36 CELESTIAL MECHANICS: LEUSCHNER 



Observations by T. J. J. See in 1899 Sept. compared with a man- 

 uscript ephemeris by Eichelberger gave the corrections +0 S .8 in a, 

 +50" in 8. "The comparison would indicate that Eichelberger's 

 theory is very good." Same year and date Coddington observed 

 Minerva and compared "with an ephemeris furnished by Professor 

 Newcomb." Same corrections as See found to Eichelberger's 

 ephemeris. 



The planet discovery 1902 HQ (February 25), by Wolf 4 was sus- 

 pected to be (93) Minerva and the identity was confirmed by two 

 observations from Bordeaux. 5 



The work of Eichelberger was undertaken originally under the 

 auspices of the Watson Trustees, but the Trustees suspected that the 

 small residuals which resulted from a comparison of theory and obser- 

 vation were due to some error. Investigation of the sources of the 

 suspected error undertaken by Leuschner at the request of the Trustees 

 confirmed Eichelberger's work, the representation of the observations 

 being found entirely satisfactory, in view of the fact that only first 

 order perturbations of Jupiter were considered. 



Leuschner 6 revised the elements by including in the least squares 

 solution further oppositions to 1902, so that his elements are based 

 on oppositions extending from 1867 to 1902. The elements differ only 

 slightly from those by Eichelberger. In the Perturbations and Tables 

 of Twelve Watson Asteroids, 6 Eichelberger's perturbations are retained 

 without change. Observations of recent years are well represented by 

 the ephemerides published in Kleine Planeten by the Berlin Rechen- 

 institut on the basis of these elements and tables, as is indicated by 

 comparison with approximate photographic positions at Konigstuhl 7 

 in 1918 and at Algiers in 1921. 8 Further corrections of the elements 

 should be undertaken only on the basis of perturbations by Jupiter of 

 the second order, and of perturbations by other major planets. 



For the group of minor planets having a mean motion of about 750" 

 (the Minerva group), D. T. Wilson 9 has computed tables after the 

 method of Bohlin. No application of this theory seems to have been 

 made to (93). 



REFERENCES 



1 A. N. vol. 70, p. 45. * Memoirs of the National Academy 



9 A. N. vol. 70, p. 205. of Sciences, vol. x, seventh memoir. 



* Memoirs of the National Academy Washington, 1910. 



of Sciences, vol. viii, third memoir. T Eph. Z, A. N. 1918/558. 



Washington, 1899. 8 C. O. M. 1921/171. 



* A. N. vol. 158, p. 95. 9 Astronomiska lakttagelser och Un- 

 'A. N. vol. 158, p. 175; A. N. vol. dersokningar. vol. 10, No. 1, Stock- 



160, p. 352. holm. 



