Sixty-five Stars near 61 Cygni. 



65 





For Parallax. 



Plates. 









P 3 



-P* 



I 



+ 0.727 



+ 0.672 



2 



+ 0.761 



+ 0.632 



3 



-j- 0.761 



+ 0.632 



4 



+ 0.915 



+ 0.366 



5 



+ 0.979 



-f 0.096 



6 



+ o.979 



+ 0.095 , 



7 



+ 0.982 



-\- O.061 



8 



+ 0.798 



+ 0.583 



9 



+ 0.798 



+ 0.583 



IO 



+ 0.845 



+ 0.511 



ii 



+ 0.862 



+ 0.481 



12 



+ 0.862 



-j- 0.480 



13 



+ 0.862 



-j- 0.480 ; 



15 



— 0.962 



— 0.322 



16 



— I.006 



— 0. 142 



17 



— 1.006 



— 0.142 



18 



— I.008 



— 0.125 



19 



— 1.008 



— 0.125 



20 



— I.008 



— 0.125 



In Table VIII, columns two and three, will be found S 3 and # 4 . 

 The coefficient of the parallax, as printed in column eleven of 

 Table V is 



# 3 P S + £ 4 P 4 



and the correction, additive to the distances, is 



(S 3 P 3 + £ 4 P 4 ) 



n 



28/ / OI24 



where U is the parallax expressed in seconds of arc. Table XI 

 gives values of this quantity corresponding to limiting values of 

 the coefficient. The method of using this table is the same as 

 described in paragraph 13. In its construction I used* 



n = + o."3597 



15. The distances thus corrected for all known disturbances af- 

 fecting the central star, 61 x Gygyii, are given in column twelve of 

 Table V. In this column are also the means of the distances. 



Table VI. — Measures of Position-angle. 



16. This table has been put on pages opposite the correspond- 



. *The Parallax of 61 1 Cygni as deduced from Rutherfurd Photographic 

 Measures, by Herman S. Davis. Contribution No. 13. 

 Annals N. Y. Acad. Scl, X, August, 1897.— 5. 



