Back Bellatrix Afrikaans المرزم (نجم) Arabic Bellatrix AST Белатрыкс Byelorussian Белатрикс Bulgarian কার্তিকেয় (তারা) Bengali/Bangla Bellatrix Catalan Bellatrix Czech Bellatrix Danish Bellatrix German

Bellatrix

For other uses, see Bellatrix (disambiguation).
Bellatrix
Location of γ Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Pronunciation /ˈbɛlətrɪks/ /bɛˈleɪtrɪks/[1]
Right ascension 05h 25m 07.86325s[2]
Declination +06° 20′ 58.9318″[2]
Apparent magnitude (V) 1.64[3] (1.59 - 1.64[4])
Characteristics
Spectral type B2 III[5] or B2V[6]
U−B color index −0.86[3]
B−V color index −0.21[3]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)+18.2[7] km/s
Proper motion (μ) RA: −8.11[2] mas/yr
Dec.: −12.88[2] mas/yr
Parallax (π)12.92 ± 0.52 mas[2]
Distance250 ± 10 ly
(77 ± 3 pc)
Absolute magnitude (MV)−2.78[8]
Details
Mass7.7[9] M☉
Radius5.75[9] R☉
Luminosity9,211[9] L☉
Surface gravity (log g)3.60[10] cgs
Temperature21,800[9] K
Metallicity [Fe/H]−0.07[9] dex
Rotational velocity (v sin i)52[11] km/s
Age25.2[12] Myr
Other designations
Bellatrix, BenAnna[13], Al Najīd[14], Amazon Star[14], γ Orionis, Gamma Ori, γ Ori, 24 Ori, NSV 1972, BD+06°919, FK5 201, HD 35468, HIP 25336, HR 1790, SAO 112740[15]
Database references
SIMBADdata

Bellatrix is the third-brightest star in the constellation of Orion, positioned 5° west of the red supergiant Betelgeuse (Alpha Orionis). It has the Bayer designation γ Orionis, which is Latinized to Gamma Orionis. With a slightly variable magnitude of around 1.6, it is typically the 25th-brightest star in the night sky. Located at a distance of 250±10 light-years from the Sun, it is a blue giant star around 7.7 times as massive as the sun with 5.75 times its diameter.

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  13. ^ "Starling Star Registry".
  14. ^ a b Cite error: The named reference allen1963 was invoked but never defined (see the help page).
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