Upsilon Orionis
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 3000 light-years distant from the Solar System. It is a suspected Beta Cephei variable.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 31m 55.86019s |
| Declination | −07° 18′ 05.5371″ |
| 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: −0.10 mas/yr Dec.: −4.87 mas/yr |
| Parallax (π) | 1.14 ± 0.25 mas |
| Distance | approx. 2,900 ly (approx. 900 pc) |
| Absolute magnitude (MV) | −3.8 |
| Details | |
| Mass | 16.6 M☉ |
| Radius | 7.5 R☉ |
| Luminosity | 43,974 L☉ |
| Surface gravity (log g) | 4.30±0.05 cgs |
| Temperature | 33,400±200 K |
| Metallicity | +0.0018 |
| Rotational velocity (v sin i) | 20±2 km/s |
| Age | 4.5 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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