Academy of Sciences.] 

 No. 2.] 



INDIVIDUAL DETEKMINATIONS. 



29 



FAINTER COMPONENT. 



c=+0.0010 mm. 

 M=- .00021. 



+14.40 c+ 13.69 m-4.80x=+ 0.0057 mm 

 +238.76 +7.47 =- .0258 



+8.77 =+ .0051 tt=+ .00133 



Probable error for unit weight, ± .0010 mm. = ±".015. 

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

 Relative parallax, + ".019±".006. 



BRIGHTER COMPONENT. 



+14.40 c+ 13.69 p-4.80 jr=- 0.0318 mm. c=-0.0012mm. 

 +238.76 +7.47 =- .1438 l i=- .00058. 



+8.77 =+ .0140 jr=+ .00145. 



Probable error for unit weight, ± .0009 mm. = ±".013. 

 Annual proper motion in R. A., — ".031±".003. 

 Relative parallax, + ".021 ±".005. 



The mean is +0".020±0".004. 



Other determinations are: Mount Wilson (spectroscopic), +0".032 and +0".021; McCor 

 mick, +0".046±0".008 and +0".038±0".009; Swarthmore, -0".008±0".014 and 

 + 0".007 ± 0".012. Boss gives - 0".016 and - 0".029 for the proper motions. 



These two stars have the same large proper motion except for a small difference 

 probably due to slow orbital motion. 



(513) and (514) 



02 447, 21 h 36 m , +41° 16'. 



Plate 9746 and plate 13548 have two exposures only. 

 Plate 9777 has four exposures. 



BRIGHTER COMPONENT. 



c= -0.0005 mm. 

 M =_ .00007. 



+12.10 c+ 5.11 m -3.65 tt=- O.00G7mm. 

 +90.16 +0.68 =- .0093 



+7.55 =+ .0015 tt= - .00005. 



Probable error for unit weight, ± .0014 mm. = ±".020. 

 Annual proper motion in R. A., — ".004±".008. 

 Relative parallax, ".000±".008. 



FAINTER COMPONENT. 



+11.30 c+ 3.11 m-4.24 «■=+ 0.0026 mm. c= +0.0002 mm. 

 +85.16 -0.80 =+ .0070 M =+ .00007. 



+7.11 =- .0017 «•=- .00013. 



Probable error for unit weight, ± .0008 mm. = ±".012. 

 Annual proper motion in R. A., + ".004±".005. 

 Relative parallax, - ".002±".005. 



