Mr ROTHMAN'S OBSERVATIONS OF HALLEYS COMET. 



495 



The Star of comparison is x Aurigje. Its rR has been taken from 

 Airy's Camhr'idge Observations for 1830, p. 103; its declination from 

 Piazzi, VI. 98. 



Inner Ring. 



Both in the same half 



of the field ; 

 Comet above throughout. 



The Star of comparison is Histoire Celeste, 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 M. from the mean of the rest, and where clearly the small star had 

 been taken by mistake, has been altogether set aside, arid does not 

 appear. 



I have been unable to find this Star either in tiie Histoire Celeste 

 or Bessel's Zones. 



