw much doubt on what would otherwise
seem to be a pretty certain change.
O //
1825-26 P = 161°o 5 D = 2:435 2 on 2 n.
1831.70 I6 I'8o 2'25o 2 on 2 n.
1835' 3 I 16o'5o 2.490 2 on 2 n.
1838-37 158. I 2°5 SM
184o'32 I 55°52 2° 552 DA on 1 n, with Mr. Bishop's 7-in. refr.
1842:29 I 58'91 2'590 M on 4 n.
1851-26 I 58°39 2*73 I M on 2 n.
1852°og I 59°oo, 2-970 > on 2 n. “Distantia incertior est.”
1852.26 158.63 2747 M on 1 m.
1854:28 I 55"33 2'604 DA on 1 m. with 7}-in. refr.
Micrometrical Measurements of Double Stars. 35 I
No. 1335 = 2, 1457.
Discovered by STRUVE. There seems little doubt of its binary character, both angle and
distance having decidedly increased. Measures of this star are given at page 3 of the
Mens. Microm., and also at page 13. In the latter the measures obtained in 1825 are
omitted. As in these the distance is only estimated, I have adopted the mean as given at
page I 3.
1829'55 P = 28%.85 D = &#12 2 on 4 m.
I 842-24 3O4'93 o:690 M on 5 m.
1846'30 3o 5'97 o°666 M on I n.
1850.78 3O2°75 O'925 DA on 2 n. with 64-in. refr.
1851.27 312'46 o'84o M on 3 n.
1852:29 3 II ‘24. O'992 M on 4 m.
1853'29 gº tº O'972 M on 2 n.
I 853° 34 31 o' 18 tº M on 4 n.
This object seems worthy of continued and very careful attention.
No. 1337 = X 1466 = H N. 36 = 35 Seartantis.
This elegant object, of which the larger star is yellow and the smaller blue, was discovered
to be double by H. The evidence of change is but slight, and applies only to a small decrease
in the distance.
1822-33 P = 237°57 D = #869 H and S on 2 n.
1830-2 I 239°92 7'496 H on 2 n.
1831-21 24O'43 6'926 DA on 2 n. (D. on 1 n.).
1832-82 24 o'47 6-717 X on 4 m.
1834-27 24O' I 6'9 SM
1839' 19 239'6 6-8 SM
1841'57 239°9 I 6.752 DA on 6 m. with Mr. B.'s 7-in. refr. and P.W.M.
1843°24 239°35 6-698 DA on 4 n. with same, and Pr. Cr. M.
1848 I 4. 239.87 6'874. DA on 1 n. with 63-in. refr. and Sph. Cr. M.
1852'99 24 o’23 6'564
DA on 3 m. with same, and P.W. M.
No. 1351 = O > 229.
I am permitted by the kindness of M. OTTO STRUVE, the discoverer of this very pretty
object, to append his results for comparison with my own.
D = 6694
O'925
O 2 on 5 m. with 15-in. refr.
DA on 1 m. with 64-in, refr.
O
P = 345-64
347°35
1846'55
1849' 17
352
Rev. W. R. DAWES, Catalogue of
.
-*:
*
:
No. 1353 = 2, 1487 = H III. 30 = 54 Leonis.
Though the angle of position of these stars has been considered to be probably unchanged
since it was first discovered by H in 1782, yet the difference of 5° is more than might be
expected to occur from errors of observation, to which cause, however, the apparent decrease
in the distance may safely be attributed.
1782. 12
.18oz. Io
I 82 I-68
1830'35
1832°26
1839°33
1840'30
1846-48
1848:22
1852'o'7
O
P = 99'23
Ioo’65
98.32
102.8o
Ioz'5
Io2.7
Io9'84
104.38
Io9'77
103-89
D = %io
7:023
6-175
6'5
6-2
6:221
-- 6,206
6:305
H
H
H and S on 2 n.
2 on 4 m.
SM
SM
DA on 2 n. at Mr. Bishop's Observatory.
HI on 2 m. at Same.
DA on 2 m. with 64-in. refr.
DA on 2 n. with same.
No. 1359 = 2, 1500.
A very close object, discovered by STRUVE, whose measures pointed to a diminution of the
angle, subsequently in some degree confirmed.
1825-22
1832°o9
1841-20
I842'24.
See Note on this star in the Appendix.
- O
P = 33 o'90
32 I'47
317 Io
322'87
D = foã9
o'967
o'909
1'o65
2 on 2 n.
2 on 4 m.
DA on 1 m. with 73-in. refr. at S. V.
M on 3 m. -
No. 1360 = X 1517 = P XI. 9.
The difficulty attending the measures of this pretty object, discovered by STRUVE, is
probably the cause of the differences among the results. STRUVE suspects the relative
brightness of the components to be variable.
1829.7o
I 83 o'24.
1831. 18
1833'3 I
1836.36
184o 3o
1845'3 I
1854°27
O
P = 287-8o
288°oo
283'16
288-6
289°47
288-92
282-7
283.62
//
D = 1°o;2
I 19
o°8 I
I "2
I 147
I'o89
o'92
o'912
2 on 5 n.
H on 1 n.
H on 2 n.
SM
2 on 3 m.
DA on 1 m. with Mr. Bishop's 7-in. refr.
O > on 2 n. with 1 5-in. refr.
DA on I n, with 73-in. refr. by A. Clark.
Micrometrical Measurements of Double Stars. 353
No. 1362 = 2 1521.
Probably unchanged since STRUVE discovered it.
1824-22 P = 95%z D = 4. o: S on 2 n. (In Phil. Trans. 1826, pt. 1, p. 169,
- • for n.f read s..f.)
1829-32 95°2O 3-663 X on 3 m.
1830-17 94'50 2-84 H on 1 n. (Qy for 2"-84, read 3"-84?)
1831'o'7 93°40 3°74 H on I n.
1831-18 93.18 3-847 DA on 1 n.
1848'24. 93°93 DA on I n.
3-699
No. 1363 = 2 1523 = H I. 2 = 4 Ursae Majoris.
One of the most interesting of the binary stars, and especially so as being the first for
which an orbit was calculated. This was accomplished by M. SAVARY, and the results
published in the Connaissance des Temps for 1830. The period is about 61 years; and the
perihelion occurred in 1816, when the apparent distance was probably about 1". 5. The
measures of this star by various observers are very numerous; and at the period when the
position of the stars was very oblique to the meridian (from angle of position 150° to 125°),
the discrepancies among the results by different observers will be seen to be very considerable
for a star whose distance was 23" or more; affording strong evidence in favour of the
employment of some method of correcting the judgment in such cases.
selection from the numerous epochs of observation.
Subjoined is a
A/
1781-97 P = 143°78 D = H. “With 278, near 13 diameter of L.”
18oz'og 97' 52 H
1804'o8 92-63 e tº H
1825-22 244. 53 2'442 S on 6 n. (D on 4).
1826-20 23875 1747 2 on 3 m.
1827.27 228-27 I ‘7 I 5 X on 4 n.
1829-35 2 I 3'59 I'671 X on 7 n.
1831°o8 2O I 53 I'863 B on 6 n. with the Königsberg heliometer.
183 I-25 2O I " I O I'904 H on 6 n. (D on 4).
I 83 I'34. 2OI '92 1983 DA on 17 n. (D on 4), with 3-8-in. refr.
I83 I-44 203-82 1706 X on 5 n.
1832'27 196'72 1761 DA on 1 on. (D on 8), with 3.8-in. refr.
1832'29 1969 I '9 SM
1832°4. I I95'94 I '75o 2 on 5 n.
I 833°23 189'83 I'98o DA on 4 n.
1833'84 188:42 I '762 X on 5 m.
I 835-37 I 8o'2 I '9 SM
ROYAL ASTRON.
SOC. WOL. XXXV.
Z Z
354
Rev. W. R. DAWEs, Catalogue of
1835'41
1836-28
1836.33
1836'44
1837-28
1837-47
1838-43
1838-48
I839°23
1840'29
1841-21
1841°29
I842'24.
1842'27
1843'16
1843'28
1847'30
1847'34.
1848'13
1848'19
1848:45
1849°30
1850'30
1851° 19
1851 "3 I
1851.78
1852-13
1852:20
I 852°35
1852°38
1853' 19
1853'2O
1853'23
I853'32
1854:36
1854'37
1854-88
O
P = I 8o" 18
#71-37
17o’9
1712o
165'5
165°32
16o:38
1607
1.569
1 5 o'85
I47°97
I 50°2O
146-97
14476
I43°2
I 42° 17
13 I-65
I 3 I ‘43
129'55
I 29°33
I 29' I 3
126'58
I 24'25
I 23' || 3
I 22-93
122°13
I 22°28
I 1977
I2O'86
I 1998
I 18.78
I 19:47
II 8-88
I 18.79
115'87
1 16-37
II 5:O2
D = I %64
**920
I •8
I '972
I '8
I'927
2°26o
2” I
2°o
2°445
2°404
2°442
2'4. II
2°44. I
2°3
2'481
2°579
2°753
2.705
2'938
2-900
3°o 13
3.375
2-828
2'985
3°o24
2.898
2'924
2°752
3'olz
3'olo
2.98o
2.938
2'957
2'894
3*I 97
2 on 5 m.
DA on 1 a,
SM
2 on 4 n,
SM
2 on 3 m.
2 on 9 n.
SM
SM -
DA, P on 6 n. D on 4, with 7-in. refr. at S.V.
DA on 4 n. (D on 3), with same.
M on 7 n. (D on 6).
M on 4 n,
DA on 4 m. with 7-in. refr. at S.V.
SM -
DA on 7 m. with 7-in.refr. and Pr. Cr.M. at S.V.
DA on 1 n. with 63-in. refr. and Sph. Cr.M.
DA on 1 n, with same, and P. W. M.
DA on I n. with same, and Sph. Cr. M.
DA on 3 m. with same, and P. W. M.
W. C. and G.P. Bond on 1 m. with 15-in. refr.
DA on 5 m. with 63-in. refr.
J on 2 n, with 63-in. refr. red. to 4 in.
F on 6 n. with 44-in. refr.
DA on 2 n. with 63-in. refr.
M on 9 n.
MI, P by 56 obs, D by 104.
F on 6 m,
M on 6 n,
DA on I n.
MI, P by 32 obs, D by 64.
J on 2 m. with 6'3-in. refr, by Lerebours.
F on 6 n.
M on 13 n.
DA on 3 n, with 7}-in, refr. by Al, Clark.
M on 14 n. (D on 15).
DE on 12 m. with 53-in. dialytic refr. by Plössl
No. 1402 = 2 1527 = Leonis 339 (B).
The comparison of the subjoined epochs indicates no relative movement in this pretty
object since it was discovered by STRUVE:—
Micrometrical Measurements of Double Stars. 355
I 822°2O P = 9.7 5 D = 3% 3 X with the smaller instruments at Dorpat,
1824'60 Io'33 4'927 S on 3 n.
1829-3o I of 1 5 3.882 > on 4 n.
1840'30 Io.22 3.996 DA on 1 n. with Mr. Bishop's 7-in. refr.
1854'27 I 1'49 3.895 DA on 1 n. with 74-in, refr. by Al. Clark,
No. 1404 = 2, 1536 = 1 Eleonis.
This elegant object was discovered to be double by STRUVE at Dorpat; and his measures -
during eight years point to a probable diminution of angle, though the series is not very
uniform. The distance may probably have slightly increased; and the whole series of
observations of position render the orbital motion indubitable. The following is a selection of
epochs for comparison.
1827-81 P = 9% os D = #29s 2 on 2 n.
1830-62 93°o2 1997 X on 4 n.
I 833'34. 90°47 2.173 > on 3 n.
1834°oo 91.85 2'441 DA on I n, with 3.8-in. refr.
1835°33 90°33 2:407 X on 3 n.
1836-40 90'5 2°4. SM
1837.39 90° 1 2°41 X on I n.
I 839°32 87.7 2'4 SM
184o'29 87.61 2.445 DA on 3 n, with Mr. Bishop's 7-in. refr.
1840-64 89-2 2.29 O > on 4 m. with 15-in. refr.
1841 ‘29 86-78 2.520 DA on 7 n. (D on 4), with 7-in. refr.
1841-32 86.67 2.291 M on 5 n.
1842'22 86-28 2'276 M on 4 n. (D on 2).
1842'27 85'34 2.456 DA on 4 m. with 7-in, refr.
I 842°34. 85'o 2'49 O 2 on I n.
1843'27 85.27 2-631 DA on 4 m. with 7-in, refr. and Pr. Cr.M. at S. V.
1843: 38 86°o 2°5 SM,
1846-31 82°8 I 2-3 12 M on 5 n.
1847°35 8 I-28 2:349 M on 8 n.
1847-36 82.7 2.33 O > on 1 n.
1847.72 83'58 2.478 DA on 2 n. with 63-in. refr.
I 849'29 81: 58 2’641 DA on 2 m. with same.
1851.28 8o'o 5 2'473 M on 4 n.
1851'55 80-67 2’619 DA on 3 n.
1852°38 79°o5 2'418 M on 7 n.
1853'21 79.68 2:44 J on 2 n. With 6'3-in. refr. at Madras,
1853'34. 78-88 2.70.1 M on 8 m.
1854°37 78-85 2-536 M on 6 n.
1854'38 79° 50 2'556 DA on 2 n.
356 Rev. W. R. Dawes, Catalogue of
No. 1431 = X 1543 = H III. 86 = 57 Ursae Majoris.
Considering the distance of these stars, some probability exists of a small decrease in the
angle since it was discovered by H in 1782, while the distance seems to have remained
unaltered. H describes the small star as “a red point without sensible magnitude.” STRUVE
calls it “cinerea; ” SouTH, “blue;” SMYTH, “violet;” and I have put it down on one
occasion as “violet,” and on another as “deep violet.” The colour is remarkably vivid for
so small a star. -
(ſ/
1782-88 P = 14% D == H
1825-25. Io'25 6'294 S on 2 n.
1831 '91 Io'70 5:373 X on 6 n.
1835°42 9'9 5°9 SM * -
1846'32 8:35 5-46 J on 1 n. with 33-in. refr. at Poona.
1848'34. 7:20 5.43 O > on 3 m. with 15-in. refr.
1848°7o 7:20 5'524. DA on 3 m. with 63-in. refr.
1851.27 7-65 5-61o M on I n.
1853'24. 6-8 I 5:26 J on 2 n. with 6'3-in. refr. by Lerebours.
No. 1434 = 2 1552 = H I. 27 = 90 Leonis, A.B.
Unchanged since the discovery of its duplicity by H in 1782, as appears by the following
selection of observations.
A/
H. “With 460, 1} diam. of L.”
1782'29 P = 2038; D =
I 8oz.' I 8 2 Io'27 tº º
1822:27 208.87 4:452 H and S on 2 n.
1829-94. 209'4o 3°or 4 2 on 5 n.
1842°31 2 I 2'35 3' I 43 M on 3 n.
1851-18 21179 3.24.0 M on 3 m.
1851.28 21 o'78 3'oz7 DA on I n.
1852°30 2 I 3'O4. 3°oo3 M on I n.
No. 1436 = 2 1553.
I am acquainted with no other measures of this star than my own, except those of
STRUVE who discovered its duplicity, and one night's measures by Sir JoHN HERSCHEL in
1831 (Mem. R. A. S. Vol. VIII.), which, however, are there attributed to X 1555, and the
R.A. and N.P.D. of that star are given in connection with them. But both the angle and
distance plainly show that they belong to X 1553, and cannot possibly belong to X 1555, the
Micrometrical Measurements of Double Stars. 357
distance of which is not one-fourth as large. Including these, therefore, we have for com-
parison :-
1831 30 P = 17.58 D = #42 H on I n.
1832°58 171'48 5-34o 2 on 5 n.
1851°29 171-26 5-378 DA on 1 n.
Of X 1555 we have the following measures recorded :—
1829' 12 P = 339°36 D = #246 2 on I n.
1830-26 338°oo ... H on I n.
1832'24. 34O'3O 1'45 DA on 1 m. with 3-8-in. refr.
This star is P. xi. 111, and B.A.C. 3937.
No. 1437 = O > 241.
I am not acquainted with Mr. OTTO STRUVE's measures of this object, discovered by
him ; but MADLRR has measured it as follows:–
1847°og P = 121%4 D = #254 M on 5 n.
1853°37 II 7'99 I'45 I DA on 2 n.
[Since the above was written, I have received from Mr. OTTO STRUWE his measures of
this object, of which the mean is,
1849°32 P = 1.19%4 D = #356 O X on 5 n.]
No. 1439 = 2 1603.
This object, discovered by STRUVE, does not seem to have varied since the earlier
Inê8,SUll’OS,
1830-26 P = 8663 D = zło H on 1 n.
1831°oo 81:13 22'8o H on 1 m.
1832-18 8o'58 22'424. 2 on 5 n.
1851:29 81.46 22:468 DA on 1 n.
I measured this star by Mr. OTTo STRUVE's request, for comparison of our habits of
measuring, but have not yet received his results. MÄDLER does not appear to have ob-
served it.
358 * Rev. W. R. DAWEs, Catalogue of
No. 1440 = 3, 1647 = Virginis 191 (B).
This is evidently a binary system, with respect to which STRUVE, its discoverer as a
double star, cautiously expressed a suspicion of direct motion, grounded on the results of
five years' observations; but subsequently retracted it in consequence of his observations
in 1836. My observations in 1840, however, showed that the variation of angle continued
in the same direction, accompanied possibly by a slight increase of distance. We have the
following epochs for comparison.
1828-36 P = 19810 D = #255 2 on 2 n.
1829-37 2O2°8o I 137 2 on 3 m.
1832-84 2O4’35 I'2Oo X on 2 n.
1836-32 204 Io 1245 2 on 2 n.
184o°31 2O7'o'3 1:276 DA on 1 m. with Mr. Bishop's 7-in refr.
1850-66 2 I I '72 1.230 DA on 3 n, with 63-in. and 73-in. refr. by A. Clark.
1851.27 214-26 I'349 M on 2 n. - * º
1852:31 212°33 1.264 M on I n.
No. 1444 = 2, 1663.
The discrepancies in the measures of this close object probably arise from its difficulty
Indeed, in 1841, it was pronounced by MADLER to appear single with the Dorpat telescope.
1830'38 P = 11680 D = &813 2 on 3 m.
I 84 I-40 “Single” ... M
1842-33 I 23'30 o'55 M on 2 n.
1852:20 I 12:36 o'908 DA on 1 m. with 63-in. refr.
As the stars differ in brightness by about one magnitude, there is no ground for supposing
that they had coalesced in 1841, and have since separated in the opposite direction.
No. 1445 = 2 1670 = H III. 18 = y Virginis.
One of the most interesting binary stars in the heavens; and as every astrometer has
attended to it, the measures are very numerous, of which is subjoined a liberal selection.
1781-89 P = 13373 D =". H
1803-20 Izo'32 tº tº H -
I 822°oo I of 'o'7 2.86 > mean of all with the smaller instruments.
1822:25 I of “40 3.794 H and S on 2 n. t
Micrometrical Measurements of Double Stars.
359
1825'32
1825°32
1828-38
1829' 19
I829°39
1830'24.
I 83o'59
1831°29
1831-32
1831-36
1831.38
1832.26
1832-31
I 832°40
1832°52
1833'2O
1833'36.
I833'37
I833'44
1834'2O
I 834°29
1834'37
1834'38
I834’39
1834°54
1834:84
1835. I I
1835-38
1835'4o
1836-oë
1836'15
1836°25
1836-27
1836.29
1836-3o
1836-39
1836-41
1837:21
1837-41
1837°46
1838°o8
1838:28
P
O //
= 97-92 D = 2:373
96.88
9I'50
87.72
88°28
82°8 I
82°17
78:40
77°42
8o'92
74°9
7o'zo
69'92
7 I'4.
73°50
61-77
6o 14
65°53
62-7
48.8
47°35
43' I
51-66
45' S
34°9
33-6
21'5
I 5'48
I 5°oo
round
round
blotty
35 I:63
347°47
35o'9
348-6
33 I ‘57
265-4
257'91
255'8o
237°47
235"7
3.263
zºo'70
I '790
1782
2-216
1.586
1988
I '733
I ‘492
I-6
I "2 I
I'339
I *2
1'262
1412
I' 136
I'o;6
I'3
I "O
I'51
o'912
o°8
o°5 I4.
o'5
o'257
o'585
X on 6 n. (STRUVE's angle throughout diminished 180°).
S on 4 n. (angle— 180°).
2 on I n. -
H on 2 n.
2 on 5 n.
H on 5 n. (D on 4).
B on 7 m. with the Königsberg heliometer.
DA on 6 n. (D on 2), with the 3'8-in. refr.
H on Io n. (D on 6). -
2 on 5 m.
SM
H on 18 n. (D on 1).
DA on 9 n. (D on 4) with 3.8-in. refr.
SM
2 on 4 n.
H on 12 n. (D on 3).
DA on 8 n. (D on 2) with 3.8-in, refr.
2 on 7 n.
SMI
DA on 8 m., on 4 with 3’8-in, refr. and 4 with 6'3-in. Newt.
H on 8 m. with 5-in, refr. at the Cape (D on 1).
2 on 5 n.
SM
H on 7 n., at the Cape.
2 on I n.
H on 8 m. at the Cape.
2 on 9 n. -
SM
SM
SM
SM
DA on 1 n, with 3.8-in, refr. “Slightly elongated.”
DA on I n. with same. “Certainly elongated.”
SM “Elongated.”
SM “Elongated.”
2 on 3 n,
SM
X on 6 n.
E on 9 n.
H on I n, at the Cape.
SM
360
Rev. W. R. DAWEs, Catalogue of
1838.32 P = 23:42 D =
1838-43
I 839'32
I 839°35
1840°26
1840'38
I 84. I'34.
1841°35
1842°2 I
1842:38
1843°o8
I843°33
I 843°37
1843°46
I 845'34.
1846-90
1847:29
1847°41
1847:41
1847-94
1848-36
1848:36
1848.38
1848°45
1848-48
1849°37
1849'42
1850.36
1850'48
1851 36
I 85 I-40
1851-40
1851'47
1851.96
I852'24.
1852.26
1852°32
1852'42
1852'42
I 852°43
1852'48
I 853°24
231'o6
2I4°59
21 5-48
2O793
zoș’71
zoo'oS
2Ooºog
196.63
I94'98
1928
191.6
192°75
I9 I*53
185'39
18377
182-83
182: 15
181-87
17990
I 79° 52
180°38
18o:60
179'58
[18o'51]
179'oz
[177°ool
176.67
[179'69]
[176:30]
I75'97
176.5o
I75'90
176:43
I 75'47
175°28
I75’27
I75' 5
I 75'4o
174.66
[17970]
173°28
M/
o°8o I
I •266
I ‘294.
I'302
I ‘24. I
I ‘579
I'729
I'584
I'732
I '9
I '9
1.827
2." IO
2°45 I
2'32O
2'489
2-6
2-88
2-8
2-637
2.603
2’6oo
2’60o
2.850
2'920
2.946
2’945
3'O4·o
3'O47
2'99 I
3'O4o
3'304
3' 12
3' I 22
3'oï6
3°2
3' I 49
3'169
3' 197
3' I 2
DA on 1 m. with 3-8-in. refr.
2 on I I n.
DA on 2 n. (D on I).
G. on 5 n.
K
DA on 11 n. (D on 7) with Mr. Bishop's 7-in refr.
DA on 7 n. (D on 5) with same.
M on I 2 n.
M on 1 on. (D on 5).
DA on 9 n. (D on 5) with 7-in. refr. at S. W.
SM
SM
DA on 6 n. (D on 5) with 7-in, refr. and Pr. Cr. M. at S.V.
DA on 4 n. (D on 5) with 7-in refr. and P.W.M. at S.V.
SM
DA on 2 n. with 63-in. refr.
DA on 2 n. with same and Sph. Cr. M.
DA on 6 m. with same and P.W.M.
SM ... "
J on 1 n. with 3.8-in. refr. at Poona.
SM
DA on 2 m. with 63-in. refr. and Sph. Cr. M.
DA on 7 n. with same and P.W.M.
W. and G. P. Bond on 1 n. with 15-in. refr.
MAIN on 2n(Don 3) with 6.7-in. refr. and 4-glass D.I.M.
DA on 5 n. (D on 4) with 63-in refr.
MAIN on 3 m. with 6.7-in. refr. and 4-glass D.I.M.
F on 6 m. with 44-in. refr.
MAIN on 4 m. with 6.7-in. refr. and 4-gl. D.I.M.
MAIN on 3 m. with same instruments.
F on 6 m. with 44-in. refr.
DA on 5 m. with 63-in. refr.
M1, P by 15 obs.; D by 16.
M on 4 n. (D on 3).
J on 3 m. with 4-in. ap. on the Lerebours refr.
MI, P by 48 obs.; D by 48.
DA on 2 m. with 63-in. refr.
SM
F on 5 m. with 4%-in. refr.
M on 2 n.
MAIN on 3 m. with 6.7-in, refr. and 4-gl. D.I.M.
J on 2 m. with 6'3-in. refr. by Lerebours.
Micrometrical Measurements of Double Stars.
... " . . . O - //
1853'27 P = 174.90 D = 3 I ob
1853° 32 174:58 3’ 185
1853°35 1739 3'2
1853'36 174°16 3'o65
1853.38 [177'39] 3'305
I 85.3°39 I 74°2O 3'25o
1853-91 173°oo 3'o6
1854:39 I 72°o3 3'448
1854:39 I 72°53 3' I 95
1854-40 172.87 3:220
1854'91 172°33 3'3 I 5
*
MI, P by 56 obs.; D by 80.
F on 6 n.
SM
DA on 3 n. (D on 2) with 64-in, refr.
MAIN on 2 m. with 6.7-in. refr. and 4-gl. D.I.M.
M on 6 n.
J on 2 n. with 6'3-in. refr.
M on 8 m.
DA on 7 n. with 73-in. refr. by Al. Clark, and P.W.M.
DA on 1 n. with same, and Sph. Cr. M.
DE on I I n.
No. 1526 = X 1678.
The diminution, both in the angle and distance of these stars, suspected by STRUVE from
his own observations, is fully confirmed by subsequent measurements, and by SouTH at
Passy.
1825'30 P = 21342 D = 33359 S on 2 m. with 5-in. refr.
1828-29 212°5 I 32°737 2 on 3 n.
1836-25 2 I o'71 32°457 2 on 3 n.
1851.27 207-73 32:393 M on 3 n.
185 I:29 207'63 32'o64 DA on I n.
1852.32 207 13 31.764 M on 1 m.
1854.38 zoé.38 31'902 M on 3 m.
No. 1527 = X 1685 = H IV. 58 = P XII. 201, 202.
The observations of these stars since they were first measured by H indicate no variation
either in angle or distance.
1783’ I 5
1823°41
1829.87
183 I'39
1838'28
1851'32
We have for comparison :- -
P = zožo; D = 15.860 H
202:18 16:963 H and S on 2 n.
zoo'85 15-82O > on 6 n.
2O I ‘4. I 5'9 SM
2OI '9 16.2 SM
2O I ‘28 I 5'928 DA on 1 m.
No. 1528 = X 1687 = 35 Comae Berenices, A B.
This is the larger star of the excessively unequal double star H v. 130. It was dis-
covered by STRUVE to be close double while measuring the distant star. My measures at
ROYAL ASTRON. SOC. WOL. XXXV.
3 A
**
* *
362 Rev. W. R. DAWEs, Catalogue of
Mr. BISHOP's observatory in 1842 left no doubt of the close pair having an orbital motion,
and the angle has continued regularly to increase, while the distance has scarcely varied.
We have the following epochs for comparison,
I 829'99 P = 2#30 D = *432 2 on 5 n.
1834'38 3o'o I "O SM “Extremely difficult.”
1842°39 36-60 1.5ol DA on 5 n. (D on 3) with 7-in refr. at S. V.
1843°32 42°o I'5 SM -
I843'34. 38'91 1:415 DA on 4 m. with 7-in. refr. and Pr. Cr. M. at S. W.
1848-12 . 39'25 ... DA on 3 n, with 63-in. refr.
1848:45 .. I'573 DA on 2 n. with same.
1849-33 4O'92 1 555 DA on 2 n. with same.
1851'oo 43' 14 1234 M on 4 n. (D on 3).
1852.32 43'92 I'239 M on 3 n.
1853.38 43'86 I-618 DA on 3 n.
1854'38 4o'56 1' 172 M on 1 n.
1854'41 43-67 1'5ol DA on 3 n. with 73-in. refr. by Al. Clark.
There is no evidence of change in the more distant star.
No. 1549 = 2, 1694 = H IV. 15 = Camelopard. 32 Hev.
This wide pair formed one of a series of objects proposed to me by Mr. OTTo STRUvE for
comparison of our measures. It has also been attended to by several other observers; but H
has given no measure of the angle. -
O 4/ -
1820:37 P = 327:45 D = 2 I'95 2 with the smaller instruments at Dorpat.
I 822°28 327°oo 22'o69 H and S on 2 n.
1832°51 327°24 2 I '755 2 on 4 n.
1833-97 327°3 21.8 SM
1837.84 327°4. 2 I '89 X on on.
184o'51 327°4. 22°1 I O 2 on I n. with 15-in. refr. at Pulkowa.
1848-52 327°4′o 2 I-831 DA with 63-in refr.
The very close agreement of all the results is remarkable.
No. 1551 = 2 1690 = H II. 42.
By comparison of SouTH's measures in 1823 with those of H a slow increase of angle
seemed to be indicated in these stars; which however was not supported by the observations of
Micrometrical Measurements of Double Stars. 363
STRUVE, and is reversed by those of more recent date. Notwithstanding the obliquity of the
position the differences, amounting to between 5° and 6° in the modern observations, appear far
too great for stars whose distance is 6".
fº
1783-18 P = 14:49 D = ... H
18oz. 31 I 44'43 ... H -
I 822°8o I 50°30 ... X with the smaller instruments at Dorpat.
1823°39 I 5o'32 6758 S on I n, with 5-in. refr.
1829-60 151-23 5'773 X on 3 m. with 9-6-in. refr.
1835°35 148°32 5°913 2 on 3 n.
1841-67 145'65 6’ I 59 DA on 5 n. (Don 4), with Mr. Bishop's 7-in, refr.
1842-32 I49°79 5'592 M on 2 n. (D on 1).
1843°31 I 45'93 6°oAo DA on I n. with 7-in. refr. and Pr. Cr.M. at S.W.
1854'27 145.62 6°o27 DA on I n. with 74-in. refr. by Alvan Clark
and P. W. M.
If the large discrepancies in this series of measures of position really arise simply from the
obliquity of direction, nothing can more clearly show the necessity of adopting efficient means
to counteract the bias so apt to arise from that cause. I may be allowed to remark that my
angles were observed with different telescopes and different kinds of micrometer; yet the agree-
ment of the angles is very close:—a result which I attribute to the care uniformly taken to
place the stars parallel to the vertical section of the eye, either by observing the object to the
east of the meridian, with a slight inclination of the head; or by the use of the eye-piece prism,
which places the stars completely under command, wherever they may be situated and whatever
may be their position.
No. 1558 = 2 1704 = H IV. 51 = 44 Virginis.
One of HI’s most delicate discoveries. It is astonishing that he should have succeeded in
measuring such an object, even approximately, in distance, with a reflector of only 6-3 inches
in aperture. The discrepancies are not great, considering the difficulty of the object, and the
following results indicate that it is unchanged.
1782. Io P = 57 so D = 22.283 H “Dist. inaccurate.”
1830:63 53°o2 2 I-290 2 on 3 m.
1847-87 53'89 20, 187 M on 2 n.
1851.28 53°45 zo'436 DA on I n.
364 Rev. W. R. DAWEs, Catalogue of
No. 1559 = X 1728 = 42 Comae Berenices.
One of the closest of STRUVE's discoveries; and it seems probable that it forms one of the
most interesting of the binary systems yet known, from the shortness of its period of revolu-
tion. What this may be, however, is rendered doubtful by the extreme difficulty of the object,
—none but the finest and largest telescopes under the best atmospheric circumstances being
competent to deal with it. This is sufficiently proved by the following series of measurements,
which however does not throw all the light upon the subject which is desirable. It must there-
fore be earnestly commended to the attention of those astrometers who are possessed of the
largest and best instruments in existence.
1827-83 P = 9’s D = "... x on 2 n.
1829:40 I I-6 o'64o 2 on 3 n.
1832.38 Round SM
1833'37 Single X on 2 n.
1834'42 A little oblong X on I n.
1835' 39 tº: } Oblong X on 4 n. “Non disjunctae.”
1836-41 {:}; } o:303 > on 3 n. “Disjunctæ.”
1837-40 Io'98 o:395 2 on 6 n.
1838-41 I I 5o o:358 X and O > on 3 n.
1839°4 I I O'O ... SM. “Elongated.”
184o'74 1985 I o'425 DA on 3 n. with Mr. Bishop's 7-in. refr. (Dest.)
I 84I'4o 4*7 I o:324 M on 11 n. (D on 5).
1842°45 I 5'56 M on 4 m.
1842.5o 5°o3 o'3 est. SM
I842'53 Single DA with 7-in. refr. at S. V.
I 843°45 Single DA with 7-in. refr. at S. V.
185 I'42 3.8 o'42 O > on 4 n. with 15-in, refr. at Pulkowa.
1851-96 194'56 o'467 M on 3 m.
1852°42 190-98 o:52.1 M on 6 m. (D on 4).
1853°og I4'2 I o:626 DA on 4 m. with 63-in. refr.
1853°35 194'09 o:623 M on 14 n. (D on 12).
1854:39 1279 o:552 DA on 5 m. with 74-in. refr. by Alvan Clark.
1854'4o 193.62 o:684 M on 8 m, (D on 7).
In STRUve's Introduction to his Positiones Mediae, p. ccxv., he says of this star, “Between
1829 and 1851 the star has twice become single, first in the years 1833 and 1834 and then
in the years 1845 and 1846.”
Micrometrical Measurements of Double Stars. 365
No. 1573 = X 1744 = H III. 2 = . Ursae Majoris.
A wide but splendid double star, which has lately become peculiarly interesting from having
been submitted to the photographic process by the observers at the observatory of Harvard
College, Cambridge, Massachusetts. The following series indicates that no considerable change
has taken place either in position or distance since the earliest micrometrical observations.
178o: P= 14677 D = 1%; H -
182O'90 146-2 14.63 > with the smaller instruments at Dorpat.
1822:24 147.77 14:455 H and S on 2 n. with 33-in, refr.
I 83 o'44 147'85 14:205 H on 3 m. with 5-in. refr.
1830-63 147'60 14:368 2 on 6 n.
1830'85 I 47°o 14-6 SM
1831-ol I 47° 32 14:435 B on 6 n. with the Königsberg heliometer.
1839'32 I 47°4. 14'4 SM
184077 147.68 14:35 OXon 4n.with 15-in. refr. at Pulkowa (Ms. letter)
I 84I '55 147'70 14:58o M on 2 n. (D on 1).
1842.8o 148:22 14:530 M on 2 n. (D on I).
1847-61 I 48:25 14:25 O 2 on 2 m. with 15-in. refr.
1848-49 148'oz 14, 165 DA on I n. with 63-in. refr.
1851-18 I 48°og 14:220 M on 6 n.
1851.86 148'38 14:200 M on Io n.
1853'32 I 48-27 14:1 or M on 2 n.
1854-56 148-64 14 155 M on 5 n.
1854.72 148. I I 4°2 SM -
In 1857, Mr. W. C. Bond, Director of the Observatory of Harvard College, assisted by his
son Mr. G. P. Bond, procured several photographs of these stars by the aid of the 15-in. refr. ;
the distances being read off by Mr. ALVAN CLARK's ingenióus reading microscope. The Pos. by
3 pictures came out = 147°49; and the Dist. by 13, = 14"-49; Epoch 1857'34. As these
stars do not appear liable to relative change, I here append a comparison with it of the results
obtained by the various observers in the series. Assuming the photographic results to be
correct, the following are the deviations from it of the mean results of the several observers.
In computing the means, a weight is given to the result at each epoch proportioned to the
number of nights of observation, or to the weights assigned by the observers.
Observers. A P A D Nights. Observers. A P A D Nights.
H - &72 + &oi FI + &36 tº- o:28; 3
X (1) — I’29 + or I 4. X (2) + o- 1 1 — o' I 22 6
H and S + o'28 — O'o.35 2 - SM + o-o; — o' I 25 3
366 Rev. W. R. DAWEs, Catalogue of
Observers. A P A D Nights. Observers. A P A D Nights.
B g-e & 17 * - &oss 6 M .. e- &274 25
O > + o'38 — o' 173 6 DA + o'53 – o'325 I
M + o-62 e e 27
In the above comparison, X (1) denotes the results with the smaller instruments at Dorpat;
and X (2) those obtained with the large equatoreal. It is remarkable that, while the observed
positions almost uniformly exceed those of the photograph, the measured distances as uniformly
fall short. My own has very little weight, being the result of only four observations on one
bad night. It should however be noticed that among the three angles of position given by the
photographic process there is a difference of no less than 2° 13 (1.46°40, 148°53, 147°55);
an amount which the eye could not endure on this object in measures with an equatoreally
mounted telescope; and also that among the 13 results of distance the extreme difference
amounts to o”58;—considerably exceeding the greatest between any two observers in the list.
It seems, therefore, that at present the photographs can only be regarded as producing approxi-
mate results.
No. 1574 = O > 266.
Of this close pair, discovered by Mr. OTTO STRUVE at Pulkowa, I am acquainted with no
other observations than MADLER's and my own; and considering the difficulty of the object,
the differences are not so great as to indicate any change since its discovery. We have for
comparison,<-
1846. Io P = 328°26 D = #204 M on 4 m.
I 847'34. 3.25°30 ... DA on I n. with 63-in, refr.
1851.38 329'95 I-270 M on 5 n.
1854:27 327, 16 I'oZ6 DA on I n. with 73-in. refr. by A. Clark.
[Mr. OTTO STRUVE has recently favoured me with his measures of this object, of which the
following is the mean result.
1846. Io P = 324%; D = #157 O 2 on 4 m.].
No. 1576 = 2 1757 = P XIII. 127.
A close double star, discovered by STRUVE, who inferred its binary character from his own
measures during ten years. Both the angle and distance have increased, the former more than
40°. The results by various observers furnish the following Series.
Micrometrical Measurements of Double Stars. 367
1825-37 P = Iolo D = 160 2 on I n.
1829'82 I9'5o I'445 2. On 2 n.
1833'38 23.90 I'54o 2 on 2 n.
1835-37 25'50 1.667 X on 3 m.
1836.42 29°45 I'645 2 on 2 n.
1838-48 3 I'o 1.7 SM
1841°38 36°o3 I'747 M on 4 n.
1842°39 37°42 1:678 DA on 2 n. with Mr. Bishop's 7-in. refr.
1842°52 37'9 1.7 SM
1843°45 38.82 tº gº DA on 2 n. with the same.
1845.88 40°81 2°o26 M on 2 n.
1852°38 51.7 2*O SM
1853°o9 52'25 zºo;6 M on 3 n.
1854°37 5o 18 2-162 M on 5 n,
No. 1580 = 2 1763 = H I. 80 = 81 Virginis.
Discovered by H. A slow retrograde motion in angle is probable, while the distance has
remained nearly the same. -
//
1783 Io P = 48%o D = , . H
1822-94 42°73 4'ozo H. and S on 2 n. (D on 1).
I 83 o'34. 39°o2 2’685 X on 4 n.
I 84 I 39 4. I ‘I 2 2.823 M on 3 m.
1842-37 41-63 2:773 DA on 1 n. with Mr. Bishop's 7-in. refr.
1854'37 43°o I 2.756 M on 2 n.
No. 1581 = X 1768 = 25 Canum Venaticorum.
This remarkably interesting binary star is one of STRUVE's discoveries. He has called it
“Can. Venat. 181;” but it is the same as 25 Can. Venat. of FLAMSTEED. From the general
tenour of his results between 1827 and 1836 he suspected orbital motion; but with his usual
caution he adds, “Atvero inter angulos primos sunt magnac discrepantiae, ita ut non plena sit in
motu fides habenda.” Subsequent observations, however, have proved the suspected motion to
be real, and the stars have of late years so nearly coalesced that my optical means have scarcely
sufficed to produce a decided elongation. It is desirable that the star should be carefully
watched by those observers who possess large and excellent instruments.
1829'89 P = 7558 D = tºo;4 2 on 5 n.
1833. I2 72°42 I'ogo 2 on 5 m.
368
Rev. W. R. DAWEs, Catalogue of
1836.50
1841 "39
1842°35
1851.28
1852°33
1853'32.
1854'43
O
P = 71-77
70-84
67-72
56:51
44-78
36-20
36-26
O'998
O'993
o°39
o'3 I
O'35
D = foya > on 3 n.
M on 4 n.
DA on 3 n. (D on 1) with Mr. Bishop's 7-in, refr.
M on 6 n. (D on 4).
M on 4 n.
M on I n.
o:35 est. DA on 3 n, with 78-in, refr. by Alvan Clark.
No. 1590 = h 3341 = Smyth's Cycle 488.
A close and faint double star discovered by Captain SMYTH while observing in Sir JoHN
HERSCHEL’s 20-foot refractor the fine cluster 3 Messier Can. Venat.
There may be some
ground for suspecting a diminution of distance since its discovery; but the distinct visibility
of such an object depends so much on atmospheric circumstances as to render this doubtful.
The following are the only observations of it with which I am acquainted:—
1835'48
1835°50
I 842°47
1848:42
1851-37
O
P = 1915
190°o
13°o
196'90
I 95°o
M/
D = 1°o
SM
175 est. H, with zo-foot refl.
o:6
o°8 est.
I “O
CEI on I n. with II #-in. refr. at Cambridge.
DA on I n. with 63-in. refr.
SM
No. 1591 = X 1770 = P XIII. 156.
This object, discovered by STRUVE, seems to be unaltered. It has not been much observed,
and the agreement of the results is not very close.
1830'94
1831.8o
1832-81
1842-70
1844'52
1848-49
O
P = 12 I-64
I 20-97
I Ig'9
I 2 I ‘47
- 1 17' 5o
I 19°oo
D = #654
I '790
I '9
1-605
‘I “S4O
I '753
the deep blue of B forming a fine contrast.
of H and of H and S seemed to indicate orbital motion, which has not been corroborated by
H on 2 n.
2 on 4 n.
SM
M on I n.
O X on 2 n., communicated by letter.
DA on 2 n. with 63-in. refr.
No. 1593 = X 1777 = H II. 44 = 84 Virginis.
This is one of the discoveries of H. It is a beautiful object; the decided yellow of A and
A difference of about 1 o’ between the measures
Micrometrical Measurements of Double Stars. 369
subsequent observation. Probably the oblique position of the stars combined with the great
inequality in their magnitudes may have caused the large discrepancies among the measured
angles in the following selection of epochs:—
A/
1782. 12 P = 24692 D =
H, “with 460, 2% diam. of L,” with 6'3-in, reflector.
18oz. 31 239'82 © º H
1821:37 229'85 3.913 H and S on I n.
1828-77 235'38 3°394 2 on 5 n.
1830-20 232'92 4'o6 H on I n.
1831' 19 232°9 37 SM.
1831-28 235' 3O H on I n.
1833.26 228.83 e e H on I n.
1841-24 233'37 3.726 DA on 3 n. with Mr. Bishop's 7-in. refr.
I 843'34. 23 1.78 3*608 DA on I n. with same and Pr. Cr. M.
1851.56 232°53 3'499 M. On 5 n.
No. 1597 = X 1781.
A difference of 4° between STRUVE's measures in 1828 and 1833 led me to include this
star in my working catalogue. My observations of it do not, however, indicate any variation
since the former date. I am unacquainted with any other measures of it than those of STRUVE
and my own.
1828-32 P = 233.6 D = 1°21 > on 1 n.
1829-38 239-8 I '39 2 on I n.
I 833'22 242°7 I '47 2 on I n.
1842'3 I 238.65 . 1201 DA on 2 m. with Mr. Bishop's 7-in, refr.
No. 1599 = H 232 = O > 270 = r Boötis.
The excessively minute companion of this star was discovered by Sir JoHN HERSCHEL
with his 20-foot reflector, and classed by him of the 16th magnitude. Mr. OTTO STRUVE's
observations during seven years establish the participation of the small star in the proper
motion of the large one. The only observations I am acquainted with are the following.
1825'o -- P = 34; + D = 24-25" H, by estimation, with 20-foot refl.
1843-28 347°5 Io' 35 O >, with 15-in. refr.
1846'37 349'8 1o 17 O X, with same.
1848:42 34.9°4-O I o'og7 DA, with 63-in. refr.
I 849°37 348-8 9°84 O X, with 15-in. refr.
1850-31 348-8 9.87 O X, with same.
1854:28 34.9°30 9:356 DA, with 73-in. refr. by Alvan Clark.
ROYAL ASTRON. SOC. WOL. XXXV. 3 B
370 Rev. W. R. DAWEs, Catalogue of
No. 1601 = X 1804 = H N. 115 = Bootis 76 (B).
A difference of —8°43 between the measure of the angle by H in 1796 and by STRUVE
in 1827, with the continued decrease of STRUVE's angle in subsequent years, excited hopes
that this object might prove to be binary. Continued observation has led to an opposite
conclusion, as the following results will show. -
1796.60 P = 276; D = "... H. “Dist. 4 diam, of L."
I 825-35 20°28 4.888 S on 2 n.
1829:41 I9'95 e tº H on I n.
1829.62 18:30 4’373 2 on 3 n.
183 I'4. I 18:50 4' I I H on I n.
1841-37 18-65 4,635 DA on 3 m. (D on I) with Mr. Bishop's 7-in, refr.
I 842°4′o 1965 - DA on 2 n. with the same.
I 842°40 1892 e tº M on 3 m.
1848-43 I9'95 4:369 DA on I n. with 63-in. refr.
No. 1608 = X 1813 = H N. 98.
* There seems to be sufficient evidence of a slow direct motion in position, while the distance
has probably varied but little, if at all. We have for comparison,
//
1793'36 P = 18&oo D = . . H “13 diam, asunder.”
I823'34. 190-67 6-o;9 H and S on 1 m. with 33-in, refr.
