22 



PAKALLAXES OF STAES— BOOTH AND SCHLESINGER. 



[Memoirs National 

 [Vol. XIX, 



PRECEDING COMPONENT. 



+16.10 c- 21.77,1- 2.71 x=- 0.0666 mm. c=-0.0103mm. 

 +351.32 +17.56 =- 1.3921 M =- .00461. 



+ 9.80 =- .0512 *■=+ .00021. 



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

 Annual proper motion in R. A., — ".246±".004. 

 Relative parallax, + ".003 ±".006. 



FOLLOWING COMPONENT. 



+ 16.10 c- 21.77 n- 2.71 *■=- 0.0789 mm. c=-0.0110mm. 

 +351.32 +17.56 =- 1.3212 n=- .00441. 



+ 9.80 =- .0544 *■=- .00069. 



Probable error for unit weight, ± .0017 mm. = ±".024. 

 Annual proper motion in R. A., — ".235±".005. 

 Relative parallax, - ".010 ±".008. 



The mean by weight is-0".002±0".005. 



Other determinations: Mount Wilson (spectroscopic), +0".026 

 more, -0".011 ±0".009 and +0".016±0".009; McCormick, 

 + 0".046±0".011; Yerkes, +0".018±0".008 and +0".009±0".009. 

 for the proper motion of the midway point. 



These two stars, now 4" apart, show very slow orbital motion. 



and +0".029; Swarth- 



+ 0".018±0".012 and 



Porter gives -0".246 



The preceding star is 



itself a close binary system, Secchi 2, always very close and with a comparatively short period. 



(499) 



Piazzi 233, 19 h 35 m , +49° 3'. 



+13.30 c+ 23.19 m-4.84 ir=+ 0.0133 mm. c=-0.0000mm. 

 +260.90 -3.32 = + .1618 m=+ .00062. 



+8.59 =- .0001 tt=+ .00022. 



Probable error for unit weight, ± .0011 mm. = ±".016/ 

 Annual proper motion in R. A., + ".033 ±".004. 

 Relative parallax, + ".003±".006. 



No other determination of this parallax has been published. Porter gives +0".026 for 

 the proper motion. 



