CastorvsNekkar
Castor has a higher Absolute Magnitude (1 vs -1 mag), while Nekkar has a higher Color Index (B-V) (1 vs 0), while Nekkar has a higher Distance (225 vs 51 light-years).
Brightness
2
Apparent Magnitude
3
1
Absolute Magnitude
-1
49
Luminosity
167
Physical Properties
51
Distance
225
9,720
Surface Temperature
4,851
0
Color Index (B-V)
1
Position
8
Right Ascension
15
32
Declination
40
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Data sourced from HYG Database (Free for any purpose, including commercial).