1829-81 I9 I'oo 4:760 X on 4 n.
1842'27 192: 17 4'948 DA on 7 n. (D on 6) with 7-in. refr. at S.V.
I843°35 19396 4:840 DA on 2 m. with 7-in. refr. and Pr. Cr. M.
1851.28 I93*I 3 5' 146 M on I n.
It is, however, obvious that little, if any, change has occurred within the last 28 years;
and were it not for the precision with which H determined the position to be “directly in the
meridian,” we should be justified in concluding that some error had been committed in the first
observation. The star may be worthy of further examination.
No. 1617 = X 1816.
Discovered by STRUVE. Though the measures of position are by no means uniform, there
is no sufficient ground for Suspecting orbital motion. -
1828:42 P = 72°37 D = *55 H on I n.
1830-26 79° 55 1.86 Hon 3 n. (D a mean of 1"o8, 1"'91, and 2", 31).
I 831°33 8o 16 I '868 X on 5 n.
Micrometrical Measurements of Double Stars. 371
/
1833:26 P = 76°28 D = #92 H on I n.
1841-88 79°35 I'688 DA on 3 n. with Mr. Bishop's 7-in. refr.
1842'44 78'24. I'60 M on I n.
I 843'34. 78.36 I'835 DA on 3 m. with 7-in, refr. and Pr. Cr.M. at S.V.
This star is B.A.C. 4723.
No. 1624 = X 1819.
This is a binary system, as its discoverer, STRUVE, pointed out in 1836; and the following
series renders it even more certain.
- O //
1828.35 P = 88°o; = o'865 X on 2 n.
1832°42 81.75 I Io; 2 on 2 n.
1836-43 76. 12 I 127 X on 3 m.
1841 "35 65’21 o'95o M on I n.
I 842°4′o 63'22 o'867 M on 3 m.
1842-81 6o 56 1'o62 DA on 8 n. (Don3) with Mr. Bishop's 7-in, refr.
I 843'34. 61.92 I'o22 DA on I m. with same and Pr. Cr. M.
I 84.5' 39 57'14 I'O4.1 M on I n.
1847.38 54." I 5 1' 166 M on 5 n.
1851°30 49-63 1'268 M on 5 n.
1854'4o 44'45 I 143 M on 4 n.
This star is worthy of continued and careful attention.
No. 1633 = X 26 in Appendia, I. = H v. 9 = 1 Boötis.
In observing this star with MERz's 63-in, refractor, no elongation of the large star was
perceptible, as indeed might reasonably be expected with so moderate an aperture. The
difference of judgment with respect to the colour of the smaller star is curious. H says,
“S dusky.” STRUVE, “minor = 7.5, alba.” SMYTH, “C 8, creamy white.” DAWEs, “C 7},
deep purple.” Recent measures of the position and distance of Af and C, are remarkably
coincident.
O M/
177974 P = 37.15 D = 37'56 H
1822-24 33°40 38'047 H and S on 2 n.
1831.66 33°7 38. I SM
1836-22 33' IQ 38°o53 X on 4 m.
1838-18 33°4. 37'9 SM
1848' 55 33'57 38: 120 DA on 1 n, with 63-in. refr.
1851-62 33"Io 38:17 O X on I n, with 15-in. refr.
372 Rev. W. R. DAWEs, Catalogue of
No. 1634 = 2, 1834.
This close but not very difficult star affords a remarkable instance of presumed rapid
orbital motion, which has since been proved to arise solely from enormous errors of observa-
tion. (See Note appended to Sir JoBN HERSCHEL’s “Remarks on his Fifth Catalogue of
Double Stars found with his 20-foot reflector,” in the Mem. R. A. S. vol. vi. p. 81, and also his
Note to No. 959 of his “Measures of Double Stars with his 7-foot equatoreal.”) The
following series shows that there is no reason to suspect any orbital variation.
1829:73 P = 113’so D = #355 X on 2 m.
1830-23 IO4°o I 1: 1 18 H on 2 m. with 5-in. refr.
1830°36 IoS-6o I est. H on I m. with 20-foot reflector.
1831°37 Io9'28 I "2O H on I n.
I 83 I'54 I 13°oo I "44 2 on I n.
1833°26 II 5"o3 e Q H on I n.
1833.78 I I4'9 I'3o 2 on I n.
I 84o'54 I I I '84. 1: 127 DA on 3 m. with Mr. Bishop's 7-in. refr.
I 84 I 53 I I I ‘40 1.21 o O > on 2 m. with 15-in, refr. (MS. letter.)
1842-67 II 3 '99 I'374 M on I n.
1848-86 I I 2 'o6 I'oZo DA on 2 m. with 63-in refr.
No. 1639 = X 1850.
My measures of this star were taken for comparison with those of Mr. OTTO STRUVE,
which I have not yet received. Compared with those of its discoverer, the fixity of the
components is well established.
1832°oo P = 26*26 D = 2#687 2 on 4 n.
1851'52 262:29 25'417 DA on I n, with 63-in. refr.
No. 1640 = X 1865 = H N. 114 = & Boötis.
This close and beautiful double star, discovered by H in 1796, has been sedulously
attended to by most double-star observers; but, notwithstanding considerable discrepancies
in the results, no sufficient ground appears for suspecting relative motion. The oblique
position of the components may in great measure account for the errors of observation, where
no suitable precautions have been taken to avoid its effects; and their relative brightness
being subject to a slight variation, has caused the angle of position to be registered sometimes
in the second quadrant, and sometimes in the fourth, by the same observer. In the following
series the angles are uniformly quoted as in the fourth quadrant, for their more ready com-
parison,-the instances being noted in which they have been increased by 180°.
Micrometrical Measurements of Double Stars.
373
1796:60
1823-27
1828’44
1830'30
1830°47
1831. 18
1831°39
1832'47
1833'30
1833°39
1834; 38
1834:43
1838:45
1841 "39
1842-36
I 842°43
1843'32
I 843°40
1844'4o
1845.26
1846-19
1847-65
1848'1 1
1848°43
185o'32
1852°38
1852'54
1853°31
I 853'49
Discovered by STRUVE, who suspected a diminution of distance between 1831 and 1836.
O
P = 311.98
306'97
307.67
3 I 3°o S
309: 17
31 o'68
308:48
30828
3 II*25
309'9
309'8
31 o'o6
308.6
3 Io'o 5
3 II or
307'3
D
307°o 3
308:41
305°o 5
3og'69
307'oo
308-70
306. 55
306'57
3OS'75
308-20
307.76
307'23
306.21
//
1683
I ‘393
1’ 189
I •288
I 147
I '323
I'2O5
I'3
I'4.
'1' 3
I '3 I 5
I 164
I "2
I ‘O39
I to 54
I I 74
I 193
I "2
1.227
1'o'76
I'oz9
I 'O
I ‘O42
I 191
I ‘24.
H “Dist. = 3 diam.”
H & S on 1 m. (exquisitely fine), with 33-in. refr.
H on 1 n. with 5-in. refr.
H on 4 m. with 5-in, refr.
X on I I n.
B on 4 m. with the Königsberg heliometer.
H on 6 m. -
DA on 3 n. (D on 1), with 3.8-in. refr. (+180°).
DA on 1 m. with same (+180°).
SM (+180°).
SM (+180°).
DA on 2 m. with the Herschel 6'3-in. refl. (+180°).
SM (+180°).
M on 4 n.
M on 3 n.
SM (+180°).
DA on 1 n. with Mr. Bishop's 7-in. refr. & Pr. Cr.M.
M on 7 n.
O X on 13 m. communicated by letter.
M on 6 n.
J on I n, with 33-in. refr. at Poona (+180°).
M on 6 n.
DA on 3 n. (D on 4), with 63-in. refr. & Sph. Cr.M.
DA on I n, with same, and P. W. M.
F on 1 m. with 44-in refr. (+180°).
SM .
M on 8 n.
MI, P by 32 obs. and D by 32, with 44-in, refr.(+180°).
J on 5 n, with 6'3-in. refr. at Madras.
No. 1647 = X 1867 = Boötis 260 (B).
This is confirmed by my observations; and MÄDLER's rather Support the same conclusion.
The angle also seems to be slowly decreasing.
1831.84
1836. 50
1841°41
1842:58
I 849'4 I
- O
P = 21.83
zo'77
19-61
I9'24.
18° 53
D =
#630 2 on 3 n.
I'4oo 2 on 3 n.
17o M on 3 n. (D on 2).
I'494 M on 2 n. (D on 1).
I'338 DA on I n, with 6'3-in. refr.
374 Rev. W. R. Dawes, Catalogue of
No. 1648 = X 1877 = H I. 1 = a Boötis.
One of the most beautiful double stars in the heavens, discovered by H in 1779. Not-
withstanding discrepancies in the results, there seems to be sufficient evidence of a very slow
direct motion in angle. The large differences among the measures of position by different
observers, and even by the same at various times, very probably arise from the oblique
position of the stars, and the neglect of the requisite precautions. The estimations of the
colours of the components are arranged in the following table.
A B
Observers and Instruments.
Blue, or rather a faint lilac
Reddish H with 6'3-in. reflector.
Yellow Blue-green H and S with 3.8-in. refr. by Dollond.
Egregie flava Egregie cerulea X with 9-6-in. refr. by Fraunhofer.
Pale yellow Sea-green SM with 5.9-in. refr. by Tulley.
Orange |Blue DA with 7-in. refr.by G. Dollond, at S.V.
Yellow Green-blue DA with 63-in. refr. by Merz.
Yellow Green DA with same.
Bright yellow Pale green DA with same.
Orange Green J with 6'3-in. refr. by Lerebours.
DE with 53-in. dialytic refr. by Plössl.
Judgment of B varying.
Jaune clair Vert brilliant : Azur.
So beautiful an object has, of course, attracted the attention of all astrometers, and,
consequently, the results obtained at different epochs are very numerous. It is much to be
regretted that the following selection throws no clear light on the interesting question,
whether we have here a binary system.
1781-73 P = 30 siz D = ". H by 6 measures on different nights.
18o3'oï 3 14-65 - e. H by 8 measures. -
1822-55 322'98 3'931 H and S on 5 m. (62 obs.)
I 825°43 3.24°35 3.356 S on 6 n. with 5-in. refr. at Passy.
1829'39 32O'98 2’642 X on 18 n.
1830-27 322'48 3'878 H on 5 n.
1831.36 321° 58 © & DA on I m. with 3'8-in. refr.
1831'46 321-6 3°2 SM
1833'53 323.8 3.8 SM
1835-61 320-60 2-635 2. On 4 n.
1836°oo 32 I'90 2.722 M
1838.68 32 I ‘2 29 SM -
I 84 I ‘43 320-89 2'902 DA on 2 n. with Mr. Bishop's 7-in. refr
1843-92 323'88 2.705 M - -
1848: 19 32.2' 19 2-672 DA on 5 m. with 63-in. refr.
Micrometrical Measurements of Double Stars. 375
I 848'54 P = 323i D = 4.8 SM
185 o'74. 325-56 2-61 1 M on 7 m.
1850-95 322.68 2.74.4 F on 6 m. with 44-in. refr.
I 852'94 32 I ‘25 2.829 MI, P by 25 obs. D by 40. -
1853'2O 323°o8 2-635 J on 2 n. with 6'3-in. refr. at Madras.
1854'4. I 325'79 2'576 M on 6 n.
1854°52 322'99 2.686 DA on 3 m. with 73-in. refr. by A. Clark.
1854-69 322 82 2,783 DE on 7 n., with 53-in. dialytic refr. by Plössl.
No. 1659 = X 1881,
The difference between STRUVE's result and my own is not sufficient to countenance any
change either in the angle or distance of these stars; especially as each of mine was obtained
on one night only, and under unfavourable circumstances.
1830'99 P = 35796 D = 3640 2 on 3 m.
1831:37 356-3o 4. 122 DA on I n. with 3.8-in. refr. by Dollond.
1849'47 356:23 3.8oo DA on 1 n, with 63-in. refr, by Merz.
No. 1660 = X 1884 = Boötis 286 (B).
Considering the closeness of the components, the difference between STRUVE's result and
mine is too small to render probable any orbital variation. -
X on 3 m.
DA on 1 with 63-in, refr.
O //
1829.78 P = 52:20 D = 1.230
1848°43 54°9'O I'35o
No. 1661 = X 1888 = H II. 18 = & Boötis.
This very beautiful double star is now fully proved to possess a binary character, which
was at one time rendered doubtful by the large errors which had entered, into some of the
earlier measures. The colours of the components form a fine contrast; A being termed
yellow, reddish yellow, orange; and B, deep lilac, or purple. It is very remarkable that H
has stated “A to be pale red, and B, garnet, or deeper red than the other.” The retrograde
motion has amounted to nearly 24° in the 32 years between STRUVE's epoch in 1822 and
mine in 1854. The distance may have diminished to a small extent; but there can scarcely
be a doubt that the distance quoted in the following series under date 1821.20 (viz. 9"259) is
much too large; and that even the measure in 1823 (= 8*419) considerably exceeds the
truth. It will be seen that measures taken only a few years afterwards give the distance from
1" to 2" less than those quoted above.
376
Rev. W. R. DAWEs, Catalogue of
1780-69
1804'25
182 1 °2O
1822-69
1823'34.
1825:37
1828'54.
1829:46
1830'29
1831'40
383 I'53
1832°4′o
1833'23
1834°44.
H 835'43
1836-47
1837-49
1838:47
1839-61
I 84o'43
I 84 I'42
I84. I'43
1842:30
I842°42
1843°33
1844:36
1845°36
1846.29
1847:37
I847°44.
1848-28
1848'50
1851''1 1
1852' 30
1852°38
1852-56
I853'44
1854:46
I 854'48
1854-75
P = 24:12
353'90
34.2°37
335'82
34o 17
337°oo
335'95
334’ I 7
333.68
33 I ‘25
332' I
33 I* Io
33o'72
33O'35
328'98
3.28°17
327°4.
327 Io
324.8
3.24°o8
323°37
324.69
322.67
322°9
322.75
32 I-58
320-88
32O'44
3 19°37
318-83
3 18:04
317-93
3 I 7°43
316.58
316.8
3 I 5°32
3I4'43
31 I'98
3 I2'42
3 II '75
//
D = 3:38
H. “With 460, full 3 diameters of L.”
6 -– H. “Further than ºr Boötis.”
9°25o
7' 54.
8’419
7-776
7, 178
7:217
7.623
7'304
7.3
7° 140
7' 536
7' 542
7:07.0
7:087
7'o
6.850
7.1
7:158
7.268
7°og7
7°o29
6-9
6'702
6'903
6'815
6-690
6-679
6'8o I
6:631
6'713
6'557
6'512
6'5
6.216
6:3 15
6.264
6:067
5'993
H and S on I n.
X with the smaller instruments at Dorpat.
H and S on I n. -
S on 4 n. -
H on 2 n.
2 on 4 n.
H on 5 m. (D on 4).
B on 5 m. with the Königsberg Heliometer.
SM
2 on 2 n.
H on 2 n.
DA on 3 n.
2 on 3 m.
2 on 4 n.
SM
2 on 2 n.
SM
DA on 3 m. with Mr. Bishop's 7-in. refr.
DA on I n. with the same.
M on 4 m. with the Dorpat 9:6-in. refr.
DA on 2 m. with Mr. Bishop's 7-in. refr.
SM
DA on I m. with same telescope and Pr. Cr. M.
M
M.
M on 5 n.
M on 6 n.
DA on 2 n. with 63-in. refr.
M on 5 n. (D on 4).
DA on 2 n.
F on 5 m. with 44-in. refr.
M1, P by 32 obs.; D by 64, with 44-in. refr.
SM “A, deep yellow ; B, flushed purple.”
M on I 5 n.
M. On 8 n.
DA on 3 n, with 73-in. refr. by Al. Clark.
M on 5 n. (D on 4).
DE on 8 m. with 53-in. dialytic refr. by Plössl.
Micrometrical Measurements of Double Stars. 377
No. 1676 = X 1890 = H II. 79 = 39 Boötis.
A fine double star discovered by H in 1783. The earlier measures gave some hope
that this object would prove to be a binary system; and in the note appended to the
observations of H and S it is said; “This is one of the stars, in which there can hardly be
a doubt of a slow change in the angle of position.” But whatever may have been the cause
of the large differences among the results of the earlier measures, more recent ones have
proved that they have not arisen from any relative motion of the components. The
position is very oblique.
wº
1783°o2 P = $16 ; D = ... H. “With 460, near 2 diameters of L.”
1802-67 48:20 ... H
I 822'2 I 4. I'25 3.98 X with 33-in. refr. by Dollond.
1822:51 45°48 4.184 H and S on 2 n. (D on 3).
1828-13 44°oo 3.657 X on 3 n.
183 I-91 44'23 3°753 2 on 3 m.
1834-51 43’9 39 SM
1836.50 44'2O 3757 2 on 3 n.
1839°oo 44'7 3.8 SM
1843-47 44'58 e e DA on 2 m. with Mr. Bishop's 7-in refr. by Dollond.
1847-61 45°3 3.5 SM
1848-51 43.63 3.753 DA on 2 m. with 63-in. refr. by Merz.
1854'74 45°97 3'946 DE on 7 n. with 53-in. dialytic refr. by Plössl.
No. 1680 = O > 288.
In the first Pulkowa Catalogue (1843) this close object, discovered by Mr. OTTo STRUVE,
is marked “Fortasse oblonga.” In the second (1850), the approximate distance is stated
to be = o”5. The only measures I am acquainted with, besides my own, are Mr. OTTO
STRUVE's which he sent me in MS.
1846.8o P = 21532 D = o;30 O > on 5 n. with 15-in. refr. by Merz.
I 847'34. 2 I I-37 o:6 est. DA on 1 n. with 64-in, refr. by Merz.
No. 1681 = 2 1909 = H I. 15 = 44 (i) Boötis.
Discovered to be double by H in 1781. The star is undoubtedly binary; but there is
considerable difficulty in reconciling some of the earlier measures with those more recently
obtained. The distance has been pretty steadily increasing since STRUVE's first measures
in 1819. -
ROYAL ASTRON. SOC. VOL. XXXV. 3 C
378
Rev. W. R. DAWES, Catalogue of
1781-62
1802-25
I 81.9°43
1821.33
1826.79
1829:20
1830'44
1830°53
1830.82
I83 I'34.
1832°56
1832.95
I833'39
I 834°55
I 83459
1835' 51
1836-58
1836.66
1836-71
1837.75
1839.62
1840°58.
1841-48
I 842°40
1842-58
1842 '71
1842-78
1847°og
1847-32
1847°45
1848-49
1849'48
1851.27
I 85 I'47
1851-52
1851.87
1852-65
1853'28
1853-64
1854-69
I 854°74
G
P = 6o'Io .
62.98
228°oo
229' 12
23 I Go
233.65
23 I’ I 5
234.62
233.8
232'98
235'30
234'47
235'65
235' I
235-67
235'23
235'92
234'87
2.34°9
2.36°oz
235' 3
235'72
2.36°oo
235-60
235'9
235'88
237: 17
237'99
236' 12
236.2
237-70
237.27
237'o6
237'95
236-74
238-12
237.96
24o'23
237°45
239°7 I -
237.77
D =
//
I 5 est.
2.277
2°23o
2°555
2.708
2'990
2-9
2'974
3' I 20
2.963
3.28o
3°3
3'445
3' 172
3,763
3'30o
3'390
3'5
3.862
4."OO4.
3-84. I
3.7
3°790
3’9 II
4.261
3.886
4.' I
4°2 Io
4’364
3'998
4'268
4'498
4° 187
4'256
4'349
4°257
4448
4'584
H “With 460, or 3 diameter of S.”
H “With 460, barely 3 diameter of S.”
> with the smaller instruments at Dorpat.
H and S on 2 n. (D on 1) with 33-in. refr.
> on I n. with 9.6-in refr.
2 on 2 n. -
DA on 1 n. with 3.8-in. refr. by Dollond,
H on 1 m. with 5-in. refr. by Tulley.
SM -
DA on 4 n. (D on 2) with 3.8-in. refr.
DA on 3 m. with same telescope.
2 on 3 m.
DA on I n. with 3.8-in, refr.
SM
DA on 4 m. (D on 2). On 2 m. with 3.8-in, refr.
and on 2 with 6'3-in. Herschel-Newtonian.
X on 6 n.
DA on 2n. (Don 1) with 6'3-in. Herschel-Newtonian.
2 on 4 n.
SM
2 on 4 m.
SM
DA on 5 m. with Mr. Bishop's 7-in, refr.
DA on 4 n. (D on 3) with same telescope.
DA on 2 n. (D on I) with same.
SM -
DA on 1 m. with same telescope, and Pr. Cr. M.
M on 2 n.
HI on 2 n. (D on 1) with Mr. Bishop's 7-in. refr.
M on I n.
SM
DA on 3 m. with 63-in. refr. by Merz.
DA on 1 m. with Same.
M on 2 n.
F on 4 m. with 44-in, refr. by Cooke.
DA on I n.
M on 9 n.
M on 15 m.
MI, P by 39 obs., D by 82.
M on 7 n.
DE on 13 n. with 53-in. dialytic refr. by Plössl.
DA on 1 m. with 73-in, refr. by Al. Clark.
Micrometrical Measurements of Double Stars. 379
No. 1699 = X 1931.
Discovered by X; and was one of the list proposed by his son for comparison of measures.
1832'2 I P = 1735. D = 13092 2 on 4 n.
1844-92 172.80 13'16o O > on 3 n. (D on 2).
1849.79 I 72° 13 13°208 DA on 3 n.
No. 1702 = X 1932 = Coronae Bor. 1 (B).
An elegant and nearly equal double star discovered by X, who suspected the relative
magnitudes of the components to be subject to a slight variation. My own measures com-
pared with earlier ones by X and H convinced me that the star possessed a binary character,
the angle having considerably increased, while the distance may very likely have rather
diminished. We have the following results for comparison:—
1830:28 P=27#85 D = *622 > On 4 n.
1830'29 268’44. 1.534 H on 3 m. with 5-in. refr. by Tulley (Z + 180°).
1831:37 267:35 1:31 o H on I n with same (Z + 180°). -
I 833'39 271-23 I'445 DA on I n. with 3.8-in, refr. by Dollond.
I 842°42 278-65 1 500 M on 2 n.
I 848-49 28 I o8 1.464. DA on 2 n. with 63-in. refr. by Merz.
1851-88 283.67 I'456 M on 4 n.
1854'4o 284'oZ 1'360 DA on 1 m. with 73-in, refr. by Al. Clark, and
Sph. Cr. M.
This star is evidently worthy of continued attention.
No. 1706 = X 1937 = H I. 16 = n Coronae Borealis.
One of the most interesting of the known binary systems, both from its extreme closeness
and from its rapidity of revolution, its period being about 42 years; so that, in the year
1866, it will have performed two complete revolutions since its discovery by H in 1781.
There seems therefore to be no doubt now that the position he assigned to it in 1802 should
be sf instead of n p: a mistake which from the near equality of the components might
easily be made. As might be expected, this interesting object has been much attended to
by those astrometers who possess competent instruments. The following selection from the
numerous results will give a pretty clear idea of the course pursued,
P = 3068 D = ... H. “With 460, less than 4 diameter.”
179-67 ... H (Z — 180°).
1781-69
1802-69
38o
Rev. W. R. DAWEs, Catalogue of
1823-27
1826-77
1829'55
1830:30
1830°36
I83 I'34.
1831'47
1831:63
1832° 5o
1832° 55
1832-63
1832.76
1833'39
1833'57
1834-60
I 835°41
1835.65
1836-52
1836.59
1837-47
1837-68
1838; 19
1838-44
I 839°59
1839'67
I84o'52
1840.62
1841'54
1841.65
1842'26
1842:58
1842-69
1846-69
1847'o8
I 847-24
1847.32
1847-78
1848. 18
1848°34
1848-47
1849-44
1850-56
o
P = 25'95
35-28
43°25
44°49
50-77
52'68
50-63
57° 14
5670
57.2
56-87
63-52
61.9
68. I
74°28
75'2
88-77
89.2
95°44
I O2' 3
Io9'9
1 oz'O4.
119.8o
I 2 O' I
136'52
135°88
I 5 o'34.
I49'4.o
157.62
156-63
163’51
188: 5
196'58
I9992
I99'22
2O5°33
2O5’75
2O4'44
2O7°43
2 I 8:28
235°oo
1/
D = 1.577
I'oZ 5
o'960
o'817
H and S on 2 n. (D on I n. with 5-in, refr.)
2 on 4 n.
X on 2 n.
H on 8 n, with 5-in. refr. by Tulley.
H on 4 m. with same.
DA on 2 n. with 3.8-in. refr. by Dollond.
o'883
O' 8
o'790
o' 8
o°6
o'73o
o°6
o' 563
o' 5
o' 385
o' 5
o' 5
o:366
o’ 5 est.
o' 5
o' 524.
o'5 est.
o' 59 I
o°495
o' 55o
o'5 est.
o' 553
o°3
o'63 est,
o:687
o°598
o:629
o:652
o:692
o:694
o:7 est.
H on Io n, with 5-in. refr.
X on 3 n.
H on 9 m.
DA on 1 m. with 3.8-in, refr.
SM
2 on 3 n.
DA on 3 n.
SM
SM
X on 6 n.
SM
X on 6 n.
SM
2 on 4 m.
SM
SM
2 on 5 m. *
DA on 2 m. with Mr. Bishop's 7-in. refr. by Dollond.
SM
O X with 15-in refr. by Merz, at Pulkowa.
DA on 2 n. with Mr. Bishop's 7-in. refr.
M on 9 m. with 9-6-in. refr. at Dorpat.
DA on 6 m. (D on 1) with 7-in, refr. at S. V.
M on 5 n.
DA on 2 m. with same telescope.
M on 4 n.
SM
HI on 3 m. with Mr, Bishop's 7-in. refr.
DA on 2 n. with 63-in, refr. by Merz.
M on 12 n.
M on 4 n.
M on 3 m.
DA on 2 m. with 63-in, refr. and P. W. M.
DA on 1 m. with same telescope and Sph. Cr. M.
DA on 2 n. (D on 1) with same and P. W. M.
F on 2 m. with 44-in, refr. -
Micrometrical Measurements of Double Stars. 381
1850-70
1851'42
1851.68
1852'43
1852-52
1852-65
1853:20
1853' 35
1853-64
1854°oA.
1854'42
1854*73
O
P = 228.78
238°og
235°4O
246.8
25 o' I 4
25 O'74
257.86
267-8o
273°34.
285'3 I
3OI’47
317'o'7
D = 34.17 M on 3 m.
o' 55o DA on 2 m. with 63-in. refr.
o:365 M on Ion. (D on 7).
o' 5 SM
o°5 est. DA on 2 m. with 63-in. refr.
o:273 M on 13 n. (D on II).
o'4 est. J on 2 n. with 6'3-in. refr. by Lerebours.
o'27o M on 5 n.
o'44est. DA on 4 m. with 6%-in. refr.
o°5 est. J on 3 m. with 6'3-in. refr.
o°471 D on 3 with 73-in. refr. by Alvan Clark.
o°26 M on 4 n. (D on 3).
No. 1735 = 2 1938 = H I. 17 = P XV. 74 = p, Boötis.
A very close and highly interesting binary star; and as appears from the common
proper motion, physically connected with the fourth-magnitude-star to Boötis, though at
a distance from it of about 1' 48" 5.
The distance of the close pair has of late years been
considerably and rather rapidly decreasing, and the retrograde motion in position much
accelerated. Great attention has been paid to this object by those astrometers whose in-
struments were competent to deal with it; and the following selection from their results
will show the variations which have taken place since its discovery by H in 1781.
1782.68 P = 35723 D =
18oz'66
I822*2 I
1823°41
1825'46
1826-77
1829-73
I 83 o'24
1832°3 I
1832° 56
I833'39
1833'85
1834-56
I835. 55
1836.65
1837'29
1837-37
1837-70
346’23
33O'7O
333°7'O
333'53
327°oo
3.24°o 5
324' I 2
32 I ‘4
322:72
3 1978
3 1970
3 Ig'90
318:63
3 I 5 of
3 I4'8
3 14-87
3 I 5°oo
H “With 460, # diameter of S (in 1781).”
H -
> with the smaller instruments at Dorpat.
I-652 H and S on 3 m. with 3; and 5-in. refr.
I'421 S on 5 m. with 5-in. refr. at Passy.
1.385 X on 2 n. with 9.6-in. refr. by Fraunhofer.
I'245 2. On 2 n. -
o'854 H on 2 m. with 5-in. refr.
I'3 SM
1'o68 H on 3 m. with 5-in. refr.
1’ I 50 D on 1 n. with 3.8-in. refr.
I 190 X on 3 m.
I*2 SM
I. Io9 X on 3 m.
I'o6o X on 3 m.
I "O SM
I'o est. DA on 1 m. with 3’8-in. refr.
o'90 2 on 1 n.
382
Rev. W. R. DAWEs, Catalogue of g
1839'32 P = 3166
1840'39 306'oo
I841'47 308-72
1841-66 3O3'23
I 842°4′o 3oo’97
1842°4′o 305-18
1842-66 3O4'94.
1842°52 306.1
1843’54. 3o I 55
1847°o8 281.29
1847'30 286 52
1847.38 287-78
1848.38 282'44
1848-52 28o'o6
I849-44 276-20
1850-70 276.73
1851.28 264-96
1851'42 266-56
1851.78 263-22
1852'52 262'22
1852.61 261'24
1853'23 265'14
I 853'49 256.25
1853'60 255°o
1853-71 254:63
1854°o; 255°74.
1854'41 249' 30
D = oš
o:830
o'825
o'859
o'85 est.
o'717
o:785
O'8
o:760
o'65 est.
o'479
o'82O
o'65 est.
o:682
O'4o
o:317
o' 525
o'338
O'55 est.
o°41'5
o'45 est.
o:350
o' 5 est.
o' 5 est.
o' 5 est.
o'467
SM
DA on 3 m. with Mr. Bishop's 7-in. refr. by Dollond.
M on 2 n.
DA on 6 n. (D on 3), with same telescope at S. V.
DA on 3 m. with same.
M on 3 m.
M on 2 n.
SM
M
HI on 2 n. with Mr. Bishop's 7-in. refr.
DA on 4 n. with 63-in. refr. by Merz.
M on 15 m.
M on 2 n.
DA on 4 m. with same telescope.
DA on 2 m. with same.
M on 3 n.
M on 3 Il.
DA on 2 m. with same.
M on 4 n.
DA on I m. with Same.
M on Io n.
J on 2 m. with 6'3-in. refr. by Lerebours.
M on 6 n. -
SM
DA on I n. with 63-in. refr.
J on 2 n. with 6'3-in. refr.
DA on 3 n. with 74-in. refr. by Alvan Clark.
No. 1765 = O > 296.
A close double star discovered by Mr. OTTO STRUVE, who has sent me his own results.
Prof. MÄDLER has also measured it, but I am not aware of any other observations.
1845-53 P = 326°25 D = 146; O X on 2 n.
I '824 M on 2 n.
I'597 DA on I n. with 63-in. refr.
1846-80
1848-53
328:88
3.25°23
No. 1766 = X 1950 = Coronae 17 (B).
By comparison of my results with those of STRUVE who discovered its duplicity, there
is no reason to suspect any alteration in either the angle or the distance of this object.
Micrometrical Measurements of Double Stars. 383
D = #207 2 on 4 n. * .
3.263 DA on 2 n. with 63-in. refr. by Merz.
- O -
P = 93:17
92.82
1830:28
I849°44
No. 1768 = X 1964 = H I. 42 = 3 Serpentis.
From a comparison of the more recent measures of this beautiful double star with those
of H, there seems to be sufficient evidence of a slow retrograde motion in position, with
scarcely any variation in distance. The star, being remarkably easy of measurement, has
been abundantly observed. The following selected series will suffice for comparison.
//
H “With 460, near 3 diameter of S.”
1782'99 P = 227:20 D =
I 8oz. Io 208-55 H
182 I 33 199°38 3'o;3 H and S on 1 n. with 33-in. refr.
1822.68 2O I*2 O 2'44, 2 on 3 m. with the smaller instruments at Dorpat.
1825-46 2Oo'I 8 3.268 S on 6 n. with 5-in. refr. by Tulley.
1829'50 198’40 3.292 H on 6 n. (D on 4; a fifth = 4".62 rejected in
computing the mean.)
I 83 I ‘43 196'5 29 SM -
1832'3 I 198:45 3'o48 H on 2 m. with 5-in, refr.
1832°35 198-92 2.916 DA on 3 m. with 3-8-in. refr.
1833'o'7 197:28 2:662 > on 5 n.
1836.30 196'93 2'567 2 on 3 m.
1838°38 I 97'3 2:7 SM
1841'o6 I95'73 2.971 DA on 5 m. with Mr. Bishop's 7-in. refr.
1841' 3.2 197°47 3:469 M on 5 n, (D on 3). -
I 842'35 1962 2°8 SM
1842-37 196’ I 5 3'o42 M on 4 m. (D on I).
I843'44 195'87 2.854 DA on I n. with Mr. Bishop's 7-in. refr.
1845'27 I94'25 3'o26 HI on 3 n. (D on 2) with same and Pr. Cr. M.
1848-52 I94'93 3'oo8 DA on 3 m. with 63-in. refr. by Merz.
I 849'44 I 94°o8 3°og4 DA on 2 m. with same.
1851'32 196'5 3°o SM
I 852'34. I94’3 I 3.286 M on 2 n.
1852'58 194-26 3°o 33 DA on 2 n.
1854:20 195'98 3’ I 50 DE on I I n.
1854'55 I93' I 3 3' 126 M on 3 m.
The differences in the measured angles are large for so easy a star, and considerably
increase the difficulty of determining its real character. They are the more surprising, as
the position of the star is not far from the vertical : yet between the two last sets in the
above series, by DEMBOWSKI and MÄDLER, the difference at nearly the same epoch amounts
384 •.. Rev. W. R. DAWEs, Catalogue of
to no less than 2°85 ! Generally, however, the measures at different epochs by the same
observer show a very decided diminution of the angle: while the distance cannot have varied
perceptibly.
No. 1781 = O > 298.
Of this close double star I obtained a few measures for comparison with the result
of Mr. OTTO STRUVE's observations which he sent me in MS. Prof. MADLER's are the
only measures beside these that I am acquainted with.
1846'49 P = 18383 D = #193 O X on 3 m.
1846-81 187'55 I'451 M on 4 n. (D on 3).
1848.68 185'82 1231 DA on 1 m. with 63-in, refr, and Sph. Cr. M.
No. 1782 = X 1965 = H II. 8 = & Coronae Bor.
A fine double star, discovered by H in 1779. Notwithstanding a difference of 5° between
the more recent measures and those obtained by H, there seems to be no sufficient reason to
conclude that any real variation has occurred in either position or distance. The measure-
ments are extremely easy, except that the somewhat oblique position may demand especial
caution to obviate its effects.
1781-70 P=295%; D=5468
H. Dist. a mean between 4".687 and 6"-25, including both
diameters.
1822:30 3oo’95 7 168 H and S on 4 n. (D on 3).
1822-66 299-60 5.88o X with the smaller instruments at Dorpat.
1829.70 3oo'86 6'ooz > on 5 n. with 9-6-in. refr. by Fraunhofer.
1831-61 3o I ‘2 6-4 SM *
1832°57 3oo 5o 62oo H on 1 m. with 5-in. refr. “A most superb set of mea-
sures.”
1839'50 3oo’9 6'5 SM
1841°47 3oz. 18 6'o68 M on 2 n.
1841-66 3ol. 27 6'194 DA on 1 n, with Mr. Bishop's 7-in, refr.
1842'57 3o I ‘2 6. I SM --
1843-63 3oo'78 6,209 DA on 1 m. with 7-in. refr. and Pr. Cr. M. at S. V.
I 844' I 5 3o I'70 6-ol 8 O > on 9 n, with 15-in. refr. by Merz. Communicated in MS.
1848-45 3O I ‘35 6.201 DA on 1 n, with 63-in. refr. and Sph. Cr. M.
1848-48 3O I ‘43 6.130 DA on 2 n. with same telescope and P. W. M. .
1852:49 302-22 6°og 3 M on 4 n.
1853-83 3oz.62 6-153 DE on 6 n.
I854' 55 3oo'88 6.285 DA on 1 m. with 73-in. refr. by Alvan Clark.
1854-65 3o I 3o 5'898 M on 2 m.
Micrometrical Measurements of Double Stars. 385
No. 1788 = X 1967 = y Coronae Borealis.
One of the most difficult and interesting of the double stars detected by X. It is
undoubtedly binary ; but the plane of the orbit so nearly coincides with the line of sight
that the smaller star passes across the larger, and for three or four years together so nearly
coincides with it that even with telescopes of large aperture the star appears single.
The following series will convey some idea of the movements which have been already
detected, and of the difficulty of obtaining any trustworthy observations.
1826.75 P=1 lio; D=4725 > on 2 n.
1828.98 I Io'70 o' 54o 2 on 3 m.
1832-66 I O2 '94 o'4 est. 2 on 5 n.
1835–1838 Single. X
1841 50 332° 3O o' 184 M on Io n.
1842.8o 271-96 o'47.5 M on 2 n.
1843°45 288-88 o:6 est. DA on 1 m. with Mr. Bishop's 7-in. refr. by Dollond.
1851 5o 28.2° 2 o o' 53 o O >, with 1 5-in. refr. by Merz at Pulkowa.
1851.70 292°23 o'4o est. M on 6 n.
1852'o'7 285'o6 o'57 est. DA on 4 n. with 63-in. refr. by Merz.
1852'60 296'4o o'458 M on 7 n. (D on 6 est.).
1853'2O 294°29 o' 5 J on 2 m. with 6'3-in. refr. by Lerebours.
1853'32 284.46 o'4o est. M on 4 n. (D on 3).
I 854'4o 284'30 o:693 DA on 2 m. with 74-in. refr. by Alvan Clark.
1854.76 29 I of O'4 est. M on I n.
It is an extraordinary circumstance that the magnitude of y Corona, having been set down
in PIAzzi's Catalogue of 1814 as the sixth, that magnitude was adopted for this star in the
R.A.S. Catalogue, notwithstanding the agreement of FLAMSTEED's and other previous Cata-
logues in assigning to it a much higher magnitude. In BoDE’s edition of PIAzzi's first Catalogue
the magnitude is given as 4.5, and appears to be taken from PIAZZI. LALANDE has estimated it
twice of the 4th and once of 43. STRUVE has noted its magnitude in every instance as the
4th. ARGELANDER has assigned to it in his notation 4.3 (or decimally 37), as he has also to
6 Coronae. I have been well acquainted with the principal stars in this elegant constellation
for fifty years; and during the whole of that period any perceptible difference in the brightness
of 3 and y could scarcely have escaped observation. And indeed the reduction of this star to
the 6th magnitude, or even to the 5th, would so alter the appearance of the constellation as
instantly to attract the attention of any one acquainted with it. It is therefore really astonish-
ing that it should have been entered as of the 6th in the Catalogue of the R.A.S., and (as
a sort of compromise apparently, after its real magnitude had been strongly insisted on by
myself,) of the fifth in the Catalogue of the British Association. The result of these inconsis-
ROYAL ASTRON, SOC. WOL, XXXV. 3 D
386 Rev. W. R. DAWEs, Catalogue of
tencies is obviously to give the star the character of a variable; for which there does not
appear to be the slightest foundation. The 6 in PIAZZI's Catalogue is no doubt simply a
typographical error for 4.
No. 1797 = 2, 1998 = H I, 33 = % Scorpii, A B.
Much confusion has arisen in the angles registered by different observers at different times,
caused apparently by variability in the relative magnitudes of the components. It seems to
be certain that the position observed by H in 1782, which he assigns to the n.f quadrant
requires to be increased by 180° to render it comparable with the observations of STRUVE
and most other more recent astrometers; and the same seems to be necessary in the case of
SouTH's measures at Passy. On the eight nights on which he noted the magnitudes of the
close pair he has assigned to A and B the following figures:–7, 7; 7, 7; 6, 7; 6, 6% ; 7, 7} :
7, 74; 8, 84; 8, 84. In every instance however he has judged the southern star to be either
equal to the northern, or smaller; and has consequently placed the angle in the s.f. quadrant.
At the very same time STRUVE judged the northern star to be the smaller; and on the three
nights of his observations in that year (1825) he calls A (the southern) 5, 5, and 4% ; and B
(the northern) 53, 5}, and 5. As the star is very obvious to the naked eye, it is clear that
the highest magnitude assigned by SouTH is much too small, as is frequently the case.
STRUVE's mean is 4.9 and 5°2,-making about 4% together. ARGELANDER, in his admirable
work entitled Uranometria Nova, has set it down as 4.5 ; which in his notation is equal to
about 4:3 expressed decimally. He has also, with his usual accuracy, restored this star, at
well as y, to Scorpio; both of which, by a palpable mistake of FLAMSTEED's, were included in
Libra,-the former as “51 (£) Libra,”—the latter as zo Librae. That FLAMSTEED's error
should have been so generally followed is much to be regretted, as it has produced no small
confusion. Even STRUVE has termed the star now under consideration “à Librae,” though
there were already at least two stars so designated in that constellation, viz., F.L. 13 Libra–é,
and FL. 15 = É, ; and FL. 17 and 18 have apparently been noted as #, and #4; or at any rate
they form part of the group. Mr. BAILY remarks on it, “It is the 4 Scorpii of BAYER, and
consequently ought not to have been introduced into this constellation.” And Admiral SMYTH,
in The Cycle, remarks, “In fact, this star is & Scorpii, and consequently ought not to have been
jumbled into the Balance.”
For comparison of the movements of 4 Scorpii we have the following.
1782.36 P=18794 D= ".. H (Z +180°). “With 460, 4 or at most $ diam, asunder.”
1825'47 335'97 I'147 2 on 3 n. -
1825'49 35 I'90 1'358 S on 8 m. with 5-in. at Passy (Z +180°).
1830-27 I ‘5 I I:496 H on 4 n. with the same 5-in. refr.
1831 38 9°25 1.320 H on 2 n. (D on 1), with same.
1832°46 4' 4-3 I'213 2 on 3 n.
I833'39 6:20 I I 5 o DA on 1 m. with 3.8-in. refr. by Dollond.
Micrometrical Measurements of Double Stars, 387
1833'91 P = 5%; D = #21; X on 2 m.
I 834'42 6-6 . I “4. SM
1834' 50 7-83 1' 166 DA on 8 m. with 6'3-in. Herschel-Newtonian.
1834°52 5°92 ... DA on 2 n. with 3.8-in. refr.
1835°oo 7-70 I'235 X on 2 n.
1835-40 I o'o.8 1:41 o H on 8 m. with 5-in. refr. at the Cape.
1836-49 8°o 8 I'162 X on 4 n, -
1837'51 12.5o I'ogo X on 2 n.
1838.60 13°3 I “I SM
1839-61 1674 1.278 DA on 2 m. with Mr. Bishop's 7-in. refr,
1840'56 18-64 I 191 DA on 3 m. with the same.
1841'48 16.73 I'28o M on 4 n.
1841'58 1898 I 198 DA on 3 n, with the same.
1842°42 zo'41 I'ojo M on 4 n. (D on 2).
1842-46 2 I ‘59. ... DA on 2 n. with the same.
1842:56 23'5 I* 2 SM
1843°40 23°55 1'o69 DA on 2 m. with same and Pr. Cr. M.
1843-45 24' 58 ... DA on 1 n, with same and P. W. M.
1846-49 24°9 1°o SM -
1848'54 , 30°55 1' 194 DA on 3 n, with 63-in. refr.
1852'98 46'52 o:931 J on 3 m. with 6'3-in. refr. by Lerebours.
1853'53 46:28 ... DA on 1 m. with 63-in. refr.
It is evident that up to this date the orbital motion has been considerably accelerated, and
the distance decidedly diminishing; and it will, no doubt, ere long require the most powerful
optical means to fairly separate the components. º
*** and C.
2
No. 1815 = X 1998 = H II. 20 = } Scorpii
Though the angles obtained by STRUVE and other observers differ considerably from that
recorded by H in 1782, there is room for doubt whether we really have here any orbital
motion. The differences among the results are certainly rather large for an object whose
distance is 7"; arising probably from the duplicity of the large star, from which the mea-
sures are taken. Yet during the last sixteen years of the following series scarcely any
change seems to have occurred. We have the following results for comparison. -
1782.36 P=8&62 D=6482 H. “Distance too large.”
1822:46 78-38 6.769 : H and S on 2 m. with 33-in. refr. “The large star not
seen double.” -
1825-46 76.63 7:070 S on 4 n. (D on 3), with 5-in, refr. by Tulley.
388
R. DAWES, Catalogue of
Rev. W.
1825'48 P = 7&60 D=6750
1828:40
1832°46
I 834°42
1835°oo
1836-49
1838.60
1840: 56
I 84.1 °47
1846-49
1852'22
78-63
76.17
76.1
75°4o
74'70
74°2
69'45
74.67
68. I
74.7
6'95o
6:700
7.2
7'ozo
7'o67
7.2
7'435
6.753
7:o
6'99
> on 4 m. with 96-in, refr.
H on 3 n. (D on 1), with 5-in. refr.
2 on 3 m.
SM
X on 2 n. .
2 on 3 n.
SMI
DA on I n. with Mr. Bishop's 7-in. refr.
M on 2 n. -
SM
X on I n. with 15-in. refr. by Merz, at Pulkowa.
No. 1816 = X 2021 = H I. 82 = 49 Serpentis.
A pretty double star discovered by H in 1783; and from comparison of all the results
there can be little doubt that it is a binary system.
1783-18 P=29#55 D="..
1802°39
1804'25
1822.87
1825'41
1830°o8
1831 “40
I 832°43
1832.70
1836-32
I 839'29
1841' 3.2
1841°38
I 842°40
1845'26
1849'44
1851'4o
1851-66
1854-62
1854:63
3oz'87
305° 17
3 I 3°75
318: 17
317° I 3
3.1484
317.8
316-69
316'73
318: 1
3 19°2O
318°o 5
32O'5o
318'90
321-27
322°22
322'93
322'36
32 I*22
4°2 I 5
3'50 I
3°o II
3' 169
3°7
3' I 99
3.28o
3°3
3.868
3°434.
