AsteropevsCastor
Castor has a higher Color Index (B-V) (0 vs 0), while Asterope has a higher Distance (372 vs 51 light-years), while Asterope has a higher Apparent Magnitude (6 vs 2 mag).
Brightness
6
Apparent Magnitude
2
0
Absolute Magnitude
1
56
Luminosity
49
Physical Properties
372
Distance
51
10,598
Surface Temperature
9,720
0
Color Index (B-V)
0
Position
4
Right Ascension
8
25
Declination
32
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Data sourced from HYG Database (Free for any purpose, including commercial).