26 



PAKALLAXES OF STAKS— BOOTH AND SCHLESINGER. CM *" mE8 r ^ 1 ^ 



The spectroscopic determination of this parallax at Mount Wilson yields + 0".036. Boss 

 gives — 0".031 for the proper motion. 



This star forms /3980 with a thirteenth magnitude star distant 7". The two have the 

 same proper motion. 



(506) 



27 Cygni, 20 h 3 m , +35° 42'. 



+ 16.30 c- 20.09 m- 5.29 ir=+ 0.1490 mm. c= +0.0046 mm. 

 +333.77 +21.48 =- 1.4281 p=- .00410. 



+10.63 =- .0964 w=+ .00149. 



Probable error for unit weight, ± .0012 mm. = ±".017. 

 Annual proper motion in R. A., — ".219 ±".004. 

 Relative parallax, + ".022 ±".006. 



Other determinations of this parallax are: Mount Wilson (spectroscopic), +0".052; 

 Yerkes, +0".045±0".007. Boss gives -0".229 for the proper motion. 



(507) 



Lalande 38613, 20 h 5 m , +16° 30'. 



+13.60 c+ 4.09 /i- 4.01 tt=+ 0.0194 mm. c=+0.0018 mm. 

 +396.40 +16.85 =- .0393 m=- .00016. 



+ 8.91 =- .0006 tt=+ .00104. 



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

 Annual proper motion in R. A., — ".009 ±".003. 

 Relative parallax, + ".015 ±".007. 



