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Astronomy Portal to the Heavens, Deep Sky and Universe
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Star Classification |
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Star Class |
Approx. Temp. (degrees F.) |
Color |
Spectral character |
Examples |
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O |
over 55,000 |
Blue-white |
Gases strongly ionized |
Ioto Orionis |
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B |
36,000 |
Blue-white |
Strong neutral helium |
Rigel |
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A |
20,000 |
White |
Hydrogen |
Sirius |
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F |
13,500 |
Yellowish |
Hydrogen; increasing metals |
Canopus |
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G |
11,00 |
Yellow |
Metals |
Sun |
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K |
7,500 |
Orange |
More metals than hyrogen |
Arcturus |
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M |
5,500 |
Red |
Titanium oxide |
Antares |
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