Observations of the Apparent Distances & Positions of 380 Double & Triple Stars, Made in the Years 1821, 1822, & 1823, & Compared with Those of Other Astronomers; Also a Description of a Five-Feet Equaltorial Instrument Employed in the Observations (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1825 Excerpt: ...67. 5 71. o 70. o 12 Canum Venaticorum continued. Mean result. Position 430 -' sp; Distance 19."764; 1822.23. Other observations, Pos 41 4/ sp; 1782.30; Dist. 20." o; H. Cat. of 1782. 46 27 sp; 1819.66; 19.87; Str. Addi. &c. p.186. 1821.67; 19"-94; Struve, Astron. Na chrichten, No. 22. This fine double star appears therefore to have undergone no change whatever. No. CLIX. R. A. 12h 48"; Decl. 550 1' N. Struve, 430; 8th and 10th magnitudes; large, white; small, blue decidedly; it is a miniature of - Bootis, and is at least as difficult of measurement; no advantage is gained by using a higher magnifying power than we generally employ, which is 133. May 7, 1823. Five-feet Equatorial. np Position = 10 19' np Distance = 3."622. Distance. Parts. 10. 81 11. 7 12. 6 10. 8 12. 5 "-7. 79-45 79-35J Mean--79.41 Mean = 11.68 Z =--0.21 Quite as difficult, if not more so, than Bootis. H. Mean result. Position 15015' np; Distance 4, ." 136; Epoch 182343. No. CLX. R. A. 1$k 1ra; Decl. 4 34' S. 6 Virginis; Struve, 432; III. 50; Triple; the small close star is a very severe test for a telescope; it bears a strong illumination, however, though exceedingly faint, and is even better seen for it. The distant star does not bear illumination, on which account no measures of distance could be procured. Mean _ 65.57 Position = 24 3' np. Other measures. Position of AB 6g 18' np; Distance 7." 13; 1782.99; H. 2d Cat. 71 10 np; 1802.31; Ditto.MS. No. CLXI. R. A. 1sh 4m; Decl. if 5 N. 54 Virginis; Struve, 433; II. 45; Nearly equal; 7th and 74 magnitudes. April 9, 1823. Five-feet Equatorial. nf Position. o Distance. Parts. 23. o-j 21. o 23. 2 22. 8 21. 4J 20. o' 21. 3 22. 2 22. O 22. 5_ 1783.18. Position 570 o' nf; Interval i or 1$...