(o UASS UC-NRLF 335 S h ,, -f STANDAR MEAN RIGHT-ASCEISIOIS OF CIRCUMPOLAR AND TIME STARS, PREPARED FOR THE USE OF THE kjU U, S, COAST SURVEY. 1 A. D. BACHE, SUPERINTENDENT. WASHINGTON: GOVERNMENT PRINTING OFFICE. 1862. / UNITED STATES COA.ST SUB VET. (862 WASHINGTON, September 13, 1862. The accompanying determinations of star-places Lave been made by Dr. Gould for the use of the telegraph longitude parties of the United States Coast Survey, especially in determining time and instrumental corrections. Their careful and thorough preparation, which is the fruit of many years' labor in the examination and employment of all existing observations available for the purpose, seems to entitle them to the name of "Standard Right- Ascensions," and these final results are now put in printed form, for a more convenient distribution among the parties of the survey and astronomers generally, than the manuscript form in which they have hitherto been circulated. A. D. BACHE, Superintendent ^U, S. Coast Survey. 623 UNITED STATES COAST SURVEY. CAMBRIDGE, September 10, 1862. SIR : A list of Mean Places of 48 Circmnpolar Stars thirty-six of them being those used by STRUVE in his chronometric expedition between Altona and Greenwich, and four others being the " polar stars, " generally so called was prepared for the use of the Coast Survey by me and the party under my charge in 1854, and first printed in the Superintendent's Annual Report for 1855. A year later it was reprinted with corrections, and during the year 1857 was improved as far as possible with special reference to its employment at the Dudley Observatory, in Albany. The method of its formation was described in some detail in the sixth volume of the Astronomical Journal. At the same time, and for the same purpose, a similar redetermination was made of the right-ascensions of 132 other fundamental stars, favorably situated for use with the circumpolars in determining time and azimuth. This has been known as the "Time Star List," and, although never printed in its completed form, has always been at the service of astronomers in this country. The work of collecting new observations and including them in the investigation has been continued, and during the year ending July, 1861, entirely new determinations were made of the corrections needed for reducing the right-ascensions as given in the principal catalogues, and in the several annual volumes of observations at Greenwich, Edinburgh, and Oxford, to the equinoctial points of the catalogue which I had selected as the fundamental one, viz : ARGELANDER' s DLX Slellarum Positiones Mediae. During the summer of 1861 these new values were employed for yet another redetermination of the right ascensions and proper motions of 172 stars out of the 180; and all known observations and catalogue places since the time of BRADLEY, which seemed capable of adding to the accuracy of the results, were combined according to the method of least squares. No labor was spared which promised a return, not even the search for and reduction of crude observations scattered through the sundry volumes of unsystematic and disconnected observations at minor observatories. The small corrections for reducing to the zero of ARGELANDER have been determined : 1st, by collation of all the right-ascensions common to his Posit. Med. and to the authority in question ; and, 2d, when the number of stars common to both has proved inadequate, by a similar comparison with some catalogue for which the "reduction to ARGELANDER" is well determined. Examination has always been made for terms which are in any way functions of the declination or right-ascension, as well as for those which are constant. To the mean places, proper motions, and processional coefficients, have been added the constants for reducing from mean to apparent places, together with their annual variations. These variations do not hold strictly for 1855.0, but are the average values for the following decade, having been obtained by computing the logarithms for 1855 and 1865, and dividing their difference by ten. They have been computed also by the differential formulas, for 1855.0; but as these determinations excluded the proper motions and the change in the processional constants, they have been used only as a control, and the former values retained a's more convenient. Throughout these computations the Pulkowa constants of precession and nutation have been employed. The stars Sirius, Castor, Procyon, and 61 1 Cygni, originally numbered 35, 39, 40, 115, are so ill-suited for the determination of time, owing to their magnitude, variability of proper motion, or orbital revolution, that they are now omitted from the Time-Star List, though without changing the numerical notation. All the important details and incidental results of these investigations are prepared in proper form for the forthcoming "Records and Results of the United States Coast Survey;" but since the resultant values have been for some time adopted as standards of right-ascension by the Washington Observatory and the American Nautical Almanac, as well as in the Coast Survey parties and office, and since constant applications as well as various other reasons render the increase of copies desirable, I respectfully suggest that the results be put in type in advance of the long-deferred publication of the volume. The table of mean declinations for the circumpolar stars is from the Astronomical Journal No. 130, with a slight change in the arrangement. Very respectfully, yours, B. A. GOULD. Prof. A. D. BACHE, Superintendent V. S. Coast Survey. UNITED STATES COAST SURVEY. o ^(WCO^iO 01-000-0 ^H^CO^vo I- 00 rH CM CO ^ LO CO t- 00 i-< M etf <+ IQ CO CO n CO O CO CO * CM TJI C7 'Jl -* lO ^* * o t~ co t-4 (M . CO CO CO CO CO be o _*r *** 2 ^ 2 * ^ "^ r- * to O GO CO T-H T-H LO (> CO -H* t CO ?*J t*- CO CO -^ t- CM O CO CO ^ LO LO Cl GO t-. CO 00 t- CO ^ CO CO uo o -* co oo oo o co "* d -* t"- cv i> o GO o w& *G H ^ H c: t-- t>- co o O 00 ** I-H l>- 1 Ci -* SO LO O O i f O t* -H O O O d OJ LO O rH r- i (M Tft t> ** CO *O >O CO i 1 O SO rH t O O ** >O (M CO O CO Cl CM -3< t- -^ C; CO CO CO 7>? 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