256 Prsesepe Group ; Measurement and Reduction 



Star 15. 





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°o7'55".i 9 



— C.25 



54"-94 



20°I3 / 0l // .26 



+o".I2 



!".& 



II 



55 -07 



— -25 



54 .82 





11 



+ -12 



•23 



HI 55 .02 



— -25 



54 -77 





20 



+ .12 



•32 



IV 



55 -26 



— -25 



55 .01 





23 



+ -12 



•35 



V 



54 -74 



+ .12 



54 -86 





39 



— .06 



•33 



VII 



54 -77 



+ .12 



54 -89 





34 



— .06 



.28 



VIII 



54 .84 



+ .12 



54 .96 





39 



— .06 



•33 



IX 



54 -69 



+ .13 



54 .82 





37 



— .06 



•3i 



Mean, i28°07'54".88 



Mean, 2o°i3 



'OI//.32 



Probable Error, ± . 02 2 



Probable Error, 



±.012 



Proper Motion, — 0.054 ±0.006 



Proper Motion, +0.025 ±0.003 



Star 16. 





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°o8'44".8o 



— o".34 



44". 46 



i9°42 / 50 // .oo 



+c/ / .03 



50^.03 



II 



•79 



— -34 



•45 



50 .08 



+ -03 



50 .11 



III 



•73 



— -34 



•39 



49 -91 



+ -03 



49 -94 



IV 



.98 



— -34 



.64 



49 -85 



+ -°3 



49 .88 



V 



•38 



+ -17 



• 55 



49 -97 



— .01 



49 -96 



VII 



.41 



+ .17 



•58 



50 .00 



— .01 



49 -99 



VIII 



•32 



+ -17 



•49 



49 -95 



— .01 



49 -94 



IX 



•15 



+ .17 



•32 



50 .08 



— .01 



50 .07 



Mean, i28°o8'44". 4 8 



Mean, ig°42 / 49 // .99 



Probable Error, ±.028 



Probable Error, ±.021 



Proper Motion, — 0.073 ±0.008 



Proper Motion, +0.006 ±0.006 



