12 PARALLAXES OF STARS— BOOTH AND SCHLESINGER. 



(478) Geminorum, 6 h 46 m , +34° 5'. 



[Memoirs National 

 [Vol. XIX, 



+11.90 c+ 16.70/1- 0.20 jr=- 0.0120 mm. c=-0.0012mm. 

 +322.07 +17.92 =+ .0446 /*= + .00012. 



+ 9.23 =+ .0154 tt=+ .00142. 



Probable error for unit weight, ± .0018 mm. = ±".027. 

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



Relative parallax, 



+ ".021 ±".009. 



No other determination of this parallax has been published. Boss gives +0".007 for the 

 proper motion. 

 («9) 15 Lyncis, 6 h 49 m , +58° 33'. 



+13.30 c+ 18.63 m- 0.75 *■=- 0.0046 mm. c= -0.0005 mm. 

 +278.92 +17.79 =+ .0235 m=+ .00009. 



+10.26 =+ .0058 *■=+ .00037. 



Probable error for unit weight, ± .0013 mm. = ±".019. 

 Annual proper motion in R. A., + ".005 ±".005. 



Relative parallax, 



+ ".005 ±".006. 



Other determinations of this parallax are: At Swarthmore, +0".023±0".011; at Mount 

 Wilson (spectroscopic), +0".011. 



This is a binary star, OS 159, the components of which differ by 1.1 magnitude and are now 

 about 0".8 apart. The above measures refer to the combined image. Boss gives +0".006 

 for the proper motion in right ascension of the middle point between the two components. 



