Zeta1 Scorpii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 53m 59.72713s |
| Declination | −42° 21′ 43.3073″ |
| Apparent magnitude (V) | 4.705 (4.66 to 4.86) |
| Characteristics | |
| Spectral type | B1.5 Ia+ |
| U−B color index | −0.567 |
| B−V color index | +0.480 |
| Variable type | Luminous blue variable |
| Astrometry | |
| Radial velocity (Rv) | −26.0 km/s |
| Proper motion (μ) | RA: −0.094 mas/yr Dec.: −3.368 mas/yr |
| Parallax (π) | 0.5855±0.1176 mas |
| Distance | approx. 6,000 ly (approx. 1,700 pc) |
| Absolute magnitude (MV) | −8.5 |
| Details | |
| Mass | 36 to 53 M☉ |
| Radius | 159+83 −34 R☉ |
| Luminosity (bolometric) | (1.0–1.6)×106 L☉ |
| Surface gravity (log g) | 1.7 cgs |
| Temperature | 17,000–19,000 K |
| Rotational velocity (v sin i) | 60 km/s |
| Age | 6.5±0.1 Myr |
| Other designations | |
| ζ1 Sco, CD−42 11633, CPD−42 7545, GC 22730, HD 152236, HIP 82671, HR 6262, PPM 322342, SAO 227375. | |
| Database references | |
| SIMBAD | data |
Zeta1 Scorpii (Zeta1 Sco, ζ1 Scorpii, ζ1 Sco) is a binary star in the constellation of Scorpius, composed by an B-type hypergiant star as the primary, and a secondary of which little is known. It has an apparent visual magnitude which varies between 4.66 and 4.86. It is a member of the Scorpius OB1 association, and potentially of the open star cluster NGC 6231, also known as the "Northern jewel box" cluster.