3°4o
3°232
3:387
3'248
3’5 I 7
3:669
H. “With 460, # diameter” of either star.
H
H
H and S on 2 n. with 33-in. refr.
S on 4 m. with 5-in. refr. “A = 8; B = 8%.”
H on 2 n.
DA on 2 n. (D on 1), with 3.8-in. refr.
SM. “A, 7, pale white; B, 7}, yellowish.”
> on 8 n. “A = 6.7; B = 6.9. Albaº.”
2 on 3 m.
SM
M on 5 m.
DA on 1 m. with Mr. Bishop's 7-in. refr.
M on 3 n. (D on 1). -
HI on 2 m. with Mr. Bishop's 7-in. refr.
DA on I n. “Both white,”
M on I n.
F on 2 n. “A, white; B, yellow.”
M on 4 n. (D on 3).
DE on 6 m. with 53-in. dialytic refr.
Micrometrical Measurements of Double Stars.
389
No. 1818 = X 2032 = H I. 3 = a Coronae Borealis.
A highly interesting binary star, discovered by H in 1780, who observed a change of
O //
1781-79 P=347-53 D=
180474
1819.62
1822-83
I 825'44
1827'oz
1828'50
183 o'1 1
1830:28
1830.76
1831:36
1832-37
1832°52
1832° 55
I 832'99
1833°26
1833'36
1833'58
I 83455
1835°50
1835°50
1836'59
1837°47
1837'55
1838:45
I 839'53
1839-67
184o 57
1841-48
1841'56
1842'3 I
1842°37
1842-73
II "40
48°oo
7 I'55
77' 52
89:35
92 Io
IO4'90
Io;'o8
107.6
108-76 -
I I4'9
II 3’55
II 5'4o
I I 8:8o
I IQ-9 I
I 20.62
12o.7
125-60
I 3o'46
I 3 o'9
I 34°73
I 36-85
I 39.96
143'36
I 44' 33
I 45' I
I 47.85
I 5o'32
I 52'28
I 56-37
I 53°27
I 57°59
I'445
I'48o
I ‘3 I2
I "22O
I ‘223
I'3
I'38o
I'4.
I'oZo
I'297
I'330
I 3 oo
I "2
1:308
I ‘4.
I ‘435
I'418
I'48o
1:600
I-6
1.658
angle amounting to 24° in twenty-three years.
accelerated, as will be seen by the following series.
H. “With 460, 2 diameters of L.”
H **
X with the smaller instruments at Dorpat.”
H and S on 2 n. (D on 1), with 3.8-in, and 5-in. refr. (D
with 5-in.)
S on 6 n. (D on 3), with 5-in, refr.
Af
1.657
I '599
I’8 Io
1867
X on 4 m. with 9-6-in. refr.
H on 6 m. with 5-in. refr.
> on 3 n.
H on 9 n. (D on 5).
SM
H on 3 m. (D on 2).
SM
H on 6 n. (D on 1). -
DA on 3 m. with 3.8-in. refr. by Dollond.
2 on 3 n.
H on 3 n. (D on 2).
DA on 4 m. with 3.8-in. refr.
SM
DA on 3 m. with 6'3-in. Herschel-Newtonian.
2 on 5 n.
SM
X on 6 n.
DA on I n. with 3.8-in. refr.
> on 5 n.
X and O > on 7 n.
DA on 1 m. with Mr. Bishop's 7-in, refr.
SM
DA on 3 m. with same.
DA on 3 m. with same.
M on 7 n.
M on 4 n.
DA on I n. with same.
M on 4 n.
Since then its orbital motion has been greatly
390
Rev. W. R. Dawes, Catalogue of
G) - 4/ -
1843.35 P= 155°9 D = 1°8
SM - -
DA on 1 n. with 7-in. refr. and Pr. Cr, M. at S. V.
1843°47 156.50 I'774
1846'46 165°o8 2'o'73 M on I I n.
1846-60 1624 2 *O SM
1847'44 - 166-58 2' 164 M on 14 n.
1847:44 166°oo 1885 DA on 2 m. with 63-in. refr. by Merz.
1848-41 168°37 2: 396 M on 2 n. (D on 1),
1848°53 168-63 I'995 DA on 3 m. with same,
I 849'45 17o Io zºog I DA on I n, -
1850-70 173°oz 2-235 M on 2 n.
1851-22 174.38 2.319 F on 6 n. (D on 3), with 44-in, refr, by Cooke.
1851'25 I 74°53 2:344 M on 6 n.
1851'42 173.81 2-265 DA on I n.
1851.76 176'24. 2°439 M on 9 n.
1852:25 176.8 2°2. SM
1852' 31 17645 2.383 MI, P by 24 obs, D by 38, with 44-in, refr. by Cooke,
1852'60 177°53 2: 395 M on I I n.
1853' I4. 17790 2-181 J on 2 n. with 6'3-in. refr. by Lerebours.
1853.38 177,70 2:46.1 M on 6 n. -
1853-63 177-87 2: 388 DA on 4 m. (D on 3), with 63-in. refr,
1853.77 178°75 2’650 M on 2 n. -
1854°o; 177-87 2.247 J on 3 m. with 6'3-in. refr.
1854: 56 178°46 2.257 DA on 3 n. with 73-in. refr. by Alvan Clark,
1854'70 I 79°44. 25 15 M on 5 m. -
1854.86 179'85 2.369 DE on 8 n, with 53-in, dialytic refr. by Plössl.
No. 1842 = & Scorpii or Antares,
The close companion of this beautiful star was discovered about the year 1846 by Prof.
O. M. MITCHELL, of the Cincinnati Observatory, with the fine 1 13-in. refractor by MERz.
Soon after I had heard of it, I turned upon the object my 63-in. refractor by the same maker,
and succeeded in measuring both the position and distance on several nights in 1847-8 and 9.
Up to the end of 1854, I am not acquainted with any other micrometrical measures than my
own. I have noted the colour of the small star rather differently on different occasions, viz.,
as blue, purple?, purplish, very blue, and green. It is probable that in a star at so small an
altitude, the various conditions of the atmosphere may cause the colour to vary in some degree.
The large star has always been called red. (See Appendia. and Note on No. 2657.)
Micrometrical Measurements of Double Stars. 39 I
No. 1847 = O > 312 = n Draconis.
The delicate companion of this star was discovered by Mr. OTTO STRUVE at Pulkowa;
and as its magnitude is noted by him as not much below the 8th, it is surprising it was
not seen before. We have the following for comparison.
1844'81 P = 14;'42 D = £620 O > on 6 n. (communicated by letter),
1847°4 I I4 I ‘42 4,711 DA on I n, with 63-in, refr. by Merz,
1852.72 I 45°o 5 -
4'ooé M on 3 m. (D on 2).
No. 1848 = X 2055 = H I. 83 = A Ophiuchi.
This close, beautiful and very interesting binary system, was discovered by H in 1783,
who calls “L, white, and S, blue ; both fine colours.” But, though he describes them as
“considerably or almost very unequal,” one of the angles of position he gives seems to require
to be increased by 180°. Judging by the rate of progression of late years, it appears most
probable that it is the measure taken in 1802, which requires to be so increased. This,
however, would leave an orbital movement of 173°8 to be performed in 192 years, at a
mean rate of 9° per annum; while in the next 23 years, from 1802 to 1825, the angle
described would be only 82°48, at the rate of 3°57 per annum. Under these doubtful
circumstances it may be well to quote the original angles; leaving it to future observations
to determine the true period, and to rectify any errors in the angles first obtained.
1783-18 P = 7; so? D = ".. H, “With 460, 4 or 3 diameter of S.”
18oz'39 69'32? - © H
1825' 51 33 I '8o o'837 2 on 3 m,
1828'51 342" Io o'813 2 on 3 m.
183 I'37 337'72 ... H on 4 m, with 5-in, refr. by Tulley,
1831 '90 34.9°47 I'O43 > on 2 m.
1832°57 347°5 I I'oZ3 H on 4 m. (D on 2).
I 833°33 347'87 I ‘oo7 H on 3 n, -
I 834'42 35o'60 o'987 2 on 2 n.
I 834'48 35 I'2 I 'O SM
I 834°55 349' 55 o'932 DA on 6 n. (Don 2) with 6'3-in. Herschel-Newtonian.
I 835'55 352'48 o'990 2 on 5 m. -
1836.50 353.38 I'ol 4. 2 on 5 m.
1836:51 352'9 I "I SM
1837'59 356.85 I'o.3o X and O X on I n.
1837.68 354'85 1.178 DA on 1 m. with Mr. Lawson's 7-in. refr. by
Dollond at Hereford.
1839.67 356'5 I'o SM
392 * Rev. W. R. Dawes, Catalogue of
I 84o'54 P = 3 58% D = #ozz DA on 3 n. (D on 1) with Mr. Bishop's 7-in, refr.
I 84.1 °54 359'4. I 1’ 138 DA on 4 n. (D on 2) with same.
1841'59 2-8o 1.292 M on 7 n. (D on 5).
1842:38 I-61 I I 14 M on 5 n.
1842'50 I'4. I • I SM *
1842:58 359'40 1. Io9 DA on 3 n. (D on 2) with Mr. Bishop's 7-in. refr.
1843°47 I •6o ... DA on 2 n. with same. * -
I 843°41 o'3o I'o95 DA on 1 m. with same telescope and Pr. Cr. M.
I 847°43 Io:37 1' 179 M on 4 n.
1848-47 8.85 1,244. DA on 2 m. with 63-in. refr. and Sph. Cr. M.
1848.85 896 1.262 DA on 7 n. with same and P. W. M.
1850'58 I2'99 I 'o';2 M on 4 m. (D on 2).
1851.36 12.72 - I " 2 F on 5 n, with 44-in. refr. by Cooke.
1851-40 14-81 1.256 M on 1 m.
1852-57 I 5'96 I'o6o M on 8 n.
1852-67 12-60 1:2 Io J on 3 m. with 6'3-in, refr. by Lerebours.
1853'25 . I 5'5 I ‘2 SM
1854'o6 I 5’25 1.359 J on 3 m. with same telescope.
I854. I4. I4°oo 1.311 DA on 4 m. with 63-in. and 73-in, refr.
1854:63 17.86 I’og 5 M on 4 n. (D on 3).
No. 1875 = O > 313.
A very close double star discovered by Mr. OTTo STRUVE with the Pulkowa telescope.
I observed it for comparison of my results with his. The only other observations I am
acquainted with are by Professor MÁDLER.
O //
1846'30 P = I 55-83 D = o'795 M on 4 n.
1846'42 157° 38 o'85 o O > on 4 n.
1847°41 I 59' 58 o'935 DA on I n.
No. 1876 = X 2078 = H I. 4 = 17 Draconis.
The duplicity of this pretty and easy object was discovered by H in 1780. All the
subsequent measures by various observers satisfactorily prove the fixity of the components.
/
1781-88 P = I 1éoo D = ".. H “With 278, 13 diameter of L.”
1802-83 1 17:68 tº e H
1823°33 II 5'43 4.512 H and S on 2 n. with 33-in. refr.
183 I-91 I 16:47 3’743 X on 7 n.
1832-87 I 157 3-8 SM
1848'50 II 5"o3 3-695 DA on I n. with 63-in. refr.
º
Micrometrical Measurements of Double Stars. 393
No. 1877 = X 2084 = H I. 36 = & Herculis.
One of the most beautiful and remarkable of the binary systems, detected by H. Its
period of revolution is probably the shortest yet known, scarcely exceeding 35 years, or
perhaps somewhat less. Notwithstanding the great difficulty of this object, it has been
well attended to by those observers who have possessed instruments of sufficient power, as
will appear from the following series.
1782°55 P = 65.30 D = 4. H
1826.63 23°40 o'91o 2 on 5 m.
1828 to 1831 Single tº e >
1832.75 22O'5o o'81 X on I n.
I 834°45 2O3’5o o'91 o X on 2 n.
1835'45 196'90 I ‘og4. 2 on 5 n.
1835.68 190°o o' 5 SM
1836-60 186°2O I'ogo 2 on 5 m.
1836-73 176.3 o:7 SM
1837-47 175'47 I’og7 X on 4 m.
1838-44 168-65 1'o6 o X and O 2 on 2 n.
1838.65 169'oo I " 2 SM
1839-67 16o'4o 1.165 X on 1 m. with 15-in. refr. at Pulkowa.
1839:76 16195 1.225 DA on 4 n. with Mr. Bishop's 7-in. refr.
1840.66 I 50-67 1.230 DA on 8 n. (D on 3) with Same.
184o'66 I 59'92 1.293 X and O > on 4 m. with 15-in. refr.
1841 '44 14928 I'1 19 M on 9 n. (D on 8).
1841-60 I49°oo I'253 O X on 3 m. -
1841.65 I42'97 1.239 DA on 4 n. (D on 3) with Mr. Bishop's 7-in, refr.
I 842°4′o I4 I'57 o'917 M on 3 n.
1842. 57 I 36-9 I “2 SM
1842° 58 I 38°47 1'o69 DA on 3 m. (D on I) with same telescope.
1842-64 I44'83 I'247 O 2 on 3 m.
1842.75 I4 I ‘4. I o'981 M on 4 n.
1843’58 I 3 o' 33 o'919 M
1843-64 129'89 1.298 DA on 3 m. (D on 2) with Mr. Bishop's 7-in. refr.
and Pr. Cr. M.
1845'27 I 19'o6 I'248 O > on 5 m.
1846-89 I 12:17 DA on 5 m. with 63-in. refr. by Merz.
1847: 18 I o8'40 I'41 o O > on 4 n.
A 847°47 I oA'67 I'3o4 M on 17 m. (D on 16).
I 847-53 I of 97 1-626 DA on 1 m. with 64-in. refr.
1848' 39 I o8' 5 I "O SM
ROYAL ASTRON. SOC. Wol. XXXV. 3 E
394. Rev. W. R. DAWEs, Catalogue of
1848:41 P = 93.78 D = "osz M on 3 m.
1848-61 Iozºo; 1.564. DA on 6 m. with 63.in. refr. and P. W. M.
1848:61 Ioz'37 1'509 DA on 3 n. with same telescope and Sph. Cr. M.
1849'48 99-23 1709 DA on 1 n. with same and P. W. M.
185o'54 9I '74. 14 est. F on 2 n. with 44-in, refr. by Cooke.
185o'55 9I ‘4 I 1.268 M on 3 n. (D on 1).
1851-23 84-82 1295 M on 3 m.
1851-51 89'32 1.3 est. F on 6 m. with 4+-in. refr.
1851.8o 86-90 1.593 DA on 3 n. (D on 2) with 63-in. refr.
1851.88 84.68 1.185 M on 8 n. (D on 7).
1852-53 83.8 I ‘3 SM
1852-64 83-97 1242 F on 5 n. (D on 2) with 44-in. refr.
1853' 15 81:16 1-585 J on 2 m. with 6'3-in, refr. by Lerebours.
I 85.3°39 77:28 1°230 M on 8 m.
1853'4o 8o'o6 1.664. DA on 7 n. with 63-in. refr.
1853'82 74’39 1.194 M on 3 n.
1854'o6 78°o; 1523 J on 3 n, with 6'3-in. refr.
1854-68 72°30 I’332 M on 5 n.
The very much smaller measures of distance by MADLER than by any other observer,
the difference amounting on some occasions to between o'4 and o”5, is worthy of notice,
and not easily accounted for. I, however, feel quite certain, that so bright and unequal a
star could not have been measured in distance with so much ease and certainty as I ex-
perienced with my refractor of 63-inches aperture in the observations of 1848, if its distance
had then been nearly so small: at which epoch a visitor to my observatory expressed great
surprise that such an object should be thought a very difficult one, My measured distance
was then I". 564; while MXDLER's was only 1"o82
No, 1931 = X 2107 = Herculis 167 (B).
A delicate double star detected by STRUvE, and which is proved by subsequent observa-
tions to be certainly binary. This was pretty well determined by STRUVE's measurements
compared together. The distance appears to have scarcely varied. We have the following
epochs for comparison.
- O // -
1829-91 P = 148-63 D = 1° 127 X on 3 m.
1836'54 156'43 I'257 2 on 3 n.
1837.74 I 59°23 I of 3 2 on 3 m.
I 84O'95 162'o6 1.268 DA on 4n. (Don 1) with Mr. Bishop's 7-in, refr.
1841'55 163°28 I'o est. M on 2 n. - \
I 842°40 162.76 I'o63 M on 3 n.
1846-41 166-93 o'884 M on 6 n.
Micrometrical Measurements of Double Stars.
395
1847'35
1848-43
1851-20
1851.77
1852.61
1853'48
I 854'4o
1854°52
1854.72
O
P = 16839
17oro8
174:72
176°og
176.67
180° 14
175’70
17872
178:22
D =
[o’934]
//
o'832
I 232
o:887
o:876
o'806
O'745
I 'I 29
o'861
M on 3 m, -
DA on 1 m. with 63-in. refr.
M on 3 m.
M on 6 n. (D on 4).
M on Io n. (D on 7).
M on 4 n. (D on 3). -
DA on 1 n. with 7}-in. refr. by A. Clark, and
Sph. Cr. M. Dist, rather uncertain.
DA on 1 m. with same tel. & P.W.M. “Obs, good.”
M on 3 n.
No. 1938 = X 2114 = P XVI. 270.
Though subsequent results have differed considerably from those of STRUVE, who dis-
covered the duplicity of this object; yet there is no sufficient ground for believing in any real
movement.
STRUVE's measures differ to an unusual degree among themselves,— the difference
among the means of 7 nights amounting to no less than 12°2.
1830'97
1832°41
1842:41
1847.63
1852'22
O
P = 135-67
I 37°o
I 43’5 I
I 43°38
142'82
D = #336 X on 7 n.
I 5 SM -
1.237 M on 4 m.
1.4-i- DA on 1 n. with 63-in. refr, and P. W. M. by
Merz. “Webs too thick.”
I'288 M on 2 n.
No. 1939 = .221 18 = H I. 19 = 20 Draconis.
A minute and very close double star, detected by H, and considered by him to be “the
most minute of all the double stars” he had found up to 1781, Sept. Io.
With 460 on his
7-foot Newtonian of 6-3 inches aperture, the stars were in loose contact, a dark division being
It is with reference to this difficult object that that eminent observer
makes the statement which has caused no small amusement, that “the observer as well as the
instrument must have been long enough out in the open air to acquire the same temperature.”
There seems to be no sufficient ground to suspect variation either in position or distance.
at times discernible.
1781-70
1830'32
1831' 37
1832°30
I832°41
- O
P = 242 5
242°58
246-1 I
246'44
245°o
D =
//
o:63o
o:700
o'848
o°8
H “With 460, in contact with an occasional
dark division.”
H on 1 n. (Z +180°) with 5-in. refr. by Tulley.
H on 2 n. (D on 1) with same (Z +180°).
2 on 5 n.
SM
396 Rev. W. R. DAWEs, Catalogue of
1836.75 P = 247°os D = &707 X on 3 m.
1839.72 243°7 o'7 SM
184o'77 242'93 ... DA on 1 m. with Mr. Bishop's 7-in. refr. by Dollond.
1854-81 24.1° 58 o:61 I DA on 3 n. with 7#-in. refr. by Al. Clark.
No. 1943 = X 2120 = Herculis 210 (B).
This object, discovered by STRUVE, is undoubtedly a binary system,-the position varying
in a retrograde sense, and the distance diminishing. The angle appears to have varied about
70° between STRUVE's first measures in 1829, and the close of 1854, or at the mean rate of
about — 2°.8 per annum.
1829-60 P = 1 *40 D = 3.835 2 on 2 n.
1833°28 3-64 3'47o X on 5 n.
1835°29 I '8 I 3-2 13 X on 7 n.
1836'55 o: 17 3: Ioo 2 on 4 n.
1837.74. 359'3O 2'997 X on 3 n.
1840°59 347°o I 2.982 DA on 3 m. (D on 2) with Mr. Bishop's 7-in. refr.
184I ‘45 347'o'7 2.8oo M on 3 m. (D on 1).
I 842°53 345'96 2.733 M on 5 n.
1842°53 342°37 2.748 DA on I n. with Mr. Bishop's 7-in. refr.
I 843’54 338°4 I 3°o est. DA on 3 m. with same.
1846'54 33 I I 3 2'443 M on I 3 m. (D on I2).
1847-50 327'37 2'487 M on 12 n.
1848-46 3.24°25 2'428 M on 2 n. (D on 3).
1848' 55 322'72 2-3 Io DA on 2 m. with 63-in. refr. by Merz.
1850.72 318: 1 I 2'430 M on 2 n. (D on 1).
1851-23 3 I 3 '50 23 18 M on 5 m.
185 I-74. 3 I 3°27 2:368 M on Ion.
1852.62 309'81 2:345 M on 15 n. (D on 14).
1853'.5o 306-82 2: 370 M on 7 n.
1854.71 3ol.' I I 2.324 M on 8 n. (D on 7).
No. 1952 = X 2130 = H II. 13 = (w Draconis.
Detected by H in 1779, and proved by subsequent observations to be a binary system.
It is a neat object, easily separated; but along with a retrograde movement in angle, the
distance has decidedly diminished. The components are so nearly equal that it is not easy to
determine to which quadrant the position ought to be assigned. In the following series it is
uniformly placed in the third; and where the observer, whose result is quoted, has set it down
in the first, the change is marked by the addition of (Z + 180°) in the remarks.
Micrometrical Measurements of Double Stars. - 397
1781-73 P = 23:37 D = 4,54 H “With 460, 2% diameters.”
18o3'45 22 o' I 4 tº o H
1821:38 208.35 3'907 H and S on I n. with 33-in. refr.
I 82 I'8o 2 Io'80 tº º X with the smaller instruments at Dorpat.
1825.25 zo8'97 4’330 S on 6 m. with 5-in, refr. by Tulley.
1828'52 208-07 3.337 X on 3 m. with 9-6-in. refr. by Fraunhofer.
1829-32 205'85 4:270 H on 8 m. (D on 6) with 5-in. refr. (Z +180°).
1830.79 .206.7 3-6 SM
I83 I'44 2O3 7 I 3.243 DA on 2 m. (Z + 180°).
1832.75 204 17 3-2 13 2 on 3 n.
1834-56 202'82 3.285 DA on 4 n. (D on 2) with 6'3-in. Herschel-New-
tonian on 3 n.
1835-39 2O3'o'7 3’ I 53 2 on 3 n.
1836.79 zoz'85 3.267 X on 4 m.
I 839°53 2Oo'3 3°3 SM
1840.62 1987.2 3’og I DA on 2 n. (D on 1) with Mr. Bishop's 7-in. refr.
1848-52 I93°o2 3'o88 DA on 1 n. with 63-in. refr. by Merz.
1851.75 190. Io 3’og 1 F on 4 m. with 44-in. refr. by Cooke.
1851.89 I9 I-84 3.07.0 M on 3 m. (D with 2).
1852-25 18797 2.973 M1, P by 48 obs., D by 9o, with 44-in. refr. by
- Cooke.
1852-63 I 9o'57 3'o24 M on 7 n.
1853'57 190-69 2.984 M on 2 n.
1854-26 I 88°26 3.042 DE on I I n. with 53-in. dialytic refr. by Plössl.
1854.68 188:37 2.926 Mo on 3 m. with Lord Wrottesley's 73-in. refr.
1854.70, 188:07 2.879 DA on I n, with 7%-in, refr, by Al. Clark.
1854-78 I 88°28 2.787 M on I n.
No. 1956 = 36 Ophiuchi.
A neat double star to which some special interest is attached from the components appear-
ing to have some orbital motion, and also from its having a common proper motion with 3o
Scorpii, though at a distance from it of above 12'. Its great south declination renders the
measurements very difficult in these latitudes; and it is too far south of the equator to be
included in STRUVE's Catalogue.
1822:52 P = 22#3; D = #546 H and S on 3 m. (D on 2).
1824.86 228’47 & tº S on 3 n.
1825, 17 tº gº 5' 200 S on 3 n.
1831: 57 226. I 5'2 SM
1835-19 223°49 4'875 H on 5 m. (D on 4), with 5-in. refr. at the Cape.
398 Rev. W. R. DAWEs, Catalogue of
1835'33 P=22#4 D=#o SM
1839.28 2 I 9°5 5°3 SM
1841-59 2 19:26 4:784. DA on 3 n, with Mr. Bishop's 7-in. refr.
1842-46 216.6 4'9 SM
1846’21 2 16:12 4'738 J on 3 m. with 33-in. refr. at Poona.
1850-62 214.93. 4'486 J on 2 m. with 6'3-in. refr. by Lerebours, reduced to 4-in.
1854'o'7 2I4’37 4, 127 J on 2 m. with 6'3-in. refr. by Lerebours. (The 2nd O.G.)
No. I959 = 2, 2 140 = H II. 2 = 0. Herculis.
One of the most beautiful of the double stars discovered by H. It exhibits a fine but not
unusual contrast of colours;–A, being a fine reddish yellow, or orange; and B, a deep green,
or bluish green. Considering the easy character of the star for micrometrical measurement,
the discordances are remarkably great. The brightness of A has been observed to be slightly
variable as seen by the naked eye; and STRUVE has noted that the magnitude of B cer-
tainly varied from the 5th to the 7th, and doubts whether the naked-eye variation may not
arise from this. In his observations he has uniformly noted A as of the 3rd magnitude. As
in several other similar cases, the striking colour of the smaller star is proved not to arise from
contrast with that of the larger, by the colour remaining the same when the large star is
hidden. Notwithstanding the great difference in the angles measured by HERSCHEL in 1782
and 1803, the relative fixity of the components seems to be established by the more recent
measures. Captain JACOB has from his own observations suspected this star of having a small
annual parallax = o'o6.
1782.69 P = 117:17 D = 4;67 H. “Mean of 4 measures in 1781 to 1783.”
I 8o3'4o I 2 I-95 ... H. “By 8 measures in 1802 to 1804.”
1821-74 I Ig'55 5'286 H and S on 3 n. with 33-in, refr.
1829:63 I 18.48 4'648 X on 12 n.
1831.25 1 1968 4'896 DA on 4 n. with 3.8-in. refr.
1832°23 I 1918 4790 H on 3 n, with 5-in. refr.
1832°5 I II 9°4. 4-6 SM
1841 “4 I I 1891 4'24 I M on 3 m.
I 845'3 I I 1997 4.522 HI on 1 n, with Mr. Bishop's 7-in. refr. and Pr. Cr. M.
1846'46 I 19°5 I 4'867 HI on 2 n. (D on 1) with same.
1848-52 I I 8:45 4:647 DA on 3 n. with 63-in. refr.
1850'66 I 18°o8 4'694 F on 3 m. with 44-in. refr.
I 853' 30 117.86 4' 5 14 J on 36 m. with 6'3-in. refr. in 1852–4.
1853-63 II 8'2 I 4,618 DE on 6 m. with 53-in. dialytic refr. by Plössl.
Micrometrical Measurements of Double Stars. 399
No. 1962 = X 2161 = H II. 3 = g Herculis.
A fine and elegant object. Its duplicity was discovered in 1779 by H, whose measures
compared with those of more recent date seem to indicate a slow direct motion in position.
But the close agreement of modern observations renders this doubtful. The central distance
obtained by H with a new micrometer in 1781 is probably much too small, and that by H and
S in 1821 seems to be considerably too large, as is frequently the case.
1781-79 P = 3e335 D = #969 H. “With 460, 2 diameters of S.”
18oz. 17 3o I'2O ... H - - -
1821:38 307-88 4:463 H and S on I n, with 33-in. refr. by Dollond.
1830'35 307'22 3:600 2 on 4 n.
1830-63 3O8-49 3-86 I DA on 2 n. with 3.8-in. refr.
1831-60 308'5 3-6 SM
1839'74 308-9 37 SM
1840-83 308-95 3-773 DA on 1 m. with Mr. Bishop's 7-in. refr. by Dollond.
1841'46 31 o'60 3-696 M on 3 n.
1846'51 3 Io'23 4'oso J on n. P by 2 I obs, ; D by 12.
1847.67 3 I O'44. 3-74.1 M on 3 m. -
I 847-95 309'oz 3.781 DA on 2 m. with 63-in. refr. by Merz.
1852'I 3 3 II I 5 3°62o M on 3 m. in 1851–2.
1853'77 308-92 3784. DA on 1 m. with 63-in. refr.
1853-91 309.72 3-5 10 DE on 6 m. with 53-in. dialytic refr. by Plössl.
No. 1966 = X 2.173 = Ophiuchi 221 (B).
One of the most interesting of the double stars discovered by STRUVE. Its binary character
is indubitable. After measures by its discoverer in 1829 and three following years, it became
single in 1836, and continued so in 1837. In 1840 I could just discern a slight elongation of
the disk with Mr. BISEIOP's 7-in. refractor; and from that time the distance has gradually
increased ; so that in 1843 the stars were separable with the same telescope, and the distance
was estimated at o"'9. Both the components are of a deep yellow, or golden hue. The star is
found in few catalogues; but ARGELANDER has inserted it in his Uranometria Nova under
the constellation Ophiuchus, where it is noted as of the 6th magnitude, and a reference is
given to No. 22 I of BODE's Catalogue, from whence it is also transferred into the British
Association Catalogue as No. 591 o.
P = 32380 D = o(622 2 on 5 n.
Single >
167'o'8 o 5 est. DA on 1 m. with Mr. Bishop's 7-in. refr.
1830.84
1836 and 1837,
1840'47
4OO Rev. W. R. DAWEs, Catalogue of
1841-36 P = 17:30 D = &676 M on 6 n. (D on 5).
1841-64 167.43 O'714. DA on 2 n. (D on I) with same telescope.
1842°51 169-88 o'753 M on 3 n.
1842-67 163-32 o:75 est. DA on 3 m. with same.
I 843’54 161' 23 o’9 est. DA on 6 m. with same.
1845'55 162:45 o’974 M on I n.
1846'46 I 59' 39 I 'O?4. M on 6 n. (D on 5).
1847°47 I 59' 16 I' I 59 M on 2 n.
1848°45 I 59°45 1 Ioé DA on 1 m. with 63-in. refr. and Sph. Cr. M.
1851'32 I 54' I 2 I 266 M on 4 n.
1852'24 154'82 1' 209 M on 4 n.
1854.66 I 5o 53 I '374. M on 3 n.
No. 1979 = X 34 Appendia. I. = H v. 30 = 53 Ophiuchi.
One of the stars proposed by Mr. OTTO STRUVE for comparison of measures. No relative
motion seems to have occurred since HI’s measures in 1782.
1782.38 P = 1938o D = 34.35 H. “Dist, a narrow measure.”
1821'47 I9 I'32 41-662 H and S on 1 n. - .
1835-56 I9 I'44. 41'o62 X on 5 m. Mens. Microm. Appendix I. No. 34.
1836:51 I 92°5 4. I*3 SM -
1841'o6 I9o'55 41-485 O > on 3 n. (D on 2). Communicated by letter.
1848'53 19 I'47 41'518 DA on 3 m. with 63-in. refr.
No. 1982 = X 2.254.
Detected by STRUVE, since whose measures no change has occurred. It does not appear
to have been much attended to.
// -
D = 3-223 X on 3 n.
3'o est. DA on 2 m. with Mr. Bishop's 7-in. refr.
1831-oo P = 26;97
I 843'49 265'30
No. 1984 = X 2262 = H I. 88 = t Ophiuchi.
A most interesting binary system, detected by H, and affording a surprising proof of
the excellence of his instruments, and the keenness of his discernment. When first dis-
covered he considered it the closest of all his double stars. With his 6'3-in. Newtonian
and power 460 it was wedge-formed; with 932, one half, if not three quarters, seemed to be
Micrometrical Measurements of Double Stars. 4.OI
behind the large star. On examining v Ophiuchi, which is about 13° from r, he found it
perfectly free from this wedge-formed appearance. Of late years it has opened out con-
siderably, and become comparatively easy of measurement; but its very moderate meridian
altitude in these latitudes has required the selection of the best circumstances to do justice ,
to the object and the instrument. The position, too, having become very oblique, has
demanded special care to avoid personal errors.
J/
1783-27 P = 331;60 D = . . H “A wedge.”
1825-67 Single • . X on 3 m. with 9.6-in. refr. by Fraunhofer.
1827-28 146'o Oblong X on 1 m.
1835.68 1929 O'35 X on 6 n.
1837-70 2Oo’8 o°35 X on I n. “sometimes separated with power 848’’
(called I ooo).
1838.58 2 I 4°o o'5 SM
1840.68 22 I'54 o'88o DA on 4 n. (D on 1) with Mr. Bishop's 7-in, refr.
I 84 I 53 2 I 7'35 o:752 M on 8 m.
1841-66 225'70 o'790 DA on 5 m. (D on 1) with same telescope.
I 842. 52 227°o o'9 SM
1842 '57 225'6o o'772 M on 5 n.
1842-64 226'90 • • DA on I n. with same telescope.
1843-61 228.96 o’95 est. DA on 2 n. with same.
1848.66 232°75 I'oi I DA on 1 m. with 63-in. refr. by Merz.
1852-65 239° 5 I I I o4 J on 2 m. with 6'3-in. refr. by Lerebours.
1852.66 238: 57 1.267 M on 4 n. (D on 3).
1853.79 238'29 1' 167 M on 4 n.
1854.67 238°o 5 1.223 DA on 1 m. with 7%-in. refr. by Al. Clark.
1854'71 238 19 I'ogo M on 3 m. -
No. 1998 = X 2264 = H III. 26 = 95 Herculis.
A very beautiful double star, detected by H in 1780. It is remarkable for the peculiar
colours of both stars; and it is a singular fact, that the components of a double star, which are
nearly of equal magnitude, scarcely ever present so striking a difference of colour. On the
- whole, there is a fair agreement among different observers in their judgment of the colours ;
which is the more remarkable as they are peculiarly delicate. There is no evidence of
relative motion, either in position or distance.
1781-81 P = 26 5% 5 D = 6'roo H “Prec. white ; foll, bluish white.”
1821.97 261.87 6-623 H and S on 2 n. “Pr. reddish ; foll, bluish white.”
1829-90 261.75 6'o62 > on 4 n. “Major (seq.) flava-subviridis ; minor,
flava-subrubra.”
ROYAL ASTRON, SOC, VoI. XXXV. 3 F
4O2 - Rev. W. R. DAWEs, Catalogue of
1833.78 . P = 261% D = 6% SM “A, 5}, light apple-green ; B, 6, cherry-red.”
1848:45 261'20 6.294 DA with 63-in. refr. and Sph. Cr. M. “A, 5,
greenish-white ; B, 5-H, pinkish-yellow.”
1848-51 26o’95 6:176 DA with same telescope and P.W.M. “A, light
- green ; B, pale red.”
1853-77 26ozo 6'1 17 DA with same. “A, greenish-white ; B, pale
orange.”
1854.87 259'98 6.1 5 I DE “A, 5-3, blanc-vert; B, 5'5, rose-pále.”
The Baron DEMBowsRI adds to these observations the following remark: “In the Small
number of observations which I have made, I cannot say that I have remarked any decided
variability in the colours of these stars.”
No. 2001 = X 2272 = H II. 4 = 70 Ophiuchi.
One of the most interesting and beautiful of the binary systems. It was discovered by
H in 1779. Being easy of measurement it has attracted the attention of all astrometers,
and the number of observations is consequently very great. The following liberal selection
will suffice to show the character and quantity of its orbital movements.
M/
177977 P = 90°oo D = . . H “L. white ; S. inclined to red.”
1781-74 8o'77 © e H (quadrant conjecturally altered from s.f. to n.f).
1802°34 336-13 • tº H
1804'4. I - 3 18:8o • • H
1819:64 168°48 tº º 2 with the smaller instruments at Dorpat.
1820.77 16o:25 º º 2 with the same. •
182 1 '74 157.65 379 X with the same.
1822'42 I 54'8o 4.266 H and S on 5 n.
1822-64. 153-87 3-76 X with the smaller instruments.
1825' 57 148:22 3'984 X on 14 n, with 9:6-in. refr. by Fraunhofer.
1827'oz 145.15 4’375 X on 2 n.
1828-71 I4o'22 4:782 2 on 4 n. .
1829'59 13808 5'o87 X on 6 n.
1830: 36 138: 15 5'95 H on 9 m. with 5-in. refr. by Tulley.
1830-50 I 35'82 5'474 B with the Königsberg heliometer.
1830-57 I 37'33 5'530 DA on 6 m. with 3.8-in, refr, by Dollond.
1830.76 I 36-4 5:43 SM
183 o'84. I 35°75 5'3 Io X on 2 m.
1831 52 I 36-13 5'966 H on 8 m. (D on 6),
1831°53 I 33'95 5'679 B with the heliometer.
1831.68 I 34.70 5:41 o X on 5 n.
1832° 55 I 32-77 5’714 DA on 5 m. (D on 3).
1832°57 I 35°52 5'494 H on 4 m. (D on 3).
Micrometrical Measurements of Double Stars. 403
1832’69
1832.75
I 833°42
1833'59
I 834'47
1834-57
1835'56
1835-60
1836.66
1836-81
1837. 13
1837-64
1837.72
1838'51
1839-65
184o'59
1841°30
1841.68
1842-53
1842-55
1842-67
1845°43
1846-46
1847-48
1848: 12
185 I-74
1852'44
1852.73
1852.75
1853:60
1853.76
1854'o8
1854°27
1854.68
1854'73
O
P = I 32.98
I 33-97
132'82
I 32° 5
I 3 I’ I 5
I 3 o'65
130°6
13o'76
I 29° 53
I 28-6
127.68
127' 5
128°o;
126'5
125-88
124'88
I 25*44
I 23°42
123'36
I 22°4.
I 2470
12 o'83
Izo’ I 5
I 1977
1 18-83
II 5" 53
II 4'9
I 1470
I I4°o S
I 14.66
I 13° 27
II 3-65
I 14:63
II 3'23
I 1371
D = 5’794
5' 553
6'142
5'98
5'852
6- 128
5°97
6. Io9
6. 137
6' 19
6'474
6:26
6-152
6.25
6' 552
6.628
6:400
6.63.5
6'724
6-64
6.251
6-773
6. 138
6'8o
6'804
6-673
6'50
6'558
6'729
6'489
6'563
6:365
6:327
6:308
6'339
B with the heliometer.
2 on 3 n.
DA on 3 m. (D on I).
SM
2 on 4 n.
DA on 7 n. (D on 5). On 5 n. with 6'3-in. Her-
schel-Newtonian.
SM
2 on 5 m.
X on 8 m.
SM -
DA on 3 n.
SM
2 on 4 n.
SM
DA on 2 n. with Mr. Bishop's 7-in. refr.
DA on 4 m. with same. -
M on 8 n. (D on 7).
DA on 4 m. (D on 3) with 7-in. refr.
DA on 2 n. -
SM
M on 4 n.
HI on 8 n. (D on 3) with Mr. Bishop's 7-in, refr.
HI on 6 n. (D on 1) with the same.
SM, -
DA on 3 m. with 63-in. refr.
M on 7 n. (D on 6).
SM.
M on I I n.
J on 3 m. with 6'3-in. refr. by Lerebours, at Madras.
DA on 7 n. (D on 5) with 63-in. refr.
M on 5 m.
J on 4 n.
DE on 18 n. (D on 17) with 54-in. dialytic refr.
M on I on.
DA on 4 m. (D on 3) with 7%-in, refr. by Al. Clark.
No. 2028 = O > 342 = 72 Ophiuchi.
This object stands as a very close double star in the Pulkowa Catalogue, a small com-
panion of about the eighth magnitude having been detected with the 15-in, refractor in 1842,
at an angle = 160°-E, and distance 1"3o. It was not seen subsequently till 1847, when
4O4. Rev. W. R. DAWEs, Catalogue of
the angle was measured = 166°3, and distance 1".59 ; and again in the same year,
P = 170°7, D = 1"-2 est. In 1848 and 1850 it was noted as single. I have examined
it with several different telescopes, and among them with Mr. LASSELL’s 20-foot reflector
of 24 inches aperture, but could never obtain a glimpse of any close companion.
No. 2029 = X 2281 = H I. 87 = 73 Ophiuchi.
The duplicity of this close object was detected by H in 1783. There seems some ground
for suspecting a slight decrease in the angle; but the star is not an easy one to measure
well, as is shown by a difference of 5° in the results of STRUVE's three nights’ observations.
Yet, as there is a difference of 7° between HI’s measure and the mean of STRUVE's, and
also about 5° between that mean and more recent results, we seem to be justified in
considering this object as most probably a binary system.
1783:32 P = 267.20 D = % H “With 460, about 4 or 3 diameter of S.”
1822:46 257-62 1989 H and S on 2 n. (D on 4) with 33-in. refr.
1831°o; 259'73 I'543 2 on 3 n.
1834-60 26o 5 1.7 SM
1837.72 259'82 I'447 2 on 4 m.
1838:74 259'9 I 5 SM
I 84I 54 254.86 I'303 M on 5 n.
1841'58 25 5'5.5 1408 DA on 1 n. with Mr. Bishop's 7-in. refr.
I 842-39 255°o I ‘4. SM
1842:70 256'o8 I'429 M on 3 m.
1843-62 257'24. I'55o DA on 2 n. with Mr. Bishop's 7-in. refr. and
Pr. Cr. M.
1849'48 254°97 I'38o DA on I n. with 63-in. refr.
1851-37 256' 17 I'5 est. F on 3 m. with 44-in, refr.
1851-71 25461 I 276 M on 4 m. (D on 2).
1854.68 252'O2 1°321 M on 5 n. (D on 4).
No. 2033 = O > 346.
One of the double stars discovered by Mr. OTTO STRUVE with the 15-in. Pulkowa
refractor, and contained in the list he sent me for comparison of our results. Except one
night's measures by Prof. MADLER, I am unacquainted with any other observations of it.
1845°o I P = 3.29% D = #427 O X on 3 n.
1847.75 327°4o 5'464 M on 1 m.
1851.76 327'27 5'723 DA on 2 m. with 63-in. refr.
Micrometrical Measurements of Double Stars. 4O5
No. 2035 = 2, 2309 = H I. 86.
A small double star found by H. The measures show no evidence of movement, either
in position or distance.
1783-32 P = 349% D = ". H “With 460, a little more than 1 diam. of S.”
1823'42 352.8o 4-587 H and S on I n. -
1830°75 354*7O 3’523 2 on 3 m.
1842'5o 351.86 4:373 M on 3 m. (D on I).
1843°o8 35 o'32 37.36 DA on 4 n. (D on 1) with Mr. Bishop's 7-in, refr.
No. 2039 = A. C. Io = 21 Sagittarii.
Discovered to be double by Mr. ALVAN CLARK, but I am not acquainted with any other
measures of it than my own. The larger star I have noted as being of a light yellow, and
the smaller blue. -
No. 2041 = A. C. 11.
The duplicity of this object also was discovered by Mr. ALVAN CLARK ; and it does credit
both to his telescope (of his own manufacture), and to the quickness of his discernment. The
only measures of it which I am aware of besides my own are by Professor SECCH1, at a later
date than is included in this Catalogue, yet they may be adduced for comparison with mine.
The Professor quotes them from LOOMIS's Recent Progress of Astronomy; and speaks of the
star as discovered at Amherst in America. Whether it is so stated in LOOMIS’s work I cannot
say, as I do not possess the book ; but it is evidently a mistake. On referring to a letter of
Mr. ALVAN CLARK's, dated 31 July and 1 August, 1854, I find this object mentioned as
discovered by him “the evening before,” with a glass he had just finished for Amherst
Observatory ; and the correct date of the discovery was July 31st, not the 3oth as stated in
the list of new double stars discovered by him, which was presented to the Society in 1857,
and printed in the M. N. for June in that year.
1854.70 P = 17&io D = &425 est. DA on 2 n. with 73-in. refr. by A. Clark.
1859-60 175°oo O'3 SE on 1 m. with 9-6-in. refr. “Elongated,
but not separated.”
No. 2043 = X 2316 = H I. I2 = 59 Serpentis.
Notwithstanding some discrepancies, which must be accounted large in so easy an object,
there seems no reason to suppose any alteration either in position or distance. It should be
noticed that the position of the stars is very oblique. The colour of B is a fine deep blue.
406 Rev. W. R. DAWEs, Catalogue of
1781-79 P=315; D = "... H “with 278, 13 diameter of L.”
1822'95 318:08 4: 151 H and S on 3 m. with 3}-in. refr.
1825'47 3 I 4’33 3'957 2 on 3 m.
1825'54 318: 57 4:46.5 S on 5 m. with 5-in. refr.
1829:23 32O'57 5' I o H on 2 n. with the same 5-in. refr.
1830-61 3I4' I 5 4’337 DA on 3 n, with 3.8-in. refr.
1831.58 3I 3'9 4°2 SM
1831.76 31390 3'937 2 on 3 n.
I 835°49 3I4*7 4'4 SM
1840.69 313.8o 3'941 DA on I n. with Mr. Bishop's 7-in. refr.
I 842°53 3I4'2' 3:9 SM
1852.76 3I4°35 3.657 J on 5 m. with 6.3-in. refr.
No. 2044 = 2, 2319.
The comparison of my results with those of STRUVE shows that no change has occurred
since he discovered the duplicity of this object. There is also a small distant star, at a small
angle n. p. which I did not measure. -
D = 5%i; 2 on 4 n.
5'684. DA on I n.
O
P = 191'o;
191° 13
1830-40
I 849:47
No. 2045 = O > 353 = p Draconis.
Discovered by Mr. OTTO STRUVE with the Pulkowa refractor. Having been accidentally
omitted from a list of his stars which I had measured, but had no observations of his where-
with to compare mine, I have not yet received his measures, and the following are all I am
acquainted with.
1847-35 P = 6334 D = 6.45 est. M on I n.
1853-89 67-72 o:6 est. DA on I n, with 63-in. repr.
1859-60 27o SE on 1 n. “Very uncertain.”
It would seem as if the stars must have greatly approximated between 1853 and 1859, as
I have not noted any remarkable difficulty in the observation with my much smaller telescope.
No. 2046 = X 2329.
Of this object, I know of no other measures than those of the discoverer and my own,
which afford no ground to suspect any change. The very oblique position of the components
should be noticed by astrometers.
D = 477 X on 3 m.
4’ I 55 D on I n.
