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| Bellatrix - The Blue Super Giant! |
Bellatrix, also designated Gamma Orionis is the third-brightest star in the constellation of Orion, 5° west of the red giant Alpha Orionis (Betelgeuse).
Just between the first and second magnitude and slightly variable, it is about the 25th-brightest star in the night sky.
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| Sun's Comparison With Bellatrix |
Bellatrix is a massive star with about 8.6 times the Sun's mass. It has an estimated age of approximately 25 million years—old enough for a star of this mass to consume the hydrogen at its core and begin to evolve away from the main sequence into a giant star. The effective temperature of the outer envelope of this star is 22000 K, which is considerably hotter than the 5,778 K on the Sun. This high temperature gives this star the blue-white hue that occurs with B-type stars. The measured angular diameter of this star, after correction for limb darkening, is 0.72±0.04 mas. At an estimated distance of 250 light-years, this yields a physical size of about six times the radius of the Sun.
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