Zeta Corvi
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 20m 33.64200s |
| Declination | −22° 12′ 57.2410″ |
| Apparent magnitude (V) | 5.21 |
| Characteristics | |
| Evolutionary stage | Be star |
| Spectral type | B8V |
| U−B color index | −0.39 |
| B−V color index | −0.11 |
| Astrometry | |
| Radial velocity (Rv) | −6.40±4.2 km/s |
| Proper motion (μ) | RA: −108.97 mas/yr Dec.: −27.31 mas/yr |
| Parallax (π) | 7.85±0.22 mas |
| Distance | 420 ± 10 ly (127 ± 4 pc) |
| Absolute magnitude (MV) | −0.32 |
| Details | |
| Mass | 3.39±0.04 M☉ |
| Radius | 4.57±0.09 R☉ |
| Luminosity | 200 L☉ |
| Surface gravity (log g) | 2.26±0.02 cgs |
| Temperature | 11,561 K |
| Rotational velocity (v sin i) | 259 km/s |
| Other designations | |
| ζ Crv, 5 Crv, BD−21°3514, HD 107348, HIP 60189, HR 4696, SAO 180700 | |
| Database references | |
| SIMBAD | data |
Zeta Corvi, Latinised from ζ Corvi, is a star in the constellation Corvus. It is a blue-white main-sequence star of apparent magnitude 5.21. Around 420 light-years distant, it shines with a luminosity approximately 154 times that of the Sun and has a surface temperature of 10,695 K. It is a Be star, the presence of hydrogen emission lines in its spectrum indicating it has a circumstellar disk. It is separated by 7 arcminutes from the star HR 4691. The two may be an optical double or a true multiple star system, with a separation of at least 50,000 astronomical units and the stars taking 3.5 million years to orbit each other. HR 4691 is itself double, composed of an ageing yellow-orange giant whose spectral type has been calculated at K0 or G3, and an F-type main-sequence star.
In Chinese astronomy, this star is named Changsha (simplified Chinese: 长沙; traditional Chinese: 長沙). This was translated by R. H. Allen as "a Long Sand-bank", but according to Ian Ridpath it represents a coffin. Changsha is the capital of Hunan province in China.