CastorvsErrai
Errai has a higher Color Index (B-V) (1 vs 0), while Castor has a higher Luminosity (49 vs 9 × Sun), while Errai has a higher Absolute Magnitude (2 vs 1 mag).
Brightness
2
Apparent Magnitude
3
1
Absolute Magnitude
2
49
Luminosity
9
Physical Properties
51
Distance
46
9,720
Surface Temperature
4,670
0
Color Index (B-V)
1
Position
8
Right Ascension
24
32
Declination
78
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Data sourced from HYG Database (Free for any purpose, including commercial).