Zeta Crucis

Zeta Crucis, Latinized from ζ Crucis, is a binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent magnitude of 4.06^m. ζ Crucis is located at about 350 light-years from the Sun. It is a member of the Lower Centaurus–Crux subgroup of the Scorpius–Centaurus association.^[10]

Zeta Crucis

Observation data Epoch J2000      Equinox J2000
Constellation	Crux
Right ascension	12h 18m 26.24075s[1]
Declination	−64° 00′ 11.1073″[1]
Apparent magnitude (V)	4.04[2]
Characteristics
Spectral type	B2.5V[3]
U−B color index	–0.68[2]
B−V color index	–0.17[2]
Astrometry
Radial velocity (Rv)	+15.8[4] km/s
Proper motion (μ)	RA: −37.431[1] mas/yr Dec.: −6.576[1] mas/yr
Parallax (π)	9.2402±0.1928 mas[1]
Distance	353 ± 7 ly (108 ± 2 pc)
Absolute magnitude (MV)	−1.13[5]
Details
Mass	6.4±0.1[6] M☉
Radius	3.7[1] R☉
Luminosity	737[5] L☉
Temperature	3,832[7] K
Rotational velocity (v sin i)	115[8] km/s
Age	20.0±4.3[6] Myr
Other designations
ζ Cru, CPD−63°2235, HD 106983, HIP 60009, HR 4679, SAO 251841[9]
Database references
SIMBAD	data

This is a double-lined spectroscopic binary star system.^[11] The spectrum matches a B-type main-sequence star with a stellar classification of B2.5 V. There is a faint visual companion with an apparent magnitude of 12.49.^[12]