AlphardvsDiadem
Diadem has a higher Absolute Magnitude (3 vs -2 mag), while Diadem has a higher Declination (18 vs -9 °), while Alphard has a higher Luminosity (426 vs 5 × Sun).
Brightness
2
Apparent Magnitude
4
-2
Absolute Magnitude
3
426
Luminosity
5
Physical Properties
180
Distance
58
3,886
Surface Temperature
6,600
1
Color Index (B-V)
0
Position
9
Right Ascension
13
-9
Declination
18
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Data sourced from HYG Database (Free for any purpose, including commercial).