28 



PARALLAXES OF STAKS— BOOTH AND SCHLESINGEE. 



[Memoirs National 

 [Vol. XIX, 



No other determination of this parallax has been published. Boss gives +0".019 for the 

 proper motion. 



This star forms j3 63 with a star two magnitudes fainter at a distance of 1". Slow orbital 

 motion is present. 



(5io) K Delphini, 20 h 34 m , +9° 44'. 



+12.80 c- 5.44 m-2.48?t=- 0.0437 mm. c= -0.0006 niin. 

 +190.38 +7.04 =+ 1.2017 n=+ .00626. 



+7.39 =+ .0524 r—+ .00092. 



Probable error for unit weight, ± .0016 mm. = ±".024. 

 Annual proper motion in R. A., + ".334 ±".006. 

 Relative parallax, + ".013±".009. 



The spectroscopic determination of this parallax at Mount Wilson yields +0".044. Boss 

 gives +0".319 for the proper motion. 



There is an eleventh magnitude companion, now distant 20", with which this star forms 

 OS 533. The proper motions show that the two are not physically related. 



(511) and (512) 



7 Delphini, 20 h 42 m , +15° 46'. 



Plate 13427 has two exposures only. 