O
P = 43' 30
45' 35
1830'57
I 849:48
Micrometrical Measurements of Double Stars. 4O7
No. 2047 = O > 358.
Mr. OTTO STRUVE, the discoverer of this close double star, has favoured me with his own
observations of it for comparison with mine. It is singular that we place the smaller star in
opposite quadrants, as we both recognise a decided difference in the magnitude of the com-
ponents: the direction being precisely the same.
1845.40 P = 33.63 D = #130 O 2 on 3 n. A, 6.8; B, 7.3.
1848: 56 2 18-62 1’ 185 DA on 1 n. A, 7 ; B, 7}.
No. 2048 = O > 359 = Pxviii. 132.
Mr. OTTO STRUVE, the discoverer of this very close double star, has sent me some measures
of it, which are the only ones beside my own which I know of. It appears that we have
placed the smaller star in opposite quadrants, the components being of nearly equal magnitude,
and apparently slightly variable in their relative brightness; on some occasions the difference
being scarcely perceptible, while on others as much as half a magnitude was noted.
1846.25 P = 35; 88 D = &597 O X on 4 m. with 15-in. refr. by Merz.
1848: 56 176-92 o'729 DA on 2 n. with 64-in. refr. by Merz.
1854; 16 178° 55 o'604 DA on 2 m. with the same, and 73-in. refr. by A.C.
The increase of the angle is too slight in so difficult a star to allow of any conclusion
respecting relative motion being grounded upon it. On one night out of the four, I have
judged the star in the n. p. quadrant to be the smaller.
No. 2052 = X 2360.
The differences in the measurements of position of this double star discovered by STRUVE,
are greater than might probably arise merely from the difficulty of the object, which is very
moderate ; and it is therefore not unlikely that they indicate some relative motion.
O //
1831'oZ P = 5·73 D = 2 5 27 X on 3 n.
1852.62 I 51 2.836 M on 2 n.
1853.75 359'92 2-634. DA on I n.
1856.66 o' 19 2'419 SE on 2 n. (Difference of angles in the two
nights = 5°26.)
408 Rev. W. R. DAWEs, Catalogue of
No. 2053 = x 2375 = Tauri Poniat. 75 (B).
One of STRUVE's discoveries; a neat double star of which the components differ by about
half a magnitude. I have noted both as very white. The supposed rapid rotation of this
elegant pair is not supported by subsequent results, and evidently arose from error of
observation. - .
1828.65 P = iojo, D = 1%8 H on 1 m. with 5-in. refr. by Tulley.
1829. Io Io9' I 2 2°236 X on 5 n. -
1829.8o Io9'42 2:48 H on 1 m. with the same telescope,”
1831.60 108-83 2: 144 H on 3 m. with the same.
1832.56 Io9'77 2.270 DA on 3 n. (D on 1) with 3.8-in. refr. by Dollond.
1834°50 Io9'5o 2.269 DA on 1 m. with 6'3-in. Herschel-Newtonian.
1841-62 1 1 I'37 zºo.48 M on 3 n. (D on 2).
I 842'54 I I I'63 2.269 M on 2 n. (D on 1).
1848: 56 I I I 48 2-o/2 DA on 1 m. with 63-in. refr. by Merz.
1850-86 I 1290 2.373 M on I n.
1852°o I I I I 53 2:237 M on 3 n.
I 854'59 I IO" i I 2.286 DE on 5 m. with 53-in. dialytic refr. by Plössl.
No. 2054 = 2 2384.
Notwithstanding the strong doubts expressed by Mr. HIND in his note on this star at the
end of the measures of double stars at the South Villa Observatory, I cannot but regard this
star as constituting a highly interesting binary system ; though its orbital movement is far less
rapid than was indicated by the comparison of STRUVE's measures in 1832 and 1836. While
with Mr. BISHOP's 7-inch refractor and power 3 zo, the two stars were in best moments just
divided in 1840, it was not till after long and careful examination with my 74-inch telescope
and power 500, in 1854, that I could feel satisfied the star was not absolutely single and round.
The three measures however, taken on that single night of observation, differed so little among
themselves as to render it evident that there must have been some elongation of the disk in the
direction measured.
1832°34 P = 30%iz D = 6'823 2 on 3 m.
1836-87 3 18:34 o:65o X on 5 m.
1841 oz 31 2-82 o:7 DA on 3 m. with Mr. Bishop's 7-in. refr.
1852.62 330-85 o'4 est. M on 2 n. -
1854-83 332-88 o:35 est. DA on 1 n. with 74-in, refr. by Al. Clark.
Micrometrical Measurements of Double Stars. 4O9
No. 2058 = 2 2382 = H II. 5 = a, (4) Lyrae.
This is the preceding pair of the celebrated “double-double” star discovered by H in
1779. Though this pair is often termed “s Lyrae,” and the following pair “5 Lyrae,” yet the
Greek letter includes both pairs; which appear as one star of a rather small 4th magnitude
to the naked eye. H therefore correctly referred to his “double-double” as “s Lyrae, Fl.
4 and 5.” And ARGELANDER, with his usual attention to minute accuracy, links together
Fl. 4 and 5 as forming & Lyrae, and assigns the 4th magnitude to the whole as to a single star.
It is a singular fact, that both pairs constitute binary systems, in which the orbital revolution
is performed in the same direction,-retrograde. Hitherto, the movement has been slow in
both systems, and the distances have varied but little. Some suspicion has been expressed
that the two systems may be physically connected, and may revolve round a common centre
of gravity. These objects presenting only a moderate degree of difficulty, have been
abundantly observed and measured; and a selected series will suffice to show the direction
and amount of the change in each.
1779-83 P = 3392 D = #437 H. “With 460, near 1% diameter of L.” “L, w;
* S, inclining to r.”
18o3.83 3o'77
... H by 3 measures.
1821-86 27' 5 3’95 X with the smaller Dorpat instruments.
1822 I 2 25.88 4'o Io H and S on 4 n.
1829'8o 24'40 4. 3: 56 H on 1 m.
183 o' 53 23.72 3'57 I DA on 2 n. with 3-8-in. refr.
183 o'73 25'3 3' 5 SM “A, 5, yellow ; B, 63, ruddy.”
I 83 I ‘44 26'o6 3°o 34 2 on 7 n., “Major = 4-6, albasubviridis ; minor
= 6' 3, albasubcaeruled.”
1832°57 25' 25 ... DA on 1 m. with 3-8-in. refr.
1834°52 24'37 3'326 DA on 2 n. with 6'3-in. Herschel-Newtonian.
1836:45 23'9 3°2 SM -
1839.78 2 I '9 3'3 SM
1841:38 2 I '95 3:255 DA on 5 m. with Mr. Bishop's 7-in. refr.
I 84 I ‘49 22°9 I 2.887 M on 4 II. (D on 2).
1842-47 22° 14 3' 193 M on 4 n. (D on 1).
I 842'59 2O'6 3'2 SM
1846'95 2 I '72 3’ 168 DA on 1 m. with 63-in. refr. by Merz.
1847' 53 2 I '66 3' 198 M on 7 n.
I 848° 59 2 I ‘40 3' 149 DA on 3 m. with same telescope.
I 85 o' 54 2 I-97 3:226 M on 5 n. (D on 1).
1851-65 1967 3' 148 F on 6 m. with 44-in. refr. “A, white; B, reddish.”
1851-82 2 I 42 3, 182 MI P by 36 obs., D by 32, with 44-in, refr.
“A, yellow ; B, reddish.”
ROYAL ASTRON. SOC. WOL, XXXV. 3 G
4 IO Rev. W. R. DAWEs, Catalogue of
1851'84 P = 2:34 D = 3.264 M on 6 n.
1852'58 2 I 3 I 3' I o4 M on 4 m.
1853-71 1917 3°o SM
1853-71 20-48 3.205 DA on 2 n. with 63-in. refr.
1853°75 20.65 3' 196 M on 2 n.
I 854°22 e - 3.352 DE on 1 on, with 54-in, dialytic refr. by Plössl.
1854'70 zo'89 3°o23 M on 4 n. (D on 3).
I 854'71 1960 3'I 25 DA on 4 m. with 74-in. refr. by Al. Clark, and
- P.W. M.
1854.81 2O'52 ... DE on 5 n. with 53-in. dialytic refr.
I854-84. I9'58 3'o31 DA on 2 n. with 74-in. refr. and Sph. Cr. M.
No. 2075 = 2 2383 = H II. 5 = e, (5) Lyrae.
Both stars of this pair are white; and by a general agreement of observers, the southern is
rather the smaller. The orbital movement of this pair seems to be about twice as rapid as of
the other pair. Between these two sets there are two delicate stars of about magnitude I ok.
Having previously understood that they required a far greater illuminating power, I was
astonished at the steadiness with which I perceived them the first time I turned upon this
object my five-foot refractor of 3.8-inches aperture by Dollond. Several much fainter stars
immediately precede them. {
1779-83 P = 173°47 D = ". H. “With 460, full 1; diameter.”
1804'o8 167'o'; ... H
I 82 I '86 I 59' 4o 3' 17 X with the smaller Dorpat instruments.
1822°42 I 59'93 3'8o I H and S on 1 m. with 33-in. refr.
I 825" 53 I 59' 18 3'34o S on 4 m. with 5-in, refr. by Tulley.
1829-70 158-27 3'48o H on 2 m. with same.
183 o' 57 I 57'33 2.927 DA on 5 m. with 3.8-in. refr. by Dollond.
183 o'73 I 57. I 2.8 SM
I83 I'44 I 55' 17 2-573 X on 7 m. with 9-6-in. refr.
1832°57 156'98 3-26 H on I n, with 5-in. refr.
1832°57 I 56.25 2’627 DA on 1 m. with 3.8-in. refr.
1834°52 I 54°27 2.865 DA on 2 m. with 6'3-in. Herschel-Newtonian.
1836:45 I 54-6 2°5 SM
1839.78 152.8 2'5 SM
1840.72 1 52'83 2.578 DA on 2 n. with Mr. Bishop's 7-in. refr.
I 84 I ‘49 I 53-64 2-503 M on 4 n. (D on 2).
1841-66 1 5 I '85 2’659 DA on 2 m. with same.
I 842°47 I 53'25 2.846 M on 4 n. (D on I).
1842. 59 I 5 o'9 2.6 SM
Micrometrical Measurements of Double Stars. 4 II
1846'95 P = 14398 D = 244. DA on I n. with 64-in, refr. by Merz.
1847' 53 I 5 o' 23 2:739 M on 7 n.
1848'54 I 48-93 2'592 DA on 2 m. with same telescope.
185 o' 54. 149' 56 2.829 M on 5 n. (D on 1). -
1851-57 I 47°o 5 * 2:42.2 F on 6 m. with 44-in. refr. by Cooke.
18; 1.82 146'73 2489 M1, P by 24 obs., D by 32.
1851.84 148'54 2.806 M on 6 m.
1852'58 I 49' 18 2'482 M on 4 n.
1853-71 147:46 2'456 DA on 2 m. with 63-in, refr.
1853.75 I 47° 37 2.918 M on 2 n.
1854. Io 146'96 2’642 DE on 9 m. with 53-in. dialytic refr.
1854.70 146'79 2'662 M on 4 m.
1854.72 146-22 2'427 DA on 4 n. with 74-in. refr. by Al. Clark, and
- F.W. M. -
1854-84 I 45'93 2'477 DA on 2 n. with same telescope and Sph. Cr. M.
No. 2091 => 38 Mens. Microm. Appendia. I = H v. 2 = . Lyrae.
This was included in a list of double stars proposed by Mr. OTTO STRUvE for comparison
of measures. The components differ decidedly in colour, the larger being pale yellow, and
the smaller pale purple, according to my estimate ; though STRUVE calls them both “albae
subvirides.” No evidence of change appears in the measures at different epochs since the
duplicity of the object was discovered by H in 1779.
1782'3 I P = 15:30 D = 499 H. “L, white; S, white inclining to pale rose-
colour.” *
I 823:42 149'85 44'240 H and S on I n. “L, white ; S, blue.”
1830'50 I 50'40 - 44'O3 H on 1 n. - -
1834.78 149-6 43-8 SM “A, 5, topaz; B, 5}, greenish.”
1835:23 149-67 43'706 X on 5 n.
184o'71 I 5 o'oo 43'907 O 2 on 3 n.
I49'48 43'92 o DA on 3 m. “A, yellow, or pale yellow ; B,
1848-56
purple, or pale purple.”
No. 2094 = X 2403 = Draconis 203 (B), • *-
One of STRUVE's discoveries, and a rather difficult double star to measure well ; as is
proved by an extreme difference of above 8° in STRUVE's results on four mights. It seems to
have been but little attended to ; and there is not sufficient evidence of a binary character.
412 Rev. W. R. DAWEs, Catalogue of
1832'21 P = 25870 D = 1867 2 on 4 n. -
I 834°57 259'58 ... DA on 2 m. with 3.8-in, refr.
183976 26o 3o ... DA on 1 m. with Mr. Bishop's 7-in. refr.
1846'55 255°o3 1. 368 M on 3 n. -
No. 2095 = 2 39 Mens. Microm. Appendia I. = H v. 3 = 3 Lyrae, A B.
Discovered by H in 1779, on the same night as yielded to that indefatigable observer
another double star almost precisely similar, viz. & Lyrae. This was also one of Mr. OTTo
STRUVE's list for comparison of measures. Observers differ somewhat about the colours of
the components. - -
1782.36 P = 15347 D = 439s H. “White; the 2nd (B) a little inclining to red.”
1822.87 I 5o'oz 45'939 H and S on 2 n. “L, white; S, blue.”
1835°23 I49'81 45'770 2 on 5 n. “Major = 3’o, flava ; minor = 67,
alba.”
184o'70 149°52 45'85o O 2 on 3 n.
1848-59 149°7o 45'927 DA on 2 n. with 63-in. refr. A, pale or very pale
Ayellow ; B, light blue, or pale lilac.
No. 2097 = O > 525.
Discovered by Mr. OTTO STRUVE with the Pulkowa refractor. It is B. A. C. 6468.
From the faintness of the close companion it is extremely difficult to measure well. By
the favour of its discoverer I am enabled to give his measures along with my own.
1846.96 P = 12%52 D = #467 O > on 4 m. with 15-in, refr. by Merz.
1853'35 128-63 1.667 O > on 3 m. with the same.
1853.72 I 24'49 1864. DA on 1 m. with 63-in. refr. by Merz.
No. 2098 = 2, 2429 = H I. 58.
Discovered by H in 1782. It is rather difficult to measure correctly, and consequently
the discrepancies are too great to permit any certain conclusion as to change since its
discovery.
W/
1783.2 I P = 283°oo D = . . H. “With 460, near 2 diameters of L.”
1825' 57 29O'35 5'478 S on 2 m. with 5-in. refr. by Tulley. “Small,
- pale blue.”
1829:63 281-92 6°or H on I n.
1829.8o 289°47 5:32O > on 3 n, “Major = 8.3, alba.”
1841 '53 288-17 5'549 DA on 1 m. with Mr. Bishop's 7-in. ref.
Micrometrical Measurements of Double Stars. 4. I3
No. 2099 = X 2438 = H I. 43 = P XVIII. 287.
This very close and difficult double star was discovered by H in 1782 ; and though
the more recent measures give a difference of some 18° or 20°, it is doubtful whether the
difficulty of the object may not account for it.
M/
1782-67 P = 358% D = . . H. “Both pale pink”. “With 932, about
# diameter.”
1832 53 340-60 o'722 2 on 4 n.
1834°53 34. I'oo o:7 SM
1841'48 338'oz o°6 est. M on 2 n.
1841 80 335' I 2 o'65 est. DA on I n. with Mr. Bishop's 7-in. refr.
In H’s second Catalogue, Phil. Trans. vol. lxxv., the position is stated to be 88° 24′ n. p. ;
which = 35.8°40. But STRUVE has quoted it 355°4. -
No. 2100 = X 2461 = 17 Lyrae.
A delicate and elegant object, detected by STRUVE. It has not been much noticed; but,
from the few results we have, considering the difficulty of the measures, there seems to
be no sufficient evidence of relative motion.
183072 P = 33063 D = 3723 X on 3 m. “Major = 5·7, subflava ; minor,
9-8, subcaerulea.”
I 834' 5-5 332' 33 ... DA on I n. with 3.8-in. refr.
1834.79 33 I 2 2'9 SM “A, 6, light yellow ; B, 1 1, caerulean blue.
1838. 32 329'9 3-6 SM -
1848' 55 326'85 3.71 o DA on 1 m. with 63-in. refr. “A, yellowish ;
- B, blue.”
No. 2101 = 2 2470.
Discovered by STRUVE. No variation appears to have occurred since his first measures.
1829.78 P = 27 fºss D = 14923 X on 3 n. “Major = 6'7 ; minor = 8.2 ; albaº.”
1830-63 270.80 I 3'353 DA on 1 m. with 3-8-in. refr.
1848' 53 271-37 13°295 DA on 2 m. with 63-in, refr. “A, white ;
B, pale lilac.”
4. I4. Rev. W. R. DAWEs, Catalogue of
No. 2103 = X 2488.
The difference of about 3° between the result obtained by STRUVE, who discovered the
duplicity of this object, and by myself, affords no solid ground for suspecting any alteration in
the relative situation of the components; since in the results of STRUVE's observations on
three nights a difference exists of more than 8°, arising evidently from the difficulty of the
measures. Yet MXDLER's results differ from STRUVE's still more widely than mine, as
will be seen by the following epochs.
1829'O4 P = 318;3 D = #293 2 on 3 m.
1842-62 325 "O3 I ‘7 I4. M on 3 m.
1852°og - 3.29' I 3 o º M on 3 n.
1853'71 321-68 I-614 DA on 1 m. with 6%-in. refr.
No. 2104 = O > 371.
A very close and pretty double star, detected by Mr. OTTO STRUVE. By his kindness in
sending to me his measures, I am enabled to adduce them for comparison.
1845-69 P = 15273 D = oºzg M on I n.
1846'50 I 54." I 3 o'815 O > on 6 n.
1853-71 I 54' Io o:765 DA on I n. with 63-in. refr.
1857:27 I 53'49 o'733 SE on 2 n.
No. 2105 = 2 2491.
A close and rather difficult double star, discovered by STRUVE, from whose results my
own, obtained twelve years afterwards, do not differ sufficiently to make any real variation
probable; and MÄDLER's differ in the opposite direction.
1828.77 P = 206.65 D = I'o67 2 on 4 n.
1841 '4. I 2 I I ‘59 1.233 DA on 3 m. with Mr. Bishop's 7-in, refr.
1842'56 2O4'37 o’958 M on 2 n.
No. 2108 = 2 2523 = H III. 57.
Discovered by H. The measures recorded give no evidence of change, though they differ
more than might be expected. *
Micrometrical Measurements of Double Stars. 4. I5
1783-20 P = 14860 D = 7°oz H
1823: 53 I 53'43 6'938 S on I n. “Both bluish.”
1830.96 I 5 I '54 6.214 X on 5 m. “ Egregie alba.”
1840'5.8 148.70 6-641 DA on 1 m. with Mr. Bishop's 7-in. refr. “Very
- white.”
1841-62 I 52'47 6'494 M on 1 n.
184270 1 5 o'87 6'357 M on 2 n. (D on 1).
1846-41 I 5 I 32 HI on 3 m. with Mr. Bishop's 7-in. refr.
No. 2109 = 2 2525 = Cygni 22 (B).
Discovered by STRUVE. For so close an object, the mean results of measures by different
observers are remarkably accordant, though STRUVE's individual results differ among them-
selves to the extent of nearly 9°.
I 83 o'43 P = 25.5% D = *334 2 on 5 n.
1836-14 255'5.5 I'305 X on 2 n.
1840.62 25 5'5.5 1.25 est. DA on 1 m. with Mr. Bishop's 7-in, refr.
I 842°41 25 o'97 o'82 M on I n.
No. 21 10 = O > 378.
Detected by Mr. OTTO STRUVE, who favoured me with his measures for comparison
with my own. I am unacquainted with any others. .”
O Af : &
P = 282-70 D = 1.297 O > on 3 m. with 15-in. refr. by Merz.
287:45 I 452 DA on 3 n. with 63-in. refr. by Merz.
1846-o;
1851.65
No. 21 13 = O > 380 = x. Aquilae.
An excessively close double star, detected by Mr. OTTO STRUVE, who has also on some
occasions felt pretty sure of a third at a distance of about 14". Of this I have never been
able to obtain a glimpse; though I have frequently scrutinised this object under favourable
circumstances with my excellent 84-inch refractor, and also with Mr. LASSELL's 20-foot
reflector with the whole aperture of 24 inches, and with various reduced apertures to im-
prove the definition of the large star. If, therefore, the speck of light, which was estimated
of the 11th magnitude, were really a star, it must be of variable brightness. This object
Seems to have been but little attended to, and I am aware of few measures of it besides those
which were sent me by the discoverer for comparison with my own.
416 Rev. W. R. DAWEs, Catalogue of
I 84.5' 53 = 74°58 D = &592 O X on 4 n.
1848-59 77°og o' 525 DA on 3 m. with 63-in. refr.
1848-70 72°8o o'463 DA on I n. with Mr. Lassell's 24-in. refl. reduced to 14 in.
1853-71 74°9 I o'475 DA on 2 n. with 63-in. refr. (D est.)
No. 21 19 = O > 383.
Discovered by Mr. OTTO STRUVE, who has kindly communicated to me his observations
for comparison, the mean of which is as follows.
I 845°o7 P = 2%40 D = opio O X on 3 n.
1853-75 23-67 o'848 DA on 2 m. with 63-in. refr.
1858:22 2 I-75 o'761 SE on 2 n.
From the difficulty of the object, it must at present be doubtful whether the diminution
of the measured angle and distance should be accepted as the effect of real relative motion,
Or not. *
No. 2120 = O > 384 = P ×Ix. 263.
Of this close double star, also discovered by Mr. OTTO STRUVE, some measures were sent
to me by him for comparison with my own. I am not acquainted with any others.
1844° 16 P = 19670 D = o', ; O > on 2 n.
1848.60 19772 o'908 DA on 2 m. with 63-in. refr.
1853'73 197.26 o'990 DA on 2 n. with same.
No. 2125 = 2 2579 = H I. 94 = 3 Cygni.
A very beautiful and interesting binary system. The great inequality in the magnitudes
of the components, and the brightness of the larger, renders it a difficult object to see
distinctly, except in a fine state of the air. The smaller star has been suspected of variability;
but, though there appears to be some ground for this, yet great allowance must be made
for the effect on such an object of different conditions of the atmosphere, and it is certainly
a curious fact, that I have never viewed this star under a moderately favourable state of
the air without seeing the small companion plainly enough with apertures from 63 to
83-inches. It is difficult to account for its non-visibility in the powerful reflectors of HI in
1802 and 1804; since it was first discovered and readily seen with a much smaller instru-
ment in 1783; especially as at that time it was probably almost as far from the larger star.
But this is especially an object in which great perfection in the telescope is of far more
importance than large aperture, beyond about 6 inches. In July, 1825, SouTH, then ob-
Micrometrical Measurements of Double Stars. 4. I?
serving at Passy, with his extremely perfect 5-inch refractor by TULLEY, examined this
star on a remarkably fine night, in company with Mons. GAMBART, with various powers
from 181 to 787; but neither of the observers could detect any indication of the companion,
and it is evident, as the absence of elongation is spoken of, that the nature of the object
was not understood. This has been referred to as probably arising from variability in its
brightness: but I believe that if its actual distance from the larger star had been known
it could scarcely have escaped notice that, with a 5-inch aperture, the first bright ring round
the large star would pass through or over the smaller, and reduce its visibility to that of
a small dot rather brighter perhaps than the rest of the ring. STRUVE has on one occasion
noted the magnitude as 6'5; on most others as 8 or 8'5; and on two as 7. I have uniformly
noted it as either 8 or 9; and I believe the former to be the most correct.
//
1783.72 P = 71.65 D = . . H. “With 460, # the diameter of L.”
1802 and 1804. . . tº e H. No companion seen.
1826'55 40.65 I '91 o X on 2 n.
1830-27 36.8o I '74o X on 2 n.
I834:43 35'70 I-697 X on 3 n.
1836'52 3 I '92 I '8oo X on 4 n.
1837-78 3O'9 I 5 SM -
1839.66 27°42 I'5 est. DA on 2 m. with Mr. Bishop's 7-in. refr.
1840.67 25' I 9 e º DA on 2 m. with same.
1841'5 I 26-93 ... M on 3 n.
1841-89 23.75 I'667 DA on 4 n. (D on 1) with same telescope.
1842 '56 25-6 I '8 SM
1842-78 2 I 53 I 462 M on I n. “Höchst schwierig, aber sicher.”
1847-39 1670 ... & e DA on 3 m. with 63-in. refr.
1847-48 1879 I 320 M on 2 n.
1848.75 I 4°53 I '767 DA on 3 m. with same telescope.
1851-5 I I 1.56 I'652 DA on 2 m. with same.
185274 Io'78 I-683 DA on 2 m. with same.
1853-73 7° 33 I '768 DA on 3 m. with same.
1854: 56 4’3O I-688 DA on 1 m. with 73-in. refr. by Al. Clark.
No. 2147 = 2 2583 = H I. 93 = + Aquilae.
“A minute pretty double star,” as its discoverer, H, aptly terms it. A comparison of
results at different epochs since the first measurements proves that no change has occurred
either in position or distance.
1783-65 P= 12.É40 D= ".. H. “With 460, 3 diameter of L, or near ; diameter of S.”
1823.70 I 25*45 I '957 S on I n. (Angle diminished by 10°; having been misread.)
1825 61 I 23°45 I'549 S on 7 n. with 5-in. refr. by Tulley.
ROYAL ASTRON. Soc. VoI. XXXV. 3 H
4.18
Rev. W. R. DAWEs, Catalogue of
1829-96 P=1257; D="soz X on 6 n. -
1830-56
1831°7'o
1832°56
1836-81
1840-65
1841-62
1842-72
Discovered by H in 1781.
I 24'47
I 2.2"O
127'40
12 I-3
I2 I'47
I 23°23
123' 17
1825
I'5
I'68
17
1°301
I'474.
DA on 3 m. (D on 2), with 3.8-in, refr. by Dollond.
SM -
H on 1 m. with 5-in. refr.
SM.
DA on 1 n. with Mr. Bishop's 7-in. refr.
M on 2 n.
M on 2 n.
No. 2148 = X 2585 = H II. 30 = % Sagittae.
Considering the distance of the components, the discordances
in the recorded measures of the angle are extraordinary, but may perhaps arise from the
There seems to be no good ground to suspect variation.
obliquity of the position.
1781-88 P=30:17 D= 883
18oz'45
1822-65
1823-69
1829:63
1830-56
1831 Io
1831'59
1838-67
1841' 20
1842°43
1848'58
31 o'68
309°25
3I4'53
318:47
31 2-8o
31 2-83
3 I 3°4.
31 2 3
312'47
3 I2°23
3 I2'47
8:58
8-8 I 8
981
9°312
8:492
8-9
8-6
9°o29
8'902
H
H
X with the smaller Dorpat instruments.
S on 2 n. “Large, white ; small, blue.”
H on 1 n. with 5-in. refr.
DA on 2 n. (D on 1) with 3.8-in, refr.
> on 6 n. “Major = 5·7, albaviridis; minor=8-8, caerulea.”
SM. “A, 5, silvery white; B, 9, blue.”
SM
M on 2 n.
DA 2 n. with Mr. Bishop's 7-in. refr.
DA on 1 m. with 63-in. refr.
No. 2151 = O > 386.
Discovered with the Pulkowa refractor. Except one night's observations by MADLER, I
am unacquainted with any other measures of it than those of its discoverer and my own.
1844-14 P = 74°14 D = *945 O X on 2 m.
1847°73
1848' 55
83.76
78.62
o°75
M on I n.
o:967 DA on 1 m. with 63-in, refr.
Micrometrical Measurements of Double Stars. 4 IQ
No. 2152 = O > 387.
Discovered by Mr. OTTO STRUvE, by whose kindness I am enabled to adduce his measures
for comparison. There seems to be a typographical error in the second position by SECCHI -
quoted below. The proof of binary character is decided, though the differences in the
distance are rather unaccountable. &
1844. I7 P=129°40 D=&soo O > on 2 n.
1847.73 I 19:38 o:60 M on 1 n. (Z-180°).
1851.97 103-83 o'470 O > on 3 m.
1853.75 8973 o'53est. DA on 3 m. with 63-in. refr. (Da mean of estimates on 3 n.)
1855-63 90'70 o'57o O > on 2 n.
1856.83 9 I'90 o' 3 SE on I n. .
1859-61 198:21 o:25 SE on 1 n. (Qy. Should the angle be 98°21 ?)
1861' 22 78.35 o:605 O > on 2 n.
No. 2155 = O > 388.
Another of Mr. OTTO STRUVE's discoveries; and it seems surprising that it should
have escaped the previous researches at Dorpat. Here again we find a very large and
unaccountable difference between MÁDLER's results and those of OTTO STRUVE and myself.
1846'50 P=14; so D=3718 O X on 4 n.
1847.73 I 56-93 3.888 M on 1 m.
1848-51 13978 3-854. DA on 1 m. with 64-in. refr.
1853-73 I 39-98 DA on I n, with Same.
1854'72 . I 39°43 3.888 DA on 1 m. with 73-in. refr. by Alvan Clark. A 3rd star;
P = 138°4: ; D = 25"--.
No. 21.58 = X 2603 = H I. 8 = a Draconis.
Discovered by H in 1780. An elegant little double star, supposed by the difference
between his measures in 1781 and 1804 to have a considerable orbital motion. Subsequent
observations however have proved that the earlier measures must have been erroneous to
the extent of about 20°. It seems surprising that both H and S, in measuring this object
with the excellent 5-foot and 7-foot refractors, of 3-8 and 5'o inches aperture respectively,
should have found such extreme difficulty in the observations as to have recorded that
“our observations were each made without the other's knowledge ; and neither observer
thought the slightest confidence could be placed in his measures; it being even uncertain
4.2O Rev. W. R. Dawes, Catalogue of
whether the small star had really been seen at all, or in lieu of it some optical illusion.”
On the contrary, I find that, with a telescope of the same size as the smallest used by
those eminent observers, I experienced no extraordinary difficulty in obtaining the measures
and on the last of the three sets recorded in 1830, the extreme difference among 6 observa.
tions of position is only 1° 15. Yet I am not aware of the smaller star having been ever
suspected of any considerable degree of variability:—though, on turning to STRUVE's
observations on 6 nights, I find he has on one noted the magnitude as 8-5, and on another
as 7. On the other four it is called 7.5. -
1781-81 P=333.23 D="..
H. “With 278, not a diameter of L."
1804:39 35448 H
1823'58 355°35 2'590 H and S on 2 n. (D on 1).
1830.67 353'25 3.27 H on 1 m. with 5-in. refr. by Tulley.
1830.67 354'77 3'o95 DA on 3 n. (D on 2) with 3.8-in. refr. by Dollond.
1832'44 354' 53 2790 X on 6 n. “Major = 4'o, flava ; minor = 7.6 carulea.”
1833.68 354.6 3' I SM. “A, 5}, light yellow ; B, 9}, blue.”
I 84. I'54 355-67 2.693 M on I n.
1843.78 353 I 7 2.844. DA on I n. with Mr. Bishop's 7-in. refr. and Pr. Cr. M.
- “A, yellow ; B, blue.”
1846-77 356-3 3'o SM
1848-67 356:48 2-828 DA on I n. with 63-in. refr. “A, yellow ; B, purple.”
No. 2160 = A. C. 12.
Discovered by ALVAN CLARK in 1854, who sent me soon afterwards a notice of its
existence, but without any intimation of its character. The only measures of it which
I am acquainted with besides my own are by SECCHI on one night. See Catalogo di 1321
Stelle Doppie, p. 21, col. 2, where it is called “Nova 2 ;” and a reference is made to
Loomis's Recent Progress in Astronomy. The star is BESSEL (WEISSE), xix. 1273.
DA on 1 m. with 73-in. refr. by Al. Clark.
SE on 1 n.
1854.66 P=333.76 D=ć'863
1859-60 335°oo o:8 II
No. 2161 = X 2606.
One of STRUVE's discoveries. There is no evidence of change since its discovery.
1832°o7 P=13íoo D=#193 2 on 3 n.
1842-42 I 33°75 1.219 M on 2 n.
1848.68 I 32°7o 1.191 DA on 1 n. with 63-in, refr. and Sph. Cr. M.
1853.81 132-88 1.199 DA on 1 n, with same telescope and P. W. M.
Micrometrical Measurements of Double Stars. 421
No. 2163 = O > 395 = 16 Vulpecula.
An exceedingly close double star, discovered by Mr. Otto STRUve. The discrepancies
in the results probably arise from the difficulty of the observations.
1845'34. P = 7#80 D = &637 O X on 3 m. Communicated by letter.
1845'79 67:43 o'45 M on 1 h. ~. -
1847'73 74°25 o'45 M on I n.
1852'60 8o'66 o:57est. DA on 2 n. with 63-in. refr.
No. 2165 = X 2626.
Discovered by X. The measures present no evidence of change.
1831: 12 P = 12#67 D = “173 2 on 3 n.
1842'71 125'98 I I 82 M on 2 n.
1853-89 122°40 1' 165 DA on 1 n. with 63-in. refr.
No. 2166 = X 2625 = H III. 63 = P XIX. 396.
Discovered by H in 1782, since which date it is probable no change has occurred.
The small star is very faint; and as the declination exceeds 13° S, it is difficult to mea-
sure well in these latitudes. r º:
1782.68 P = 1ózo D = 1433 H
1827.67 I I-90 13:32O > on 3 n. “Major = 7'o, flava; minor = 1 o'8.”
1841-62 I 3°45 tº e D on I n, with Mr. Bishop's 7-in. refr.
No. 2167 = O > 398.
One of the Pulkowa discoveries. Having been lately favoured with measures there
obtained, we have the following for comparison.
1845-68 P = 632, D = &84 M on I n,
1846'42 84:63 o'903 O X on 3 n.
185375 84.78 I'o.45 DA on I n, with 63-in. refr.
The discrepancy in MÄDLER's angle is surprising.
422 ... Rev. W. R. Dawes, Catalogue of
No. 2168 = X 26.40.
Discovered by X. Though my result differs considerably from his, yet the faintness
of the small star renders it doubtful whether the difference is the effect of relative motion;
and I am not aware of any other measures. The gradual diminution of the angle, however,
manifested in STRUVE's measures seems to render it probable that my still smaller angle
may not be altogether the effect of error. It may be well to record the result of each
year's observations, instead of giving STRUVE's mean only.
1831.87 P = 30’s D = 4% X on I n. “Major = 6'o, egregie alba; minor = 99.”
1832'oz 28:8 4'95 2 on I n.
1833'38 24'9 5°or X on 2 n.
1841-8o 23'28 4:991 DA on I n. with Mr. Bishop's 7-in. refr.
No. 2169 = X 2644 = H II. 96 = Pxx. 26.
A star of fully the 7th magnitude, the duplicity of which was discovered by H in 1783.
Though the results of measures do not quite agree, there seems to be no sufficient reason
to conclude that any real change has occurred.
//
1783.70 P = 21380 D = ".. H. “With 460, full 2 diameters.”
1823.65 208:20 4: I oo H and S on 4 n.
- 1830.79 - 207-57 3'342 > on 4 m.
1832-8o 2O79 3.5 SM
I841'54 2 I 2 I 3 3'576 M on 2 n. - -
1842°4 I 21 o'24. 3.368 DA on 4 n. (D on 2) with Mr. Bishop's 7-in. refr.
1842*7 I 2 I I ‘O4. 3'355 M on 2 n. ... " -
1845-64 21 o'93 3'452 HI on 4 m. (D on 2) with same telescope.
No.: 2.173 = O > 399.
Discovered by Mr. OTTO STRUVE, who has kindly sent me his measures for com-
parison. The difference in MADLER's distance is enormous.
1845-68 P = 27; ot D = #o;3 M on I n.
1846-76 278-82 4'495 O 2 on 5 n.
1854'o6 279-67 4:612. DA on 2 n.
Micrometrical Measurements of Double Stars. 423
No. 2175 = 0 × 400.
One of the Pulkowa discoveries; and the measures of it having been kindly com-
municated to me, I am enabled to compare my own with them. There can scarcely be
a doubt of the binary character of this object.
1845.73 P = 33:90 D = &640 O X on 3 n.
1851.81 328.8o o' 560 O X on I n.
1853-89 32 o' 55 o:65 est. DA on I n.
1856-64 32O'50 o°62o O > on 2 n.
1861-62 3 18:oo o' 62o O X on I n.
No. 2176 = X 2690 = H III. 16 = Pxx. 177, 178.
Discovered by H as a double star 1779. As such it was measured by H and S in 1822;
and also by >, in 1829 and 1832,- on two nights in each year. On three of these four mights
a power of 320 (nominally, but in fact only 254) was employed, and on the fourth a power
really 420, but called 480. On no one of the four was any suspicion excited of any elongation
of the star B. Yet on the first night on which I measured this object with Mr. BISHOP's
7-inch refractor (1840, Oct. 27) I perceived that B was unquestionably wedge-shaped, and
succeeded in obtaining moderately good measures of it. This circumstance was soon after-
wards published in the Monthly Notices of the R. A. S. (Vol. v. No. 9). Yet MXDLER, on no
fewer than 16 nights from 1841, has obtained measures of this object as double only; not the
slightest intimation being given of the smaller star being in the least elongated At first its
non-observation by STRUVE was reasonably enough attributed to its being at that time very
probably nearly or quite round, and having since then slightly separated. Subsequent
observations, however, appear to negative such a supposition; as neither the angle nor the
distance has perceptibly varied. I believe, therefore, that the real reason why its duplicity
escaped STRUVE's excellent telescope and keen eye is simply this; that wide and easy objects,
such as is the double star H III. 16, were usually measured on indifferent or even bad star-
light nights. Still, it is rather remarkable that the night on which the star B was discovered
to be double at South Villa is stigmatized as being one of “bad vision.” Though there is no
evidence of motion in A and B, a few epochs may be selected for comparison of measures.
1842:7 I
1779-88 P = 26330 D = 12"so H
1822:58 255-63 I 5'484 H and S on I m. with 33-in. refr.
1831-26 256'27 I4, 190 2 on 4 n.
I835'91 256' I I4’3 SM
1841' 37 256'46 14:563 DA on 4 m. with Mr Bishop's 7-in, refr.
I84 I '54 255'73 13.86 M on 2 n. (D on 1).
254'99 I 3-674 M on 2 n.
424.
Rev. W. R. DAWEs, Catalogue of
A very close double star discovered by STRUVE.
1845°38
185 I-74
1854.46
1841'56
1842:58
1843–70
1845'38
185o 19
1831.78
I84I'54
1842-74
1854,74
P = 25617
255° Io
254*74.
D = 14677
14:51 I
I4°44'o
O X on 3 m. Communicated by letter.
M on 5 n.
M on 3 m.
B and C = D 1 = O > 407 = Pxx. 177.
O
2 I I-39
2 Io' 5
2 I I-62
2O4°oo
211:29
E 76°;2
74°53
76.5o
75-60
&6 5 est. DA on 9 n. with Mr. Bishop's 7-in, refr.
o:7 SM
o'65 est. DA on 2 n. with same tel, and Pr. Cr. M.
o’ 5 Io O X on 3 n.
DA on 4 m. with 63-in. refr.
o'58 est.
D =: 6798 -
O'925
o'789
I 'OO I
No. 2195 = 2695 = Vulpeculae 94 (B).
There seems to be no evidence of change.
> on 5 n. “Albaº.”
M on 2 n.
M on I n.
DA on 2 m. with 73-in. refr. by Al. Clark.
A, light yellow; B, purple.
No. 2197 = X 2698.
Discovered by SouTH. No change appears to have occurred.
1825-63
1828-77
1830.63
183 I'30
1841:63
1843-62
1854'70
O
P = 301.33
303'28
3O5°4O
3O5'55
3O3'59
303'67
3o4'81
D = £468
4’75
4' 507
4 II 5
4’332
4:561
4’396
S on 2 n.
H on I n.
DA on 2 m. with 3'8-in, refr.
> on 4 n.
DA on 3 m. (D on 2) with Mr. Bishop's 7-in.
refr. and P. W. M.
DA on I n. with same telescope and Pr. Cr.M.
DA on I n, with 73-in. refr. by Al. Clark.
No. 220.2 = X 2701.
Discovered by STRUVE, and unchanged since his first measures.
1829.76
1830. I4.
1840-21
1846'51
O
P = 2 I 8:8o
222*I 8
22 o'46
2 19:06
M/
D = 2-130
2'30
2°5 Io
2 on 3 m.
H on 2 n. (D on 1 ; Z + 180°).
DA on 2 m. with Mr. Bishop's 7-in. refr.
HI on 2 m. with same telescope.
Micrometrical Measurements of Double Stars. 4.25
No. 2204 = X 2708 = H. N. 87.
An interesting double star discovered by H in 1782, and entered among his “New Double
Stars.” It was observed in 1823 by H and S as “Nova,”—not being recognised as having
been previously detected ; and it is curious that having been measured on one night by H,
and on another by S, the former placed the smaller star in the n.f quadrant, and the latter
in the n. p.:— the difference of the results amounting to no less than 3°62, though the
observations were only 6 days apart. For so wide a star, and having a position so near the
vertical, it is an extraordinary instance of personal difference. Considerable relative motior
is indicated by the results, and the object is worthy of assiduous attention. The larger star is
gyellow, and the smaller purplish or blue.
1823.68 P = oºz D = 9562 H and S on 2 n.
1828.76 355'o6 Io'45 H on 2 n. (D on 1) with 5-in, refr.
I 828-8o 355°oo Io'48 > on I n.
1830-71 352.82 I 1.239 DA on 3 n, with 3.8-in, refr.
1831-81 352'23 I I'o27 X on 3 n.
I832° 34 352' 34. I 1.318 H on 3 n.
1832°56 352°o 5 {e tº DA on I n.
1833.87 35 I’ I 5 I I'46 DA on I m.
I 834'55 350-55 11704 DA on 5 m.
1835'79 349'30 I I'975 X on 2 n.
1836-58 348-38 12.1 57 2 on 3 n.
1837.75 347°42 I 2.608 DA on 2 n. with 3-8-in, refr.
1837.82 347°5 O 12:460 X on 1 n. “Major, egregie flava ; minor,
carzzlea.”
1839.79 346-87 12:913 DA on 2 m. with Mr. Bishop's 7-in, refr.
1839.87 346.8o 12:840 O > on 2 n. with 15-in. refr. at Pulkowa.
1840.67 345.93 13'161 DA cn 3 m. with the 7-in, refr.
1841 '63 345-64 13:463 DA on 2 n. with same.
1842-65 345 ‘O2 tº º DA on I n. with same.
1843.86 342'20 13-694. DA cn 2 n. with same and Pr. Cr. M.
1846-78 344." IO - I 4'42 O > on I m.
185 I-79 342 "OS I 5'762 F on 5 m. with 44-in, refr.
185 I-90 342.5o 15-66 O > on 1 m.
1853-82 34o 52 16-oo8 DA on I n, with 63-in, refr.
No. 22 15 = O > 410.
A very close double star discovered by Mr. OTTO STRUVE, who has favoured me with his
measures, and enabled me to produce the following series, which seems to indicate some change
in the angle. -
ROYAL ASTRON. SOC. Vol. XXXV. 3 I
426 Rev. W. R. DAWEs, Catalogue of
1846'93 P = 28.86 D = &425 M on 2 n.
1847°59 27°44. o:638 O > on 5 n.
1853-82 207.75 o'530 DA on I n. with 63-in. refr.
1857' 53 2O4'70 O'4o SE
1858:13 I7-95 o:625 O > on 2 n.
No. 2216 = X 2716 = H II. 98 = 49 Cygni.
A fine double star, discovered by H in 1783. The larger star is yellow; the smaller, blue.
The components appear to be relatively fixed.
//
1783.71 P = 58%.o D = H. “With 460, 2} diameters of L.”
1830-61 - 49'42 2:736 X on 5 n.
1832-65 49'2 2-9 SM
1834°59 48°2O 2-772 DA on 2 n. with 3.8-in. refr.
1838-86 48.8 3°2 SM
1841'5o 5o'88 2.705 M on 5 n. (D on 3).
1842°o5 49°47 2.8.19 DA on 4 n. (D on 2) with Mr. Bishop's 7-in.
refr. and P. W. M.
1843.86 51' 17 2.858 DA on 2 n. with same telescope and Pr. Cr. M.
1850'4. I 49' 19 2.794 DA on 2 n. with 63-in. refr.
1850-65 5o'73 2'949 M on 4 n. (D on 2).
1851'91 48-69 3' I I 3 M on 4 n.
No. 2224 = 2 2723 = Delphini 43 (B).
One of STRUVE's discoveries; a neat and rather close object. Though the discrepancies
in the results are considerable, they probably arise only from the difficulty of the measures.
1831-71 P = 85.62 D = #490 X on 6 n.
1841-73 83-20 o'915 M on I n.
1842-70 88-70 I 134 M on 3 m.
1853'74. 87.78 I'479 DA on 2 n. with 63-in. refr.
No. 2226 = X 2725 = H II. 66.
Discovered by H in 1783. The indications of change are very slight and doubtful.
A/
O
1783-33 P = 34870 D = ... H -
1821-84 355°90 4: I Io X with the smaller instruments at Dorpat.
Micrometrical Measurements of Double Stars. 427
1825'08
1829.8o
1841' 16
1841-57
1842-74.
1845-47
1846'43
1854'32
O
P = 354'98
358°o 3
355°77
356-39
356-97
357.60
358:13
356.86
D = 4'979
4°237
4-656
4°779
4' 54.2
4'435
4’745
S on 5 n, with 5-in. refr.
2 on 3 n.
DA on 4 n. (D on 1) with Mr. Bishop's 7-in. refr.
M on 4 n. -
M on I n.
HI on 2 n. (D on 1 with Mr. Bishop's 7-in. refr.)
HI on 4 m. with same telescope.
DA on 3 m.; on 2 m. with 74-in. refr. by Al. Clark.
No. 22.33 = O > 413 = A Cygni.
