AlsephinavsCastor
Castor has a higher Declination (32 vs -55 °), while Castor has a higher Absolute Magnitude (1 vs 0 mag), while Alsephina has a higher Luminosity (90 vs 49 × Sun).
Brightness
2
Apparent Magnitude
2
0
Absolute Magnitude
1
90
Luminosity
49
Physical Properties
81
Distance
51
9,619
Surface Temperature
9,720
0
Color Index (B-V)
0
Position
9
Right Ascension
8
-55
Declination
32
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Data sourced from HYG Database (Free for any purpose, including commercial).