AltairvsCastor
Altair has a higher Color Index (B-V) (0 vs 0), while Castor has a higher Luminosity (49 vs 11 × Sun), while Altair has a higher Absolute Magnitude (2 vs 1 mag).
Brightness
1
Apparent Magnitude
2
2
Absolute Magnitude
1
11
Luminosity
49
Physical Properties
17
Distance
51
8,004
Surface Temperature
9,720
0
Color Index (B-V)
0
Position
20
Right Ascension
8
9
Declination
32
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Data sourced from HYG Database (Free for any purpose, including commercial).