AltairvsMesarthim
Altair has a higher Color Index (B-V) (0 vs 0), while Altair has a higher Right Ascension (20 vs 2 h), while Mesarthim has a higher Distance (164 vs 17 light-years).
Brightness
1
Apparent Magnitude
4
2
Absolute Magnitude
0
11
Luminosity
62
Physical Properties
17
Distance
164
8,004
Surface Temperature
10,752
0
Color Index (B-V)
0
Position
20
Right Ascension
2
9
Declination
19
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Data sourced from HYG Database (Free for any purpose, including commercial).