Bellatrix (γ Orionis)

Location of γ Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Pronunciation /ˈbɛlətrɪks/
Right ascension 05
Declination +06° 20′ 58.9318″
Apparent magnitude (V) 1.64
Characteristics
Spectral type B2 III
U−B color index –0.86
B−V color index –0.21
Variable type Eruptive
Astrometry
Radial velocity (Rv) +18.2 km/s
Proper motion (μ) RA: –8.11 mas/yr
Parallax (π) 12.92 ± 0.52mas
Distance 250 ± 10 ly
(77 ± 3 pc)
Details
Mass 8.4+0.3
−0.1
M
Radius 6R
Luminosity ~6,400L
Surface gravity (log g) 3.60
Temperature 22,000K
Metallicity [Fe/H] –0.25dex
Rotational velocity (v sin i) 46 ± 8 km/s
Age 20+2
−4
Myr
Other designations
Bellatrix, γ Orionis, Amazon Star, warrioress, 24 Ori, Al Najid, HR 1790, BD +06°919, HD 35468, SAO 112740, FK5 201, HIP 25336.

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Bellatrix, which is released under the Creative Commons Attribution-Share-Alike License 3.0