Bellatrix
Star in the constellation Orion / From Wikipedia, the free encyclopedia
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For other uses, see Bellatrix (disambiguation).
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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 250 ± 10 ly (77 ± 3 pc) |
Absolute magnitude (MV) | −2.78[8] |
Details | |
Mass | 7.7[9] M☉ |
Radius | 5.75[9] R☉ |
Luminosity | 9,211[9] L☉ |
Surface gravity (log g) | 3.60[10] cgs |
Temperature | 21,800[9] K |
Metallicity [Fe/H] | −0.07[9] dex |
Rotational velocity (v sin i) | 52[11] km/s |
Age | 25.2[12] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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