CELESTIAL MECHANICS: LEUSCHNER 



(716) BERKELEY, 1911 MD. 



Discovered by Palisa 1 at Vienna on July 30, 1911. 



The first preliminary Elements A were computed by Hopfner 2 and 

 are based on observations 1911, July 30, August 17, and September 3. 

 He also gives an approximate ephemeris for 1911. 



Hopfner's Elements A represented the observation of 1906, July 16, 

 for (1906 UN 1 *) as follows: Aa l m .4 AS 4'.8. Berberich 3 an- 

 nounces (1906 UN 1 *) is identical with (716) Berkeley. 



An ephemeris is published by Cohn 4 for 1912. An observation by 

 Palisa 5 for November 4, 1912, gives a correction to the ephemeris, 

 Aa 2 m .7 and AS 8'. 



A new set of Elements B computed by Stracke 6 is based on obser- 

 vations 1911, August 3, 29, and September 23. These elements repre- 

 sent the observation of 1906, July 16, for (1906 UN 1 *) as follows: Aa 

 +2 m .4 and AS +4'. 



Stracke's elements are published and used in B. J. 1915 and up to 

 1919 in Kleine Planeten. 



An orbit, Elements C, based on three normal places 1911, July 30, 

 August 22, Septemer 17, was computed by Neubauer 7 using Leusch- 

 ner's Short Method. 8 A comparison between observation and compu- 

 tation, for observations in 1906, 1912, 1914, of Elements C and 

 Stracke's Elements B, showed that Elements C gave the better repre- 

 sentation. Neubauer also computes general perturbations by the 

 Bohlin method, 9 with the tables computed by Wilson 10 for the group 

 750. 11 More accurate starting elements connecting several oppositions 

 by special perturbations seem to be desirable. 



REFERENCES 



A. N. 189, p. 109. 



A. N. 189, p. 244. 



A. N. 189, p. 364. 



A. N. 192, p. 426. 



A. N. 193, p. 62. 



A. N. 192, p. 421-423. 



L. 0. Bull. No. 301. 



L. O. Pub. vol. vii, part viii. 



'"Formeln and Tafeln zur gruppen- 

 weise Berechnung der Allgemeinen 

 Storungen Benachbarter Planeten," Up- 

 sala 1896, and "Sur le Developement 

 des Perturbations Planetaires," Stock- 

 holm 1902. 



10 Ast. lakttagelser Och Undersok- 

 ningar, Band 10, No. 1, Stockholm. 



TABLE 18. Elements (716) Berkeley (1911 MD) 



