AchernarvsCygnus X-1
Cygnus X-1 has a higher Declination (35 vs -57 °), while Cygnus X-1 has a higher Color Index (B-V) (1 vs 0), while Cygnus X-1 has a higher Absolute Magnitude (0 vs -3 mag).
Brightness
0
Apparent Magnitude
9
-3
Absolute Magnitude
0
1,052
Luminosity
90
Physical Properties
139
Distance
1,941
12,650
Surface Temperature
5,501
0
Color Index (B-V)
1
Position
2
Right Ascension
20
-57
Declination
35
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Data sourced from HYG Database (Free for any purpose, including commercial).