CastorvsMarsic B
Castor has a higher Absolute Magnitude (1 vs -3 mag), while Marsic B has a higher Distance (2,104 vs 51 light-years), while Marsic B has a higher Color Index (B-V) (1 vs 0).
Brightness
2
Apparent Magnitude
6
1
Absolute Magnitude
-3
49
Luminosity
1,146
Physical Properties
51
Distance
2,104
9,720
Surface Temperature
4,430
0
Color Index (B-V)
1
Position
8
Right Ascension
16
32
Declination
17
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Data sourced from HYG Database (Free for any purpose, including commercial).