64 



CELESTIAL MECHANICS: LEUSCHNER 



Elements D are sufficiently accurate to show that observations 

 reported for this planet in 1914-1915 do not belong to Nestor. 



With Elements D and perturbations computed from Elements C 

 an ephemeris was computed for 1918. 



Julie M. Vinter-Hansen has published 12 the special perturbations, 

 (disturbing planets not stated), computed by Pedersen from 1907 to 

 1918. Also Andersen's Elements D brought up to epoch of 1918, 

 (Elements E), and an ephemeris for 1919. 



Seagrave has published 13 an ephemeris for 1920. No reference is 

 made as to what elements were used. 



The most recent work on Nestor is by Kristensen. 14 He begins 

 with Andersen's Elements D, and computes the special perturba- 

 tions due to Jupiter and Saturn and then represents all the observa- 

 tions available from 1908 to 1919. The maximum initial residuals 

 (perturbations included), for the 1919 observations are Aa cos 8 

 64 S .29, AS -|-494".8. He then forms eleven normal places based on 

 all the available observations. The maximum initial residuals appear 

 in the IX Normal place, Aa cos 8 963".0, AS +494".0, (pertur- 

 bations included). The resulting solution of the eleven equations gives 

 Elements F. These elements represent the normal places satis- 

 factorily. The maximum residuals are Aa cos 8 +0 S .16, AS +7".2. 

 He states these Elements F may be considered as a definitive system. 



The elements published in Kleine Planeten, 1917 to 1920, are those 

 of Andersen (Elements C), brought up to new epochs. 



REFERENCES 



*A. N. vol. 177, p. 287. 



3 A. N. vol. 177, p. 399. 

 8 A. N. vol. 178, p. 71. 



4 A. N. vol. 180, p. 213. 



5 A. N. vol. 195, No. 4678, p. 433. 

 * Oppolzer. vol. ii, p. 390-391. 

 T A. N. vol. 196, p. 14. 



8 A. N. vol. 199, p. 221. 



Veroff. R. I. No. 42, remarks 5 

 and 15. 



10 A. N. vol. 200, p. 56. 



"A. N. vol. 206, No. 4923, p. 17. 



"A. N. vol. 208, p. 15-16. 



13 A. J. vol. 32, p. 167. 



"Pub. og mindre Meddelelser fra 

 Kobenhavns Obs. No. 37. 



TABLE 17. Elements (659) Nestor (1908 CS.) 



