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h. on. s.
Watch fast 3". 36.
The Star is in the Histoire Céleste, p. 52, March 4, 1794, observed
These are the first observations I ever made with the ring-micro
I imagined at first the Comet too far from the Star to be compared by means of the inner ring, and accordingly made one observation with
the outer ring.
practicable, I proceeded to make them:
Finding however measurements with the inner ring
always preferring to do so
when possible, as more dependence can be placed on the perfect circu
larity of the latter. ring has been rejected.
For this reason the single observation of the outer The Star of comparison is & Aurigae. Its R 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 AR 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.
h. m. s. | Inner Ring.
Comet 25. 7,0 26. 56,8 Comet in the upper.
I have been unable to find this Star either in the Histoire Céleste or Bessel’s Zones.
The Star (b) is 61 Aurigae. 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 similar to those of Sept. 30.
The Star is in Histoire Céleste, p. 208. A. Transit at 6". 49". 48,5.
The Star is 58 Telescopii Herschel. Position for 1810 according to Groombridge, AR = 7".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.
They entered quite simultaneously. Tolerably good observation: the disappearance of the Comet may be marked a little too soon.
One observation marked as doubtful in my journal has been re
jected, though it agrees pretty well on being reduced.
Piazzi, VIII. 15.
The Star is
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. explained.
These have been rejected for reasons already
The Star is in Groombridge AR = 10.48. o for 1810.
on. Star 12. 5. 40,8 6. 51,6
Egress. h. m. s. Inner Ring. 12. 9. : Star in the upper half: 12. 20,8 Comet in the lower.