A close and beautiful binary discovered by Mr. OTTO STRUVE, who has recently fur-
nished me with his observations of it for comparison with others. On one night MADLER
observed an object which he has called O > 413 ; but the angle recorded is so far from the
true one, that the star cannot have been seen really elongated; though it might reasonably
be expected that the Dorpat telescope of 9-6-inches aperture would be capable of even
separating such an object.
1843°74 P = 1zoº;3 D = &631 O > on 7 m. with 15-in. refr.
1843°74 I 3 o'o o:7 SM
[1847.82 36.81 o' 3 M on 1 n.]
1850'47 Io9'o2 o' 557 O > on 9 n. (D on 8).
185 I'99 Io9'86 o:7 est. DA on 1 n. with 6}-in. refr.
1853-88 99" Io o:7 est. J on 2 n. with 6'3-in. refr.
1854'07 Io9'45 o:647 DA on 5 n. (D on 2; est. on 3) with 6; and
73-in. refr.
1856, 18 97.65 o:625 O > on 2 n.
1860:37 92.85 o'687 O > on 4 n.
No. 2239 = X 2729 = H I. 44 = 4 Aquarii.
An excessively close and difficult binary star, discovered by H in 1782. Its small
altitude in these latitudes renders it very difficult to obtain accurate measures; yet those
which have been recorded show that its distance has diminished, and the direct motion
greatly accelerated, since STRUVE's first observations. Doubt has been cast upon HERSCHEL's
first measures in 1782; but I should be more inclined to question the accuracy of those in
18oz. There is a much larger difference between STRUVE's measures under the mean
date 182976, and those by Sir J. HERSCHEL with the 20-foot reflector in 1832, than can be
accounted for by the interval of less than three years: but as STRUVE's results on different
nights disagree among themselves to the extent of 18°, it seems probable that their mean
428 - Rev. W. R. DAWEs, Catalogue of
result is too small. This object is worthy of being assiduously attended to by those who
possess telescopes competent to deal with it.
//
1783.56 P = 3 1°so D = . . H. “With 460, almost in contact, or at most
5 5 I 5 4. *
- # diam. of S.”
1802-66 28'90 tº e H. -
1829.76 24°52 o'743 X on 5 n. (1825–1833).
1832-73 46.65 o'67 est. H on 2 m. with 20-foot reflector.
1834-69 45°o o' 5 SM
1836-o; 46-27 o'4. Io 2 on 3 n.
1839'68 62-17 . . . DA on 2 m. with Mr. Bishop's 7-in, refr.
1840.72 65'53 o:6 est. DA on 2 m. with the same.
I 84 I-49 24'61 o°6 est. M on I n. -
1841-8o 72.75 e G DA on I n. with same telescope.
1842.82 27°23 o'45 est. M on 2 n.
1843.76 - 81-73 tº º DA on 1 m. with same telescope and Pr. Cr. M.
1851'91 Single? gº º X on I n, with I 5-in, refr. at Pulkowa.
1853.70 95'90 o'5 est. DA on I n, with 63-in. refr.
1854°75 I or 70 o'3 est. DA on 1 m. with 73-in. refr. by Al. Clark.
It is difficult to account for the extraordinary discordance of MÁDLER's results with the
Dorpat refractor. I can hardly suppose that the other observations are all wrong.
No. 2247 = X 2730 = S 766.
Discovered by STRUvE, and also by SouTH at Passy. Considering the distance of the
components, the discrepancies in the angles are rather large; yet it seems very doubtful
whether they arise from orbital movement.
1825-61 P = 333.5% D = #998 S on 2 n.
1828:30 34 o'o 5 4' 171 H on 2 n.
1830-27 339°2O 3'34o 2 on 5 n.
1846'51 335'77 • e HI on 2 n. with Mr. Bishop's 7-in. refr. "
1853-71 335-61 3’546. DA on 1 m. with 63-in. refr.
No. 2248 = O > 415.
Discovered by Mr. OTTO STRUVE, whose measures, communicated to me by letter, are
the only ones beside my own that I am acquainted with.
1846'56 P = 23#90 D = 3%26 O X on 5 n.
1847.91 238°45 3'394. DA on I n.
1853-71 239. Io 3'361 DA on I n.
The differences are unusually large for the distance; but they may perhaps arise from
the obliquity of the position.
Micrometrical Measurements of Double Stars. 429
No. 2250 = O > 416.
Through the kindness of the discoverer, I have lately received his measures of this very
easy object; and we, therefore, have the following for comparison.
1846-13 P = 14373 D = 6'887 O 2 on 3 m.
1847.82 14378 6, 196 M on 1 n.
1853-89 I4.3°57 7'o.47 DA on I n.
1857'74 I43°30 7'o6o O > on I n.
No. 2251 = O > 418.
Another of the Pulkowa discoveries. The measures made there were communicated to
me by letter.
I 845’74 P = 29395 D = 6058 O X on 4 n.
1848.68 II 5"93. o:609 DA on I n, with 63-in, refr. and Sph. Cr. M.
1857' 53 I 14.86 o'772 SE on I n.
1859-61 I IO-4. I o'727 SE on I n. “Doubtful whether n. p or s..f.”
No. 2252 = O > 423.
Of this neat little double star, Mr. OTTO STRUVE has recently favoured me with his
observations for comparison. .
1853.06 P = 8:32 D = 2868 ox on 6 n.
1853-77 78.29 2.860 DA on I n.
No. 2253 = 2, 2737 = 1 (a) Equulei, A B.
The duplicity of this object was discovered by H in 1780; and as a double star only it
was observed by H and S, and by STRUVE during the years 1825, 1829, 1831, and 1832.
But in 1835, with a power of 420 (nominally 480) he detected a decided elongation of the
larger star, yet with the nominal powers 8oo and I ooo (really 682 and 848) on the 9'6-inch
Dorpat refractor, the components could only be brought into contact. The magnitudes of the
three were judged by STRUVE to be, A = 5.7; B = 6.2, subflavaº ; and C = 7. 1, albacinerea.
An increase of distance has certainly occurred in the close pair; and a very small diminution
of angle is probable in both sets.
43O
Rev. W. R. DAWEs, Catalogue of
1835-67
1838.83
1839'69
1840'66
1841-61
1841-82
1842-72
1842.82
1843°77
1847.63
1848-67
1850.75
1851.72
1853-8o
1853.83
1854.77
1781-81
1823'58
1833'39
1833-77
1838.83
1841' 16
I 84I '54
1842.76
1843'79
1849-26
1851-73
1851-96
1853.8o
1854-77
1854.89
This close and pretty double star was detected by H in 1783.
O
P = 294°o4.
29O'o
286.33
285.75
295'55
29O'90
292'97
287-85
285'79
287-oo
287:20
29O'42
287-51
291 II
285.26
29.077
8:35
79°35
78-07
77-6
78.1
76'95
77'34.
77'99
76-73
76'94
76-41
76-64
76°46
75.65
76°43
A + B
A and B.
o' 5
o'7 est.
o'7 est.
o:613
o'598
o' 527
o:7 est.
o:660
o'738
o:872
I of 3
o'787
o'835
O'97o
o’930
2.
//
D = 9.375
I 2°374
1 o'856
Io'7
I H "2
Io'753
Io. 52
1 o'502
II “249
1 o'864
I o'245
Io'763
I O'445
9'976
Io'605
No. 2273 = 2, 274.1 =
D = o's; est. 2 on 5 n.
SM
DA on 1 m. with Mr. Bishop's 7-in. refr.
DA on 2 m. with same.
M on 4 n.
DA on 2 n. (D on I) with same. .
M on 2 n.
DA on 1 m. with same.
DA on 2 n. (D on 1) with same tel, and Pr. Cr. M.
DA on 1 n. with 63-in. refr. Dist. with Sph. Cr. M.
DA on 2 m. with same telescope and P.W. M.
M on I n.
M on 3 m.
M on 2 n.
DA on 3 m. with 63-in. refr.
M on 3 n.
and C = H III. 21.
H
H and S on I n.
2 on Io n.
SM
SM
DA on 3 n. (D on 1) with Mr. Bishop's 7-in. refr.
M on 3 m. (D on 1).
M on I n.
DA on I n. with Mr. Bishop's 7-in. refr.
M on 2 n.
M on 2 n.
DA on 2 n.
M on 2 n.
J on 3 n.
DE on 5 n. with 53-in. dialytic refr.
H 1, 97 = Cygni 280 (B).
Though the difference
between the angle as measured by him and by subsequent observers amounts to about 1 o’,
yet there is room for much doubt whether any change has actually occurred. This arises
Micrometrical Measurements of Double Stars. 43 I
in great measure from the very considerable discordances in the results obtained, not only
by different observers, but also in some instances by the same observer near the same epoch.
SouTH bestowed much pains on this star when observing at Passy in 1825 with his fine
5-inch refractor, whose optical power was amply sufficient to deal with it; yet different
sets obtained within a few days disagree to the extent of between 7° and 8°l This object
also affords a striking instance of the uncertainty of telescopic estimations of magnitude by
some observers. The star is visible to the naked eye, and was noted by STRUVE as com-
posed of “Major = 6'o, minor = 7.3;” and ARGELANDER has entered it as of the 6th. Yet
South estimated the components as 8 and 9, and 8% and 9, on the two finest nights out of
five It would be highly desirable to obtain some trustworthy measures, in position especially,
that the question of orbital motion may be satisfactorily settled.
//
178373 P = 4360 D = . . H. “With 460, # diameter of S.”
1825 66 32.85 2'449 S on 5 m. with 5-in, refr. by Tulley.
1828' 55 36'24. I'41 H on I n. with same telescope; O. G. pinched in its cell.
1829.61 34°22 2.89 H on 3 n. (D on 1) with same telescope, in same condition.
1830:63 33°67. I '806 H on 2 n. Same telescope. O. G. released.
183 o' 57 32-85 2'419 DA on I n, with 3.8-inch refr. by Dollond.
I 83 I-49 35'83 I '93O 2 on 3 n.
1831-62 33°25 1:76 H on 1 m. with 5-in. refr.
1833°69 34-6 2 ” I SM
1834'50 32°o 5 ... DA on I n. with 3.8-in. refr.
1841-8o 32'27 zºo.36 DA on 1 m. with Mr. Bishop's 7-in. refr.
1841'48 33-64 2-188 M on 4 n.
1846'98 32°2O ... DA on I n. with 63-in. refr. by Merz.
1847.91 32:28 ... DA on I n, with same.
1851-85 34°9 I I ‘7 I 5 M on I n.
No. 2276 = X 2744.
Detected by X. There is some appearance of a very slow retrograde movement in position;
but in so close a star, a difference of 5° is perhaps too little to merit confidence.
1830, 16 P = 19634 D = #526 2 on 5 n.
1841:63 188'54 1753 M on 2 n.
1842-73 187.84 1.596 M on 2 n.
1848.68 185-85 1.429 DA on 1 m. with 63-in. refr, and Sph. Cr. M.
No. 22.77 = X 2751 = Cephei 83 (B).
A close and neat double star, discovered by X. There appears no evidence of change.
1828-64 P = 345%. D = #42 H on I n.
1831.96 344 IO I '860 X on 4 m. “Egregie alba.”
4.32 Rev. W. R. DAWEs, Catalogue of
O //
1832.58 346'73 2:46 H on I n.
1834-60 345'58 1-628 DA on 1 m. with 3.8-in refr.
1837-68 347'70 1'527 DA on 1 n, with Mr. Lawson's 7-in. refr. by
Dollond at Hereford.
I 8+2'41 346 53 1.65 M on 1 n.
1846'98 347°42 •,• DA on 1 m. with 63-in. refr.
1853-88. 347°16 1809 DA on 1 m. with same. Both remarkably white.
No. 2279 = X 2758 = H IV. 18 = 61 Cygni.
One of the most remarkable and interesting of double stars, of which both the components
possess an extraordinary large proper motion, and also a large and well-determined amount
of parallax. The nature of their relative motion has been carefully investigated by STRUvE,
who arrived at the extraordinary conclusion that the movement for the previous century had
been performed in a straight line. It seems to follow that the apparent change of position and
distance has arisen from the slight difference of proper motion. From the very close agreement
of the amount of the proper motion in both stars they appear to be physically connected, or
at least at nearly the same distance from the solar system. A selection from the very
numerous observations of these stars will suffice to exhibit the direction and the amount of
their relative motion. Both are deep yellow or golden ; the smaller having the deeper colour
of the two.
1781-90 P = 53.82 D = 16833 H . .
1821-62 84'38 I 5"o2 2 with the smaller instruments at Dorpat.
1822'90 84.68 I 5'425 H and S on 4 n.
1825'70 86-93 I 5'444 S on 7 n.
1828-52 89°35 I5'429 H on 4 n. (D on 3).
1830-56 90'82 I 5.613 H on 3 n. (D on 2).
183 o'66 90°33 I 5'699 DA on 2 n.
1830-81 90°5 15-6 SM
1832-65 92°3 I 5'4 SM
1832.77 92°o5 I 5'79 2 on I m.
1833.8o 92°47 15'88o DA on I n.
1834.62 93'33 16' 121 DA on 2 n.
1834-76 93°2 I6'2 SM
1835'59 93-6 15.8 SM
1835.65 93-83 I 5'967 X on 6 n.
1836. 57 94'4o 16'o6 o X on 5 n.
1837'56 9488 16-201 DA on 2 n. (D on I).
1837-65 95' I 16:3 SM
1837-71 95°45 I 5'913 2 on 3 n.
1839'69 96.3 16' 3 SM
Micrometrical Measurements of Double Stars. 433
1839.75
184o'73
1841 °49
1841-87
1842-62
1843-76
1843-98
I844:34
1846-87
1848'o'ſ
1848:30
1848-49
1850-88
1850'94
1851.81
1851'90
1852.68
1852.76
1853' 13
1853'26
1853-8o
1853-89
I 853-94
1854' 55
I 854'73
Detected by STRUvE and SouTH.
none of change in the position, as will appear by the following series.
1825-61
1828-83
1829.84
1831 '91
1835.63
1837.77.
1841 5o
1841-67
O
P = 96.07
97' 25
98'53
97'94
99°o 3
98’90
99.69
99'42
I oo'97
99.8
IoI '95
I of '47
Io9'87
Io9'o6
103.67
Iog'66
I o4-69
I O4’3O
IO4'45
I O4’39
Iog'7
IO4'73
I O4'85
Io; oz
Io; 58
\ O
P = 222.85
223°40
223'90
223°ol
223'57
224°oo
22270
223'90
M/
D = 16:578
I6'405
16°491
I6' 553
16.860
16.78o
I6'68o
17'o'72
16-4
17°oo
17: I Io
I 7'o'4. I
16:797
17:32O
16:907
17: I I 4
I 7'405
16:905
17:248
17'o
17-68o
17:284
17:634
17:290
DA on 2 n. with Mr. Bishop's 7-in, refr.
DA on 2 m. with same.
M on 5 n. (D on 1).
DA on 1 m. with same telescope.
M on 4 n. (D on 1).
DA on 1 m. with same telescope and Pr. Cr. M.
DA on 2 n. with same telescope and P.W. M.
O X on 4 m. with 1 5-in. refr.
DA on 2 n. with 63-in. refr.
SM -
DA on 2 n. with same.
O X on 3 n.
DA on 2 n.
M on 4 n.
O X on 3 n.
M on Io n. (D on 9).
M on 6 n.
J on 2 m. with 6'3-in, refr.
M on 5 n.
DA on 2 n.
SM
J on 2 n. with 6.3-in. refr.
M on Io n.
M on 5 n.
DE on 7 n. “A = 5' 1, jaune orange ; B = 6'4,
orange parfait.”
No. 2295 = 2 2760.
//
D = 14’324.
I 3 '840
I 3'490
I 3°42O
I 2'957
12767
I 2'425
12’ I 52
There is evidence of a diminution of distance, but
S on 2 n.
X on I n.
H on I n.
2 on 3 m.
2 on 3 m.
2 on 3 m.
M on 3 n.
DA on 1 m. with Mr. Bishop's 7-in. refr.
ROYAL ASTRON. SOC. WOL. XXXV. 3 K
434. Rev. W. R. DAWEs, Catalogue of .
1843'82 P = 223:42 D = I 1987 DA on 3 n, with same telescope and Pr. Cr. M.
I 85o'94 223°73 I 1'405 M on 4 n. (D on 3).
I 85 I-93 223°92 1 o'901 M on 3 n.
No. 2299 = X 2767 = S 780.
Discovered by SouTH and STRUVE. There is no evidence of change in either element.
1825-67 P = 3:67 D = 2.933 S on 3 m. with 5-in. refr.
1830'25 32-85 I'904 H on 2 n. with same.
I 83 o'4o 3O'57 2:463 X on 3 m.
1841-60 3o'60 2.686 DA on I n. with Mr. Bishop's 7-in, refr.
1842-81 33'22 2°531 M on 2 n.
1846'5o 27.86 tº º HI on I n. with Mr. Bishop's 7-in, refr.
1851.87 34°52 2.717 M on 2 n.
1854.78 3 I '79 2'35o M on 2 m.
No. 2303 = O > 431.
The measures made by the discoverer of this meat little double star are the only ones
I have to compare with my own. - -
I 845°o2 P = 11757 D = 3207 O > on 3 n. -
1851.21 1 17:23 3204 DA on 2 m. with 63-in. refr. and P.W.M.
1852-51 1 18-o'ſ 3.296 DA on 3 m. with same telescope on 2 n. and
Sph. Cr. M.; and 7%-in, refr. by Al. Clark on
I and Pr. Cr. M.
No. 2308 = X 2776 = H I. 46.
A triple star discovered by H. STRUVE concluded from the difference between HI’s
results and his own that some change must have taken place in the position of the wide
pair; but the close agreement of my angle with STRUVE's renders this doubtful.
A and B (the wide pair).
1782-69 P = słis D = 8370 H
1832° 56 51' 16 84-94o X on 5 n.
1841:64 5 I-73 85'o88 DA on 1 m. with Mr. Bishop's 7-in. refr.
Micrometrical Measurements of Double Stars. 435
B and C (the close pair).
1782-69 P = 332%; D = 4. H. “With 460, one diameter of L, or more.”
1833'o8 34O'90, 5'873 X on 6 n.
1841-64 337'90 5'951 DA on 1 m. with Mr. Bishop's 7-in. refr.
No. 2310 = O > 432 = P XXI. 50.
Through the courtesy of Mr. OTTO STRUVE, who detected the duplicity of this object,
I am enabled to bring his measures of it and my own into comparison.
1842-66 P = 1.36%0 D = 1°18o ox on 1 m.
1845-69 I 3 o'oo 1-1 50 O > on 1 m.
1851-71 127.60 1:23 o O X on 2 n.
1853-86 I 29'69 I'oZ3 DA on 2 n.
Some diminution of the angle seems probable.
No. 2312 = X 2786 = S 784 = B (Weisse) xxi. 271 = Equulei 27 (B).
A neat double star detected independently by BESSEL, SouTH, and STRUVE. Notwith-
standing a difference of above 6° among the following results, it may be doubted whether
any real change has taken place.
1825.74 P = 18; 12 D = #642
1828-64
1830-63
183 I'o.4
1837.82
1840: 57
1842-78
1846-54
1854.78
I 88°oo
183’5o
183.62
185'3
184'o'7
18476
181-81
184 16
3'o8
2-566
2'460
2'27
2'405
2.559
2°25 I
S on 2 m. with 5-in. refr. by Tulley.
H on 1 n. with same telescope (O. G. pinched in its cell).
H on 3 m. with same (O. G. released).
2 on 5 n.
2 on 1 m.
DA on 1 m. with Mr. Bishop's 7-in. refr.
M on 6 n.
HI on 2 m. with Mr. Bishop's 7-in. refr.
DA on I n, with 73-in. refr. by Al. Clark.
No. 2314 = O > 435.
An excessively close double star, detected by Mr. OTTO STRUVE, whose measures are the
only ones I know of ; having been communicated by letter for comparison with my own.
O > on 2 n.
D = oºzo -
o'55 est. DA on 4 m. with 63-in. refr.
O
P = 17-oo
zor'78
1845'88
1852'43
436 - Rev. W. R. DAWEs, Catalogue of
No. 2318 = O > 437.
Another of Mr. OTTO STRUVE's discoveries, besides whose observations I am acquainted
with none to compare with my own, except an imperfect set by MADLER.
1845°43 P = 6:7; D = *310 O X on 4 m.
1845-63 63-74 M on I m.
1851.98 61:28 I-292 DA on 4 m. with 63-in. refr.
No. 2322 = X 2799 = S 791 = Pegasi 20 (B).
A close and neat little double star detected both by SouTH and STRUVE. Though the
measures are rather difficult, and the individual results differ rather widely, yet there is
sufficient evidence of a retrograde orbital motion since the first observations.
1825.68 P = 333.08 D = *19 5 S on 2 m. with 5-in. refr. Distance rather uncertain.
1829:20 337'35 I'35o X on 2 n.
1830-64 334°58 I'o est. H on I n. with 5-in, refr. (Z + 180°).
1832-63 333’ I 5 I 352 > on 4 n.
1832-92 335-16 1:1 oo DA on 2 n. with 3-8 refr. -
184o 72 327°42 1.264 DA on 9 n. (D on 7) with Mr. Bishop's 7-in. refr.
1841.63 33 o'o6 I 583 M on 2 n.
1842.76. 328.87 I 345 M on 2 n.
1843.76 327.67 1.241 DAon 1 m. with Mr. Bishop's 7-in. refr. and Pr. Cr.M.
185o'75 3.24°45 I '700 M on I n.
1851.74 3.24°7o I'477 M on 3 n.
1851-96 322:63 1.262 DA on 3 m. with 63-in. refr. and P. W. M.
1853-8o 322°75 1:327 M on 3 m. (Z + 180°).
1853-89 32 I'74 1,400 DA on 1 m. with same telescope and Pr. Cr. M.
I 854-74 320-31 I-177 DA on 5 m. with 73-in. refr. by Al. Clark.
1854-79 323.70 I'365 M on 5 m. (Z + 180°).
No. 2341 = X 2804 = S 793 = Pegasi 29 (B).
Discovered both by SouTH and Struve. Though the results of the measures of position
do not run quite smoothly, yet there can be no doubt of the binary character of this object;
1825'70
1828-64
O
P = 31 1-67
3 I 3'27
as the following series will show.
D = #580 S on 3 n. (D on 2) with 5-in. refr.
2.71
H on I n, with same telescope.
Micrometrical Measurements of Double Stars. 437
1828.75
1830'66
1831-73
1832-87
1833°52
I835-44
1836-71
1841 '44
1842:76
1843°72
I 845°45
1846'54
1848.65
1851 or
1851.87
1853.76
I 854'45
1854-74
A fine
1780-85
1823-69
1823.87
1830-77
1831:63
1832.79
1839.62
1841-23
1841-60
1842-77
1843.79
1847-92
1850-83
1851-87
I 853-94
1854°29
- O
P = 3 14-40
3.18°o 5
316' Io
3 I4* I 7
318: 57
317°oo
3.1695
317.85
32 o'78
319-67
322'4O
323"O5
3 I 9°o3
320.76
32 I ‘7 I
321'o6
322.85
322:24
No. 2351
O
P = Io9'27
I I 3 'o'7
Io9' Io
1 12-67
I I4. 55
I 13.8
I I4'3
I I4'O4.
I I 5 'o';
I I4'92
I I4'99
I I 5" Io
1 16-oS
I I 5’28
II 5'32
1 16-63
D = #930
3:38
3'22.
3' I 25
2.88o
3-182
27.32
2.938
2.8o I
- 2'916
2-616
2'745
2.895
2770
2'914
2.898
2 813
X on 2 n.
H on I n.
H on I n. -
DA on I n. with 3-8-in. refr.
X on 3 n.
DA on 3 m. with same telescope.
2 on 4 m.
DA on 4 n. (D on 3) with Mr. Bishop's 7-in, refr.
and P. W. M.
M on 2 n.
DA on 1 m. with same telescope and Pr. Cr. M.
HI on I n. with same telescope and Pr. Cr. M.
HI on I n. with same telescope.
DA on I n. with 64-in. refr.
M on I n.
M on 2 n. -
DA on 3 m. with same telescope.
M on 3 n.
DA on I n. with 73-in. refr. by Al. Clark.
= 2. 2822 = H III. 15 = 0, Cygni.
M/
D = 6.927
5’744
5'5.5o
5:670
5'5.57
5-6
5*4.
5' 54. I
5' I oo
4'634
5°297
5'4. I4.
4:756
4’373
4'246
4'74.O
double star discovered by H in 1779. There is very slight evidence of change.
H -
H and S on 2 n.
> with the smaller instruments at Dorpat.
H on I n.
2 on 4 n.
SM
SM
DA on 4 n. (D on 3) with Mr. Bishop's 7-in. refr.
and P. W. M.
M on 4 n (D on 3).
M on 2 n.
DA on 2 n. with same telescope and Pr. Cr. M.
M on 1 n.
M on 5 n.
M on 2 n. (D on 1).
M on I n.
DE on 9 n, with 53-in. dialytic refr. by Plössl.
438 Rev. W. R. DAWEs, Catalogue of
No. 2357 = O > 451 = P XXI. 328.
Having lately received his measures from the discoverer of this neat double star, I am
enabled to insert them for comparison with my own.
I 847-51 P = 22:90 D = £320 O X on 3 n.
1853-98 222'83 4' 543 DA on I n.
No. 2358 = O > 454.
Of this double star, detected by Mr. OTTO STRUVE, I received from him some measures
for comparison with mine. MADLER has also observed the position on one night.
1846-77 P = 275%3 - D = 6'867 O > on 3 n. “Mag. 7'o and 9°o.”
1848-65 277-90 6'987 DA on I n.
1851.76 276-27 ... M on I n.
No. 2359 = O > 456.
A close double star discovered by Mr. OTTO STRUVE, who has lately sent me his measures
for comparison. 4. -
1845'71 P = 2; o; D = #32; O > on 2 n.
1851.76 27. Io 1-400 O > on 1 n.
1851.76 25'83 I 2 I I M on I n.
1853'98 28-89 I 145 DA on I n.
No. 2360 = X 2848 = H III. 74.
Detected by H. There is very little if any evidence of change.
1783.56 P = 58°48 D = 1483 H. Dist. “full measure.”
1823°77 56'52 1 o'og3 S on I n.
1829:41 54.87 I o'447 2 on 3 n.
1830.76 55°o8 I o'44 H on I n.
1841.38 56.18 1 o'631 DA on 3 n. with Mr Bishop's 7-in. refr.
1841 5o 55-96 Io 14.1 M on 2 n. (D on 1). -
1842.81 55'84 1 o' 558 M on 4 n.
1845-63 56'40 ... HI on 1 m. with Mr. Bishop's 7-in, refr.
1846'57 56'51 ... HI on I n with Same.
Micrometrical Measurements of Double Stars. 439
No. 2363 = X 2868.
A close double star detected by STRUVE. Probably unaltered ; the differences among the
results arising from the difficulty of the object.
1828-73 P = 650 D = “110 × on 2 n.
1833-77 2°4o I I 3o X on I m.
1842-74. 3'I 2 I-614 M on 1 m.
1844°oo o'70 I'o est. DA on 1 m. with Mr. Bishop's 7-in. refr.
No. 2364 = X 2878 = Pegasi 148 (B).
Another of STRUVE's discoveries, close and rather difficult. No material variation seems to
have occurred since the first measures. •
183 o'31 P = 1368o D = 1365 X on 4 n.
1831-62 123'58 1.44 H on I n. (Angle conjecturally altered from
33° 35's, preceding, to the same s, following.)
1842-73 I 35'23 1°338 M on 2 n. -
- I 85 o'99 I 34-85 1.332 M on I n.
1851'82 I 34°78 I'384 M on 3 n.
1854:28 126'. I 5 I'290 M on 2 n.
1854'77 I 33'55 1.323 DA on 1 m. with 73-in, refr. by Al. Clark.
No. 2365 = X 2900 = HIV. 99 = 33 Pegasi.
Discovered as a wide double star by HI in 1782 ; but STRUVE's Dorpat refractor brought
to light a small star within 3" of the brightest. That it should not have been seen by H with
his 7-foot Newtonian, nor by SouTH with his 5-foot refractor, is surprising ; as the close star,
though small, is by no means difficult to see with such instruments under moderately good
circumstances. The large star has been ascertained to have a considerable proper motion ;
in which its close companion seems to partake, as neither the angle nor the distance has
perceptibly altered. This, however, is not the case with the distant companion, whose
distance has diminished and position varied in a retrograde sense, evidently in consequence of
the proper motion of the large star. (See Introd. Pos. Med. p. ccxxxvi.)
A and C.
1783.62 P = cºo D = 45°oso H
1823'71 345°75 56'O45 S on 2 n.
I 829-93 343’95 56' 12O > on I m.
Rev. W. R. DAWEs, Catalogue of
1830'66 P = 343%. D = 56'61; DA on I n. with 3-8-in, refr.
1831°74 344."O 569 SM
1832-83 34.3°o7 56'59 2 on 4 n.
1834.96 34 I'98 56'89 X on I n.
1837.82 34. I'25 57:30 X on I n.
1838.88 34. I'o 56-6 SM
1839'69. 34o'8 579 SM
1840'I 5 34o'67 57.887 DA on 2 n. with Mr. Bishop's 7-in. refr. and
P. W. M.
A and B.
1830.75 P = 18:30 D = 342. DA on 5 n. (D on 2) with 3.8-in. refr.
1831°74 I 81.6 2:7 SM
1832.38 18o'73 2.468 X on 6 n.
1832-86 181-70 3°oq. I DA on 1 m. with same telescope.
1837.82 181-10 2°27'o 2 on I n.
1838.88 I8o'2 2'5 SM
1839'69 1789 2:7 SM
1840: 15 179' I I 2.829 DA on 2 n. with Mr. Bishop's 7-in. refr.
1842-78 I 79' 19 2°574 M on I n.
1851-58 179° 18 tº e DA on 1 m. with 63-in. refr. by Merz.
1852'26 181:32 2'503 M on 4 m. (D on 3).
1854.78 I 8o°8 I 2'404 DA on I m. with 7%-in, refr. by Al. Clark,
No. 2371 = 2 2909 = H II. 7 = % Aquarii.
This interesting and beautiful binary star was discovered by H in 1779, since which epoch
nearly 40° have been described in a retrograde sense, with a small diminution of distance ;
the extent of which, however, it is not easy accurately to estimate, because some of the earlier
measures were enormously too large, as was pointed out by STRUVE soon after he commenced
his labours with the great refractor at Dorpat. (See Memoirs Ast. Soc. vol. ii. p. 455.)
1781.37 P = 1839 D = 456 H. “With 460, 2 diameters.”
18ozºo I II '95 ... H -
182 I'99 358:20 3760 X, with the smaller instruments at Dorpat.
1822:27 360°52 4'989 H and S on 3 n.
1825'73 361 of 4°o 14 S on 5 n.
1825.73 359'8o 3'60o X on 2 n.
1828'56 356'22 5’219 H on 2 n.
183o'55 356'2O 3'952 DA on 3 m. with 3.8-in. refr.
1830'98 355'73 3.525 B on 8 m. with the Königsberg heliometer.
Micrometrical Measurements of Double Stars. 44. I
1831-64
1831.83
1832.71
1832-81
1832.87
1834' I 2
I 834.90
1836'o;
1837-38
1837-61
1838'04
1838-67
183977
184o'o I
1841'48
1841-82
1841 '86
I 842'59
1842-67
1842-76
1842.89
1843.72
1843'86
1844°oo
1846-48
1846'95
1847.86
I 847-93
1848°o;
1848'oz
1850-88
1851.72
1852:73
1852.8o
1852.81
1852'91
1852-94
1853'48
I 853-94
I 853-95
P = 3;6:19
356°o
355° 3
355-28
355’27
353-92
353'8
352*7 I
35 o'73
35 o'55
352'4
35 o'35
35 o'Og
353°68
352' I 7
349'97
348-44
348'9
348°oo
35 or 32
349” Io
3.48°og
35 o'88
348-22
347'79
347°53
348°7′o
346'83
346.42
347'7
348 Io
346-67
346'84.
345-76
346.9
347 O2
345 ‘72
345' 18
345-65
345' 18
D = 3'840
3-6
4°o
3'458
3-875
3'775
3.8
3'389
3'573
3'785
3'5
3.850
3'734
3'486
4' I 23
3'290
3:466
[2:7]
3’538
3°469
3.426
3’527
3'327
3.817
3'482
3° 274
3'383
3° 274
3'3
3'347
3'339
377 o
3'577
3'2
3'208
3’534
3'435
3 609
3'32O
H on 2 n.
SM
SM
2 on 5 n.
DA on 3 n. with 3.8-in, refr.
DA on 4 m. with the same.
SM
> on 8 n.
DA on 5 n. (D on 2) with 3.8-in. refr.
E
SM
G.
DA on 1 on. (D on 6) with Mr. Bishop's 7-in, refr,
K on 7 n. (D on 6).
M on 5 m. (D on 4).
R on 6 n. (D on 4).
DA on 4 m. (D on 2) with same telescope.
SM -
DA on I n. with same telescope.
M on 2 n.
DA on 2 n. with same telescope and Pr. Cr. M.
DA on 6 n. with same instruments.
K on 4 m.
DA on 2 m. with same telescope and P. W. M.
J on 2 n. with 3-8-in. refr. at Poona.
DA on 4 m. (D on 3) with 63-in. refr.
M on I n. -,
DA on 1 m. with same telescope and Sph. Cr. M.
DA on 1 m. with same telescope and P. W. M.
SM -
F on 4 m. with 4-in. refr. by Cooke.
MI with similar telescope. P and D by 32
obs. of each.
J on 2 m. with 6'3-in. refr. by Lerebours,
at Madras.
M on 6 n. (D on 1).
SM
F on 2 n. with 44-in. refr.
M1 with similar refr. P by 16 obs. ; D by 32.
DA on 8 m. with 64-in, reſt.
M on 3 m.
DA on I n, with same telescope and Sph. Cr. M.
Roy AL ASTRON. Soc. Vol. XXXV. * 3 L
442
Rev. W. R. DAWEs, Catalogue of
A close and difficult double star discovered by STRUVE.
1854-84.
1854.86
1854.88
1854'99
O
P = 343'27
344-96
344'89
343.96
3°774.
3745
3°334
D = 3% is DA on I n. with 73-in. refr. by Al. Clark, and
Sph. Cr. M. -
M on 2 n.
DE on 6 n. with 53-in. dialytic refr. by Plössl.
DA on 1 m. with 73-in. refr. and P. W. M.
No. 2414 = 2, 2912 = 37 Pegasi.
Though he concluded, from the
small difference in his own results in ten years, that no alteration was taking place, yet further
observations make it probable that the angle is very slowly increasing, while the distance may
possibly be diminishing. But the discrepancies are greater than usually occur in cases of equal
difficulty.
1831 12
1835-67
1835.81
1839.66
I 84 I of
1841-64
1842.8o
1843'87
1851'85
1853-88
1854'36
I 854'54
1830.67
1832.96
1841'5o
1841-8o
1843.81
P = 11263
1 I 5-60
II 6-8
. I 18.9
I I 8: I 6
I oë' 20
I 2 I 'o6
II 6' 16
126'27
I 18.72
I 18'51
I 18'53
P = 7:22
71°23
7 1-88
70-68
72' 12
f/
D = 1° 16o
I I 5o
I'3
I ' I
I "22 I
o:65o
o'85o
I " I OO
o:674.
I II 5
o'807
O'909
//
4-690
4.677
4. 7 I 4
4'829
2 on 3 m.
2 on 2 n.
SM
SM
DA on 3 m. (D on I, Ep. 1839'69) with Mr.
Bishop's 7-in. refr.
M on 2 n.
M on 3 n. -
DA on 2 m. with Mr. Bishop's 7-in. refr. and
Pr. Cr. M.
M on 2 n.
DA on 1 n. with 63-in. refr.
M on 2 n.
DA on 3 m. with 7%-in, refr, by Al. Clark.
No. 2423 = X 2917.
Detected by STRUVE. There is no ground for suspecting any change.
H on 2 n.
2 on 3 m.
M on 3 m. -
DA on 1 m. with Mr. Bishop's 7-in, refr. and P.W. M.
DA on I n. with same telescope and Pr. Cr. M.
Micrometrical Measurements of Double Stars. 443
No. 2425 = X 2922 = H IV. 86 = 8 Lacertae.
A wide quadruple star, discovered as such by H.; who, however, gives the position and
distance of the two closest and brightest only. It is very doubtful whether any change has
taken place among the four.
1782.76 P = 18;so D = 17,233 H. -
1823-74 184’35 22-674 H and S on 2 n. Not recognised as disco-
wered by H.
1831-61 185'68 22:467 X on 3 m.
I 834°59 185'5 22°5 SM
1839:76 185-62 º º DA on I n. with Mr. Bishop's 7-in, refr.
No. 2427 = O > = 476.
Of this close double star, detected by Mr. OTTO STRUVF, I have been favoured with
his measures for comparison with my own as follows:– .
1845°33 P = 336°os D = o'szo O X on 2 n.
1851-73 332'90 o'47o O > on I n. -
1853-90 33 I-69 o:616 DA on 2 m. with 63-in. refr.
No. 2429 = O > 478.
A neat double star discovered by Mr. OTTO STRUVE, who communicated to me, for
comparison with my own, some of his measurements. MADLER has also measured the star on
four nights; but the distance he assigns must have been attributed to this object by mistake,
and seems rather to belong to O > 461, in which star the angle differs more than 20° from
the position of O > 478. It is, however, very singular that the same error should have
been made at two different epochs, seven years apart |
1845-76 P = 280°66 D = [16601) M on 2 n.
1846.75 275-37 2-843 O 2 on 3 m.
I 85 I'49 28o 13 2.936 DA on 3 m. with 63-in. refr.
1852'79 277.86 [10-747] M on 2 n.
444 sº Rev. W. R. DAWES, Catalogue of
No. 2432 = O > 483 = 52 Pegasi.
A very close and elegant double star detected by Mr. OTTO STRUVE, who lately sent me
his measures of it, the mean of which is inserted in the following series. My own, from
unfavourable circumstances, were very poor. The discrepancies appear large for mere error of
observation.
I 845-70 P =. 18633 D = cºs; M on 3 m.
1847.86 tº tº o'905 DA on 1 n. with 63-in. refr. and Sph. Cr. M.
A, white; B, purplish 3
1852'60 186'99 1'oz7 O > on 7 n.
1853-88 190’90 I ‘23O DA on 1 m. with same telescope, and P. W. M.
1857.85 2O3'44. o'959 SE on 1 n.
No. 2434 = 2 2968 = Pegasi 273 (B).
Discovered by STRUVE. There seems no ground for suspecting any change since the first
measures were made.
1828-64 P = 9:23 D = [2°oz] H on 1 n.
1832-32 90'45 3'35o 2 on 4 n.
1839.79 9o'53 3'566 DA on I n. with Mr. Bishop's 7-in. refr.
1848'oz 92°48 3' I of M on 2 n.
No. 2435 = O > 494.
Some measures communicated to me by the discoverer of this pretty double star, are the
only ones with which I can compare my own.
1846-48 P = 8:30 D = #307 O X on 3 n.
1850°og 82 “I 2 3'273 DA on 3 m. with 63-in. refr.
No. 2438 = 2 3006.
Detected by SouTH. Though the discordancies among the results are considerable for a
star whose distance is about 5", yet there seems to be no evidence of any real change.
Micrometrical Measurements of Double Stars. 445
1825'70 P = 183.78 D = 5* 17 S on 2 n. with 5-in, refr. Considered “excessively
difficult.”
1829-67 18292 ... H on I n. with same refr. “Dist. 3 5". Very
- difficult.”
1830.75 17625 5'o; H on 1 m. with same refr. “Very difficult.”
1830-81 178'30 5'476 DA on I n. with 3.8-in. refr. Dist. by 2 obs.
- “Interrupted.” *
183 I 55 18277 4-650 X on 3 n.
1841 "3o 17694 4.935 DA on 3 m. (D on 1) with Mr. Bishop's 7-in, refr.
1843.78 176.98 5' 223 DA on 1 m. with same telescope, and Pr. Cr. M.
No. 2443 = 2 3017 = Cephei 287 (B).
Discovered by STRUVE. If the measures of distance may be trusted, that element has
somewhat diminished since the first measures, while the position has remained unaltered.
1830.75 P = 34.67 D = 2% H on 2 m. with 5-in. refr.
1832° 16 35-36 2'428 2 on 5 n.
1840'69 34'70 2.290 DA on 1 m. with Mr. Bishop's 7-in, refr.
1844'44 35' 35 2, 193 M
No. 2444 = O > 496 = D 2 = P XXIII. 100.
The very small and close companion of P xxiii. 1 oo was discovered by me in Oct. 1841,
and also by the STRUVEs with the 15-inch refractor at Pulkowa in the following year. The
late deeply lamented Admiral SMYTH, having requested me to examine for him this star, near
which (at a distance of about 2.0") he had been observing a very faint speck of light in the
n. p. quadrant (constituting h 1886, mag. 7 and 13, P = 340°5, D = 18"), I turned upon it
the 7-inch refractor in Mr. BISHOP's observatory, where I was then engaged as the observer ;
and immediately perceived a small close star which SMYTH had not seen when he most care-
fully scrutinised the object some years before. He therefore concluded that it must have
“come out” in the interval. This star is not identical with > 3ozz, with which it has been
confounded, but which is 9 further to the south ; and STRUVE's results are not at all like
those belonging to this object ; since of > 3022, P = 226°72; and D = 20°495. It is
singular that the close star was not brought to light by the 20-foot reflector of Sir John
HERSCHEL, in whose Fourth Series of Observations it stands as No. 1886; the small
companion there recorded, being the same as SMYTEI's C in his 839th object in the Cycle.
But X 3022 is identical with the object immediately following No. 1888 in the Fourth Series
above referred to. The only results besides my own that I am acquainted with, are those of
Mr. OTTO STRUVE, which he communicated to me for comparison.
446 4. Rev. W. R. DAWEs, Catalogue of
1841-82 P = 22.2%8 D = #459 DA on 3 n. (D on 2) with Mr. Bishop's 7-in. refr.
1847' 5o 22O'93 1.393 O > on 3 m.
1847'91 225'oo 1-627 DA on 2 n. with 63-in, refr.
This star is Groombridge 4077.
No. 2449 = O > 503.
A very neat double star discovered by Mr. OTTO STRUVE, whose results compared with
mine, indicate no change in any respect.
1845.87 P = 129°io D = 1783 O X on 3 n.
1853' I I I 3 o'oZ 1:643 DA on 5 n, with 63-in. refr. by Merz, and 7%-in.
refr. by Alvan Clark.
No. 24.54 = O > 508 = 6 Cassiopea.
A beautiful object of which the small companion was detected by Mr. OTTO STRUVE. His
measures are all I have for comparison.
1846.36 P = 19:00 D = #660 O > on 2 n.
1848.87 - 194'68 1.637 DA on 1 m. with 63-in. refr.
No. 2455 = O > 509. .
By the courtesy of the discoverer of this delicate double star, I have been lately put into
possession of his measures of it for comparison with my own. The difference of angle is such
as strongly to suggest some change in a star whose distance is 5%".
1848. I I P = 19883 D = 5%97 O X on 3 n.
1851.75 IO4'79 © tº M on 2 n.
1853'99 I O4'98 5'503 DA on I n, with 63-in. refr.
No. 2456 = X 3048 = S 836 = P XXIII. 240.
Discovered both by SouTH and STRUVE.
- The results do not decisively indicate any
real change.
Micrometrical Measurements of Double Stars. 447
1825.70 P = 3.14%3 D = 9%6. S on 2 n. “Excessively difficult.”
1828-92 3 I 3 '92 tº º H on I n.
1830: 57 3 I4'33 9°223 X on 3 n.
1830.76 3 I 3 '75 97.57 DA on 2 m, with 3.8-in. refr.
1833.88 3 I 3 '9 9°4 SM
1841-85 3 I 3 '42 9. 135 DA on I n. with Mr. Bishop's 7-in, refr.
No. 2457 = O > 513.
Of this object, detected by Mr. OTTO STRUVE, he has kindly communicated to me his
observations for comparison with mine. I am unacquainted with any others.
1846-16 P = 23:17 D = 3%;7 O X on 3 n.
1853'79 2 I 55 3:604 DA on 1 n.
1865'91 2 o'4o 3'84o O > on 1 m.
No. 2458 = 2 3049 = H I. 5 = a Cassiopea.
A beautiful double star discovered by H in 1780, from whose measures it was supposed
to have varied considerably in the interval of 223 years. Subsequent observations have,
however, proved that the difference of the results arose from conspiring errors, and that
in fact no change has occurred, as the following series will testify.
1781.97 P = 33647 D = " H “With 460, 1} diameter of L.”
1804'44 3 I 9°23 ... H : -
1823.8 3.27.68 2'924 S on 2 m. “Large, 6, white ; small, ſo, blue.”
1830-60 3.24°oo 292 I DA on 2 n. (D on 3) with 3.8-in. refr.
1831-61 3.25°2 2-9 SM “A, 6, flushed white; B, 8, smalt blue.”
1831.8o 326°oo 3'87 H on 1 m. with 5-in. refr.
1833. 19 323'47 3°o 12 2 on 4 m. “Major = 5:4, viridis ; minor = 7-5,
- egregie coºrulea. Colores insignes.”
1834'06 3.24°o 5 3’ 186 DA on 1 m. with 3.8-in. ref. A, white; B, blue.
1834.88 323'9 3' I SM
1838'96 323°7 3°o SM
1841-86 3.24°7o 3' I 13 DA on 1 m. with Mr. Bishop's 7-in, refr.
I 842'44 326'o6 2’60 M on 1 m.
1848'71 326’4 2'9 SM
1848.75 3.25°34 3' 198 M on 3 m.
1848.87 324'45 3'o 17 DA on 1 m. with 63-in. refr.
1852.65 323.88 2792 M on 2 n.
1854,77 324'95 2'993 DE on 3 m. with 53-in. dialytic refr.
448
Rev. W. R. DAWEs, Catalogue of
No. 2460
ſº
> 3050 = H. N. 58 = Androm. 37 (B).
