CastorvsTianyi
Castor has a higher Absolute Magnitude (1 vs -1 mag), while Tianyi has a higher Color Index (B-V) (2 vs 0), while Tianyi has a higher Distance (741 vs 51 light-years).
Brightness
2
Apparent Magnitude
5
1
Absolute Magnitude
-1
49
Luminosity
303
Physical Properties
51
Distance
741
9,720
Surface Temperature
3,695
0
Color Index (B-V)
2
Position
8
Right Ascension
13
32
Declination
67
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Data sourced from HYG Database (Free for any purpose, including commercial).