46 CELESTIAL MECHANICS: LEUSCHNER 



(433) EROS, 1898 DQ. 



Discovered 1898, August 13, by Witt at Berlin and by Charlois at 

 Nice. 



Fayet 1 computed Elements A from three observations on August 

 15, 26, and September 7. Later he 2 computed Elements B from 

 normal places 1898 August 16.5(7 observations), September 17.5(6 

 observations), and October 22.4(2 observations). The residuals vary 

 from s . 11 to 8 .36 in a, and +5".l to +8".2 in 8. 



Hussey 3 gives Elements C, computed from the mean of two Kiel 

 observations made on the 15th of August, and observations made at 

 Mt. Hamilton on September 6 and 27. Hussey 4 later computed Ele- 

 ments D from observations at Mt. Hamilton on August 15, September 

 27, and November 11, 1898. The residuals for the observations in 

 1898 vary from +0 S .04 to 8 .18 in a, and +2".2 to +4".4 in 8 

 and observations to May 4, 1899, are closely represented. 



Chandler 5 computed Elements E from observations August 14 to 

 November 16, 1898. Elements F 6 and G 7 are also due to Chandler. 

 Elements F are from eight normal places from August 17.5 to No- 

 vember 26.5. The representation is within the errors of observation. 



In a later article he gives the following residuals for earlier observa- 

 tions found on plates taken in 1896 at Arequipa: 



1896 Aa AS 



April 6 -O m 36?0 -4'9 



June 5 -1 16 7 -5'8 



Elements G 7 are the preceding ones with corrections applied so 

 as to fit the observations made at Arequipa 1896. Representation 8 

 for 1893, 1894, 1896, gives maximum residual of +7 8 .6 in a and 

 I'.O in 8. 



The observations from 1893 to February 16, 1894, were found by 

 Pickering and Mrs. Fleming on plates taken at Cambridge. Per- 

 turbations were not considered in applying the corrections to Ele- 

 ments F to obtain Elements G. 



Elements H are due to Berberich 9 and are given under the title of 

 "First elements," and are based upon observations made at Urania 

 (Berlin) on the 14, 23, and 31 of August. Berberich gives forty-three 

 sets of residuals covering the period August 13 to August 31, Aa be- 

 ing greater than O s .40 but three times, and AS being larger than 

 10".0 but twice. 



Elements I 10 J 11 K 12 and L 13 are due to Russell. Elements I are 

 computed from three normal places obtained by comparison of ob- 

 servations in the A. N. and A. J. with places computed from Ber- 



