Alphecca / Gemma (Alpha Coronae Borealis) (Apr 12, 2004)
Type:
Main sequence star (Class A0)
Brightness:
2.2 mag
Distance:
75 ly
Colour:
blue-white
Luminosity (Sun = 1):
60 x
Mass (Sun = 1):
3 x
Temperature:
10,000 degrees approx.
Diameter:
5 solar radii
Notes:
Alphecca has a cooler companion, a main sequence "dwarf" that consists of about 90% solar mass.

Celestron Newton 200/1000, Nikon Coolpix 4500

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between the sizes of selected stars by clicking here.

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