| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h18m 26.24772s[1] |
| Declination | –64° 00′ 11.0528″[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: −33.80[1] mas/yr Dec.: −10.15[1] mas/yr |
| Parallax (π) | 9.12 ± 0.45 mas[1] |
| Distance | 360 ± 20 ly (110 ± 5 pc) |
| Absolute magnitude (MV) | −1.13[5] |
| Details | |
| Mass | 6.4±0.1[6] M☉ |
| 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 |
Zeta Crucis, Latinized from ζ Crucis, is a binary star system in the southern constellationofCrux. It is visible to the naked eye with an apparent magnitude of 4.06m. ζ Crucis is located at about 360 light-years from the Sun. It is a member of the Lower Centaurus–Crux subgroup of the Scorpius–Centaurus association.[10]
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]
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