Castor BvsMesarthim
Castor B has a higher Absolute Magnitude (2 vs 0 mag), while Castor B has a higher Right Ascension (8 vs 2 h), while Mesarthim has a higher Luminosity (62 vs 16 × Sun).
Brightness
3
Apparent Magnitude
4
2
Absolute Magnitude
0
16
Luminosity
62
Physical Properties
52
Distance
164
N/A
Surface Temperature
10,752
N/A
Color Index (B-V)
0
Position
8
Right Ascension
2
32
Declination
19
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Data sourced from HYG Database (Free for any purpose, including commercial).