CastorvsMesarthim
Castor has a higher Color Index (B-V) (0 vs 0), while Castor has a higher Right Ascension (8 vs 2 h), while Mesarthim has a higher Distance (164 vs 51 light-years).
Brightness
2
Apparent Magnitude
4
1
Absolute Magnitude
0
49
Luminosity
62
Physical Properties
51
Distance
164
9,720
Surface Temperature
10,752
0
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).