PART I. 



Definitive Determination of the Elements from the 

 Appearances of 1889-90 and 1896-97. 



A. — Preliminary Correction to Elements. 



8. The elements, deduced by Bauschinger^ from the first 

 appearance of the comet in 1889-90, were slightly indetermi- 

 nate. I solved his equations anew and expressed the elements 

 in terms of an indeterminate quanity, v, the limits of variation 

 of which were placed at ± 40." These elements were carried 

 forward to the time of perihelion passage in 1896, the indeter- 

 minate, V, being retained and carried through the computations. 

 During the interval 1 889-97, the perturbations of Jupiter, Saturn 

 and the Earth were taken into account ; those due to Mars 

 were considered for a short period only. With the resulting 

 elements,^ an ephemeris of the comet was computed for the 

 possible times of visibility in the years 1895 and 1896. 



The comet was rediscovered by Javelle at Nice on June 20, 

 1896, and a comparison of his observation with the above 

 mentioned ephemeris gave the following differences, in the sense 

 observed minus computed, 



Aa=: — o™ 24' .61 

 This observation was sufficient to determine a close approxima- 



1 " Untersuchungen tiber den periodischen Kometen 1889 V (Brooks)," I Theil ; 

 "Definitive Bahnbestimraung des Haupt-Koraeten aus der Erscheinung 1889 bis 

 1891." 



^ " Researches upon Comet 1889 V," Astr. Jour., No. 302, p. 123. 



3 " Preliminary note on the Re-appearance of Comet 1889 V," Astr. Jour., No. 

 320, p. 63. 



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