CastorvsSyrma
Castor has a higher Declination (32 vs -6 °), while Syrma has a higher Color Index (B-V) (1 vs 0), while Castor has a higher Luminosity (49 vs 10 × Sun).
Brightness
2
Apparent Magnitude
4
1
Absolute Magnitude
2
49
Luminosity
10
Physical Properties
51
Distance
73
9,720
Surface Temperature
6,339
0
Color Index (B-V)
1
Position
8
Right Ascension
14
32
Declination
-6
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Data sourced from HYG Database (Free for any purpose, including commercial).