CastorvsOnkaria
Castor has a higher Luminosity (49 vs 0 × Sun), while Onkaria has a higher Color Index (B-V) (2 vs 0), while Onkaria has a higher Absolute Magnitude (14 vs 1 mag).
Brightness
2
Apparent Magnitude
15
1
Absolute Magnitude
14
49
Luminosity
0
Physical Properties
51
Distance
42
9,720
Surface Temperature
3,465
0
Color Index (B-V)
2
Position
8
Right Ascension
17
32
Declination
5
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Data sourced from HYG Database (Free for any purpose, including commercial).