CastorvsRuchbah
Castor has a higher Right Ascension (8 vs 1 h), while Ruchbah has a higher Color Index (B-V) (0 vs 0), while Castor has a higher Absolute Magnitude (1 vs 0 mag).
Brightness
2
Apparent Magnitude
3
1
Absolute Magnitude
0
49
Luminosity
70
Physical Properties
51
Distance
99
9,720
Surface Temperature
8,486
0
Color Index (B-V)
0
Position
8
Right Ascension
1
32
Declination
60
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Data sourced from HYG Database (Free for any purpose, including commercial).