Academy of Sciences.] 

 No. 2.] 



(521) 



INDIVIDUAL DETERMINATIONS. 

 o- Pegasi, 22 h 47 m , +9° 18'. 



33 



+12.90 c- 1.99 m-1.S4it=- 0.0361mm. c=-0.0010mm. 

 +186.18 -5.28 =+ 1.7933 m=+ .00968. 



+7.24 =- .0352 tt=+ .00194. 



Probable error for unit weight, ± .0016 mm. = ±".023. 

 Annual proper motion in R. A., + ".516 ±".006. 

 Relative parallax, + ".028±".009. 



Other determinations of this parallax are: Yale (heliometer) , +0". 011+0". 040; Yerkes, 

 + 0".043±0".010; Mount Wilson (spectroscopic), +0".038. Boss gives +0".517 for the 

 proper motion. 



(583) 



tv Cephei, 23 h 5 m , +74° 51'. 



+13.70 c+ 7.55 ju-2.56 r =— 0.0437 mm. c= -0.0030 mm. 

 +90.01 -2.18 =- .0494 /*=- .00029. 



+8.42 =+ .0101 *■ = + .00022. 



Probable error for unit weight, ± .0017 mm. = ±".025. 



Annual proper motion in R. A. 

 Relative parallax, 



+ 



'.016 ±".010. 

 '.003 ±".008. 



Other determinations of this parallax are: Mount Wilson (spectroscopic), +0".011; 

 Swarthmore, -0".020±0".012. Boss gives +0".013 for the proper motion. 



There are at least three stars in this system. The image on the plates is the combined 

 image of a close double (02489), the components differing by two magnitudes. Comparatively 

 rapid orbital motion is present. The brighter star is a spectroscopic binary. 

 90686°— 23 3 



