Academy of Sciences.] 

 No. 2.] 



INDIVIDUAL DETEKMINATIONS. 



15 



FAINTER COMPONENT. 



+9.10 c+ 8.17 ii- 0.23 ir=- 0.0056 mm. c=-0.0066mm. 

 +243.18 +13.31 =+ 1.5829 /i=+ .00666. 



+ 6.26 =+ .0981 r=+ .01280. 



Probable error for unit weight, ± .0023 mm. = ±".034. 

 Annual proper motion in R. A., + ".355±".0O9. 

 Relative parallax, + ".019±".014. 



The fainter component is hardly good enough to measure on these plates, the sector having 

 been adjusted for the brighter. The mean by weight is +0".009±0".009. Other determina- 

 tions, for the brighter: Mount Wilson (spectroscopic), +0".044; Yale (heliometer) , 

 -0".046±0".030. For the fainter: Mount Wilson (spectroscopic), +0".016. Boss gives 

 + 0".305 and +0".305 for the proper motions. Very slow orbital motion is present. 



This pair is only 6' from Weisse 10 h 234, a faint star with large proper motion. That there 

 is no physical connection with y Leonis is shown by the parallaxes, that of Weisse 10 h 234 being 

 nearly 0".2. 



< 48s > 88 Leonis, ll h 27 m , +14° 55'. 



+ 10.10 c+ 23.95/»-0.66 ir=- 0.1299 mm. c= +0.0006 mm. 

 +187.91 +0.98 =- 1.0387 M =- .00561. 



+6.28 =+ .0048 tt=+ .00176. 



Probable error for unit weight, ± .0013 mm. = ±". 018. 

 Annual proper motion in R. A., — ".299 ±".006. 

 Relative parallax, + ".026 ±".007. 



Boss 



The spectroscopic determination of this parallax at Mount Wilson yields +0".029. 

 gives — 0".330 for the proper motion. 



This star has a companion two magnitudes fainter and distant 15" with which it forms 

 2 1547. The two have the same large proper motion except for a small difference probably due 

 to orbital motion. Boss's proper motion includes a part of this orbital motion. 



