Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Pronunciation /ˈbɛlətrɪks/
Right ascension 05h 25m 07.86325s[1]
Declination +06° 20′ 58.9318″[1]
Apparent magnitude (V) 1.64[2]
Characteristics
Spectral type B2 III[3]
U−B color index –0.86[2]
B−V color index –0.21[2]
Variable type Eruptive[citation needed]
Astrometry
Radial velocity (Rv) +18.2[4] km/s
Proper motion (μ) RA: –8.11[1] mas/yr
Dec.: –12.88[1] mas/yr
Parallax (π) 12.92 ± 0.52[1] mas
Distance 250 ± 10 ly
(77 ± 3 pc)
Details
Mass 8.4+0.3
−0.1[5] M
Radius 6[6] R
Luminosity ~6,400[7] L
Surface gravity (log g) 3.60[8] cgs
Temperature 22,000[8] K
Metallicity [Fe/H] –0.25[9] dex
Rotational velocity (v sin i) 46 ± 8[8] km/s
Age 20+2
−4[5] Myr
Other designations
Bellatrix, γ Orionis, Amazon Star, warrioress, 24 Ori, Al Najid, HR 1790, BD +06°919, HD 35468, SAO112740, FK5 201, HIP 25336.[10]