Epoch J2000 Equinox J2000
Dec.: 2.03 mas/yr
(approx. 230 pc)
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 40m 45.5s |
| Declination | −01° 56′ 34″ |
| Apparent magnitude (V) | 2.0/~4/4.21 |
| Characteristics | |
| Spectral type | O9.7 Ib/O9III/B0 III-IV |
| U−B color index | −1.07 |
| B−V color index | 0.14 / ? / −0.01 |
| Astrometry | |
| Radial velocity (Rv) | 18 km/s |
| Proper motion (μ) | RA: 3.19 mas/yr Dec.: 2.03 mas/yr |
| Parallax (π) | 4.43 ± 0.64 mas |
| Distance | approx. 700 ly (approx. 230 pc) |
| Absolute magnitude (MV) | −5.25/−3/−2.8 |
| Orbit | |
| Companion | Alnitak B |
| Period (P) | 1,500 yr |
| Semi-major axis (a) | 2.728" |
| Eccentricity (e) | 0.07 |
| Inclination (i) | 72.0° |
| Longitude of the node(Ω) | 155.5° |
| Periastron epoch (T) | 2070.6 |
| Details | |
| Mass | 27/19/16 M☉ |
| Radius | 19/7.5/7.2 R☉ |
| Luminosity | 180,000/50,000/35,000 L☉ |
| Temperature | 28,000/32,500/29,000 K |
| Metallicity | ? |
| Rotation | 140 km/s / ? |
| Age | ? years |
| Other designations | |
| Database references | |
| SIMBAD | data |