Upsilon Orionis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 31m 55.85996s |
| Declination | −07° 18′ 05.5359″ |
| Apparent magnitude (V) | +4.618±0.013 |
| Characteristics | |
| Spectral type | B0V or O9.7V |
| U−B color index | −1.068±0.008 |
| B−V color index | −0.264±0.007 |
| Variable type | suspected β Cep |
| Astrometry | |
| Radial velocity (Rv) | +17.4 km/s |
| Proper motion (μ) | RA: −0.704 mas/yr Dec.: −4.885 mas/yr |
| Parallax (π) | 2.4567±0.1403 mas |
| Distance | 1,260±75 ly (386±23 pc) |
| Absolute magnitude (MV) | −3.45±0.09 |
| Details | |
| Mass | 17.5±0.5 M☉ |
| Radius | 5.5±0.3 R☉ |
| Luminosity | 32,360+2,310 −2,160 L☉ |
| Luminosity (visual, LV) | 2,050 L☉ |
| Surface gravity (log g) | 4.20±0.05 cgs |
| Temperature | 33,400±200 K |
| Metallicity [Fe/H] | +0.0018 dex |
| Rotational velocity (v sin i) | 20±2 km/s |
| Age | 4.5 Myr |
| Other designations | |
| Thabit, υ Ori, 36 Orionis, HD 36512, HIP 25923, HR 1855, SAO 132222, BD−07°1106 | |
| Database references | |
| SIMBAD | data |
Upsilon Orionis (υ Ori, υ Orionis) is a star in the constellation Orion. It has the traditional name Thabit /ˈθeɪbɪt/ or Tabit (ﺛﺎﺑﺖ, Arabic for "the endurer"), a name shared with Pi3 Orionis. It is a blue-white main sequence star of apparent magnitude 4.62 located over 1,300 light-years distant from the Solar System. It is a suspected Beta Cephei variable.