A pretty and very easy object detected by H. There seems to be some probability of
a small direct motion in position, with a slight diminution of the distance, in which element,
however, the results are remarkably discordant. -
1821 '92
1830-73
1832-65
1843.81
1850'85
1851.88
1854'68
1854-81
O
P = 188:37
189'o;
191 ‘O3
192'98
196°o A.
196.25
196'51
195-96
Discovered by STRUVE.
are great, considering the distance of the components. It should be noticed that the position
is very oblique, and may therefore require special precautions.
1829.72
1829.76
1830°36
1831 75
1832-92
1833.86
1837.76
1839'87
184o'79
1841-64
1842-88
1842-95
I 843'90
1845’72
1850-86
O
P = 142 Io
I 48:37
148:62
146-27
I 45'58
146.32
145-65
146'09
I 45' 55
I 45'95
1478.1
146-22
I45'68
146'70
//
D = 5.263
4."O72
3.783
3-65 I
S 3.866
3.760
3:665
3°472
//
D = 9.62
7' 590
8’44
7: 12
7'95o
7'723
7'794
7' 583
7-601
7-690
7'436
7'733
8'ojo
7' 573
H and S on 2 n.
DA on 2 n. (D on 4) with 3-8-in. refr.
> on 3 n.
DA on I n, with Mr. Bishop's 7-in. refr. and
Pr. Cr. M.
M on 2 n.
M on 2 n.
DE on 5 m. with 53-in. dialytic refr.
DA on 1 n, with 74-in, refr. by Al. Clark.
No. 2462 = 2 3061.
The angle may perhaps be diminishing; but the discordances
H on 1 m. with 5-in. refr.
> On 4 n.
H on I n, with same telescope.
H on I m. with same.
DA on I n. with 3' 8-in. refr.
DA on 2 n. (D on 3) with same.
DA on 4 m. with same telescope.
DA on 4 n. (D on 3) with Mr. Bishop's 7-in, refr.
and P. W. M.
DA on 2 m. with same instruments.
DA on I m. with same.
M on 3 n,
DA on I n. with Mr. Bishop's 7-in. refr, and
Pr. CT. M.
DA on 2 m. with same instruments.
HI on I n. with same telescope, and Divided eye-
glass D. I. M.
DA on 3 m. with 63-in. refr, by Merz.
Micrometrical Measurements of Double Stars. 449
No. 2475 = x 3062 = H I. 39.
A close and very interesting binary system, discovered by H in 1782, since which time it
has performed considerably more than three fourths of a revolution ; its closest approximation,
which took place about 1835, having been o'4+.
1782-65 P = 320.70 D = " H. “With 460, #, or when best #, diameter of S.”
1823.81 36'70 125-E X with the Smaller instruments at Dorpat.
1831-71 87.50 o'82 o X on 2 m. with 9.6-in. refr. by Fraunhofer.
1833-71 Io9'57 o'557 X on 3 m. -
1835-66 I 32-62 o'4Io 2 on 5 n.
1836-61 146' 38 o'466 2 on 5 m.
1837-78 I 57'90 o°490 2 on 3 n. -
184o'78 186.96 o:8 est. DA on 3 n. (D on 2) with Mr. Bishop's 7-in, refr.
1841'58 193°58 o'887 M on 7 n.
1841-86 I93°43 o'954. DA on 2 n. with same telescope.
1842.8o 207:27 o'866 M on 1 m. *
1843'8o 2 I O'OO o’937 DA on 1 n. with same telescope, and Pr. Cr. M.
I 847-53 225 Io I ‘I 25 M on 5 m.
1848.87 228.85 I I 59 DA on 1 m. with 63-in. refr. by Merz.
1850-71 232°29 I'277 M on 3 n.
185 o'93 235'24. ... DA on 1 m. with same.
1851-18 236.96 I’ I 59 M on 8 m.
1851.76 234.62 I-269 M on 2 n.
1852'21 24. I'3O I'ozo M on 2 n.
1852.72 238°o; I '248 M on Io n.
I854'32 244'3O I 285. DA on 3 m. with 63-in, refr, by Merz, and 73-in.
ROYAL ASTRON. SOC. VoI. XXXV.
refr. by Al. Clark.
3 M
A PPE N DIX.
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Micrometrical Measurements of Double Stars.
453
o, *
.# $3
N à # Epoch N
O. # É 18oo + -> Otes,
s: >
º o & At Hopefield, with Al, Clark's 84-in. equatoreal refractor. Mags. gauged.
2486 7.5, 8:o P. w. 59°757 Decidedly elongated. Discov. by A. C. Oct. 1856. This star is L 372.
2487 6, 6% tºmº 59'890 With A.C.'s 8-in. refractor. Beautifully seen and obs, very good.
I y y g
2488 tº e -** ’877 Obs, very good.
A, white ; B, bluish. Mags. gauged. A distant star II+ mag. in the lime of B and A
2489 7'7, 9 º-º 59-656 produced, being 320°-E. Obs, very good. Discovered by me 1858, Nov. II. A
most splendid aurora.
2490 8, Io -- ‘757 A, pale yellow ; B, pale blue, or ash-colour. Obs, excellent.
e A, pale yellow ; B, pale blue. Obs, very good. The ink is freezing in
249 I | 8, Io -º- 809 'àe pen Therm. 22°F. Oct. 23. *
- 1. *º e tº Very difficult. Obs. tolerable. Observed at Wateringbury with Merz's
2492 || 4%, Io; 54."O75 6-in. refractor.
2493 Iok, Io; -sº ‘O75 | Diffused and unsteady. Excessively difficult. Ohs. very indifferent.
- e * e With A. C.’s 8+-in. equatoreal refractor. Obs. very good. Discovered
2494 | 8°o, 9°o 59.757 by Alvan Clark 1858, Oct. 13.
2495 || 8, 9 -sº '869 | Very meat star; not very difficult. Both white.
With A. C.’s 8+-in. refractor. Obs, moderately good. Elongation notched when
2496 7.3, 7'3 -* 59'809 best seen. X says, “Single in 1851.” Angle as set down, diminished by 180°; the
- stars being equal. -
2 tº º * 63-8 Same telescope. Scarcely elongated; probably a rapid binary.
9 | § p p y
1 *= e With A. C.’s 8+-in. refractor. Beautifully defined, and usually very
2498 || 23, 5, 6 63-863 steady. Obs, excellent. y -
24.99 6, 7 --> 59.809 | B, very pale yellow; C, blue. With A.C.'s 8-in, equatoreal refractor.
* t The stars cleanly divided, with scarcely any light about them. B, greenish
25oo 5, 6 63-863 yellow ; C, bluish green. With same telescope. J
2 Q O I # # -*. 65.682 | With T. Cooke and Sons' 8-in. equatoreal refractor. Very well seen
5 4:3, 5; 5 and pretty steady. P. excellent; D. good.
25O2 © º D. I. 60'oZ8 || With A.C.'s 8-in. refractor and Amici's D.I.M.
25 O3 5, 9 P. W. 59' 149 || At Hopefield, with A.C.'s 7-in, refractor on Munich mounting.
-* e Duplicity lately discovered by Mr. G. Knott. Obs. with A. C.’s 8%-in.
25 O4. 5, IO 63-85.5 equatoreal refractor.
25 O5 5, Io smºs ‘863 || A, pale yellow ; B, bluish. Obs, pretty good.
2506 || 7%, 7% --> 59'149 |Obs, at Haddenham with A.C.'s 73-in, refractor.
g With Cooke's 8-im. equatoreal refractor. The pos. of the xk to the
2507 |9(neb.:K)7; ºmºe 65'3 Io north measured from the nebula.
e At Haddenham, with A. C.’s 8-in, refractor, and Amici's D.I.M. First
2508 e - D. I 57. I 54. measures at Hopsfield.
25 og *=º ‘35 I Same tel. and microm. By daylight. A double circular aperture on
O. G.; each 4 inches in diam.
25 Io * '365 Same instrument. An elliptic ap. on O. G. 8 in. by 4. Disks very good.
Same instrument. Double circular aperture, each 4 in. in diameter. For pos. one
25 II tº -** • 37 I of the same measured with the double webs. With the images in a line,
P = 2449-49; obs, Io; wt. 27. Obs. poor.
25 I 2 * 6o: o'ſ 8 wº 5.º sº refractor, and Amici's D.I.M. Double circular (or
25 I 3 P. W. .264 || Same tel, and P.W.M. Stars placed vertically by prism.
25 I4. &= --> 264 | Same night and instrument. Stars placed horizontally by prism,
& Same tel, and 4-glass D.I.M. by Simms. 3 pos. taken vertically, and 3
25 I 5 D. I. 267 horizontally by prism. Obs. pretty good.
25 16 P. W. 63.25o Same tel. and P.W.M. Obs. remarkably good.
ſo on 3070700 “STAVCI I'M Aoû +S-7


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Micrometrical Measurements of Double Stars.
4-55

# # Epoch
No. § É 18oo + Notes.
> >
25 I7 P. W. 63'253 | Same instruments. Obs. pretty good.
25 18 * > * D. I. 64.294 || With 4-glass D. I. M. Obs. good.
25 IQ fººt '302 || With Amici’s D. I. M. Stars fidgety. Obs. pretty good.
252O P. W. 305 || Stars very fidgety. P. pretty good; D. indifferent. .
252 I D. I. 308 || With Spherico-prismatic crystal micrometer by Dollond.
2522 P. W. 65.29 With 8-in. equatoreal refractor by Cooke and Sons. Obs. very good.
e 5'299 BARLow-lens on microm.
2523 tº wº D. I. ‘3O2 Same telescope, and Amici’s D. I. M. and BARLow-lens.
2524 ſº '305 || Same instruments without the BARLow-lens.
2525 P. W. 313 | Same tel, and P. W. M. with BARLow-lens. Obs, very good, Daylight.
2526 e Q * 60°264 At Hopefield, with A. C.’s 83-in. equatoreal. Obs, very good.
2527 tºmºmº 63.25o Usually very steady and neatly separated. Obs, excellent.
2528 tºmº 64:28o P. good; D. middling.
2529 e gºmº 305 Obs, moderately good.
2 Q 2 O tº-e 65.28o April 13. The first obs. with T. Cooke and Sons' 8-in, equatoreal refr.
53 e 5 At times well seen, and neatly divided. Obs. pretty good.
253 I wºmmº ‘299 || BARLow-lens on microm. P. very poor; D. middling.
2.532 * 348 Obs. pretty good, but the stars are too unsteady for good distances.
† At Hopefield; with A.C.'s 8+-in. equatoreal. A., yellow; B, lilac. An
2533 || 6%, 8% sº 6o:250 elegant miniature of s Boötis. Clouded. y j
1. tºmsºmºsº iè Both stars very white. Measured both vertically and horizontally.
2534. 7}, 73 6o:250 Obs. very good.
Q Both white. Probably bi . See the obs, in 1854. Obs. with A.C.’s 8+-in.
25.35 53, 5% ºmº 6o 34. I ºil. robably pinary ee the obs, in IS54 S, WIUI'l s 8+-in
2536 tº º * 59-365 At Hopefield, with A.C.'s 7-in. O. G. Obs. pretty good.
2537 tº — 371 | Same telescope. Obs. moderately good. *
2.538 tºº 60'341 With A. C.’s 8+-in, equatoreal. Perforated whole aperture (small holes),
Beautiful image.
2.539 g D. I. ‘354 Same telescope; and 4-glass D. I. M. by Simms. Obs, good.
2540 P. W. *37 I | BARLow-lens on micrometer. Obs. indifferent.
254. I ſºmº '387 Obs, very good, with same arrangement.
2542 cº º D. I. 393 || With 4-glass D. I. M. Obs, very good.
2543 º P. W. 64,497 P. very good; D. indifferent.
* * . With the 8-in, equatoreal refractor by Cooke and Sons. Amici's D. I. M.
2544. tº D. I. 65'305 and fig. of 8 aperture. Pretty good. b
1. tº BARLow-lens on microm. A beautiful image. Obs. admirably perfect.
2545 2, 3; P. W. 395 A, pale yellow or golden; B, greenish pale yellow or greenish lemon.
2546 e D. I. '398 || Bright sunshine. Amici's D. I. M. with BARLow-lens.
g At Hopefield, with A.C.'s 83-in. Equatoreal. Obs. pretty good. Angle
2547 | 73, 8 P. W. 60'341 diminished since X's observations.
Jo on 3070700 “STAVCI I'M Aoq 994,


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tº e o?9 || 9 || 1 || 8o. So I * oS Sz
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98% zy 9 o882 98% $9. |s £1.5ol 89.45 3.21." £z$ 1 |"Ioſeſ assuſ, 3 ||3752
9 92 "S
# ; ; ; ; - à # 'uogsod | 'o681 •oS 31 23; 'uoſº bušjs9CI ‘ON |
# | # | g | # | 3 | # # ‘q:d'N | vºl. Fää -
| # 9 | # - $º
Micrometrical Measurements of Double Stars.
457
§ §
rd <!->
# # Epoch
No. § g 18oo + Notes.
cº .9
s >
2548 ū P. W. 60'313 | With A. C.’s 83-in. equatoreal. Stars placed horizontally.
2549 © * "3 I 3 || Stars placed vertically, for comparison with the preceding set.
25.5o g tºmºmº • 37 i Suddenly clouded. This measure good.
Obs, pretty good. The last measures with Alvan Clark's 83-in. equa-
255 I tº tº tºmmy 64'497 toreal, June 3o. - -
, sº * With A. C.’s 8+-in. equatoreal, and B, -l icrom. A, yellow; B, blue ;
25 52 sº 6o. 286 but not ...; ... .."tºv sº 20 Č6.
25 53 & *sº • 286 Same night. Stars placed vertically by prism, for comparison with the
* preceding set. The vertical are preferred.
2. 8 — 6c With Cooke's 8-in. equatoreal. BARLow lens on microm. A, yellowish;
554 || 4, 5' 395 B, pale purple. j
2555 º e D. I. 55’228 With A.C.'s 73-in. O. G. and Amici's D. I. M. Angles measured on the
single image, which is nearly perfect.
25 56 * * * «Pºs ‘244 | Same instruments. Single image measured for pos. and is very perfect.
25.57 tº ſº &ºm=º "244. Same night, and instruments. Single image measured with parallel
webs at right angles to the direction of the separation.
2558 tº P. W. ‘390 | Clouded immediately after this measure, which was satisfactory.
2.559 • C = - '395 || Obs. satisfactory.
2560 tº º D. I '424 With Amici's D. I. M. Very unsteady. Clouded.
2561 © º º- '438 || Same D. I. M. Obs. very good.
2562 ſº º P. W. '477 | Well seen, and pretty steady.
2 c6 * = r ' [.. I 2 With an O.G. of 73-in. aperture by A.C. Usually very well seen. Sun.
2503 - 5** | shine.
6 tºmº g With A. C.’s 8-in, refractor. Stars so unsteady and flashy that the aper-
2504. 57.288 ture was reduced to 5% inches.
256 5 * sºmºmºmº 294 | Very flashy and fidgety in general. Aperture reduced to 5% inches.
e Both light yellow. Night apparently splendid, but not favourable.
2566 || 3}, 3} | D. I 297 || “... pº gnt apparently sp 5
| 2 567 * .338 || Amici's D. I. M. Neither steady nor well defined.
25 68 ſº 349 | Same micrometer, and perforated 73-in. aperture.
2 569 tº tºmº ‘35 I Same micrometer, and double circular aperture, each = 4 inches. Obs.
good.
257 o *mº "365 | Same microm. Elliptic aperture 8 × 4 inches.
257 I • * * 37 I | Same microm. Double 4-inch aperture. One image measured with
parallel webs for pos.
2 572 — '373 || Same microm. Double 4-in. circular aperture.
2573 P. W. ‘4o I | Occasional steady and fine views. Obs. excellent.
Rxcessively fidgety in general with better intervals. The northern star
* A , . y Tidgety
2574 tºº 445 thought rather the smaller.
2575 * º '472 | Remarkably well seen in general. Obs. nearly perfect. Sunshine.
6 g Brilliant sunshine. Usually very fidgety, but often admirably defined.
257 tºms 477 P. excellent; D. very good.
2577 © tº imsºmº, 58.412 || With A.C.'s 7-in, refractor. Daylight. Obs, good.
2578 e * '4. I 5 || Daylight. Clouded. P. very good; D. fair.
Roy AL ASTRON. SOC. Wol. XXXV.
3 N
ſo on 5070700 “STAVCI I'M Aoºſ 85%



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Micrometrical Measurements of Double Stars.
459

wº *
3 §
E # Epoch
No. § É 18oo + Notes.
> >. --
2579 e P. W. 58.442 || Wind easterly; the stars mould greatly. P. good; D. tolerable.
25.8o tº ºf '445 Obs. pretty good.
2581 tº gºmº. '461 | P. very good; D. fair.
8 tº Sun-shining brightly. The star has become excessively tremulous, and |
2582 tºº 472 || no more distances can be procured. . -
2.583 '48o *. but often well seen. Southern star the smaller. Obs.
assºmsº excellent. -
2584 tº- '49 I. sº º seen at times and unsteady, but less so during measures
OI (IISUa Il Ce,
2585 ºmº 59-365 with A. C.'s 7-in, refr. Daylight. Obs. pretty good.
2586 *sº '48o wº A. C.’s 8+ in. equatoreal refractor, Mr. Clark being present in the
servatory. -
2587 tº G See Note: "48o | Same day. Measured with A. C.’s double-eye-piece micrometer.
2.588 Qe P. W. 483 | obs, very good.
2589 • tºmº ‘507 | P. very good; D. excellent.
2590 3, D. I. 6o'393 wº 4. D. I. M. A double 4-in, aperture diaphragm on O. G.
bS. good. -
259 I e e . '407 || With Amici's D. I. M. Obs. very poor.
2592 ſº P. W. 62:450 | Pos. observed between the double thick webs.
2593 tº e. tº- ‘45o Same day. º * the thick position wires, which are rather
far apart. Obs. good.
2594 *º 63.25o | Same instruments. Obs. excellent.
2595 ºmºmº 64'422 Obs, poor.
2596 * ‘43 I Obs. nearly perfect.
2597 e *ºf ‘434 Daylight. Obs, excellent.
2598 © e *Eº '45o P. pretty good; D. excellent. -
2599 tºº 65.348 wº 8-in, equatoreal. BARLow-lens on micrometer. Obs.
26oo sºme '381 | Same telescope and micrometer. Obs, poor.
26o I * '384 || Obs, good.
26oz e D. I. '387 with Amici's D. I. M. P. excellent. D. very good.
26o 3 te P. W. '395 || BARLow-lens on micrometer. Obs. very good.
26o 4. tº º Rºssº '444 Sunshine. Beautiful definition. The northern star judged to be rather
the smaller. -
2605 gº tº assº '458 P. good; D. middling.
26of º '48o Sun shining brightly. P. very good; D. pretty good.
2607 D. I. 60.354 with A. C.’s 8+ in, equatoreal, and the 4-glass D. I. M. by Simms.
| 26ob P. W. $7,453 || At Hopefield. With A.C.'s 8-in. O. G. Air unfavourable.
26og *mºn 66.341 With A.C.'s 8-in, equatoreal Obs, good.
46o Rev. W. R. DAWEs, Catalogue of

# - # +5 d5 # +5
R. A. | N.P.D. # | # | # à | # | # | #
No, Designation. # # # 185o. 185o. | Position. | # # # # # # #
& c : # B# ſ>- #S # B- ſa-ſ
l—! CD C)
lh m 8 O / O // -
26 Io | 42 Comae | 1728 | 13 2 41 | 71 4I | 183'55 | I 2 | 486 | o'2 est. .. | I | 486
26 I I I9I°o2 | 5 | 44 | 486 | oº 5o est. .. | 2 | 486
2612 $ # © © © e 193'4I | 5 | 34 | 486 | o'45 est. 3 | 486
2613 |# #} 1757 | 3 26 38 89 33 | 5431 | 5 | 29 | 486 | 2 315 | 4 | 21 | 486
26I4 . . s ， º 6s 53'38 | 5 | 24 | 472 | 2ºo8o | 4 | I4 | 472
26 I 5 #† } 1768 | 13 3o 47| 52 56 | Io or 15 est.| I | 97o | o I 5 est. .. | I | 97o
26 I 6 © © © © © s Round | . . 558 © © © º
2617 | 84 Virginis | 1777 |13 35 32| 85 42 | 233-63 | 6 | 33 | 466 | 3'6oo | 1o | 47 | 466
2618 e Boötis 1877 |14 38 26| 62 17 | 323 63 | 7 | 42 | 4oo | 2 638 | 4 | 23 | 4oo
2619 324'42 | 5 | 38 | 486 | 2 76o | 4 | 29 | 486
262o 324'35 | 5 | 41 | 486 | 2 894 | 6 | 44 | 486
262 I 324'55 | 3 | 22 | 63o | 2'8o3 | 4 | 22 | 63o
2622 32 5'75 | 5 | 32 | 558 | 2'94o | 4 | I2 | 558
2623 32 5'43 | 5 | 38 | 558 | 2'9o8 | 4 | 22 | 558
2624 © ſº © © f2 ， 0 0 32 5'36 | 5 | 4o | 558 | 2'91 5 | 6 | 48 | 558
262 5 # Boötis 1888 | 14 44 28| 7o 16 | 3o9'98 | Io | 78 | 312 | 5'9o3 | I o | 78 | 3 I2
2626 | B.A.C. 4923 14 49 17|I I o 42 | 285"o7 7 | 94
2627 | m Coronae | 1937 1 5 17 o 59 I o | 322'46 44 | 5 I 2 | O'45 est. .. | 3 | 5 I 2
2628 34I"71 | 12 | 35 | 526 | o 45 est. .. | 3 | 526
2629 35oº89 | 7 | 41 | 526 | o'6oest. .. | 3 | 526
263o 35oº77 | I o | 76 # o°6oo | I o | 35 #
263 I Véº 4 53 | 5 | 28 | 486 | o'787 I 4 | 486
2632 5 68 | 7 | 4o | 651 | o 685 12 | 651
2633 6ºo7 | 5 | 36 | 486 | o 7o9 | Io | 4o | 486
2634 9"o5 | I 3 | 486 | o'84o | 4 | I 4 | 486
2635 8'39 | 5 | 39 | 472 | o'885 | 4 | 19 | 472
2636 26'85 | 5 | 23 | 558 | I'o59 | 6 | 14 | 558
2637 • 27º89 | 3 | 22 | 426 | I* I4o | 6 | 24 | 426
2638 S .... # © (© © L, 27"7o | 5 | 4o | 558 | o'994 | 4 | I8 | 558
M42 Boötis º 6 © 6
2639 P,x 7 § 17 193*|15 18 5 I| 52 8 | 232'33 | 5 | I 5 | 697 | o'45 est. .. | 2 | 697
|
Micrometrical Measurements of Double Stars.
461
wº +.
QX Q)
rd §
£ 8 Epoch
> > s
261 o º P. W. 6o'341 At Hopefield, with A. C.’s 8% in equatoreal. So nearly round that I
am not sure of the elongation.
261 I {e *g- 63.2 5o Same instrument. Disks in close contact. Beautifully defined. P. very
good; D. may be o’s 5.
2612 º tº- 64'431 | Same instrument. P. good. Deeply notched, but not quite separated.
261 3 º *- 6o 341 Same telescope. Obs. pretty good.
2614 e D. I. '354 With 4-glass D. I. M. by Simms. P. pretty good; D. poor.
261 5 P. W. 6o. 36 5 With A. C.’s 83-in, equatoreal. So nearly round that no certain elonga-
616 tion can be detected. Called by 2, “Camum Wenaticorum 181 B.”
2. O I g=- 65'444 With Cooke's 8-in. Equatoreal. No perceivable elon . .
º e gation.
- & With A. C.’s 8+-in. equatoreal. A, light yellow ; B, pale blue. P. prett d; D.
26.17 6o 376 º Measured both ºjº § #. aſſººid.
iff. = o” 57. - -
2618 e - Emº 55' 534 Da : as T's y o - • ,
ylight. With A. C.’s 73-in, refr. Unsteady and flashy in general.
2619 * 59' 549. At Hopefield. With A.C.'s 84-in, equatoreal. Obs, very good. Mr.
Clark present in the Observatory.
262o º *d 60.341 | Same telescope. Perforated whole aperture (small holes) in use. Obs.
very good.
262 I e - asmº ‘52 I | BARLow-lens on micrometer. Obs. pretty good.
2622 - e With Cooke's 8-in, equatoreal. BARLow-lens on microm. P. middling;
65 466 D. indifferent. § ;
2623 tº-º-º-º: '469 Same instruments. Obs, very good.
Same instruments. Twilight. Beautifully steady, and in general sweetl
| 2624 '488 defined. Ob . y Steauy, 8. y
- & €1111CCI. S. CXCCIICI) U.
At Hopſield. With A.C.'s 8-in, refr. and D. I. M. by Dollond; constructed as a
2625 o D. I. 57°4. I 7 #. ºis wi. lens * but used as an Amician with .
- -QºI&SSQS O e l'at le].” Ullſ, CC]"t{ll Il,
2626 6, P. W. 62-628 With A. C.’s 8+-in, equatoreal. The star is very low, and the smaller
too dim for good measures.
2627 e *- 55'507 || With A. C.’s 7#-in. O. G. Obs. good.
2628 tº- 56.373 || With A.C.'s 8-in. O. G. A good notched elongation when best seen.
Obs. at Hopgfield. Same telescope. The disks have a dark line between them, but
2629 *- 57' 4OI seem to hang together, and are a little flattened at the point of contact. By
comparison with diameter of one fine web, D = o”55. t
Same telescope. Admirably seen. In contact with 526 : quite separated with 697,
263 O º *- '472 and also with 909; but the air is scarcely in a sufficiently good state for this high
power to be agreeable, though the O. G. carries it perfectly well. This telescope
6 wº § the º: Mr. Huggins F.R.S.
203 I *- 59'365 ith A. C.’s 73-in. O. G. At times well seen, and then distinctly sepa-
rated. Obs. pretty good. -
2632 º * '691 With A.C.'s 83-in. equatoreal. Well divided. P. pretty good; D. poor.
6 BARLow-lens on microm.
2033 - ‘743 | Same telescope.
2634 tº- 6o'341 P. worth little (lamp expired); D. good.
2635 © D. I. 354. With 4-glass D. I. M. by Simms.
2636 te P. W. 6 5'382 wº º: * BARLow-lens on microm. P. pretty
º good; D. worth 11ttle.
2637 *- '458 || Same instruments. P. good; D. middling.
2638 º - '47o | Same instruments. P. excellent; D. moderately good.
2639 - 57-472 At Hopefield. With A.C.'s 8-in. O. G. Star only elongated. P. pretty
good; D. a good estimation.
462
Rev. W. R. DAWES, Catalogue of


; # # * # # # *
No. Designation. 3 # # : - º Position. | f | # | # # #| # §
ão # | P: & a || 3 || > | &
l–) O O
264.o -*.*, 1938 1; 13 si 5? 8' 18725 3 || 8 || 558 o°45 est. . . | 2 || 558
2641 (continued) I9o 5 I | 7 || 43 || 558 o'5o est. . . | 2 || 558
2642 tº ºn tº e º º 190-16 || 5 || 38 || 558 o’so est. ... || 2 | 558 |
2643 || 3 Serpentis 1954 || 5 27 38| 7857 | 193: 14 || 5 || 32 526 || 3:088 || 4 || 18 || 526
2644| 193°75 || 5 || 36 || 43 I | 3' 177 || 4 || 19 || 43 I
2645 192'38 || 5 || 37 375 || 3'o.42 || 4 || 22 || 375
2646 191'46 || 3 || 23 || 415 || 3:379 || 6 || 36 || 415
2647 * - 191'22 || 5 || 33 || 426 || 3:238 || 6 || 39 || 426
2648 & Coronae 1965 || 5 33 44; 52 52 || 3oo'46 || 4 || 28 || 472 | 6’41o || 4 || 28 || 472
2649 y Coronae 1967 || 5 36 27 63 14 || 281'o6 || 7 | 18 {:}} o'5 est. . . | 2 | 697
265 o º º , e - . . 282°58 || 3 7 || 486 |o-45 est. . . || 2 || 486
2651 || 4 Scorpii, AIB | 1998 || 5 56 8|Ioo 57| 1 52'20 3 9 || 558 o’6 est. . . 2 558
2652 | tº º I 58-42 || 5 || 48 || 558 |o 55 est. . . | 3 || 558
2653 a Coronae, AB| 2032 |16 9 4' 55.45| 18o 13 || 3 || 23 || 4oo || 2:432 || 4 || 22 || 4oo
2654 18575 || 5 || 38 || 472 || 2:733 || 6 || 38 || 472
| 2655 185'o; | 3 || 2 || || 466 || 2:699 || Io 78 466
2656 & e 191.48 || 5 || 26 558 || 3:078 || 4 || 22 || 558
2657 Antares 16 20 13|I 16 6| 275’71 || 5 || 28 286 || 3:675 Io 3o 286
2658 | X Ophiuchi 2055 |16 23 2. 874 I | 19:58 || 2 || 13 63o º o
2659 & Herculis 2084 |16 35 38 58 7 || 69°53 || 7 || 49 || 512 || 1:595 || 4 || 20 || 512
2660 48-40 || 5 || 43 || 486 || 1:185 || 6 || 42 || 486
2661 45' 12 || 5 || 30 || 486 || 1:363 || 4 || 13 || 486
2662 47'o6 || 2 || 14 | 635 e - tº e
2663 44-65 || 5 || 32 || 486 || 1:426 41 || 486
2664 44-35 | 5 || 35 | 486 || 1:45.4 39 || 486
2665 tº e tº e tº e 45' 15 || 5 || 36 486 || 1:256 || 4 || 28 || 486
2666 21 Ophiuchi [315]|16 44 19 88 32 | 16772 || 3 || 17 | 558 1'=est ... 4 || 558
2667 | tº º 167-65 || 5 || 27 | 558 || 1:38o | 6 || 29 558
2668 || A Draconis || 2 130 |17 2 14 35 zo. 185'47 || 3 || 25 || 424 || 2:867 || 5 || 45 || 424
2669 tº º 185'47 || 4 || 2 I 28o || 2:767 || 4 || 2 I 28o
2670 a Herculis 214o 17 7 49 7.5 26 5'o;6 || 6 258
Micrometrical Measurements of Double Stars.
463
**
Notes.
No. i ; º
§ 5
264o e P. W. 65.382
2641 sº '466
2642 * * ‘469
2643 — 57' 524
2644 D.I. 562
2645 P. W. 59,743
2646 || 3%, 5 D.I. 65.387
2647 * P. W. ‘546
2648 D. I. 60-393
2649 P. W. 57.524
2650 — 59' 365
2651 tºmº 65' 376
2652 tºº 592
2653 6, 7 | D. I. 55'483
2654 6, 7 gº-º-º-º: 6o'354
2655 6, 7 P.W. '376
2656 6, 7 tº-º; 65' 376
2657 I }, 8 sº 64'43 I
2658 e ºmº 6o 365
2659 — 55.684
2660 * 59'508
266 I © *mº 584
2662 e * '612
2663 tº * '645
2664 — '65 o
2665 tº {-ºº-ºº: '691
2666 6%, 8 * 65'592
2667 || 6, 8 * 6oo
2668 D. I. 59:729
2669 *= ‘737
2670 P. W 59:478
With Cooke's 8-in. equatoreal.
favourable. Obs. poor.
At times well seen, and then nearly separated. Obs. moderately good.
Sometimes well seen, but never really separated. P. good; D. good
estimation. -
At Hopefield, with A. C.’s 8-in. O. G. P. very good; D. middling.
Same telescope, and Amici's D.I.M. with double circular aperture, each
= 4 inches.
With A. C.’s 8+-in. equatoreal. Obs. good.
With Cooke's 8-in. equatoreal, and Amici’s D.I.M. with BARLow-lens.
Obs. pretty good.
Same telescope. BARLow-lens on the P.W.M.
At Hopefield, with A. C.'s 84-in. equatoreal, and the 4-glass D. I. M. by
Simms. Double circular aperture on O. G.
At Hopefield, with A. C.’s 8-in. O. G. Image at times good. The dis-
tance has diminished. Obs. very poor.
With A. C.’s 75-in. O. G. The small star is at times seen jutting out from the
large one ; but the air is not sufficiently favourable for this object.
At Hopefield, with Cooke's 8-in. equatoreal. BARLow-lens on microm.
Same instruments. Daylight. At times well seen, and then deeply
notched. P. good; D. a careful examination.
With Amici’s D.I.M. on A. C.’s 73-in. O. G. Occasional good views.
white ; B, greenish white.
At Hopefield, with A. C.’s 84-in. equatoreal, and the 4-glass D.I.M. by
Simms. Obs, good.
Same telescope with P.W. M. and BARLow-lens attached. Obs, excel-
lent. Measured vertically.
With Cooke's 8-in. equatoreal. BARLow-lens on P.W. M. A., light yellow ; B,
greenish yellow. P. very good; D. good.
With A. C.’s 83-in. equatoreal at Hopefield.
enough; A is pretty quiet. -
With A. C.’s 8+-in. equatoreal at Hopefield. BARLow-lens on micro-
meter. Clouded suddenly.
At Wateringbury, with A.C.'s 73-in. O. G.
sadly unsteady.
At Hopefield, with A. C.’ 8+-in. equatoreal, himself being present. At times
beautifully defined and almost perfectly steady, but often strangely contorted.
Night apparently splendid, but un-
A, yellowish
A, red ; B, green, B is obvious
Image at times good, but
Daylight. tº * *
Same instrument. Daylight. P. pretty good; D. indifferent.
Daylight. Clouded. Obs. pretty good.
Daylight. Obs, good.
Often well seen, but not very steady. Obs, very good.
Sun shining brightly. Obs. very good. begun at 5" 12" G.M.T. Often
very well seen. e
At Hopefield, with Cooke's 8-in. Equatoreal, BARLow-lens on microm.
Elegant object; both stars very white. P. moderately good.
Same instruments. Both stars very white.
At Hopefield, with A. C.’s 8+-in, equatoreal, and the prismatic crystal micrometer
made under my direction by Dollond for Mr. Bishop in 1843. Obs. nearly perfect.
Same instruments. Obs. middling. *
At Hopgfield. Obs. by Mr. Alyan Clark, with his newly-invented 2-eye-piece P.W.
M., on his 83-in. equatoreal which he has erected in Hopefield Observatory.
464 Rev. W. R. DAWEs, Catalogue oy

# = 3| R.A. | N.P.D. #| | | # à | # | 3 | #
No. Designation. 3 #2. º Position. # 3 É # ; .# É
eSigmation #3 1850 isso. I # º Ø- º # 5: P-
h m s O J O //
267 I | a Herculis 2 14o 17 7 49| 75 26 º 5°o37 || 6 || 24 || 232
2672 (continued) e e I 16-60 | 3 || 23 424 || 4-859 || 5 || 4o 424
2673 p Herculis 2161 |17 18 31|| 52 43 || 308.63 || 3 | 16 || 424 || 3-735 | 3 | 16 || 424
2674 | • - 3o8:46 || 3 || 24 424 || 3.825 || 5 || 4o 424
2675 tº º º 309'o8 || 6 || 47 28o || 4:038 || 6 || 47 28o
pi Herculis - º & a . .
2676 et Comes } 2220 |17 4o 35|62 11 242-60 | Io 7o 286 || 3 I-675 || 6 || 27 | 286
2677 ſº º º 243-84 || 7 || 59 286 || 31' 136 || 6 || 39 286
Herculis,
2678 㺠17 4o 33| 62 I I 58-97 || Io 36 {; I '853 || 4 || 4 || 697
2679 or a Here, B.C. - 6o'o8 || 5 || 13 526 | 1.75 est I | 2 || 526
268o 58-91 || 5 || 24 286 || 2:304 || 6 || 2 I 286
2681 59° 5 I | 5 || I4 | . . I '422 || 4 || 8 | . .
2682 62'oz || 7 || 29 286 || 2:04o || 6 || 15 286
2683 e - º º e 77'59 || 5 || 32 286 | 1.806 || 6 || 17 | 286
% PIerculi
2684 º 17 47 36 6o 17 | 64’o 1 || 3 || 8 || 526 o' 35 est|.. || 2 || 526
2685 e de tº e 227.60 || 1 || 2 | 635 e -
Herculis ! - -
2686 * . C. 17 48 54 6o 9| 229°48 || 2 || 9 || 697 || 1: I 19 || 4 || 15 697
2687 tº wº tº 233°o 1 || 3 || 14 || 526 || 1: 124 || 4 || Io 526
2688 |70(p)Ophiuchi 2.272 |17 57 52 87 27 || 1 || 2:66 || 5 || 33 || 4oo | 6′513 || 6 || 42 4oo
2689 I 13'36 || 5 || 27 | 397 || 6’415 || 6 || 33 || 397
2690 133'20 || 5 || 34 397 || 6'516 || 6 || 36 || 397
269 I Io9'68 || 5 || 44 252 | 6’478 Io | 89 252
2692 I Io'o8 || 5 || 35 || 41 I | 6′386 || 4 || 24 || 4 II
2693 * I Io'83 || 6 || 45 || 431 || 6'602 || 6 || 46 || 43 I
2694 Io9'94 || 5 || 3 || || 424 || 6’237 || 5 || 32 424
2695 Io9'41 || 5 || 33 || 424 || 6’213 || 5 || 32 424
2696 10874 || 5 || 33 424 || 6′244 || 5 || 33 424
2697 tº º e Io9'25 || 5 || 3o 28o | 6’282 || 6 || 3 || || 28o
b) Herculi
| 2698 990) gº 18 1 20 59 27 || 347:36 || 3 || 22 || 635 | I'608 || 4 || 22 635
2699 tº º e e 347'o6 || 5 || 38 || 486 || 1:802 || 4 || 27 || 486
27,oo Ioo Herculis 228o 18 I 47 63 55 I'90 || 3 || 28 252 || 13:465 4| 27 252
27,ol 2-65 || 5 || 41 || 252 || 13:606 || 6 || 48 || 252
Micrometrical Measurements of Double Stars.
465

§ *
ro $8
5 # Epoch
No. § É 18oo + Notes.
> §
267 I • * P. W. 59'478 Same night. Obs, by W. R. D. to compare with the preceding; pretty good.
§ Same telescope and prismatic crystal micrometer mentioned above
2672 gº º D. I. 729 under tº Draconis. Obs, excellent
267 3 tº e tºmsºs 59'707 At Hopefield. With A. C.’s 83-in. equatoreal, and the prismatic crystal
microm. above mentioned. Obs. pretty good.
2674 *=º ‘729 | Same tel. and microm. Excellent obs. A little uncertainty in the
value of the micrometer scale, the BARLow-lens being used with it.
267 5 e ‘e m=ºg '737 sºments Obs. excellent, but the same slight uncertainty in the scale of
1SU8. In Ce,
2676 sº tº P. W. ‘754 At Hopefield. With A. C.'s 83-in. equatoreal. The stars B and C,
which constitute the Comes, certainly point rather to the north of 2.
2677 tº gº ſºmºsºmsº ‘757 | Same instruments. Obs. very good.
With A. C.’s 8-in. O. G. at Hopgfield. Discovered to be double by Alvan Clark with
2678 Ioš, I I tº e 57-472 his 73-in O. G. in July, 1856. Seen double with powers 312 to 697. Best
measured with 697.
267 9 || Iok, I I {-º- ‘562 | Same telescope. Night remarkably brilliant, but the stars unsteady.
O; {-º '6 With A.C.'s 83-in. equatoreal. Both stars white. Very difficult in
268o | I ok, Io; 59'05o distance. P. good; D. indifferent.
268 I wº *E=º '691 Obs. very poor. Bright moon; mags. estimated II and I 13, but too small.
2682 IO, Io; * ‘757 Well seen at times, yet very difficult in dist, as the smaller star bears
but little illumination.
2683 || Io:#, Io; *=º 64'43 | | With sameinstruments. Undoubtedly binary. Annual motion = + 3°12 --
& g *-º e pse At Hopefield. With A.C.'s 8-in. O. G. Discovered by Alvan Clark
2684 || 8.2, 8.2 57'562 in July 1856, with his telescope of 7#-inches aperture.
2685 tº 59-653 | With A. C.’s 83-in, equatoreal. Too close ; no good to be done with it.
l *º & At Hopefield, with A. C.’s 8-in. O. G. Discovered by Alvan Clark in
2686 Io, Io; 57-472 July, 1856. Neat little object.
2687 | 8.3, 8:8 * ‘562 | Same telescope: most brilliant night, but the stars are unsteady.
2688 g D. I 55-655 With A. C.’s 73-in. refr. and Amici's D. I. M. Sadly unsteady.
2689 º º P. W. '684 | Same telescope, and P. W. M. Sadly unsteady and ill defined.
2690 tº º *º '690 | Same telescope and microm. Very unsteady and flashy.
& At Haddenham. With A. C.’s 8-in. refr. and Amici’s D. I. M. with
2691 , D. I 57' 532 elliptic aperture. Obs. excellent.
2692 * > P. W. ‘57 I Same telescope, and P. W. M. Flashy and unsteady, though at times
well seen. Obs. good.
26 D. I •626 Same telescope, and Amici’s D. I. M. with double circular aperture. Fine night.
93 * & = & \ Obs. excellent.
* e With A. C.’s 83-in. refr., and the prismatic crystal microm. made by Dollond for
2694 e Լ *=s 59.707 Mr. Bishop. Angle measured by placing the stars in a line at equal intervals.
Obs. pretty good.
2695 tº *º- ‘72 I | Same telescope and microm. Obs. good.
2696 tº *º ‘729 | Same telescope and microm. Good obs.
2697 º º tººs ‘737 | Same telescope and microm. P. indifferent; D. good.
- * At H. ld. Discovered by Alvan Clark in my observatory on Ioth July, 1859,
2698 º º P. W. 59 61.2 º;; ##"...º. erected. A beautiful jº %iºn at {i,j}
2699 || 6, Ioš gºsº '650 | Same instrument. Well seen; a sweet little miniature of 3 Cygni.
Obs, good. d Amici's D
* At H !d, with A. C.'s 8-in. O. G., a mici’s D. I. M., and double circular
27,oo 6, 6 D. I. 57 557 s: == * sº iºd bº. parallel webs for h." © C1PCUllal
27o I 6, 6–– sºmeº 562 Same instruments. The northern star thought rather the smaller. Obs.
5 excellent.
Roy AL ASTRON. Soc. WOL. XXXV.
3 O
ſo on 5070700 “STAVOI “I M. Aeºſ 997



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Micrometrical Measurements of Double Stars.
467
o, +.
Q) Cl)
rd $
É 8 Epoch
No. § É 18oo + Notes.
cº • gººd
s: >
27oz tº º P. W. 57-571 same telescope. Clouded. These obs, are good.
te e e A very small star follows to the south; angle and dist, from the southern
2703 || 6′5, 6' 5 * 579 star of 100 Herc. = P. 123° 5; D. 74”-H. Mag. I 1.
2704) 64, 6% D. I. .626 Amici's D.I.M. and double circular aperture=4 inches. Obs, excellent.
32 ° 3 Fine views at times. :
27 O tº e * & At Hopefield, with A. C.’s 8+-in. equatoreal, and prismatic-crystal D.I.M. made
705 59°729 under my direction by Dollond for Mr. Bishop in 1843.
27.06 g * 59'729 Same instruments as used on 4. Lyrae under same date. P. good; D.
very good.
2707 te *==º 65.7 54 With 4-glass D.I.M. by Simms on Cooke's 8-in. equatoreal. Oval aperture 8 × 4
inches. P. moderately good; D. very poor. Images very fidgety. Good round disks.
27.08 || 7, II P. W. 59-63 I At Hopefield, with A. C.’s 8+-in, equatoreal. Discovered by me 1859, Aug. 15. A,
white; B, bluish P A pretty and very delicate object. P. good; D. fair.
2709 tº e *=s '634 | Not well seen in general. Driving clock stopt, and obs, interrupted.
27 Io 7' 5 I I tº º •6 Well seen ; remarkably steady. Obs. excellent. Mags. gauged.
39 y y gS. gaug
271 I e ‘º gºmºi '65o Thick air, and the small star is faint, but the obs, are good.
27 I 2 || 7-3, I I &===º '691 Unsteady and difficult. Power not recorded,
27 I 3 tº Lº * 60-696 || Obs. good. Well seen, but not very steady.
27 I 4. e º D. I. 5 97 43 With A. C.’s 8+-in. equatoreal refr. and prismatic-crystal D. I. M. by Dollond.
Scale of dist. not very º tº: º being applied to it.
l 6 With A. C.’s 83-in. equatoreal. Since HI, all observers have failed to see the faint
27 I 5 6}, 8% P. W. 62 68 3 star C I noticed it in Oct. 1859, immediately on applying my eye to the telescope.
27 I 6||73, I I } sº 59'855 With A. C.’s 84-in. equatoreal Detected by me 1859, Oct. 5. Cloud
is forming; obs, very poor.
27.17 tº º * 59'532 At Hopefield, with A. C.’s 83-in. equatoreal. At times surprisingly well seen, and
Y measured with little difficulty. Mr. Alvam Clark present during the observations.
2718 tº º wº 56 5 Stars well defined and pretty steady. Obs. very good. Mr. Clark left
Hopefield yesterday. -
27 I 9 gº tº wº 612 | Beautifully seen and at times very steady. Obs, excellent. The object never before
so well seen, or so easily measured. :
1. *ms © With Cooke's 8-in. equatoreal. When best seen, the small star is quite plump and
272O 33, 8 65 359 round, and free from the first bright ring round 3 with apertures down to 5’7 in.
272 I 3, 8 &= -º- 388 Same telescope. BARLow-lens on micrometer. Beautifully seen. Obs.
very good. -
tº-sº e with Å. C.’s 8+-in. refr. Discovered by me 1859, Aug. 15. Disks just in loose con-
2722 8, 9 59 63 I tact, with a º line between them. Obs. vºy good.
2723 8°o, 9°o tºmºmº '655 Same instruments. Mags. gauged; mag. of whole object=7°7. A, white;
B, lilac 2
2724. © e mºs 6 5’74o With Cooke's 8-in, equatoreal. BARLow-lens on micrometer.
