ASTEROID, 1909, JA. 



BY SETH NICHOLSON AND ALMA M. STOTTS. 



(Abstract.) 

 The discovery of the minor planets or asteroids has become so gen- 

 eral in recent years, that the work of following them after their dis- 

 covery is of great importance. After an orbit has been calculated the 

 asteroid can be identified and a permanent number and name given to 

 it; then it is a known member of our Solar System. The asteroid 

 whose orbit and ephemeris have been computed and are given in this 

 abstract, was discovered by Joel H. IMetcalf at Taunton, Mass. 



ELEMENTS AND EPHEMERIS OP PLANET 1909 JA. 

 Epoch 1909, Dec. 31.5, G. M. T. 

 M= 52° 40' 56".l 



7r=339° 10' 45".l") 7r=339° 12' 25".5 ] 



0=231" 25' 31".l 1^ 1909.0 fi=231° 27' 14".6 1 1911.0 

 i= 15" 47' 07".6J i= 15° 47' 07".l J 



*= 19° 08' 48".7 



log ^1=2.909696 

 log a=0. 426874 



RESIDUALS (0— C) 



Aa A5 



1909. Dec. 3 I +0^05 — 0".l 



Dec. 31 II +0.05 0.0 



1910. Jan. 28 III +0.03 —0.1 



HELIOCENTRIC CO-ORDINATES 1909.0 



x= (9.989949) r sin (320° 20' 50'".2 + u) 

 y=(9.98847o)r sin (227^^ 26' 05".2+u) 

 z= (9.493198)1- sin (271° 59' 03".2+u) 



HELIOCENTRIC CO-ORDINATES 1911.0 



x=(9.989941)r sin (320° 22' 34".5 + u) 

 y=(9.9S8466)r sin (227° 27' 39".8+u) 

 z=(9.493376)r sin (272° 00' 40".2 + u) 



