AlcorvsCastor
Alcor has a higher Color Index (B-V) (0 vs 0), while Castor has a higher Luminosity (49 vs 14 × Sun), while Alcor has a higher Absolute Magnitude (2 vs 1 mag).
Brightness
4
Apparent Magnitude
2
2
Absolute Magnitude
1
14
Luminosity
49
Physical Properties
82
Distance
51
8,411
Surface Temperature
9,720
0
Color Index (B-V)
0
Position
13
Right Ascension
8
55
Declination
32
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Data sourced from HYG Database (Free for any purpose, including commercial).