}. 8 •6 With A. C.’s 84-in. equatoreal. Discovered by A. C. 1858, Aug. 8. A
2725 | 73, *-º- 59.9% good measurable elongation, sometimes notched.
2726 6, II gº .612 || With A. C.’s 8+-in. refr. Discovered by him in my Obs’, 1859, July 19.
7 5 # 59 A delicate object. It is B.A.C. 6959. P. pretty good; D. indifferent.
I I } * •6 I Cygni. With the same instruments. Discovered by A. C. in my Observatory
27.27 6}, - 3 59 2 *ś July 6. An exquisite object, beautifully seen. Obs. excellent.
27.28| 6%, 1 I } * .661 | Same instrument. Delicate object, A, yellow. P. good; D. pretty
fair.
2729 tº º D. I. 55'767 y Delphini. With A.C.'s 73-in. refr. and Amici's D.I.M.
tº At Hopefield, with A. C.’s 8+-in. equatoreal and prismatic crystal D.I.M.
273 o tº º 59.721 by Dollond. *
273 I gº '727 Same telescope, but with BARLow-lens on microm. Scale of distance
rather uncertain. Obs, very good.
2732 tº º sº '743 | Same instruments. Distance scale rather uncertain.
468 Rev. W. R. DAWEs, Catalogue of


# = s. R.A. |N.P.D. # | # | # à || 3 || 5 | #
No. Desigmation. 3 & 2. 185o. 1850. Position. # "aş ź .# É "as g
4. % c. # B: & ſº # B | \,
g h m sl o f l o * // —
2733| A Cygni [413]|2O 41 34 54 3| 96.51 || 3 || 23 || 486 || O'717 || 4 || 23 || 486
2734 gº º ge 92.51 || 7 || 4 || || 48o o'686 || 4 || 14 || 48o
2735 | I (6) Equulei 2737 |zo 51 35|86 17 | 285'59 || 7 || 45 835 | I to 43 || 6 || 24 || 486
2736 A B vº º tº 285-17 | 5 || 28 || 772 o'865 || 6 || 21 772
2737 || 2 (A) Equu 2742 |zo 54 49|83 24| 224-06 || 4 || 17 | 28o || 2:569 || 4 || 17 | 28o
2738| Anonyma. [431]|21 5 51 49 2 I | I 18. Io || 5 || 38 || 2 | 3 || 3:390 || 4 || 29 213
27.39| P: XXI, 5o [432]|21 8 34 49 28 || 126°41 || 5 || 27 || 486 || 1 oz7 || 4 || 13 || 486
274O | A. Z. XXIV. I I 2 I to 50 26 Io 246-29 || 3 || 24 || 375 o'85o 4 16 || 375
2741 || T A. C. 19 - 246.08 || 5 || 39 || 486 || o'882 | Io 63 || 486
2742 246-13 || 3 || 23 || 486 || O'873 || 4 || 25 || 486
27.43 246.65 || 3 || 22 || 375 I'o68 || 4 || 13 || 375
2744 e a © tº ... 244'53 || 3 || 24 || 455 o'977 | 6 || 3 || || 455
2745 | H II. 62 [443]|2 I 3o 7|83 58 || 348:62 || 3 || 22 || 2 || 3 || 8.32 I | 4 || 32 || 2 I 3
2746| L. 42.240–1 2 I 33 o 47 zo] 72°33 || 7 || 34 286
2747 = D 15 - 72°15 || 5 || 37 || 375 gº tº gº tº
2748 73-30 || 5 || 3 | | 375 | 1.606 || 6 || 35 | 375
27.49 ſº tº 72°12 || 7 || 33 || 375 || I-657 || 4 || 12 375
2750 | 75 Cygni 21 34 18|47 24 || 322-13 || 3 || 23 || 375 || 2:883 || 6 || 3 || || 375
27; 1 | * A. C. zo 321'49 || 5 || 24 || 486 || 2:999 || 4 || 19 || 285
2752 e tº ... 323'44 || 5 || 35 | 375 || 2:836 || 4 || 2 | | 375
2753 u Cygni 2822 |21 37 26 61 56] 1 15.67 || 3 || 2 | | 28o || 4-72+| 6 || 35 | 28o
27.54| Anonyma [452]|21 48 8|83 28 || 182-65 || 3 || 15 375 | I 189 || 6 || 17 | 375
2755 & Aquarii 2909 |22 21 6|9o 47 || 34o 33 || 5 || 46 || 486 || 3:469 || 4 || 35 | 486
27.56 - 340-41 || 3 || 24 || 486 || 3:413 || 4 || 24 || 486
2757 341-21 || 5 || 38 || 486 || 3:493 || 4 || 28 || 486
27.58 *g 341-40 || 4 || 20 28o || 3:363 || 4 || 20 | 28o
2759 340-50 || 3 || 19 || 486 || 3:333 || 4 || 19 || 486
2760 tº ſº. to º 336-33 || 3 || 19 || 48o || 3:326 || 4 || 22 || 48o
2761 || 37 Pegasi || 2912 |22 22 23|86 20 || 1 1983 || 3 || 19 || 486 G tº tº ºn
2762 H I. 39 3062 |23 58 25 32 24| 265-61 || 5 || 32 || 375 | 1.396 || 6 || 34 || 375
B. A. C. 837.2
Micrometrical Measurements of Double Stars.
469
E # Epoch
cº .9
> >
- o At Hopefield, with A.C.'s 84-in, equatoreal. Very well seen, and neatly
2733 || 5, 6 P. W. 60-8 II divided. Both white.
2734 © sº- 66'994 With Cooke's 8-in. refr. Sid. T. of Obs. = 21h 4om = about 3h P.M.
- At times well separated, but very tremulous. Obs. pretty good.
2735 * 59'672 With A.C.’s 8+-in. refr. Well divided and at times pretty steady P.
pretty good; D. indifferent. -
2736 - e. * - 63-855 | Same telescope. BARLow-lens on micr. P. middling; D. rather poor.
2737 D. I 59743 || With A.C.'s 8+in, equatoreal and the prismatic crystal D.I.M. Used
with BARLow-lens.
2738 8, 8% P. W. 59'877 Same telescope. Obs, good.
2739 7, 7% sº- 59-679 Same telescope. P. pretty good; D. indifferent.
tº- Witl tel . A. C. di d this star i Ob tory, 1859, July 8.
274O | 7, 7+ 59 699 || Wºłºś.
274 I | 7, 7% *- ‘757 | Same instruments. Obs. very good.
2742 | 73, 7} + - 60-696 | Same instruments. Both stars very white. Obs, excellent.
27.43 © *- '699 || Very fidgety. P. pretty good; D. indifferent.
- - o With Cooke's 8-in. refr. At times well seen, but usually very unsteady.
2744 -> 66 830 P. moderately good; D. indifferent. }
2745 || 7#, 8. ºme 59-653 || With A.C.'s 83-in. refr. Both stars white. Obs, very good.
1 *- º With same telescope. Discovered by me, 1859, Oct. 24. A, pale yel-
2746 | 73, II+ 59'869 low ; B, lilac. Very difficult. j 5
2747 | 73, Io; - 6o'68 5 A, pale yellow; B, lilac. Elegant object. P. excellent. Suddenly
clouded and precluded distances.
2748 *- '699 Same instruments. Obs. pretty good.
2749 73, II cºmmº- ‘8o3 | Same instruments. Obs, good.
With same instruments. Discovered by A. C. in my Observatory, 1859, July 19.
2750 5 #, I I *- 59-609 Well seen at times. The small star bears a good illumination. P. very good ;
D. pretty fair. :
275 I 5, 1 I # *- '655 | Same instruments. A, deep yellow. Obs. pretty good.
2752 5, II *- 60-803 || A, deep yellow. Obs. very good.
- e With A. C.’s 8+-in, equatoreal and prismatic crystal D.I.M. by Dollond.
27.53 D. I. 59'743 BARLow-lens on microm. and the distance, scale not very certain.
754 || 8, 9 P. W. 59'690 With same telescope. P. pretty good; D. indifferent. Sky hazy.
2755 4, 4-H. *- 59:6 39 At Hopefield. With A. C.’s 8+-in, equatoreal. Obs, excellent.
6 sm- •656 Same instruments. A most splendidaurora. The streamers reach far south
275 5 of . Aquarii, and almost to Fomalhaut. Aug. 28th. Obs. good.
2757 © e * - '679 || P. very good; D. pretty good.
o With the prismatic crystal D.I.M. by Dollond. BARLow-lens on micr.
27.58 e D. I. 743 *and distance-scale rather uncertain.
27.59 º P. W. ’877 Obs. pretty good.
| 2760 © gº- 66,994 || With 8-in, refr. by Cooke. Obs, moderately good.
With A.C.’s 8+-in. equatoreal. Obs. pretty good, but a rapid deterio-
2761 º - 60-696 ration of the air precluded measures of distance.
2762 © e sº- 63.860 At Hopefield. With A. C.’s 83-in. equatoreal. Obs, good.
47O Rev. W. R. DAWEs, Catalogue of
Synopsis of Mean Results of the Observations in the Appendia.
r- w, o, § * * , c.
## 3 || 3 || 3 #| 3 || 2 | # | # § 3
Designation. : #3 #. Nº. Position. # # Distance. # § # É # # i :
&c. #| |z #| 3 |Z #| # .3 || 3 -
L] O --> > s: >
- O -
h m sl o , O A/ -
36 Andromedae 73 o 46 57| 67 11 || 34o 28 || 8 || 65|| 2 || 1 189 |Io 7o || 2 |486 || 6, 6} | P. W. 59-83
L 2362 = D 8 1 11.24 46 5o || 139°78 || II | 85 || 3 || 2:678 || 14|107 || 3 |449 || 7-7, 9°o - 59'74
L 2634 = A.C. 14 I 19 32| 48 o 95'65 | Io 75 || 2 | o'78o 14 | 88 || 2 |430 || 8°o, 9°o - 59'8o
3o (whº) Orionis 5 1859|87 2 || 324°oo || 4 || 25 || 2 || 2:756 || 6 || 28 || 2 |476|| 5, 1o - 63-86
Castor II Io || 7 25 1 57 47 || 244-25 | 18 |Io4 || 4 || 5'382 |32 |185 || 4 || 34o łº 57'34.
242.77 |zo |139 || 3 || 5' 395 | 16|106 || 3 || 505 P.W.; D.I. 6o"22
242'o8 |13| 95 || 3 || 5:450 | 16|Ioš | 3 |602 P. W. 63’51
242° 11 |18 || 96 || 3 || 5'492 || 8 || 58 || 2 |409 D. I. 64’30
241°49 || 6 || 4o || 2 || 5'761 | Io 53 || 2 || 5 II - 65' 30
© tº tº 6 a tº a e 241-45 Io 75 || 2 || 5’ 678 Io | 72 || 2 || 636 P. W. '31
& Cancri A B | 1196 || 8 3 36 71 54 || 28.1°o4 || 5 || 37 || 1 || o'700 || 4 || 22 || 1 |486 - 6o 26
262.5o || 5 || 4o || 1 || o'667 || 6 || 4o || 1 |486 - 63'25
253’ 18 Io 62 || 2 || o'707 || Io 44 || 2 || 486 - 64'29
© tº tº a 243'42 | 13 | 62 || 3 || o'631 | Io || 51 || 2 || 583 - 65°30
y Leonis 1424 || 10 1 142| 69 24 || Io9'23 || 13| 95 || 2 || 3' 127 | 6 || 29 || 2 |486 * 59°37
a y 11o:33 ||25 |18o || 5 || 3:096 |26|177 || 5 || 538 P.W.D.I. 6o. 37
I Io'o'7 || 5 || 32 | I | 3’ or 4 || 4 || 19 || 1 || 486 P. W. 64' 50
11 o'27 || 4 || 27 | 2. tº gº & D. I. 65' 34
- O tº o IIo:30 || 5 || 5o || 1 || 3' 175 57 | 1 || 558 2, 3} | P. W. 65'40
# Ursae Majoris | 1523 || 11 Io Io. 57 38 || IoS’21 || 13 88 || 2 || 2:88o 42 | I 534 tº- 6o:32
tº e tº ºn • * e G 93'96 || 3 | 18 || 1 || 2:42.3 || 4 || 20 | 1 || 486 *- 64' 50
y Virginis 1670 | 12 34 4. 9o 38 || 171° 18 ||25 |17o || 4 || 3'362 18|Io8 || 4 |452 D. I. 55' 33
6 º' I71' 17 | 20 |143 || 4 || 3:308 || 18 |IoI | 3 || 593 P. W. “46
17o'o8 |45|277 || 7 || 3' 586 || 7o 342 || 7 || 329 D. I. 57°35
169'93 || 6o 394 || 6 || 3: 561 |52 |327 | 6 || 4:30 P. W. '42
168°78 |42|323 || 8 || 3:682 || 36||234 || 8 || 394 || | — 58:45
168°24 || 23 |16o || 5 || 3'775 27 184 || 5 || 395 4- 59'46
166'54 || 23 |165 || 5 || 3’949 || 14 |Io4 || 3 |466 P.W.D.I. 62'o:
165'44 20 || 38 || 4 || 4: 105 |18 |io4 || 4 || 529 P. W. 64'44
e is to tº • tº I64°o2 |33 |22 I | 7 || 4:373 || 28 16o | 6 || 539 — 65°42
* Böotis 1877 14 38 26 62. 17 || 323°63 || 7 || 42 || 1 || 2.638 || 4 || 23 || 1 |4oo *- 55" 53
324'42 | 13|IoI | 3 || 2:832 || 14|95 || 3 || 534 — | 6o oš
... • 325'50 | 15|IIo || 3 || 2'917 | 17 | 82 || 3 || 558 — 65°48




Micrometrical Measurements of Double Stars.
47 I

#: # +5 º # +s tº § § § #.
Designation. ; #3 #. * Position. # # # Distance. É # # : # # º §
º Úº Up Q) *4
*o. à B: 2. 6 B: |z # § § §
h m 8 O y O - // -
n Coronae 1937 |15 17 o' 59 Io. 32.2°46 || 7 || 44 || 1 || o'45 (est. 3 || 5 I2 P.W. 55' 51
341 71 | 12 || 35 | 1 || o'45 (est. . . || 3 || 526 e- 56'37
, 350-81 |17|117 || 2 | o'598 || 1 || 38 || 2 |711 – 57°45
5' 51 || 17 |IO4 || 3 || o'721 | 20 | 66 || 3 || 541 - 59'62
© e 8’44 || 6 || 42 || 2 | o'866 || 8 || 33 || 2 ||479 P.W.D.I. 60:35
• * e - a tº º 27°52 | I 3 || 85 || 3 || 1 of 3 | 16 || 56 || 3 || 514 P.W. 65'44
º } 1938 || 5 18 51 52 8, 190°o7 | 15 | 89 || 3 || o'48 |est. 6 || 3 || 558 - 65'46
# Scorpii A B | 1998 || 5 56 8|Ioo 57 156'91 || 8 || 37 || 2 | o'57 |est. 5 || 2 || 558 - 65'54
& Herculis 2084 |16 35 38|| 58 7| 45.79 |27 |199 || 6 || 1.336 26||136 || 5 || 506 - 59-61
21 Ophiuchi | [315] 16 44 19 88 32| 167-62 || 8 || 44 2 I'334 || 7 || 33 || 2 || 558 * 65'6o
2 Draconis 2130 |17 2 I4 35 20, 185'47 || 7 || 46 || 2 || 2:835 | 9 | 66 || 2 || 352 D. I. 59:73
& Herculis 2161 |17 18 31|| 52 43| 308'83 |12 || 87 || 3 || 3'908 || 14|103 || 3 || 376 — 59°73
a Here, A &#8|2220 |1740 35' 62 11| 243' 17 |17|129 || 2 || 31-356 |12 ||66|| 2 |286 P.W. 5976
º, Herculis BC 17 4o 33 62 11| 59:26 15 49 || 2 | 1.819 || 5 || 6 || 2 || 612 | tº- 57°50
- 6o:38 17 | 67 || 3 || 2:054 | 16 || 44 || 3 |286 - 59'7o
& © a tº gº tº 77'59 || 5 || 32 || 1 || 1.806 || 6 || 17 || 1 || 286 a tº - 64'43
>k Herc. -A.C.9 17 48 54 6o 9| 231'63 || 5 || 23 || 2 || 1: 121 || 8 || 25 || 2 ||612 || 8:3, 8.8 *- 57°53
L 32856 °
70 (p) Ophiuchi 2272 |17 57 52| 87 27, 113-27 | 10 | 61 || 2 || 6’468 |12 || 69 || 2 |397 © tº * 55'69
I lo' 27 | I I | 89 || 2 || 6’ 520 | 16|135 || 2 || 342 D. I. 57' 58
tº º Io9'33 |2O |127 || 4 || 6’243 || 2 I |128 || 4 || 388 º wº- 59'72
º } 18 1 20 59 27, 347° 15 || 8 || 6o || 2 || 1:715 || 8 || 49 || 2 || 56o 6, 10% P.W. 59-64
1oo Herculis 228o 18 I 47| 63 55 2°53 || 8 || 62 || 2 | 1.4°og8 || 12 | 89 || 2 |41.1 || 6’ 5, 6' 5 *- 57' 58
a - 2.38 14|117 | 3 || 13736 | 16|124 || 3 ||252 D. I. "59
L 35816 = D 9 18 59 58||46 20, 179'53 ||34 |24I | 6 || 2' 162 | 24 125 5 |446 || 7-4, II | P.W. 59'79
3 Cygni 2579 |19 4o 17| 45 14| 357'72 | 17 |126 || 3 | 1.675 |22 |135 | 3 || 536 | . . — 59° 58
• * e e 349-62 Io | 68 || 2 | 1.675 16|Ioo || 2 |492 || 34, 8 cº- 65.38
>k Vºle } I9 42 66 6. 314:36 to 62 || 2 | o' 55 est.| 6 || 2 || 546 || 8, 9 *- 59'64
44 Cygni = A.C. 18 . . . 20 25 18| 53 34 155’29 || Io 65 || 2 || 2'502 || Io 59 || 4 |46o 6%, 1.1% - 59.63
y Delphini 2727 |2O 39 42 74. 25, 272°o'7 | 18 |I33 || 4 || 1 I'623 |19||140 || 4 || 305 tº D. I. 59°o 5
A4, ºr 21 Io 5o 26 Io. 246' 16 || 8 || 63 || 2 | o'876 || 14 || 79 || 2 || 430 || 7, 7+| P.W. 59'73
- º 9 246'38 || 6 || 45 || 2 || o'929 || 8 || 38 || 2 |430 74, 7} + *- 6o'7o
© tº 244'53 || 3 || 24 || 1 || o'977 || 6 || 31 || 1 |455 | – | 66.83
L 42240 = D 15 2 I 33 o' 47 20 72°45 24 |I35 || 4 | . . 353 | 73, II — | 6o'51
s & I ‘619 || Io 47 || 2 || 375 || 7}, II - ‘73
75 Cygni = A.C. zo] . . 21 34 18|47 24, 32.2'5o | I 3 || 82 || 3 || 2:876 || 14 || 71 || 3 || 345 || 5}, II *- 6o 13
& Aquarii 2909 |22 21 6| 9o 47| 34o 33 || 16|127 || 4 || 3'438 | 16 |IoG | 4 || 486 || 4, 4 + tº- 59'69
*
NOTES ON THE DOUBLE STARS
IN THE AIPPIEN DIX.
1855°o to 1867°o.
No. 2486 = A. C. I.
Of this excessively close double star, discovered by Mr. ALVAN CLARK, I have no measures.
for comparison with my own.
No. 2487 = X 73 = 36 Andromedae.
The continued increase of the angle is well sustained by recent observations, while the
distance does not appear to have undergone any considerable variation. . The following
epochs are available for comparison since 1855'o.
I 855’29 P = 336'59 D = 1467 M on 3 m.
56'o8 335'94. 12+ DE on 9 m. with 54-in. dialytic refr. by Plössl.
57 27 339' 19 1.202 SE on 3 n. with 9-6-in. refr. by Merz.
57.75 34o 3o 1' 392 M on 5 m. (D on 4).
58°o4 34 o' I 4 I'336 M on 5 m. (D on 4).
59'83 34o 28 1.189 DA on 2 m. with 84-in. refr. by Al. Clark.
65'69 344-85 1'353 KN on 3 m. with 74-in. refr. by Al. Clark.
No. 2489 = D 8.
I am not acquainted with any other measures of this double star than my own. It
is L 2362.
No. 2494 = A. C. 14.
Discovered by Mr. ALVAN CLARK. My own are the only measures of it that I am
acquainted with. This star is L 2634.
Micrometrical Measurements of Double Stars. 473
No. 2496 = X 186 = P I. 209.
There can be no doubt that this double star, discovered by STRUVE, is a binary system.
It does not appear to have been much observed, but the comparison of STRUVE's results
and my own shows it to be worthy of more attention.
1825'81 P = 60°oo D = *370 2 on I n.
31.8o 56'44 o:960 H on 2 n. with 5-in. refr.
32-88 66.30 I 187 X on 3 n.
33'83 62.9 I 5 SM
4 I'70 - 61°30 o:970 X on I n. with 15-in. refr. at Pulkowa.
46. I I 65. Io o'8oo O > on I n. with same.
51-88 Single 2 º º O > on 1 n. with same, power 416. “Unfavourable.”
59'81 8 I'o6 o'5 est. DA on 1 m. with 83-in. refr. by Al. Clark. Elon-
- - - gated; sometimes notched. •.
63-85 85’ I 5 o'3 est. DA on I n. with same.
The observation at Pulkowa in 1851 is noted as doubtful, the air being in a bad state;
and it seems most likely that the star was not really single at that time; for, if so, it is highly
improbable that it should be elongated, and even notched, with so much smaller a telescope
eight years afterwards; and that in four years more it should be so much closer as to be
scarcely elongated at all. In 1852 I examined it, and found it decidedly separated, even on a
bad night, with my 63-in. refractor by MERz. In 1856 I estimated P = 75°-i- ; D = o”7.
The components seem, therefore, to have been gradually approximating; and the star may,
perhaps, now be single.
B + C
2
No. 2498 = 2 205 = H III. 5 = y Andromeda, A and
This splendid object, discovered as a double star by H, appears to be stationary, both in
position and distance. A few epochs will suffice for comparison of results,
O //
1821'91 P = 64.77 D = 1 o'909 H and S on 1 m.
3o'oz 62'44 1 o' 332 X on 6 n.
32’94 64 oš Io-626 DA on 3 m. with 3.8-in. refr.
54'94 63.23 Io'48 I DE on 5 m. with 53-in. dialytic refr.
63-86 64'2O 1 o'47o DA on I n. with 83-in. refr.
65-67 63'43 I o'364 KN on 4 m. with 73-in. refr. by Al. Clark.
No. 2499 = O > 38 = y Andromedae, BC (or y, Androm.).
My measures continue to indicate a decrease in the angle, while the distance remains
stationary. For comparison of recent measures we have,
ROYAL ASTRON, SOC. Vol. XXXV. 3 P
Rev. W. R. DAWEs, Catalogue of
1856-12 P = I 16.7 5 D = cº; est. J on 1 m. with 6'3-in. refr. by Lerebours, at Madras.
56-90 Io9'75 o'468 SE on 3 m. with 9-6-in. refr. by Merz.
58'06 II 3 '99 ... J on 2 n. with 6'3-in. refr.
58'99 Io8' 52 o'45 SE on 3 m.
59'81 I ob'74 o'535 DA on 5 m. with 83-in. refr. by Alvan Clark.
63-o8 Io8: 19 o'4 DE on 7 m. with 73-in. refr. by Merz.
63-86 Ioy'70 o'588 DA on 1 m. with 83-in. refr.
65.68 I of 92 o:604 DA on I n. with 8-in. refr. by Cooke and Sons.
65-67 1 o'o'7 o'595 KN on 4 m. with 74-in. refr. by Al. Clark.
The more I observe this object the greater is my astonishment that the smaller star should
ever have been placed in the n. p. quadrant. I have usually noted a difference of from a half
to a whole magnitude, and have always placed the smaller star in s. f. quadrant; and I believe
that all English observers have done the same. -
Having been recently favoured by Mr. OTTO STRUVF, with all his measurements of this
object since its discovery, I insert here the mean results which I have deduced from the single
night's observations as furnished to me.
1844: 55 P = 123°58 D = &;18 O > on 5 m. with 15-in, refr, by Merz.
48°39 II 4'90 o'460 O > on 5 m.
54"I 7 I 14:28 o' 54o OX on 5 m. (D on 4).
65.2 I I I I 30 o:645 O > on 2 n.
Though the discordances among the angles obtained by the different observers are large,
yet the results by each observer at different epochs show a diminution of the angle, which
I therefore think we are justified in concluding must be real.
No. 2502 = 2 494 = H N. 17.
More recent measures afford but slight, if any, Support to the supposed diminution of
the angle ; and the measured distance is still, as before, remarkably accordant.
D = sigs SE on 3 n.
5' 196 DA on I n. with 8%-in, refr. and Amici’s D. I. M.
1857-39 P = 187;
6oo& 187 or
No. 2503 = x 554 = 80 Tauri.
The difficulty of obtaining such results as might be relied on for determining the question
of orbital motion is still shown by the discordances among the measures by that careful
Micrometrical Measurements of Double Stars. 475
observer DEMBowski, which are the only recent ones I am acquainted with. Among four
nights’ measures of position there exists a difference of 6°7.
1859’ I 5 P = 1656 D = #407 DA on 1 m. with 8%-in. refr.
62.96 7:25 1:23 DE on 4 m. (D on 1) with 73-in. refr.
No. 2504 = 30 (ºp.) Orionis.
This easy double star, strangely enough, escaped observation, till lately discovered by
Mr. G. KNOTT. Unless the small companion varies greatly in brightness, it seems inex-
plicable that it should have eluded the search of X at Dorpat, of O > at Pulkowa, and of
H both in England and at the Cape with the 20-foot reflector. .
1863. I P = 322%3 D = #95 KN on 2 n. with 74-in, refr. by Alvan Clark.
63-86 B. 3.24°oo 2.756 DA on 2 n.
65. Io 32 I-70 2729 KN on 2 m. with the same.
No. 25.06 = X 932.
The continued diminution of the angle of position confirms my conclusion that these
stars constitute a binary system.
I 859’ I 5 P = 3 32 oz D = 2561 DA on I n. with 73-in. refr. by Al. Clark.
63'41 332'27 2.267 DE on 4 m. with 73-in. refr, by Merz.
The angle is now about 10° less than it was at >'s first epoch, and I would recommend
it to the diligent attention of double-star observers.
No. 2508 = 2 I 110 = H II. 1 = Castor.
That the angle has continued its retrograde course, and the distance its slow increase, is
shown on the whole by recent observations, though not with such uniform regularity as
might, perhaps, be expected in the measures of so easy an object. It is remarkable that
SECCHI has, on four nights in 1855 and on one in 1855, placed the smaller star in the
m. f. quadrant, and suspects a variability of relative brilliancy. I must acknowledge that
I never suspected anything of the kind, nor, I believe, has any other observer.
1855'3 I P = 2436. D = 4848 M on 3 m.
55-82 24.5' I 3 5:368 SE on 7 n.
56.20, 245'44 5' 145 DE on 7 n. with 53-in. dialytic refr.
56-35 243.78 4'875 M on 6 n. (D on 4). -
476
Rev. W. R. DAWEs, Catalogue of
1856-73
57'34.
57'36
57.77
58.26
58-37
59:26
59'36
59'98
6o:22
63'oz
63'o?
63'51
64'3o
65.30
65°31
P = 24;1
244'25
242'90
24.5' 19
244'42
244.' I 3
243-88
242'70
243-62
242'77
242°75
241-66
242°o8
24.2” II
24. I'49
24. I'45
//
D = 5' 172
5.382
4.888
5'336
5-208
4-963
5’ I 56
5'o81
5' 378
5' 395
5' 537
5'381
5*45 o
5*492
5:761
5:678
J on 4 m. with 6'3-in. refr.
DA on 4 m. with 8-in. refr. by Al. Clark, and
Amici’s D.I.M.
M on 7 n. (D on 8).
J on 3 m. with same telescope.
Mo on 2 n. with Lord Wrottesley's 73-in. refr.
by Dollond.
M on 7 n.
Mo on 2 n. with same telescope.
M on I I n. (D on Io).
Mo on 2 m. with same telescope.
DA on 3 m. with 83-in. refr. by Al. Clark.
R on 11 m. with Mr. J. G. Barclay's 10-in.
refr. by Cooke.
DE on 14 n. with 7%-in. refr. by Merz.
DA on 3 m. with 83-in. refr. and P.W. M.
DA on 3 m. (D on 2) with same, and Amici and
4-glass D.I.M.
DA on 2 n. with 8-in. refr. by Cooke, and
Amici D.I.M.
DA on 2 m. with same telescope and P.W. M.
No. 2526 = X 1196 = H I. 24 = % Cancri, AB.
This very interesting binary has become very close and difficult within the last few years;
and by my own observations the position-angle has diminished nearly 72° in eleven years.
1855' 19
55.26
56'24
56.25
56:28
57'29
57'29
58:20
58.25
59:26
6o 26
63' 13
O
P = 3 12-33
3 Io:64
309'42
307' 19
307'50
3O3'92
3O4°53
297.58
299'37
294'94.
28 I'o.4.
263 II
- //
D = I 'o67
I 'o60
I I 19
o:769
o'998
o'777
o'964
I'ogo
o' 502
o'976
o:7oo
o'737
SE on 3 m.
M on 4 m.
Mo on 2 m. with Lord Wrottesley's 73-in. refr.
SE on 2 n.
M on 2 n.
SE on 6 m.
M on 3 n. (D on 2).
M on 3 m.
SE on I n. “Distance rather less than one thread.”
M on 8 n.
DA on 1 m. with 8%-in. refr. by Al. Clark.
DE on 15 m. with 73-in. refr. by Merz.
Micrometrical Measurements of Double Stars. 477
1863.25 P = 262°so D = o667 DA on 1 m. with 8%-in. refr.
64'o.4 255°42 o' 5 DE on 5 n, with 74-in. refr.
64'29 253, 18 o'707 DA on 2 n. with 83-in. refr. by Al. Clark.
65.30 243'42 o:631 DA on 3 m. (D on 2) with 8-in. refr. by Cooke.
No. 2533 = O > 200.
The result of a single set of measures of position (consisting of two observations), approach-
ing more nearly to the result obtained by O 2, negatives the idea of change having taken
place. Sudden clouding precluded measures of distance. See under No. 1280 in the Notes
on the former part of the Catalogue.
No. 2534 = 2, 1355.
My single night's observations go to show that no change has occurred in the angle
since the earliest measures, but support the probability of some diminution of distance.
See the Note on No. 1281.
No. 2535 = A. C. 5 = 8 Seartantis.
The suspicion I expressed in my note on No. 1291, that this star might prove to be a
binary system, is supported by my single night's measure in 1860; yet the distance, on a
presumed increase of which (as the most probable cause of its having been overlooked by X)
I rested my suspicion, is not perceptibly altered.
1854°2O P = so:54 D =o's 5 est. DA on 2 m. with 63-in. refr.
6o:34 38'21 o:5 est. DA on 1 m. with 84-in. refr.
No. 2536 = X 1424 = H I. 28 = y Leonis.
The slow increase both of angle and of distance is evidenced by the more recent measure-
ments, though the results are not so accordant as might be wished.
1855°34 P = 108% 5 D = 3%54 Mo on 3 n. with Lord Wrottesley's 73-in. refr.
by Dollond.
55'38 Io8'30 2.934 SE on I n.
56' 19 Io9'94 3-134 DE on 5 m. with 53-in. dialytic refr. by Plössl.
56.21 Io8'73 2.887 M on 9 n.
56.79 Io9'61 2.929 J on 3 n, with 6'3-in. refr. by Lerebours.
478
Rev. W. R. Dawes, Catalogue of
1857'34
57.76
58-38
58.87
59°34.
59'37
6o 12
6o:37
63.28
63.28
64' 50
65°34
65'40
P = 108?o
Io9'O4.
I o874
108-11
Io8'97
Io9'23
I I O' I O
II o'33
1 Io'60
Io9'29
I 1 o'o.7
1 Io:27
I Io'30
D = 2678
3’og 5
2'945
3“O47
2.92 I
3' 127
3'o'72
3°og6
3'237
2-857
3°o I 4.
3' I 75
M on 9 m.
J on 3 m. with same.
M on 12 n.
SE on 4 n.
M on 9 n.
DA on 2 m. with 73-in. refr. by Al. Clark.
Mo on 2 m. with Lord Wrottesley's 73-in. refr.
DA on 5 m. with 83-in. refr. by Al. Clark.
R on 3 n. with Mr. Barclay's 10-in. refr, by
Cooke, and P.W.M.
DE on 1 I n, with 73-in. refr. by Merz.
DA on 1 m. with 83-in. refr. by Al, Clark.
DA on 2 m. with 8-in. refr. by Cooke, and
Amici D.I.M. -
DA on 1 m. with same telescope, BARLow-lens,
and P. W. M. - -
No. 2547 = X 1500.
The position-angle seems to be still diminishing, though at an exceedingly slow rate.
Comparing my results with X's in 1832, which he considered to be the most deserving of
confidence, and also with MADLER's, and with SECCHI’s in his Catalogue of 1321 double stars,
we have,
1832°og
4. I'2O
42'24.
56:28
6o'34
O
P = 321'47
317 Io
322.87
318:35
3 I 5'83
D = o'o67
O'909
1'o65
I ‘o;3
I’ I 55
2 on 4 m.
DA on 1 m. with Mr. Bishop's 7-in. refr.
M on 3 n.
SE on 3 m.
DA on 1 m. with 84-in. refr.
The star is perhaps deserving of continued attention, though the differences may arise, as
SECCHI remarks, from the difficulty of the object.
No. 2548 = X 1523 = H I. 2 = # Ursae Majoris.
The continued diminution of the angle and increase of the distance is satisfactorily shown
in the following series; but within the last four or five years the distance seems to have
sensibly diminished, and the angular motion to have increased, being now about 3° per annum.
1855’29
55'44.
56.18
O
P = I 14:30
I I 5'69
I I I '88
D = *955 Se on 1 m.
2.87.0 M on 2 n. -
3: I 18 J on 3 m. with 6'3-in. refr. by Lerebours.
Micrometrical Measurements of Double Stars. 479
1856-26 P = 11389 D = 3%, 26 SE on 4 m.
56'34 1 12-31 3-181 DE on 7 n. with 53-in. dialytic refr. by Plössl.
56'42 112.68 2.974 M on 13 n. ge
56-82 I Io'91 2.990 J on 2 m. with 6'3-in, refr.
57.36 Io9'74 3'1 1 I SE on 2 n.
57-43. 109'66 2-746 M on 8 n.
58°oo Io8: 15 2'904. J on 4 m.
58:20 Io8'og 3.182 DE on 6 n.
58:20 I o?' Io 2.847 Mo on 2 n. with Lord Wrottesley's 73-in. refr.
58'42 108-83 2.919 M on 5 n. -
6o'o.8 IoS’25 2.844. Mo on 2 n. with same telescope.
6o 32 Io;:21 2.88o DA on 2 n. with 83-in. refr. by Al. Clark.
63' I 4 95'47 2.789 R on 4 m. with Mr. Barclay's 10-in. refr. by
Cooke, and D.I.M. *
63'5o 93°33 2'590 R on 1 n. with same telescope, and P.W. M.
63' 23 96.66 2.557 DE on 19 n, with 73-in. refr. by Merz.
64' 50 93-96 2:423 DA on 1 n. with 84-in. refr. by Al. Clark.
64'83 9 I-96 2.232 DE on 19 n. with 73-in. refr.
No. 2552 = 2, 1536 = 1 Leonis.
The angle continues to diminish and the distance to increase ; yet the results are far from
running so smoothly as might be wished or expected.
1856.26 P = 76°38 D = #568 SE on 5 m.
56-37 76-o8 2'483 M on 7 n.
57'37 76°o4 2.385 M on 4 n.
58.21 76° 59 2:640 J on 2 n. with 6'3-in. refr, by Lerebours.
58'34 76'69 2-6 est. DE on 3 m. with 53-in. dialytic refr. by Plössl.
58.35 75' I 2 2:464 M on 2 n.
60'29 76°o3 2.68o DA on 1 m. with 83-in. refr. by Al. Clark.
63.23 76-70 25 Io DE on 7 n. with 73-in. refr. by Merz.
65° 4o 72°13 2.806 DA on I n. with 8-in. refr. by Cooke.
No. 2555 = 2 1670 = H III. 18 = y Virginis.
The position-angle of this most remarkable binary has diminished about 7° in the last
Io years; and the distance has increased about 1". The following selection of results will
afford comparisons with my own. In Professor SECCHI’s Catalogo di 1321 Stelle Doppie,
480.
Rev. W. R. DAWEs, Catalogue of .
p. 9, col. 2, l. 12, for the epoch 1853, read 1855. My observations quoted in that and the
following line were made nearly at the same time, for comparison of results with the P. W.
and Amici micrometers; but the typographical error makes it appear as if the measures were
made above two years apart.
1855'33
55'39
55°4O
55°45
55-46
56. Io
56.38
56.38
56'40
57'35
57°39
57°4. I
57°42
57°42
57.96
58-34
58-37
58.39
58-40
58-45
59°37
59'44
59:46
62°og
63'33
63'40
64'44
6476
65°42
- - O
P = 171-18
172°52
171-6
I74°o 5
171-17
17o 56
171-73
171.68
I7o'42
17oo8
17o'79
1706
17o 18
16993
17o'69
168° 52
169'86
1699
172 oz
16878
169: 17
169:46
168°24
166'54
165'90
165-17
165'44
164:43
164'oz
3'372
3°4.
3°4. I 5
3.308
3'447
3°592
3’549
3-608
3'586
3'736
3’5
3'595
3'561
3’5 O4.
3'798
4°oo7
3.8
3°619
3.682
3.88o
3'912
3°775
3'949
4°o85
4' I 3 I
4' I os
4' I 3 I
4’373
D = 3'362 DA on 4 n. with 73-in. refr. by Al. Clark, and
Amici's D.I.M.
SE on 5 n.
SM
M on 2 n.
DA on 4 m. with 73-in. refr. and P.W. M.
J on 4 m. with 6'3-in. refr.
M on 6 n.
SE on 6 n.
DE on 6 m. with 53-in. dialytic refr. by Plössl.
DA on 7 n. with 8-in. refr. by Al. Clark, and
Amici’s D.I.M.
SE on 7 n.
SM
M on 9 n. (D on 8).
DA on 6 n. with 8-in. refr. by Al. Clark, and
P.W. M.
J on 5 m. with 6'3-in. refr.
DF on 6 m. with 53-in. dialytic refr. (Z – 180°).
M on 2 n. (Z — 180°). -
SM
SE on 3 n.
DA on 8 m. with 73-in. refr. by Al. Clark, and
P.W. M.
M on 9 n. (D on 8 n. Z – 180°).
SE on 3 m. p
DA on 5 m. with 8%-in. refr. by Al. Clark, and
P.W. M.
DA on 5 m. with same telescope, and various
micrometers.
DE on 18 m. with 7%-in. refr. by Merz.
R on 2 m. with Mr. Barclay's Io-in, refr. by
Cooke, and P.W. M.
DA on 4 m. with 83-in. refr.
DE on 17 n. with 73-in. refr.
DA on 7 n. (D on 6) with 8-in. refr. by Cooke.
Micrometrical Measurements of Double Stars. 481
No. 2607 = x 1678.
Both the angle and distance continue to decrease, as will be seen by the following com-
parison of results.
1856:36 P = zoś66 D = 31°987 M on I n.
58-36 2O5'54 32'44 I DE on 3 n.
58°36 2O4'84. 32750 M on 3 m. (D on I).
60°35 2O4'38 31°o72 DA on 1 n. with 83-in. refr. by Al. Clark, and
4-glass D. I. M.
No. 2608 = X 1687 = 35 Comae Berenices, A.B.
The angle continues to increase, while the distance is nearly the same.
M/
1855’29 E’ = 375; D = 1.291 SE on I n.
55°45 44°53 I'334 M. on I n.
56-39 42'20 1.265 M on 4 m.
56.41 4 I'45 I 3 I I SE on 5 n.
56:48 46’ I 5 12 est. DE on 5 n. with 53-in. dialytic refr.
57°45 44-63 1.590 DA on 1 m. with 8-in. refr. by Al. Clark.
58: 11 43'86 1.2 est. DE on 7 m. with 53-in, refr.
58: 12 43°35 I-230 M on 4 n.
6o'34 47.68 1.441 DA on 1 m. with 83-in. refr. by Al. Clark.
65'3 I 52.87 1.314 KN on 1 m. with 73-in. refr. by Al. Clark.
No. 2610 = X 1728 = 42 Comae Berenices.
This very close binary object has become much more difficult during the last few years,
and at one time was scarcely to be elongated with an 8-inch aperture.
1855:38 P = 19876 D = o';75 M on 2 n.
56'4o 19276 o' 588 M on 5 n. (D on 4).
56.96 I 92'45 o'47 I SE on 5 m.
57° 40 I 88-28 o' 50 est. M on 2 n.
58.39 I 92°5o o:3 est. SE on 1 m. “Elongated, like a figure of 8.”
58-40 196.25 o'4o est. M on 6 n. (D on 5). -
59-36 21 5-81 oºz est. M on 3 m. (D on 2 est.) “Only elongated.”
ROYAL ASTRON. Soc. VoI. XXXV. - 3 Q
482 Rev. W. R. DAWES, Catalogue of
1860'34 P = 1835; D = 32 est. DA on 1 m. with 8}-in. refr. by Al. Clark.
“Scarcely elongated.”
63'25 191'oz o:5 est. DA on I n. with same. Close contact.
64'43 I 93°4 I o'45 est. DA on I n, with same. Deeply notched elon-
gation.
No. 2613 = X 1757 = P XIII. 127.
The position-angle of this interesting binary has continued to increase ; while the distance
appears to have scarcely varied. We have the following series for comparison.
1855-3 I P = 5134 D = #7 est. DE on 4 m. with 53-in. dialytic refr.
56'32 51'82 1.5 est. DE on 2 m. with same.
56'42 51.88 2'ol 2 Mo on 2 n. with Lord Wrottesley's 7#-in, refr.
5688 52'94. I '844. SE on 2 n. - -
57'29 54°2O 2°oo8 Mo on 2 n. with same telescope. -
58-o8 52.81 1:765 J on 3 m. with 6'3-in. refr. at Madras.
- 58-37 54.78 1909 M on 2 n.
59-36 53.78 1.823 M on 2 n.
6o'34 54".3 I 2: 315 DA on I n. with 83-in. refr. and P.W. M.
6o 35 53-38 2°o8o DA on I n. with same, and 4-glass D.I.M.
63'32 59'O4 2'oog DE on 5 n. (D on 3) with 73-in. refr.
No. 2615 = X 1768 = 25 Canum Venaticorum.
Called by 2, Can. Wenat. 181, who does not seem to have been aware that it was one of
FLAMSTEED's stars. ARGELANDER, however, has recognised it as such. The approximation
of the components has continued until it is now single with an 8-in. aperture. Recent observa-
tions of it are very few.
1856-49 P = 25%; D = ".. SE on I n.
57°59 Elongated. º º SE on I n.
58-65 26'73 o'2 est. M on 2 n. -
60-36 10° or 15° o’ I 5 est. DA on 1 m. with 83-in, refr. by Al. Clark,
power 970.
65'44 Round. º º DA on 1 n, with 8-in, refr. by Cooke.
No. 2617 = X 1777 = H II. 44 = 84 Virginis.
The motion of this star in position is extremely small, if any ; and it appears to me that
its binary character is by no means certain. The discrepancies are large for the distance ;
the differences in the results which form X's mean for 1828-77 amounting to above 6°. It is
Micrometrical Measurements of Double Stars. 483
worthy of notice that the position is very oblique. The distance does not appear to have
varied. The larger star is yellow, and the smaller a fine blue.
1857'o'3 P = 23:39 D = 3.261 SE on 3 n.
58.28 23o'46 3.349 Mo on 2 m. with Lord Wrottesley's 7#-in. refr.
58-38 232’67 2.887 M on 1 n. -
60'38 233.63 3:600 DA on 1 m. with 83-in. refr.
No. 2618 = X 1877 = H I. I = a Boötis.
Recent measures seem to me to confirm the idea that this is really a binary system, though
at present in very slow motion. Unfortunately, the measures continue to be more discordant
than might be expected, except from the obliquity of the position.
1855-37 P = 323;8 D = 2,608 SE on 4 n.
55'53 323.63 2-638 DA on 1 n. with a 73-in. refr. by Al. Clark.
56°49 3.24°30 3'oz7 DE on 3 m. with 53-in. dialytic refr. by Plössl.
56.50 322°94 2'593 SE on 2 n.
57°o3 326 oë 2-639 M on 6 n. (D on 5).
57°42 32O'o; 2'903 M on I n.
57'44. 327.82 2.946 Mo on 2 m. with Lord Wrottesley's 7#-in. refr.
58'34 322'95 2-864. DE on 6 m. with 53-in. dialytic refr.
58-46 324'97 2.71 5 Mo on 3 n. with Lord W.'s 73-in. refr.
58’47 326'91 2-615 M on 7 n. (D on 6).
59°38 326'55 2776 M on 7 n.
6ozo; 324'42 2.832 DA on 3 m. with 83-in. refr. by Al, Clark.
64.81 3.24°7o 2.718 DE on 6 n. with 73-in. refr. by Merz.
65°48 325' 5o 2.917 DA on 3 m. with 8-in, refr. by Cooke.
No. 2625 = X 1888 = H II. 18 = 3 Boötis.
The slow diminution both of angle and distance continues, as is evident from the following
series. The colours are decided : “A, deep yellow ; B, flushed purple.” (SMYTH.)
O //
1855'38 P = 31 I-69 D = 6'o68 M on 2 n.
56-39 3I 2'43 5'895 M on 4 n. (D on 3).
56:45 31 o'85 5°998 DE on 8 n. with 53-in. dialytic refr.
56.88 31 o'o 5 6-oi 7 SE on 12 n.
57°4′o 3 II 2.0 5'76o M on 5 n.
