224 Royal Astronomical Society. 



when reduced gave as follows, (calling a and 8 the right ascension 

 and declination of Auriga, and a' 8' those of the comet): 



By the first comparison... «'«=**- 8 m 4" J' = I — 53' 30" 



second «' = « — 9 9 J' «= 3 — 59 



third a' r. « — 7 51 V = $ - 55 48 



The sidereal times of observation (corrected for the clock's error) 

 being respectively 3 h 53 m 41 s *5, 4" 32™ 40»\ r >, 4 h 5\ m 36»'5. The 

 second of these results must evidently be rejected for the reason 

 above mentioned j whence the mean of the two others gives, for 

 4 h 25™ 29 s, 5 sid. time, 



a! = « _ 7 m sr-5 y = J - 54' 39".* 



" At 4 h 5 l m 36 s, 5, sra\ time, the comet was compared with a small 

 double star, whose approximate place for .1830*0 was found, by com- 

 parison with 6 Auriga, to be 



JR 5 h 40 m 54 s -5 ; Dccl. + 36° 13' 31". 

 The stars composing this double star are about the 8th and 9th mag- 

 nitudes ; their distance, roughly taken, about 65 parts of the micro- 

 meter = 15"j and their angle of position 13° 20'*/'= 103° 20'. 

 This description will enable any observer easily to identify and re- 

 observe the double star in question. The comet, at the time above 

 stated, preceded the double star 38 seconds of time, and was found, 

 by a micrometric estimation (for I cannot call it a measure),^to be 

 about 550 parts = 2' 12" North of it. 



"On the next night, I again observed the comet with the 20-feet 

 reflector, and again found it without the least difficulty. It was very 

 little, if at all, perceptibly brighter or larger than the preceding night j 

 but had entirely deserted its former place, and was now near a single, 

 pretty bright star, of fully the 10th magnitude, insulated in the field, 

 and easily identifiable. The approximate place of this star for 18300 

 I found, by comparison with by the equatorial, to be ^R5 h 45 m 18 s -0j 

 Decl. + 36° 13' 31". 



" I procured, through the intervention of this star, two indirect 

 comparisons of the comet with Auriga ; in both of which I was, 

 however, obliged to estimatethe difference of declinations of the comet 

 and star at 2', by reason of the excessive feebleness of the former, 

 which rendered all measurement impracticable. I also compared it 

 twice directly with ; but of these comparisons, one, when reduced, 

 proved to have been an illusion of the kind above mentioned j I there- 

 fore suppress its result. Those of the others were as follow: — 



Bv intervention of] j, m s m i , ,, 



'the small star. U = 2 1 4 sid. time; *! = a — 2 28-5 ; V = 2 - 1 O 



1st comparison J 



By ditto, 2nd ditto t = 3 J 4 a' = « - 2 14-5 ; * = 3 - 1 O 



By direct compa-1 2 jjq 4g *' = * - 2 25*0; 3' = 3 - 1 1 



nson with 6 ... J 



Mean t = 2 30 58 a' = a - 2 23-5; V s= 3 ~ 1 20 



* The mean place of 6 Aurigtr, brought up to Jan. 1, 1832, by the precession 

 assigned in the Astronomical Society's Catalogue, is 



JR 5* 48 m 15* -6; Decl. + 37° IJ' 33". 



