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]

ζ Corvi

Location of ζ Corvi (circled)
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
5 Corvi, ζ Crv, ζ Corvi, BD–21° 3514, HD 107348, HIP 60189, HR 4696, SAO 180700
Database references
SIMBAD	data

References

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[ru] Дзета Ворона