CastorvsDiadem
Diadem has a higher Color Index (B-V) (0 vs 0), while Castor has a higher Luminosity (49 vs 5 × Sun), while Diadem has a higher Absolute Magnitude (3 vs 1 mag).
Brightness
2
Apparent Magnitude
4
1
Absolute Magnitude
3
49
Luminosity
5
Physical Properties
51
Distance
58
9,720
Surface Temperature
6,600
0
Color Index (B-V)
0
Position
8
Right Ascension
13
32
Declination
18
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Data sourced from HYG Database (Free for any purpose, including commercial).