276 Praesepe Group; Measurement and Reductiot 



Comparison with Heliometer Results. 

 Heliometer minus Photographs. 





Right Ascension. 



Declination 





Proper Motion. 





Star. 

















Diff's in 



DiflPsin 



No. of 

 Plates. 



Direct 



Corr'd. 



Direct 



Corr'd. 





Diff's. 



Diff's. 



Diff's. 



Diff's. 



R 



. As. 



Decl. 





I 



— C 



.04 



+c 



.07 



4-0.40 



— C 



.08 



4-O.Ol6 



—0.015 



8 



2 



— 



•03 



— - 



.02 



4- .46 



— 



.04 



— 



.014 



— 



.020 



8 



3 



— 



• 17 



— 



.24 



+ .61 



4- 



.10 



4- 



.Oil 



4- 



.004 



7 



4 



+ 



.24 



+ 



.09 



4- -73 



4- 



.20 



— 



.019 



4- 



.005 



8 



5 



■ — ■ 



•15 



+ 



•03 



4- .67 



4- 



•13 



4- 



.02I 



4- 



.001 



8 



6 



— 



•05 



+ 



.06 



4- -55 



— 



.02 



— 



.Oil 



— 



.032 



8 



7 



+ 



.12 



4- 



.06 



4- .67 



+ 



.07 



— 



.004 



4- 



.018 



8 



8 



— 



.11 



4- 



.01 



+ -50 



— 



.10 



— 



.004 



— 



.020 



8 



IO 



+ 



.11 



4- 



.12 



4- .72 



4- 



.10 



— 



.030 



— 



.022 



8 



ii 



■ — 



.01 



— 



•03 



4- -67 



4- 



.04 



4- 



.003 



— 



.013 



8 



14 



— 



.26 



— 



.10 



4" -74 



+ 



.08 



— 



.032 



— 



.008 



8 



15 



— 



.11 



— 



.06 



4" -52 



— 



•15 



— 



.019 



— 



.008 



8 



16 



+ 



•38 



4- 



•25 



4- -57 



— 



.12 



— 



.007 



4- 



.001 



8 



17 



+ 



.22 



4- 



.18 



+ .70 



4- 



.01 



— 



.017 



— 



.019 



8 



iS 



+ 



.16 



4- 



• 13 



4- .62 



— 



.08 



— 



.023 



— 



.028 



8 



19 



— 



.27 



— 



.09 



4- .71 



4- 



.04 











5 



20 



+ 



•03 





.00 



4- .66 



— 



.04 



— 



■035 



— 



.022 



8 



22 



— 



.20 



— 



.07 



4- .67 



— 



.02 



— 



.007 



— 



.017 



8 



2 3 



— 



.08 



+ 



.04 



4- -79 



4- 



.09 



— 



.020 



— 



.031 



8 



24 



— 



.06 



— 



.09 



4-1.04 



4- 



•31 



— 



.016 



— 



.Oil 



8 



25 



— 



.02 





.00 



4- .62 



— 



.10 



— 



.016 



— 



.Oil 



8 



26 



+ 



.20 



4- 



.10 



+ .69 



— 



•05 



— 



.014 



— 



.006 



8 



27 



+ 



.08 



+ 



.10 



4- -87 



4- 



.14 



— 



.032 



— 



•033 



8 



28 



— 



•25 





.18 



4- .68 



— 



.04 



— 



.028 



— 



.014 



8 



29 



— 



■51 



— 



•31 



4- -73 



4- 



.02 



— 



.004 





.026 



8 



3i 



+ 



.01 



— 



.02 



+ .80 



4- 



.06 



— 



.007 





.017 



8 



32 



+ 



•32 



+ 



• 17 



4- .80 



4- 



.04 



— 



.014 



— 



.002 



8 



33 



+ 



.07 



— 



.07 



4- -74 



— 



.02 



+ 



.009 



— 



.Oil 



7 



34 



+ 



.07 



4- 



.11 



4- -94 



4- 



.19 



4- 



.002 







.010 



8 



35 



— 



•32 



— 



.09 



+ .66 



— 



.08 



— 



.009 



— 



.026 



8 



36 



— 



• 13 



— 



.02 



+ -79 



4- 



•03 



4- 



•037 



— 



.030 



7 



37 



— 



.06 



— 



.07 



+ .68 



— 



.10 



— 



.001 



— 



.006 



8 



38 



— 



•05 



4- 



•03 



4- -93 



4- 



.14 



— 



.018 



— 



.008 



6 



39 



— 



.14 



— 



•03 



4- -77 



— 



.02 



4- 



.008 



— 



.010 



8 



dO 



4- 



.08 



— 



.04 



4- -57 



— 



• 25 



4- 



.028 



4- 



.001 



8 



4i 



— 



.11 



— 



.09 



4- .78 



— 



•05 











2 



42 



— 



•23 



— 



.20 



4- .66 



— 



.18 











2 



43 



— 



.16 



— 



.06 



4- .91 



4- 



.07 



4- 



.031 



— 



.002 



8 



44 



— 



.11 



4- 



.09 



4- -7i 



— 



.12 



— 



.017 





.000 



8 



45 



■ 



.07 





• 13 



4- .58 





•30 



4- 



.018 



4- 



.Oil 



7 



The corrected differences in right ascension and declination 

 were obtained by adding systematic corrections and also by modi- 

 fying the scale-value and orientation of the photographs. That 

 is, a least-square solution was made to determine how much the 



