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