254 



Prsesepe Group ; Measurement and Reduction 



Star 8. 



Plate. 



Right Ascension : 



Declination : 

















At Epoch of 



P. M. 



At Epoch 



At Epoch of 



P.M. 



At Epoch 





Plate. 





1875.0. 



Plate. 





1875.0. 



I 



i27°57 / 59"-38 



— o".34 



9 // .o4 



20°26 / I2 // .54 



+0".I2 



12". 66 



II 



59 -33 



— -34 



.04 



•51 



+ .12 



•63 



III 



59 M 



— -34 



•30 



■63 



+ .12 



•75 



IV 



59 -42 



— -34 



.08 



.69 



+ .12 



.81 



V 



59 -08 



+ -17 



•25 



•79 



.06 



•73 



VII 



58 .90 



+ -17 



.07 



.69 



— .06 .63 



VIII 



58 .86 



+ -17 



•03 



.70 



.06! .64 



IX 



58 -95 



+ .17 



.12 



.88 



— .06 .82 



Mean, i27°57'5g".i2 



Mean, 20 26' 12". 71 



Probable Error, ±.028 



Probable Error, ±.022 



Proper Motion, — 0.072 ±0.008 



Proper Motion, -|- - 02 5 ±0.006 



Star 10. 





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 



i2 7 58 / 48 // .6 5 



— O^.K) 



48". 46 



20°o6 / 5o // .4o 



+o".i4 



50". 54 



II 



.76 



- .19 



•57 



• 33 H -14 



•47 



III 



•83 



— .19 



.64 



.27 + .14 



.41 



IV 



• 77 



— -19 



.58 



•34 + -14 



.48 



V 



• 47 



+ -09 



•56 



.52 — .07 



•45 



VII 



•34 



+ .09 



•43 



.58 , — .07 



•5i 



VIII 



.42 



+ -09 



•5i 



.48 , — .07 



.41 



IX 



•67 



+ -09 



.76 



.56 — .07 



•49 



Mean, 



i27°58'48".56 



Mean, 2o°o6 / 5o".47 



Probable Error, 



±.028 



Probable Error, ±.012 



Proper Motion, 



— 0.040 ±0.008 



Proper Motion, -f-0.029 ±0.003 



