THE GREAT COMET OF 1858. 



73 



Liverpool. Astr. Nachr., XLIX. 267. Mo 



Markree. Observations on Donati's 

 Padua. Astr. Nachr., XL VIII. 357. 



1858, 



Paris. Annales de l'Observatoire Imperial, Paris. Tome XIV. Observations. 



Pulkova. Astr. Nachr., L. 307. Beobachtungen der Grossen Cometen 1858. Otto Struve. 



Santiago. Astr. Nachr., LILT. 131. Astr. Jour., VI. 100. 



Vienna. Astr. Nachr., XLVIII. 349, XLIX. 43, 53, L. 227, LII. 57. 



Williamstown. Astr. Nachr., L. 7. As the latitude and longitude of the place are uncertain, I have not 

 reduced these observations. 



Washington. Astr. Nachr., XLIX. 55, 113, 363. Astr. Jour., V. 150, 158, 166, 180. The comparison 

 star of October 1 is mistaken. 



The typographical errors to be met with are so numerous I cannot undertake to 

 mention them. To render the reduction of the comparison stars from mean to appar- 

 ent place uniform, the elements of reduction in the British Nautical Almanac for 1858 

 were adopted as the standard ; and the same will be used in reducing our normals 

 from apparent to mean places. Consequently it becomes necessary to add to the ob- 

 servations in which the elements of the Berlin Jahrbuch were used, quantities easily 

 obtained from this small ephemeris. 



R. A. Dec. 



II. A» Dec. 



June 15 -f-0.09 +6'. 18 Sept. 18 +0.08 -f 0.03 



July 15 -j" - 02 -j-0.22 Oct. 3 -j-0.07 —0.04 



Aug. 14 -j-0.03 +0.18 Oct. 18 -j-0.04 —0.19 



Sept. 3 4-°-°5 -j-0.10 Nov. 2 -j-0.14 —0.23 



* or the reduction of the observations for parallax, and the computation of the per- 

 ations, an< * f° r comparison, an ephemeris was computed from these elements pub- 

 lished by Searle in the Astronomical Journal, V. 188, Searle's own ephemeris not 

 being sufficiently exact for the purpose of comparison. 



T= Sept. 29.75230 1858 Washington Mean Time. 



n — Q = 129° 6 24*8 



8 = 165 18 46.2 J Mean Equinox and Ecliptic 1858.0 



1 = 116 57 46.1 

 <p— 85 21 21.2 

 log q = 9.7622362. 



In the following list the observations of the comet are given reduced for parallax, 



and 

 catalo 



are made to accord with the places of the comparison stars given in the foregoing 



gue. Gould's list of Longitudes (in the American Ephemeris) has been used in 



Wing the Paris M. T. of Observation. The comparisons in the two last columns are 



bs — Cal - The declinations of the Southern observations have generally been re- 



UCed *° th e time of observing the right ascension ; that observation of right ascen- 



SIOn bein S selected which was nearest in time and which had the same comparison star. 



v ol. a. 



11 



