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The O5 spectral type is within the O-class, specifically, stars with a surface temperature of around 45000 K. Characteristics of main-sequence O5 stars:
12 | radius(solar) |
60 | mass(solar) |
-5.7 | absolute magnitude(visual) |
790,000 | bolometric luminosity(solar) |
3,000,000 years | lifetime |
0.00001% | abundance of all O-type stars |
O5 was the earliest defined spectral type until the 1970s.