Zeta Crucis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 18m 26.24075s |
| Declination | −64° 00′ 11.1073″ |
| Apparent magnitude (V) | 4.04 |
| Characteristics | |
| Spectral type | B2.5V |
| U−B color index | –0.68 |
| B−V color index | –0.17 |
| Astrometry | |
| Radial velocity (Rv) | +15.8 km/s |
| Proper motion (μ) | RA: −37.431 mas/yr Dec.: −6.576 mas/yr |
| Parallax (π) | 9.2402±0.1928 mas |
| Distance | 353 ± 7 ly (108 ± 2 pc) |
| Absolute magnitude (MV) | −1.13 |
| Details | |
| Mass | 6.4±0.1 M☉ |
| Radius | 3.7 R☉ |
| Luminosity | 737 L☉ |
| Temperature | 3,832 K |
| Rotational velocity (v sin i) | 115 km/s |
| Age | 20.0±4.3 Myr |
| Other designations | |
| ζ Cru, CPD−63°2235, HD 106983, HIP 60009, HR 4679, SAO 251841 | |
| Database references | |
| SIMBAD | data |
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 4.06m. 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.
This is a double-lined spectroscopic binary star system. 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.