Academy of Sciences.] 

 No. 2.] 



(488) and (489) 



INDIVIDUAL DETERMINATIONS. 

 44 Bootis, 15 h m , +48° 3'. 



17 



Plate 2459 has two exposures only. 



FAINTER COMPONENT. 



+15.90 c- 8.37/i-0.08*-=+ 0.1098 mm. c=+0.0030 mm. 

 +213.03 +4.04 =- 1.5838 /*=- .00739. 



+9.25 =+ .0037 x=+ .00366. 



Probable error for unit weight, ± .0017 mm. = ±".026. 

 Annual proper motion in R. A., — ".394 ^"'.006. 

 Relative parallax, + ".053±".008. 



BRIGHTER COMPONENT. 



+15.90 c- 8.37 /i-0.08tt=+ .1096 mm. c=+0.0025 mm. 

 +213.03 +4.04 =- 1.7857 i±=- .00839. 



+9.25 =+ .0152 ir=+ .00533. 



Probable error for unit weight, ± .0019 mm. = ±".028. 

 Annual proper motion in R. A., — ".447±".007. 

 Relative parallax, + ".078±".009. 



The mean by weight is + ".065 ± ".006. 



The spectroscopic determinations at Mount Wilson yield +0".066 and +0".072. Boss 

 gives -0".424 and -0".384 for the proper motions. Most of the differences of these proper 

 motions from each other and from the photographic results is due to orbital motion. 

 90686°— 23 2 



