BunavsCastor
Buna has a higher Color Index (B-V) (1 vs 0), while Castor has a higher Luminosity (49 vs 4 × Sun), while Buna has a higher Absolute Magnitude (3 vs 1 mag).
Brightness
7
Apparent Magnitude
2
3
Absolute Magnitude
1
4
Luminosity
49
Physical Properties
189
Distance
51
5,757
Surface Temperature
9,720
1
Color Index (B-V)
0
Position
3
Right Ascension
8
42
Declination
32
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Data sourced from HYG Database (Free for any purpose, including commercial).