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Star in the constellation Corvus From Wikipedia, the free encyclopedia
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.[8] 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.[9]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Corvus |
Right ascension | 12h 20m 33.64200s[1] |
Declination | −22° 12′ 57.2410″[1] |
Apparent magnitude (V) | 5.21[2] |
Characteristics | |
Evolutionary stage | Be star |
Spectral type | B8V[3] |
U−B color index | −0.39[4] |
B−V color index | −0.11[4] |
Astrometry | |
Radial velocity (Rv) | −6.40 ± 4.2[2] km/s |
Proper motion (μ) | RA: −108.97[1] mas/yr Dec.: −27.31[1] mas/yr |
Parallax (π) | 7.85 ± 0.22 mas[1] |
Distance | 420 ± 10 ly (127 ± 4 pc) |
Absolute magnitude (MV) | −0.32[5] |
Details | |
Mass | 3.39±0.04[6] M☉ |
Radius | 4.57±0.09[7] R☉ |
Luminosity | 200[6] L☉ |
Surface gravity (log g) | 2.26±0.02[7] cgs |
Temperature | 11,561[6] K |
Rotational velocity (v sin i) | 259[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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