CastorvsMerak
Merak has a higher Declination (56 vs 32 °), while Merak has a higher Distance (80 vs 51 light-years), while Castor has a higher Absolute Magnitude (1 vs 0 mag).
Brightness
2
Apparent Magnitude
2
1
Absolute Magnitude
0
49
Luminosity
60
Physical Properties
51
Distance
80
9,720
Surface Temperature
9,731
0
Color Index (B-V)
0
Position
8
Right Ascension
11
32
Declination
56
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Data sourced from HYG Database (Free for any purpose, including commercial).