Academy of Sciences.] 

 No. 2.] 



INDIVIDUAL DETERMINATIONS. 



27 



No other determination of this parallax has been published. Porter gives — 0".010 for the 

 proper motion. 



This star forms 22634 with a 9.5 magitude star distant 6". They have the same large 

 proper motion except for a little difference probably due to slow orbital motion. 



(508) 



Groombridge 3150, 20" 17 m , +60° 32'. 



+15.60 c+ 5.95 m- 5.69 ir=+ 0.0991mm. e= +0.0043 mm. 

 +207.87 + 3.92 = + 1.8421 M =+ .00868. 



+10.27 =+ .0445 tt=+ .00340. 



Probable error for unit weight, ± .0014 mm. = ±".021. 

 Annual proper motion in R. A., + ".402 ±".005. 

 Relative parallax, + ".050 ±".007. 



Other determinations of this parallax: Yale (heliometer), +0".105 ±0".021 ; Mount Wilson 

 (spectroscopic), +0".066. Boss gives +0".478 for the proper motion. 



(509) 



1 Delphini, 20 h 26 m , + 10° 34'. 



+14.40 c+ 17.63 yu-3.62ir=+ 0.0264 mm. c=+0.0011 mm. 

 +195.04 +8.31 =+ .1230 M = + .00055. 



+9.42 =- .0024 jr=- .00033. 



Probable error for unit weight, ± .0021 mm. = ±".031. 

 Annual proper motion in R. A., + ".029 ±".009. 

 Relative parallax, - ".005 ±".011. 



