The Star of comparison is ≈ Auriga. Its A has been taken from Airy's Cambridge Observations for 1830, p. 103; its declination from Piazzi, vi. 98. The Star of comparison is Histoire Céleste, p. 212, Mars. 5. the first star and also p. 273, Mars. 13. the first star. The Comet to-night was faint, and appeared to have diminished in size since first seen. I was perplexed during the observations by a singular circumstance: a small star was so close to the brightest part of the nucleus, as to make it uncertain which point to observe. Owing to this cause, one observation, which on being reduced differed 10 in RR from the mean of the rest, and where clearly the small star had been taken by mistake, has been altogether set aside, and does not appear. I have been unable to find this Star either in the Histoire Céleste or Bessel's Zones. The Star (b) is 61 Auriga. Piazzi, vi. 252. Unfortunately, I have been unable to find the Star (a) in the Catalogues. One observation of the outer ring rejected, under circumstances The Star is 58 Telescopii Herschel. Position for 1810 according to Groombridge, AR = 7h.7.30,5. N.P.D. 44°.26'.52". The Comet to-night was extremely faint, and the instants of appearance and disappearance are little better than estimations. the disappearance of the Comet may be marked a little too soon. One observation marked as doubtful in my journal jected, though it agrees pretty well on being reduced. Piazzi, VIII. 15. has been re The Star is Several comparisons were made with the outer ring this evening, before the Comet approached sufficiently near the Star to admit of the use of the inner ring. These have been rejected for reasons already explained. The Star is in Groombridge AR 10. 48. 58,14 h. m. 8. = } for 1810. Two observations have been excluded: one because the Star's entry was marked somewhat too late; the other, because the telescope received a slight blow during the observation which may have displaced it. Both of these on being reduced agree well, but I have thought it safer to reject them. The Star is in the Mémoires de l'Académie for 1790, p. 383, A. Transit at 12h.39.35,0. The Star is in Histoire Céleste, p. 83, there called, but erroneously, 46 Herculis. |