Castor BvsFafnir
Castor B has a higher Absolute Magnitude (2 vs 0 mag), while Fafnir has a higher Distance (315 vs 52 light-years), while Fafnir has a higher Luminosity (96 vs 16 × Sun).
Brightness
3
Apparent Magnitude
5
2
Absolute Magnitude
0
16
Luminosity
96
Physical Properties
52
Distance
315
N/A
Surface Temperature
4,350
N/A
Color Index (B-V)
1
Position
8
Right Ascension
18
32
Declination
66
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Data sourced from HYG Database (Free for any purpose, including commercial).