CastorvsMeleph
Castor has a higher Absolute Magnitude (1 vs 0 mag), while Meleph has a higher Distance (587 vs 51 light-years), while Meleph has a higher Color Index (B-V) (0 vs 0).
Brightness
2
Apparent Magnitude
6
1
Absolute Magnitude
0
49
Luminosity
86
Physical Properties
51
Distance
587
9,720
Surface Temperature
8,403
0
Color Index (B-V)
0
Position
8
Right Ascension
9
32
Declination
20
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Data sourced from HYG Database (Free for any purpose, including commercial).