57°42 3og'98 5'903 DA on I n, with 8-in, refr. by Al. Clark, and
D.I.M.
Rev. W. R. DAWEs, Catalogue of
1858'13
58.39
58'54
59°38
63' 15
63.28
64'46
65°42
O
P = 308'54
307.77
309'89
309'37
393-03
3O2'45
3oz'oo
3ol.' Io
//
D = 5'85o
5°929
5'653
5'566
5' 590
5.787
5'5OI
5'381
DE on 7 n. with 53-in. dialytic refr.
Mo on 2 m. with Lord Wrottesley's 7#-in, refr.
M on 7 n.
M on 3 m.
DE on 14 m. with 74-in. refr. by Merz.
R on 4 m. with Mr. J. G. Barclay's Io-in. refr.
by Cooke.
DE on 8 m. with 73-in. refr.
DE on 7 n. with same.
No. 2627 = X 1937 = H I. 16 = n Coronae.
The components of this most interesting binary have separated considerably within the
last few years; and from being only elongated with an 8-inch refractor, it has become an easy
object.
1855'40
55°5 I
55'73
56-37
56'59
57'39
57°45
57.48
57'95
58-51
58-52
58-61
59'38
59'48
59-62
60'35
63'o6
64'43
65'44
65°49
P = 325.64
322:46
33O'23
34. I'7 I
344-36
34.7°22
350-81
35 I'oo
355°77
359' 19
360-85
6'2O
4'97
4°5 O
5° 5 I
8’44
I9'O4.
24; 16
27°52
27:40
//
D = o'32
SE on 2 n.
o°45 est. DA on I n. with 73-in. refr, by Al. Clark.
© tº M on 2 n.
o'45 est. DA on I n. with 8-in, refr. by Al. Clark.
o°47 SE on 7 n.
o'47.5 M on 2 n.
o' 598 DA on 2 n. with 8-in. refr.
o' 578 SE on 7 n.
o°6 est. J on 3 m. with 63-in. refr. by Lerebours.
o'535 SE on 3 n.
e e DE on 9 n. with 53-in. dialytic refr. by Plössl.
o:692 M on 6 n.
o:697 M on 4 n.
o'535 SE on 4 n.
o'72 I DA on 3 n. with 73-in. and 83-in. refr. by
Al. Clark.
o'866 DA on 2 n. with 83-in. refr.
o°8 I DE on 24 n. (D on 1) with 73-in refr. by Merz.
o'7 DE on Ion. with same.
I'oZ3 DA on 3 m. with 8-o-in. refr. by Cooke.
I'oz9 DE on 9 m. with 73-in. refr.
No. 2639 = 2 1938 = H I. 17 = Pxv. 74 = 0, Boötis.
This very interesting binary system continues to be very difficult, requiring about a 9-in.
aperture to completely separate the components; the retrograde orbital motion having
amounted to about 35° in the last 12 years.
Micrometrical Measurements of Double Stars. 485
1855°53
57'38
57°45
57°47
58'57
59'38
63'22
64'41
65° 13
65° 46
P = 256.96
239'23
23 I 33
232°33
236'32
226-41
19766
193-64
186.29
190°o7
A/
D = o'425
M on 2 n.
o:35 est. M on 2 n.
o'48 SE on 3 n.
o'45 est. DA on 1 m. with 8-in. refr. by Al. Clark.
o' 325 M on 4 m.
o°433 M on 3 n.
o'5 est. DE on 15 n. with 7}-in. refr. by Merz.
o:5 est. KN on 3 m. with 73-in. refr. by Al. Clark.
o'5 est. DE on 15 n. with same.
o'48 est. DA on 3 m. with 8-in. refr. by Cooke.
No. 2643 = X 1954 = H I. 42 = 3 Serpentis.
There are certainly symptoms of continued decrease in the angle, and perhaps of a slight
increase in the distance.
1855'89 P = 1952 D = 3%66 SE on 7 n.
56-52 I93°o I 3.231 DE on 6 m. with 53-in. dialytic refr. by Plössl.
56.68 I 93'24. 3' 176 M on 4 n.
57-40 193°o? 3.374 Mo on 2 n. with Lord Wrottesley's 73-in. refr.
57' 52 I 93° 14. 3°o88 DA on 1 m. with 8-in. refr. by Al. Clark, and
P.W. M.
57'56 193°75 3' 177 DA on I n. with same, and Amici’s D.I.M.
58.21 I 92°24. 3.264 DE on 7 m. with 53-in. dialytic refr.
59' 38 I93°4o 3'225 M on 3 n. -
59'74. 192'38 3'o.42 DA on I n. with 8%-in. refr. by Al. Clark, and
P.W. M.
63'43 192°20 3' 198 DE on 5 m. with 73-in. refr. by Merz.
65°39 191'46 3.379 DA on I n. with 8-in. refr. by Cooke, and
Amici D.I.M.
65'55 191'22 3:238 DA on I n. with same, and P.W. M.
No. 2648 = 2 1965 = H II. 8 = & Coronae.
This fine double star is probably unaltered in position and distance, though in both elements
the discrepancies are greater than might appear likely in so easy an object. The obliquity
of the direction may account for a considerable portion of the differences in position ; and the
different kinds of micrometer and habits of measuring for those in distance. The following
epochs may serve for exemplification.
D = 6'ooz > on 5 n. -
6.209 DA on I n. with Mr. Bishop's 7-in refr. and
Pr. Cr. M. -
1829-70 P = 30686
43-63 3oo'78
486
Rev. W. R. DAWEs, Catalogue of
1853-83
54'55
56-49
60'39
63.56
P = 302%2
3oo-88
3o 1-71
3oo'46
3O2'27
D = 6.53
6.285
6-213
6:41 o
6-249
DE on 6 m. with 53-in. dialytic refr.
DA on I n. with 73-in. refr. by Al. Clark.
SE on 4 n.
DA on I n, with 83-in. refr. by Al. Clark, and
4-glass D.I.M.
R on 3 m. with Mr. Barclay's Io-in, refr. by Cooke.
No. 2649 = 3, 1967 = y Coronae.
This highly interesting binary system has become considerably more difficult of late years,
and now requires a large aperture and fine circumstances to produce any certain indication of
duplicity. Some vigorous and moderately successful attacks have been made upon this object,
the results of which do not differ more than might reasonably be expected.
1856'59 P = 28897 E. &45 SI, on 8 m.
57'39 286-47 o' 325 M on 2 n.
57°52 289°32 o:36 SE on 4 n.
57°52 281'o6 o'5 est. DA on 1 m. with 8-in, refr. by Al. Clark,
58-58 284'oo o°33 M on 4 n.
59-36 282:58 o'45 est. DA on I n. with 73-in. refr. by Al. Clark.
59°38 29O'45 Elong. M on 3 n.
62.56 292'90 Wedged? DE on 3 n. with 74-in, refr. by Merz.
No. 2651 = 2 1998 = H I. 33 = % Scorpii, AB.
The anticipated approximation of the components of this interesting binary has come to
pass, and it is now extremely difficult for any ordinary aperture to separate them, at least in this
latitude. The orbital motion has been accelerated accordingly, and within the last 12 years
has amounted to about 1 Io9. The recent measures which I am acquainted with are but few.
//
1855-3 I P = 56.53 D = DE on 3 m. with 53-in. dialytic refr. by Plössl.
* “Oblong.” -
55°55 53-60 o°475 SE on 4 n.
56-20 65'53 o:63 est. J on 3 m. with 6'3-in. refr. at Madras.
56.33 57' 12 DE on 2 m. with 53-in. dialytic refr. “Oblong”
on I n : “Single” on 2.
56-49 7o'oz o:36 SE on 12 n. (D on 8. Z – 180°).
57. Ioé-- or single SE on 6 m. (Z — 180°).
5795 90'57 o'4 est. J on 3 m. with 6'3-in. refr. at Madras.
58. Single e - SE. “Seems elongated, but the air is bad.”
Micrometrical Measurements of Double Stars. 487
O
1863-22
64'95
65'54
//
P = . 131-14
I 52°o2
I 56'91
D = A Wedge DE on 12 m. with 73-inch refr. by Merz
(Z — 180°).
Oblong DE on 20 m. with same. (Z — 180°).
o'57 est. DA on 2 n. with 8-in, refr. by Cooke. Deeply
notched.
In Professor SECCHI's comparison of results (Catalogo di 1321 Stelle Doppie, p. 31, col. 2,
l. 3), the quotation of my measure of distance made in 1834'5, and recorded in Mem. R. A. S.
vol. xix. p. 199, should be 1", 166 instead of 1"-66.
No. 2653 = X 2032 = H I. 3 = a Coronae.
The increase both of angle and distance is satisfactorily shown by the observations of the
last 1o years; and what was once considered a difficult test for a telescope of four or five
inches aperture, is now distinctly separable with a 2-inch aperture. Since the epoch of H’s
first measures in 1780, the angle has advanced about zo;°.
1855'48
55-61
56'42
56°43
56'58
56-73
57-61
57.66
58:20
58:29
59'34.
59°39
60'36
63'og
65° 38
O
P = 18o 13
I 8o'82
181-77
182:38
182°57
181:25
183: 57
183'o&
I 83'99
183:20
184'90
185-87
185'50
190'o6
191'48
D = 2.432
2' 307
2.686
2°455
2'519
2°529
2'427
2' 527
2'569
2.665
27,o I
2’629
27 Io
2.759
3'o'78
DA on 1 m. with 73-in. refr. by Al. Clark, and
Amici D.I.M.
SE on 4 n.
DE on 6 n. with 53-in. dialytic refr. by Plössl.
SE on 2 n. -
M on 4 n. (D on 3).
J on 3 m. with 6'3-in. refr. by Terebours.
SE on 2 n.
J on 3 m. with same.
J on 3 m. with same.
DE on 8 m. with 53-in. refr.
Mo on 3 m. with Lord Wrottesley's 7#-in, refr.
M on 6 n.
DA on 2 m. with 83-in. refr. by Al. Clark, and
P.W. M. and 4-glass D.I.M.
DE on 14 m. with 73-in. refr. by Merz.
DA on 1 m. with 8-in refr. by Cooke.
No. 2657 = & Scorpii (Antares).
There seems to be very little, if any, ground for supposing that change has occurred in this
splendid, but difficult object.
acquainted with for comparison.
It may be well to bring together here all the results I am
488
Rev. W. R. DAWEs, Catalogue of
1848'oz
48-28
48°28
49'68
56-22
56.41
57: 18
58°35
64'43
P = 273°17
275°33
277°oo
276-20
273°54.
273°48
275°og
275-87
275'71
D = 3.457
3-8
3.8
3:692
3'2O5
2'997
3'4O4
3'296
3:675
DA on 5 n. with 63-in. refr. by Merz, -
W. C. B. on 1 m. by 12 obs. with 15-in, refr. at
Harvard Observatory.
G. P. B. on 1 m. by 3 obs. with same.
MA on 2 n. P. and D. by 8o obs. of each, sent to
me by Sir T. Maclear through Sir J. Herschel.
J on 3 n. (D on 2) with 6-3 refr. by Lerebours.
SE on 14 n.
J on 3 m. with same telescope, at Madras.
Mo on 4 m. with Lord Wrottesley's 7#-in. refr.
DA on 1 m. with 83-in. refr. by Al. Clark.
No. 2658 = x 2055 = H I. 83 = x Ophiuchi.
Recent observations show a steady increase both in the angle and distance of this binary
system, which has now become a comparatively easy object.
1855-58
56-o8
56'44
56'59
56-73
57.5 I
57-58
58°o9
58'12
58-62
60-36
62-93
63-57
65°49
P = 1797
14-69
I 5'56
18:23
17:55
19-88
15-67
1 5'92
1689
I9'84
19:58
1961
zo'72
25-26
D = #367
I ‘2 eSt.
I '37 I
I '37 I
I ‘292
I ‘333
I ‘29 I
I "2
I '39 I
1:270
I ‘442
1' 163
1.518
SE on 3 m.
DE on Ion. with 53-in. dialytic refr. by Plössl.
J on 6 m. with 6'3-in. refr.
SE on 2 n.
M on 3 n.
SE on 3 n.
Mo on 2 m. with Lord Wrottesley's 73-in. refr.
DE on 9 m. with 54-in. dialytic refr.
J on 3 in. with 6'3-in. refr.
M on 5 n.
DA on 1 n. (Imperfect obs. : Suddenly clouded).
DE on 12 n. (D on 5) with 73-in. refr. by Merz.
R on 1 n. with Mr. J. G. Barclay's 10-in. refr.
DE on 7 n. (D on 6) with 73-in. refr.
No. 2659 = X 2084 = H I. 36 = & Herculis.
. The progress of this highly interesting binary system has been most satisfactory, and the
disappearance of the small star from the n. f. quadrant, and reappearance in the s, p. Sll CC0SS-
fully noted. But the rapidity with which it closed up seems very remarkable; and during
that period a series of unfavourable weather for delicate observations combined with other
circumstances to prevent my obtaining satisfactory measures.
Micrometrical Measurements of Double Stars. 489
1855' 52 P = 69.71 D = *;zo SE on 3 n.
55'66 73° 19 1452 Mo on 4 m. with Lord Wrottesley's 7#-in, refr.
by Dollond. -
55.68 69'53 1595 DA on 1 n, with 74-in, refr. by Al. Clark.
56.25 66:21 1:600 J on 3 n. with 6'3-in. refr. by Lerebours.
56'52 64 18 I 2 DE on 15 n. with 53-in. dialytic refr. by Plössl.
56-53 64' I I I'41 1 SE on 6 m.
57'39 6o'o 3 I'oZ3 M on 4 n.
57-46 6o'22 1:600 Mo on 3 m. with 7#-in. refr.
57' 59 59' 49 1289 SE on 6 n.
57.86 57°oo 1-464 J on 3 m. with 6'3-in. refr.
58.25 53'43 I." I DE on 13 m. with 53-in. dialytic refr.
58.48 54'59 1'o62 SE on 2 n.
58-66 48-61 1.203 M on 7 n.
59' 39 4 I'24. I I of M on 4 n.
59°52 43'2 I o:6 est. SE on 2 n.
59-61 45'79 1.336 DA on 6 n. (D on 5) with 84-in. refr. by Al. Clark.
62'53 I '71 © wº DE on 9 m. with 73-in. refr. by Merz. “A wedge P”
63'49 342°45 ... DE on 4 n. with same. “A wedge?”
66.70 235'14 o'856 DA on 3 m. with 8-in, refr. by Cooke.
66-74 226, 25 o'945 O > on 2 m. with 15-in. refr. at Pulkowa.
66-8 I 229°22 o:829 DA on 2 days, with 8-in, refr. Daylight.
66'99 225°o8 o'984. DA on 2 days, with same. Obs. taken at noon.
No. 2666 = O > 315 = 21 Ophiuchi.
There is something very extraordinary about this object, which renders it well worthy of
close and careful attention. In O X's Pulkowa Catalogue of 1843, it is noted by its discoverer
as “fortasse duplea ea vicinissimis.” In 1845 it was observed by MÄDLER, the distance being
noted as about o'65. In 1848 I entered “D = o'-8" in my Observatory Journal. It
subsequently seemed to become almost single, and then in a few years opened out so greatly
as to render it an easy object. Yet throughout the whole of these changes the small star
continued in the same quadrant; respecting which there can be no doubt, as the mag-
nitudes are about 6 and 8. The following are all the measures I am acquainted with.
1842.60 P = 17:20 D = d'820 O > on 1 m. with 15-in, refr. by Merz at Pulkowa.
45' 5 I I 75-84 o:625 M on 6 n. (D on 5).
46.38 173.8o o'84o O X on I n. with same telescope.
47° 35 I 68-62 o:6 M on 1 n. -
57' 50 I 6o'oo tº º SE on 2 n. “Slightly elongated.”
65-60 167.62 I 334 DA on 2 m. with 8-in. refr, by Cooke.
ROYAL ASTRON, SOC. WOL. XXXV. 3 R
490 Rev. W. R. Dawes, Catalogue of
Notwithstanding the extraordinary anomalies here displayed, I feel convinced that this
must be a binary system, and hope it will meet with the attention it deserves. It is true that
the only result which is perfectly irreconcileable with the rest is Prof. SECCHI’s, in 1857;
yet it seems quite unreasonable to suppose that any mistake should have been made, when
due account is taken of the excellence of the instrument, and the great skill and care of
the observer.
No. 2668 = X 2130 = H II. 13 = p, Draconis.
This neat little binary system has been proceeding nearly at the same moderate rate
of diminution, both of the angle and the distance; and being an exceedingly easy object,
and the direction nearly vertical, the results are pretty uniform and accordant.
1856-63 P = 187:30 D = #926 DE on 4 m. with 53-in. dialytic refr. by Plössl.
57'39 186'55 2.844 M on 2 n. g
57.5 I 188:37 2-746 SE on 4 n.
58-70 187:06 3'OA7 M on 4 n.
59' 39 185°o 5 2.806 M on 4 n.
59°73 185'47 2-835 DA on 2 m. with 83-in. refr. by Al. Clark.
63'14 182'42 2-634 DE on 5 m. with 74-in. refr. by Merz.
- No. 2676 = X 2220 = H IV. 41 = 0, and (0, Herculis.
As the small companion of pi Herculis precedes it in right ascension it is properly
termed u, ; while u itself is termed u,. It has been shown by X (Pos. Med. p. ccxvii.)
that p and its companion have a common proper motion, rendering it very probable that
they are physically connected; and in 1856 the duplicity of u, was detected by Mr. ALVAN
CLARK with an object-glass of his own manufacture, having an aperture of only 7#-inches.
That this duplicity should have escaped the 9-6-inch refractor at Dorpat, and the 15-inch
at Pulkowa, employed by such keen observers as the STRUVES, makes it somewhat probable,
though by no means certain, that u, was then either single, or at least much closer than
it was in 1856. Yet it must be acknowledged that there is no proof of the distance having
increased since that date; and it may therefore not improbably be only another instance
in which the real character of a very delicate object has been overlooked ; and it is
remarkable that MADLER has measured the wide pair as lately as 1858 and 1859 without
any notice of the duplicity of the smaller. -
B + C
2.
A and
1825' 50 P = 24977 D = 29%97 S on 3 n. with 5-in. refr. at Passy.
31'60 24. I'35 29'883 X on 3 n.
36' 5 ſ 241-89 3o 167 2 on 3 m.
Micrometrical Measurements of Double Stars. '49 I
*1851.89 P = 24.2% D = 30%72 M on 1 n.
51.88 243-60 3o'290 X on I m. with 15-in. refr. at Pulkowa.
56:36 242.84. 30'294 M on 3 n. (D on 2).
59'40 24288 tº º M on 2 n.
5976 243' 17 31-356 DA on 2 m. with 83-in. refr. by Al. Clark.
66'68 243'95 31, 195 OX on 2 n. with 15-in. refr. (Communicated by letter).
This series certainly testifies to a slight increase both of the angle and the distance.
No. 2678 = A. C. 7 = p, Herculis = p, Herculis, BC.
There is no room for doubt as to the binary character of this extremely delicate little pair;
and the similarity between u Herculis with its binary companion, and u, and pſ, Boötis, is
certainly curious and striking. I am acquainted with but few results at present; but through
the kindness of Mr. OTTO STRUVE I am able to add his results recently obtained, which fully
bear out the orbital motion I had previously deduced from my own.
1857'50 P = 59°26 D = 1818 DA on 2 m. with 8-in, refr. by Al. Clark.
59'70 6o:38 2-o;4 DA on 3 m. with 84-in, refr. by Al. Clark.
64:43 77°59 I '806 DA on I n. with same.
66-68 85'oo 1. Ioo O > on 2 m. with 15-in, refr.
No. 2684 = A. C. 8.
I am unacquainted with any other measures than my own of this excessively close and
difficult object, whose duplicity was detected by Mr. ALVAN CLARK with an object-glass
of his own manufacture of only 73-inches aperture.
No. 2686 = A. C. 9.
This close and neat double star was detected by the same observer and with the same
telescope as the preceding, and it has been measured on one occasion by Prof. SECCHI.
(See Catalogo di 1321 Stelle Doppie, p. 22.)
1857-53 P = 23 °63 D = *z, DA on 2 m. with 8-in, ref. by Al. Clark.
57.85 23 I '74. I ‘og4 SE on I m. (Z + 180°).
492 - Rev. W. R. DAWEs, catalogue of
No. 2688 = 2 2272 = H II. 4 = 70 Ophiuchi.
Recent observations seem to show a pretty decided diminution of distance in these stars.
In consequence of the series of systematic differences between the observed positions and
distances and the results of computation, the late Captain JACOB has suggested the probable
existence of an invisible perturbing body (M. N. R. A. S. vol. xv. p. 229). The following
series may be useful for comparison of results.
1855'45 P = 11 *;7 D = 6°255 SE on 3 n.
55-65 I 1270 6:328 M on 5 n.
55-66 I 12-66 6'513 DA on I n, with 7#-in. refr. by Al. Clark and Amici
D. I. M. -
55-69 1 I 3-27 6'468 DA on 2 n. with same telescope and P.W. M.
56: 12 I I I'90 6'449 J on 4 n. with 6'3-in. refr. by Lerebours, at Madras.
56'50 I I I '54 6:32.0 M on 3 n.
56.55 I I I'25 6'1 25 SE on 3 n.
56-61 I I I "OO 6:3 13 J on 3 m. with 6'3-in. refr.
56.63 I I I '71 6'402 DE on 6 n. with 53-in. dialytic refr. by Plössl.
57"I 3 1 Io:62 6.460 J on 3 n. with 6'3-in. refr.
57°5 I II o'45 6-201 SE on 4 n.
57' 57 II o'o.8 6.386 DA on 1 n. with 8-in. refr. by Al. Clark and P.W. M.
57-58 I 1 o'27 6'520 DA on 2 m. with same telescope and Amici D. I. M.
57-67 11o 15 6-151 Mo on 2 m. with Lord Wrottesley's 73-in. refr. by Dollond.
58'O4. Io9'39 6'233 DE on 8 m. with 53-in. dialytic refr.
58: 12 Io9'72 6. Ioo J on 3 m. with 6'3-in. refr.
58-40 Io9'37 6-o85 Mo on 2 n. with Lord Wrottesley's 73-in. refr.
58-63 I ob'94 5°945 M on 9 n. •
59°72 Io9'33 6-243 DA on 5 n, with 84-in, refr. by Al. Clark, and Pr. Cr. M.
6o-61 I oë'27 6'oZ3 SE on 3 m.
63'o6 Io.496 5-666 DE on 18 m. with 7}-in. refr. by Merz.
65°o I Ioz'98 5'417 DE on 20 m. with same.
65.68 I oo'4. 5:31 K with 63-in. refr. by Merz and P.W. M.
No. 2698 = A. C. 15 = 99 (b) Herculis.
A beautiful and delicate object, discovered by Mr. ALVAN CLARK in my observatory
with his 83-in. refractor, which he had recently erected there. Unfortunately I am acquainted
with no other observations of it.
Micrometrical Measurements of Double Stars. 493
No. 2700 = X 2280 = H III. 41 = 100 Herculis,
I measured this neat and easy double star at the request of my late highly esteemed and
deeply lamented friend Admiral SMYTH, in order to assist in settling some point in which he
W8,S then interested.
As there appears to be no reason to suspect any relative motion, a
comparison of results may throw some light upon the habits of measuring of the different
observers.
O //
1823.46 P = 2:42 D = 14:281
3 I'72
36'52
5 o' 54.
57' 52
57-58
57°59
57-69
58'53
59'40
2'90
2-8
I-6
4’ I 5
2'53
2:38
2°5
2-83
3°4o
I 3 '847
I 4' I
I 4°o
13'956
I 4'O38
I 3 '736
I 3 '7
I4°O73
I 4'258
H and S on 1 n.
> on 6 m. (Z — 180°).
SM
SM
F
DA on 2 n. with 8-in. refr. by Al. Clark and P.W. M.
DA on 3 m. with same and Amici D. I. M.
SM
M on 2 n. (Z — 180°).
M on I n.
No. 270.5 = 2 2382 = H II. 5 = e, (4) Lyrae.
The slow retrograde orbital movement continues to be well shown by the more recent
results, while little or no variation has occurred in the distance, as will appear from the
following series.
1856:24 P = 22%2 D = 3ozo
56-49
58.43
58'47
59'40
59-60
59'73
63'09
65.85
2O"OO
1872
2O'24.
I9'5 I
1883
I 9°32
I 9°35
2O'6
3, 187
3'2O5
3' 165
2.895
3' 161
3'o62
3'o.45
2'95
The colours have usually been judged to be, A, yellow ; B, purplish.
SE on 3 m. with 9-6-in. refr. by Merz.
DE on 3 m. with 53-in. dialytic refr. by Plössl.
Mo on 3 m. with Lord Wrottesley's 7#-in. refr.
M on 6 n.
M on I n.
Mo on 2 n, with same.
DA on 1 m. with 8}-in. refr. by Al. Clark.
DE on 8 m. with 74-in. refr. by Merz.
K on 5 °n. with 63-in. refr. by Merz at Leiden, and
P.W. M.
No. 27.06 = 2 2383 = H II. 6 = e, (5) Lyrae.
This binary system also continues its retrograde movement, with no perceptible variation
Both the components are of a pure white.
of distance.
494. Rev. W. R. DAWEs, Catalogue of
1856'o6 P = 14840 D = 2';76 SE on 4 n. -
56-46 I 47' 5o 2.686 DE on 2 n. with 53-in. dialytic refr.
58'42 146.67 2'476 Mo on 3 m. with Lord Wrottesley's 73-in. refr.
58’47 146-27 2-651 M on 6 n.
59°4o I44'54 2°206 M on I n.
59'73 I 45'81 2'547 DA on 1 m. with 83-in. refr. by Al. Clark.
63°og I 43'97 2'479 DE on 8 m. with 73-in, refr. by Merz.
65.75 I 43°4. 2:35 K on 5 2 n. with 63-in. refr. by Merz, and
4-glass D.I.M.
65.75 144'86 2:556 DA on I n. with 8-in. refr. by Cooke, and
4-glass D.I. M.
65.85 142.6 2:35 K on 5 °n. with same 63-in. refr. and P.W. M.
No. 2708 = D 9 = L 35816.
An exquisitely delicate object, of which I am acquainted with no other measures than my
OWI),
No. 2714 = 2 2523 = H III, 57.
There is no evidence of change either in position or distance since the duplicity of this star
was detected by H, as the following selection of results will prove.
1783.20 P = 14860 T) = 7%z H
1823: 53 I 53'26 s 6'938 S on I n, with 33-in. refr.
3o'96 I 5 I ‘54. 6.214 X on 5 m.
59'74 I 5 o'65 6'462 DA on I n, with 84-in, refr. by Al. Clark.
No. 2715 = 2 2545 = H I. 13 = S 720 = P XIX. 186.
An elegant triple star discovered by H in 1781, who describes it thus: “The two nearest
very unequal: the third star excessively small, and not visible with 227. The two nearest
with 460 no more than 3 diameter of L ; the farthest about 7" or 8".” Being thus distinctly
described, the third star was carefully looked for by South on a night “very favourable for
difficult observations,” with his 7-foot refractor of 5-inches aperture; and he says, “I applied
a power of 413, but no third star could be even suspected.” (See Phil. Trans. for 1826,
part I. p. 233). With the same telescope it was measured as double on three nights in 1828
by Sir JoHN HERSCHEL, who in a note says, “This is S. 720. It cannot be H I. 13.” Why,
is not said ; but probably because no third star could be found either by SouTH or himself.
In the years 1825, 1828, 1831, and 1833, STRUve measured it on 5 nights ; on one of which
Micrometrical Measurements of Double Stars. 495
he used power 320 (actually 254), on three 480 (420), and on one 6oo (532); and being aware
that H had described it as triple, he carefully examined his No. 2541, and also this star (his
No. 25.45) for a third star, but without success. He inclined, however, to No. 2541 (P. XIX.
185), as being identical with H. I. 13. Subsequently, Admiral SMYTH examined both P XIx.
185 and 186, and has entered his observations under No. 702 and No. 703 of his Celestial
Cycle. Yet he saw no third star in P XIx. 186; and having found in the neighbourhood a
triple star, he came to the conclusion that it must be the triple star H I. 13. But by com-
parison of the declination of SM 702 with that of S 720, it is clear that they are not identical,
the difference amounting to 16': whereas the declination of SM 703, is almost precisely the
same as that of S 720. Hence, notwithstanding the extraordinary fact that the third star of
H I. 13, discovered with a 63-in. reflector, was not again seen by any of the observers who
searched for it with far more powerful instruments during the interval of 78 years, there can
be no doubt that H I. 13, is identical with 2 2545, S 720, SM 703, and H 553-555 of 364;
and the comparison of the results obtained by different observers, will assist in establishing
their identity. •.
//
1782.77 P = 30725 D = ... H. “With 460, no more than } diam. of L.”
1802-76 3I4°75 ... H
25'59 3.16°o 5 4'488 S on 4 m. with 5-in. refr. at Passy. “A = 8% ;
B = 1 13.”
29' I I 3 I 5' 18 3: 532 > on 5 m. “A = 6.2, alba : B = 8. I caerulea.”
3O'69 3 I 6'o; 5'403 H on 2 m. with 5-in. refr. “A = 6; ; B = 10.”
35' 58 3 I 5’7 3.8 SM. “A, 73, pale white; B, 9, sky-blue.”
46°oq. 3 17'o6 3' 35 J on 2 n. (D on 1) with 3.8-in. refr. by
Dollond, at Poona.
56-90 3 I 749 3'567 SE on 3 n. (No notice of the third star.)
59'8o 3 I 5’-E 3’-E DA on I m. a rough estimation with 84-in. refr.
when the third star was re-discovered.
62-68 3 19° 30 3'643 DA on I n. with 83-in. ref. A = 6%, white;
B=8%, blue. A & C, P= 172°3; D=2.5"--.
It is certainly a very remarkable fact that even SECCHI, in the pure air of Italy, with the
star 1 o’ higher than in these latitudes, and using a fine refractor of the same size as that at
Dorpat (9.6%inches in aperture), should also have failed to notice the third star ; unless indeed,
presuming that the object was only double, he observed it in an illuminated field only. Having
observed it on many occasions since the re-discovery of the third star on the 21st of October,
1859, I have no evidence from my own observations of its being variable in brightness. (See
Mon. Not. R. A. S. for Nov. 1862.) Neither the great differences in the estimations of the
magnitudes, nor the enormous discrepancies in the measured distances in the earlier results,
materially interfere with the proof of identity ; for nearly as large have occurred in far easier
stars which were much better situated. And the fact that in 2 2547, even STRUVE himself
overlooked the third star, of which SMYTH says, “It is plain enough in my refractor,” proves
that the much smaller star in X 2.545 might easily have been missed. That SMYTH under
496 - Rev. W. R. DAWEs, Catalogue of
No. 702 of the Cycle was referring to X 2547 (though he thought he had H. I. 13 in the field),
is evident from his statement, that “the three lie nearly in a line pointing to a distant Small
star in the s. f. quadrant.” It is true that his estimations of the distances of the stars com-
posing 2 2547, are very far from correct ; but it seems highly probable, that by some means,
his observations of > 2541 and > 2547 got mingled together ; an accident the more likely as
they differ but little in declination. The existence of three close double stars within a small
space, in all of which the smaller component has nearly the same relative position, has caused a
degree of confusion which has no parallel in any other case. 2 2545 is L 37207.
No. 2716 = D 13 = L 37672.
This delicate and elegant object was detected by myself 1859, Oct. 5, with ALVAN
CLARK's 8%-in, refractor. I am not acquainted with any other observations of it than
my own.
No. 2717 = 2, 2579 = H I. 94 = 3 Cygni.
The continued retrograde movement of this beautiful binary is well shown by the more
recent measures, while the distance has scarcely if at all varied.
1855.74 P = o°o D = 1°27 5 Mo on 3 m. with Lord Wrottesley's 73-in. refr. by Dollond.
56'84 3'27 I'413 SE on 6 n.
59'58. 357'72 I-675 DA on 3 m. with 83-in. refr. by Al. Clark.
62:23 354' 55 1:640 O > on 2 n. with 15-in. refr. (Communicated by Herr
- C. Behrmann.)
63'27 355 °43 I 583 DE on 12 n. with 73-in. refr. by Merz.
65°oz 35o'76 I 578 DE on 18 m. with same.
65.38 349-62 I-675 DA on 2 n. with 8-in. refr. by Cooke.
65'44 34.9°oo 1705 KN, with 73-in. refr. by Al. Clark.
The first in the above series is undoubtedly very far (nearly 6°) from the most probable
angle at that epoch, and about — o”35 in distance. The rest, considering the difficulty
of the object, arising from the closeness and great difference of brightness of the components,
are fairly accordant.
No. 2722 = D 10.
A very close double star in Vulpecula, which however would very probably have been
separated with the Dorpat refractor, certainly with the 15-inch at Pulkowa, if it had
formerly been no closer than it is now. I discovered it in Sweeping, on a night not very
Micrometrical Measurements of Double Stars. 497
fine, with my 8%-inch refractor by ALVAN CLARK, and power 3oo. I am not aware of any
other measures of it than my own. It is not too small an object to be admitted into
the Catalogues of Dorpat and Pulkowa ;—not being less than the eighth magnitude, as
determined by my plan of gauging by apertures according to the scale adopted by STRUvE.
No. 2723 = 2 2583 = H I. 92 = 7 Aquilae.
Notwithstanding considerable discrepancies in the recorded measures of this close and
pretty double star, there seems no sufficient reason to suspect change either in position
or distance. No doubt the obliquity of the position has contributed to increase the dif-
ferences in the results. The comparison of a few of these may be interesting.
1825-61 P = 12345 D = #549 S on 7 n. (D on 4).
29.96 I 20.75 I'5oz > on 6 m.
3o'82 12177 I 582 B on 5 n. with the Königsberg heliometer by
Fraunhofer.
32°56 I 27°40 I-680 H on 1 n. with 5-in. refr. by Tulley.
36.81 12 I'3 1.7 SM
42'72 123' 17 I'47.4 M on 2 n.
55.87 1 18:36 I 359 SE on 7 n.
58-66 I 20.82 1492 Mo on 2 n. with Lord Wrottesley's 73-in. refr. by
Dollond.
61-73 Io8'94 1:27 MAIN on I n. with the Oxford heliometer by Merz.
65-67 I 2 I I 3 I'454 KN on 4 n. with 7}-in. refr. by Al. Clark.
65’74 I 20.8o 1-630 DA on I n. with 8-in. refr. by Cooke.
65.84 1 17:6 I'34 K on 5 ºn, with 63-in. refr. at Leiden, by Merz,
t and P.W. M.
The difference between the angle obtained by Mr. MAIN with the Oxford heliometer and
all the measures is so great that I entertained a suspicion of a misprint ; which, however,
was dispelled by reducing the observation. Compared with BESSEL’s measure with the
Königsberg heliometer, the difference amounts to 12°83! The distance, too, is smaller by
o'-31 than that obtained by BESSEL.
No. 2725 = A. C. 16.
Of this excessively close double star, detected by Mr. ALVAN CLARK in 1858, I know of
mo other observations than my own.
ROYAL ASTRON, SOC. WOL. XXXV. 3 S
498 - Rev. W. R. DAWEs, Catalogue of
No. 2726 = A. C. 17 = Cygni 153 (B).
The delicate companion to this star was detected by Mr. ALVAN CLARK in my Observatory
on 1859, July 19. Besides my own I am unacquainted with any other observations. This
object is B. A. C. 6959.
No. 2727 = A. C. 18 = 44 Cygni.
An exquisitely delicate and beautiful object, discovered by Mr. ALVAN Clark in my
Observatory on 1859, July 6. I know of no other measures of it.
No. 2729 = 2 2727 = H III. Io = 'y Delphini.
Though there is no evidence of variation either in the position or distance of the com-
ponents of this fine double star, yet it may be interesting to bring together the results of
different observers, as throwing some light on their habits of measuring an easy star.
*-
1823.68 P = 273.72 D = 14317 H and S on 1 m. with 33-in. refr.
3o'89 272-88 12°o 16 B on 7 m. with the Königsberg heliometer.
3o'89 273-76 I I'904 2 on 5 m.
3 I 59 273'36 12'o'74 DA on 3 n. (D on 2) with 3-8-in, refr. by Dollond.
31-60 273 6 I 2 * I SM with 5.9-in. refr. by Tulley.
32°57 273' 19 12'o;5 H on 2 m. with 5-in. refr. by Tulley.
34°52 273'4 12-3 SM
39'71 273'3 II '8 SM
41-62 273°45 I I'47.5 M on 4 n.
47°97 272'5o I 1:47.0 M on 2 n.
5o'75 273.81 I I'342 M on 3 m.
56'51 272.38 I 1.281 Mo on 2 m. with Lord Wrottesley's 73-in. refr.
by Dollond.
56-74 272'63 1 I-68; SE on 7 m.
58.23 27 I 35 11:421 DE on 3 m. with 53-in. dialytic refr. by Plössl.
59°o 5 272'oZ 11623 DA on 4 n. with 7; and 84-in. refr. by Alvan
Clark and D. I. M.
No. 27.33 = O > 413 = A Cygni.
The retrograde movement in the position of this close double star continues so as satis-
factorily to prove its binary character.
Though the discrepancies in the measures of position
Micrometrical Measurements of Double Stars. . 499
near the same epochs are considerable, yet the great difficulty of the object might account
for even greater. The distance appears to have scarcely varied since the first observations
of its discoverer, who has kindly sent me all his observations of this object and of several
others for comparison with my own.
1856.83
58-64
59'73
6o-8 I
61-63
O
P = IoI'5o
94 37
99'58
96'51
93-io
92° 5 I
D = o'7
//
SE on I n.
o:693 O > on 3 n: with 15-in. refr. at Pulkowa,
o'61 o SE on 2 m.
o°717 DA on 1 m. with 83-in. refr. by Al. Clark.
o'67 o O > on 2 n. -
66'99
o:686 DA on 1 m. with 8-in, refr. by Cooke.
No. 2735 = > 2737 = 1 (a) Equulei, A. B.
The difficulty attending the measurement of this object renders it doubtful whether any
perceptible change has taken place within the last ten years.
1855-88
56'42
- ‘58-83
59.67
62-64
63-85
65.68
O
P = 287:44
290.80
292' I 4
285'59
283-87
285 17
288’o8
D = &819 SE on 5 m.
o'831 M on 3 n. -
o’95o M on 4 n. (D on 2).
1-043 DA on 1 m. with 84-in, refr. by Al Clark.
o'6 DE on 4 m. with 74-in, refr. by Merz.
o'865 DA on 1 m. with 83-in. refr.
1 oz.5 KN on 4 m. with 73-in, refr. by Al. Clark.
No. 2737 = X 2742 = 2 (A) Equulei.
There seems to be no evidence of change in this neat and easy double star, detected by
STRUVE. A few epochs will suffice for comparison.
1831'57.
33'72
42°74
56-78
59°74
65.72.
O
P = 22470
225-6
226: I 3
225'35
224'o6
224-65
D = #580 X on 3 n.
- 2-6 SM
2:55 1 M on 3 m.
2.798 SE on 2 n.
2:569 DA on I n. with 84-in. refr. by Al. Clark.
2.601 KN on 2 m. with 73-in, refr. by. Al. Clark.
No. 2738 = O > 431.
There seems to be no relative motion in the components of this neat little double star.
It was detected by, OX, and it is rather surprising that it should have been previously
overlooked.
5 OO Rev. W. R. DAWEs, Catalogue of
1845'o2 P = 11757 D = 3%07 O > on 3 m. “A = 7.7; B = 8-o.”
59'88 I I 8: Io 3.390 DA on 1 n, with 8%-in, refr, by Alvan Clark.
- A = 8 ; B = 8}. &
No. 2739 = O > 432 = P XXI, 50.
There is some probability of a small retrograde movement since the first measures of
the discoverer, with which he has favoured me by letter.
O //
1842-66 P = I 36-60 D = I 18o O > on I n.
45-69 I 3 o'oo I I 5 o O > on I n.
51 7 I 127.60 I 23 o O 2 on 2 n.
59'68 126-41 1'o27 DA on 1 m. with 84-in, refr. by Al. Clark.
No. 2740 = A. C. 19 = A Z XXIV. I 1.
This pretty double star, discovered by Mr. ALVAN CLARK in my Observatory in 1859,
is now so easy and, from the nearly equal magnitude of the components, so conspicuous
an object, that it appeared to me surprising that it had not been detected either at Dorpat
or Pulkowa. But on mentioning it to Mr. OTTO STRUVE when he was in England in
1860, he informed me that having referred to fle record of his observations made while
sweeping for the objects in the Pulkowa Catalogue, he found it repeatedly noted as single.
Hence, if there is no error of identity, it must have rapidly separated in the interval, and
may now perhaps have arrived nearly at its maximum distance ; the plane of the orbit
lying nearly in the line of sight. I am unacquainted with any other measures of it than
my own.
No. 2745 = H II. 62 = O 2443.
If the measure of position of this object by its discoverer in 1782 is sufficiently correct
(though termed by him, “perhaps a little inaccurate”), there is reason to suspect a slow
retrograde movement, as O X has mentioned in his note on No. 443 of the second edition
of his Pulkowa Catalogue. It may therefore be worthy of further attention. We have
for comparison, - - - -
A/
1782.76 P = 35340 D = ... H. “With 227, about 3 diameters of S.”
1845-67 35o'o'7 8’ loo M on 1 m. (Z +180°).
47: I 9 348-77 8, 183 O > on 3 n.
51.71 - 3.48° 5o 8. I of M on I n. 2
59-65 348-62 8.32 I DA on 1 m. with 84-in. refr, by Al. Clark.
Micrometrical Measurements of Double Stars. - 5O I
No. 2746 = D is = L 42240–1.
A very delicate and elegant double star, discovered by me in 1859 while sweeping with
the 8%-in, refractor by ALVAN CLARK. A = 7%, pale yellow; B = I I, lilac. I am not
aware of any other measures than my own.
No. 2750 = A. C. 20 = 75 Cygni.
An extremely elegant double star, discovered by Mr. ALVAN CLARK in my Observatory in
1859. A = 5%, deep yellow ; B = I I ; bears good illumination. Of this object I am not
acquainted with any other observations than my own.
No. 2753 = 2 2822 = H III. 15 = u Cygni.
Recent measures of this beautiful object confirm the relative fixity of the components.
1855-62 P = 1.16%| D = 4859 DE on 17 n. with 53-in. dialytic refr. by Plössl.
56.94 1 1676 4:633 SE on 3 n.
57.83 1 1576 4'22O M on 5 n.
59'74 115-67 4:72-E DA on 1 m. with 83-in. refr. by A. Clark and Pr.
Cr. M. with BARLow-lens. Scale of distance
rather uncertain.
62.98 I 16:40 4'407 DE on 6 m. with 74-in, refr. by Merz.
No. 2754 = O > 452.
Of this close double star I have lately received the measures of Mr. Otto STRUve, who
discovered it. We have therefore for comparison,--
1847:46 P = 17513 D = 1487 O X on 3 n.
5 I-71 183'97 I 199 M on 1 n.
59-69 182-65 I 189 DA on 1 m. with 83-in. refr. by Al. Clark.
No. 2755 = 2, 2909 = H II. 7 = & Aquarii.
The distance between the components of this interesting binary may have slightly dimi-
mished; while the retrograde orbital movement has steadily proceeded.
502 Rev. W. R. DAWEs, Catalogue, &c.
1855.77 P = 34; 19 D = #468 SE on 3 n.
55.78 343-33 3'474 M on 2 n. -
55'83 345'95 3'575 Mo on 3 m. with Lord Wrottesley's 73-in. refr.
56'32 343°35 3'597 - DE on 1 on. with 53-in. dialytic refr.
56.76 343 of 3.319 SE on 2 n. -
56'79 344-44 3.890 M on 3 n. (D on 2).
57.87 342'27 3.277 J on 3 n. with 6'3-in. refr.
58°ol 343'85 3:647 M on 3 n.
58: 15 34. I'52 3'567 DE on 9 m. with 53-in. dialytic refr.
58.8o 342'24. 3'508 M on 4 n. -
59-69 34O'33 3.438 DA on 4 m. with 84-in. refr. by Al. Clark.
62'91 339°25 . 3, 180 R on 3 n. with Mr. Barclay's Io-in. refr. by Cooke.
63' 14 339'O4 3’522 DE on 15 n. with 73-in. refr. by Merz.
66'99 336°33 3.326 DA on 1 m. with 8-in. refr. by Cooke.
No. 2761 = 2, 2912 = 37 Pegasi.
The published measurements of this difficult object seem to have been very few within the
last twelve years; and they are not sufficiently trustworthy to decide the question of its binarity.
All I am acquainted with are the following. -
1857°og P = 11%;6 D = o”43 SE on 4 n.
57’ I 5 - 125'63 o:6 est M. on 4 m.
57.87 1 16-27 o:7 est. J on 2 n. with 6'3-in, refr. by Lerebours.
60-70 I 1983 DA on I n, with 84-in, refr. by Al. Clark.
No. 2762 = 2 3,062 = H I. 39 = B.A. C. 8372.
The increase both of the angle and the distance is satisfactorily shown by the more recent
observations of this interesting binary system, as will appear from the following comparison.
1855'91 P = 24% 5 D = { 328 Mo on 3 m. with Lord Wrottesley's 73-in. refr. by , Ž, * , ,
56°oo 249'66 12 est. DE on I 1 m. with 53-in. dialytic refr. by Plössl. e-rrest ºf .
57'99 252'29 1:2 est. DE on 6 m. with same. 7% A*/ t
63'25 264.68 1.437 DE on zon, with 74-in. refr. by Merz.
63-86 265-61 I 396 DA on 1 n. with 83-in. refr. by Al. Clark.
65. 18 269.84 1' 376 DE on 13 m. with 74-in. refr.
65'71 26995 I'432 KN on 3 m. with 74-in, refr. by Al. Clark.
NotE.—In the tabular portion of the APPENDIx, the letters D.I. in the column headed
“Micrometer,” and in the Notes, D. I. M., are abbreviations denoting “Double-Image
Micrometer.”
*, ,
2- ill
|ſilii
RSITY O
CH
3 9015 08659
3277
2
**- ------ -