CastorvsSpica
Castor has a higher Declination (32 vs -11 °), while Castor has a higher Absolute Magnitude (1 vs -3 mag), while Castor has a higher Color Index (B-V) (0 vs 0).
Brightness
2
Apparent Magnitude
1
1
Absolute Magnitude
-3
49
Luminosity
2,070
Physical Properties
51
Distance
250
9,720
Surface Temperature
14,492
0
Color Index (B-V)
0
Position
8
Right Ascension
13
32
Declination
-11
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Data sourced from HYG Database (Free for any purpose, including commercial).