258 



Prsesepe Group; Measurement and Reduction 



Star 19. 



Plate. 



Right Ascension : 



Declination : 



At Epoch of 

 Plate. 



P.M. 



At Epoch 

 1875.0 



At Epoch of 

 Plate. 



P.M. 



At Epoch 

 1875.0. 



II 



IV 



V 



VII 



VIII 



I28°ii'36".o6 



36 -37 

 35 -95 

 35 -86 

 35 -72 



— o".25 



— -25 



4- .12 



+ .12 

 + -12 



35". Si 

 36 .12 

 36 .07 

 35 .98 



35 .84 



20°35'5o".68 



.64 

 .69 



.87 

 .82 



4- 0^.09 

 4- -09 



— .04 



— .04 



— .04 



50". 77 

 •73 

 .65 

 .83 

 • 78 



Mean, 128 n'35". 96 

 Proper Motion, — 0.053 



Mean, 2o°35'so".75 

 Proper Motion, 4-°- OI 9 



Star 20. 





Right Ascension : 



Declination : 



Plate. 















- 



At Epoch of 



P. M. 



At Epoch 



At Epoch of 



P. M. 



At Epoch 





Plate. 





1875.0 



Plate. 





1875.0. 



I 



I28°il / 5I // .8S 



— // .20 



51". 68 



i9°58'5o".4o 



+o // .o8 



5o".48 



II 



•77 



— .20 



•57 



.42 



+ .08 



.50 



III 



•75 



— .20 



•55 



•39 



+ .08 



■47 



IV 



•77 



— .20 



•57 



.40 



+ .08 



.48 



V 



•49 



+ .IO 



•59 



•50 



— .04 



.46 



VII 



.42 



+ .IO 



•52 



•37 



— .04 



•33 



VIII 



•5i 



+ -IO 



.61 



•50 



— .04 



.46 



IX 



•58 



+ .10 



.68 



.68 



— .04 



.64 



Mean, 128 u'51". 60 



Mean, ig°58'5o".48 



Probable Error, ±.016 



Probable Error, ± .023 



Proper Motion, — 0.042 ±0.004 



Proper Motion, +0.016 ±0.006 



