CastorvsNembus
Castor has a higher Absolute Magnitude (1 vs 0 mag), while Nembus has a higher Color Index (B-V) (1 vs 0), while Castor has a higher Right Ascension (8 vs 2 h).
Brightness
2
Apparent Magnitude
4
1
Absolute Magnitude
0
49
Luminosity
94
Physical Properties
51
Distance
177
9,720
Surface Temperature
4,167
0
Color Index (B-V)
1
Position
8
Right Ascension
2
32
Declination
49
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Data sourced from HYG Database (Free for any purpose, including commercial).