186 



Mr. Walker read a paper, entitled, "Observations of Encke's 

 Comet in March and April, 1842, at the High School Observa- 

 tory, with the 9 feet Fraunhofer Equatorial, by Sears C. Walker 

 and E. Otis Kendall;" which was referred to a Committee. 



The true right ascensions and declinations of the stars of compari- 

 son, on the evenings of observation, are stated in the paper as follows : 



a = l 46 11.18, 



a' 



= 



+ 16 46 26.04, 



#9 



Mag., 



Bessel's Zone, No 



.394. 



„ 1 46 11.28, 



>} 





16 46 31.26, 



9 



)> 



Lalande H. C, p. 



192. 



b = 1 46 10.55, 



V 



= 



16 41 24.72, 



9 



d 



Bessel's Zone, No 



.394. 



c = 1 49 25.88, 



c' 



= 



16 46 1.69, 



8 



,, 







„ 1 49 25.51, 



ii 





16 46 8 32, 



8.9 



n 



Lalande, H. C, p. 



192. 



d = 1 49 41.70, 



d! 



= 



16 52 32.70, 



10 



n 



Anonym. Approx. 





/ = 2 1 4.60, 



f 



= 



17 15 12.90, 



10 



11 



;> >> 





£•=1 59 6.71, 



g' 



= 



17 16 29.60, 



7.8 



11 



Bessel's Zone, No 



394. 



„ 1 59 6.51, 



11 





17 16 33.80, 



7.8 



>) 



>> i) ?j 



332. 



„ 1 59 6.01, 



)> 





17 16 29.60, 



7.8 



11 



Piazzi 





k = 2 3 52.90, 



h! 



= 



17 16 51.50, 



10 



11 



Anonym. Approx. 





? = 2 17 18.20, 



i' 



= 



17 17 0.70, 



9.10 



11 



» >) 





k = 2 31 58.31, 



K 



= 



15 18.69, 



8.9 



11 



Bessel's Zone, No. 



394. 



„ 2 31 58.10, 



>■> 





15 20.83, 



8.9 



n 



;> 7t » 



141. 



I = 2 32 46.87, 



V 



— 



14 57 48.28, 



9 



11 



ii ii ii 



141. 



„ 2 32 47.35, 



» 





14 57 51.90, 



9 



i> 



ii ii ii 



32. 



The measures and transits observed with the Filarmicrometer were 

 reduced by the formulae of Bessel in the Astr. Nachr. No. 69, and 

 in the Konigsberg Observations, Vol. XV. p. 22. Those of the same 

 star were referred to a common epoch, by means of Encke's Ephe- 

 meris. The probable errors were computed in the usual manner. 

 The true places of the comet in right ascension and declination, were 

 obtained free from aberration, parallax and refraction. 





Sidereal 



Comet's place freed from Aberration, Parallax, 



"3d 





time at 



and Refraction. 



M A 



Date. 



Philadel- 

 phia. 







03 *^ 



a> 









/" 



ct = Comet's true R. A. 



S= Comet's true dec. 



O n 



125 



1842. 



h m s 



m s s 







March 27 



7 54 57 



a + 18.358 ± 0.06 



a' — V 29.38 ± l'.9 



3 



„ 27 



7 59 21 



b + 20.404 ± 0.60 



V + 3 29.28 ±2.3 



3 



„ 28 



7 37 55 



c + 39,279 ± 0.16 



c'+ 7 43.22 ±2.1 



5 



,, 28 



7 50 54 



d + 22.790 ± 0.03 



d'+ 1 20.91 ±0.3 



2 



„ 31 



7 54 35 



/ — 7.860 ±0.12 



/'— 1 46.13 ±1.6 



4 



„ 31 



8 36 34 



g + \ 56.222 ±0.65 





3 



April 1 



7 50 51 



A + 38.149 ±0.34 



h'— 8.51 ±0.4 



3 



ii 5 



8 42 12 



i + 45.608 



i —11 26.31 



1 



„ 11 



8 53 36 



k — 1 41 .525 ±0.19 





4 



„ 11 



8 54 1 



I —2 29.715 ±0.28 





4 



