CastorvsZhang
Castor has a higher Absolute Magnitude (1 vs 0 mag), while Castor has a higher Declination (32 vs -15 °), while Zhang has a higher Color Index (B-V) (1 vs 0).
Brightness
2
Apparent Magnitude
4
1
Absolute Magnitude
0
49
Luminosity
129
Physical Properties
51
Distance
264
9,720
Surface Temperature
4,949
0
Color Index (B-V)
1
Position
8
Right Ascension
10
32
Declination
-15
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Data sourced from HYG Database (Free for any purpose, including commercial).