250 



Prassepe Group; Measurement and Reduction 



Star i. 





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 



i27°35 / 3i // -25 



— o".43 



30 // .82 



20°26 / 52 // .6o 



+o".i5 



52". 75 



II 



30 



80 



— -43 



•37 



•47 



+ -15 



.62 



III 



30 



94 



— -43 



• 51 



• 5 2 



+ -15 



.67 



IV 



31 



16 



— -43 



•73 



.64 



+ :i5 



•79 



V 



30 



46 



+ .21 



.67 



.84 



— -07 



• 77 



VII 



30 



47 



4- .21 



.68 



•79 



— -07 



.72 



VIII 



30 



45 



+ .21 



.66 



.60 



— .07 



•53 



IX 



30 



22 



+ .21 



•43 



.90 



— -07 



.83 



Mean, 



i27°35 / 3o / ^.6i 



Mean, 2o°26 / 52 // .7i 



Probable Error, 



±.041 



Probable Error, ±.026 



Proper Motion, 



• — 0.091 ±0.011 



Proper Motion, +0.032 ±0.007 



Star 2. 



Plate. 



I 



II 



III 



IV 



V 



VII 



VIII 



IX 



Right Ascension : 



At Epoch of 

 Plate. 



l27°36 / 26 // .i7 



26 .21 



26 .03 



26 .15 



25 -74 



25 .65 



25 .60 



25 .71 



P. 



M. 



— 



"•31 



— 



•31 



— 



•31 



— 



•31 



+ 



•15 



+ 



.15 



4- 



•15 



+ 



.15 



At Epoch 

 1875.0. 



25^.86 

 .90 

 •72 

 .84 

 .89 

 .80 

 •75 



Mean, 

 Probable Error, 



Proper Motion, 



i27°36'25".83 



±.018 



— 0.066 ±0.005 



Declination 



At Epoch of 



P. M. 



Plate. 





20°IO / 02 // .04 



'+o // .i5 



.10 



+ .15 



.06 



+ -14 



.14 



4- -14 



.26 



— -07 



•32 



— -07 



.24 



— .07 



.40 



— -07 



At Epoch 

 1875.0. 



•19 

 .25 

 .20 

 .28 

 .19 

 •25 

 •17 

 •33 



Mean, 2o°io / 02 // .23 



Probable Error, ±.015 



Proper Motion, 4-0-03 1 ±0.004 



