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Gamma Corvi
Star in the constellation of Corvus / From Wikipedia, the free encyclopedia
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Gamma Corvi (γ Corvi, abbreviated Gamma Crv, γ Crv) is a binary star and the brightest star in the southern constellation of Corvus, having an apparent visual magnitude of 2.59.[12] The system's two components are designated Gamma Corvi A (officially named Gienah /ˈdʒiːnə/, traditionally the name of the system)[13][14] and Gamma Corvi B, whose magnitude is 9.7 and which is 1.1 arcseconds away from Gamma Corvi A.[15] The distance to this system has been measured directly using the parallax technique, yielding an estimated 154 light-years (47 parsecs) from the Sun.[1]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corvus |
Right ascension | 12h 15m 48.37081s[1] |
Declination | –17° 32′ 30.9496″[1] |
Apparent magnitude (V) | 2.585[2] |
Characteristics | |
Spectral type | B8 III[3] |
U−B color index | –0.344[2] |
B−V color index | –0.111[2] |
Astrometry | |
Radial velocity (Rv) | -4.2[4] km/s |
Proper motion (μ) | RA: –158.61[1] mas/yr Dec.: +21.86[1] mas/yr |
Parallax (π) | 21.23 ± 0.20 mas[1] |
Distance | 154 ± 1 ly (47.1 ± 0.4 pc) |
Absolute magnitude (MV) | −0.79[5] |
Details | |
γ Crv A | |
Mass | 4.2+0.4 −0.3[6] M☉ |
Radius | 4.026[7][lower-alpha 1] R☉ |
Luminosity | 331[5] L☉ |
Temperature | 12,000[8] K |
Rotational velocity (v sin i) | 30[9] km/s |
Age | 160+40 −30[6] Myr |
γ Crv B | |
Mass | 0.8[10] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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