Back Upsilon Orionis AST Ypsilon Orionis German Upsilon Orionis Spanish اوپسیلون شکارچی Persian Upsilon Orionis French Upsilon Orionis ID Upsilon Orionis Italian オリオン座ウプシロン星 Japanese Thabit (Stär) LB Thabit NDS

Upsilon Orionis

υ Orionis
Location of υ Orionis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 05h 31m 55.85996s[1]
Declination −07° 18′ 05.5359″[1]
Apparent magnitude (V) +4.618±0.013[2]
Characteristics
Spectral type B0V[3] or O9.7V[4]
U−B color index −1.068±0.008[2]
B−V color index −0.264±0.007[2]
Variable type suspected β Cep[5]
Astrometry
Radial velocity (Rv)+17.4[6] km/s
Proper motion (μ) RA: −0.704 mas/yr[1]
Dec.: −4.885 mas/yr[1]
Parallax (π)2.4567±0.1403 mas[1]
Distance1,260±75 ly
(386±23 pc)[7]
Absolute magnitude (MV)−3.45±0.09[7]
Details
Mass17.5±0.5[7] M☉
Radius5.5±0.3[7] R☉
Luminosity32,360+2,310
−2,160[7] L☉
Luminosity (visual, LV)2,050[7][a] L☉
Surface gravity (log g)4.20±0.05[7] cgs
Temperature33,400±200[2] K
Metallicity [Fe/H]+0.0018[1] dex
Rotational velocity (v sin i)20±2[2] km/s
Age4.5[8] Myr
Other designations
Thabit, υ Ori, 36 Orionis, HD 36512, HIP 25923, HR 1855, SAO 132222, BD−07°1106
Database references
SIMBADdata

Upsilon Orionis (υ Ori, υ Orionis) is a star in the constellation Orion. It has the traditional name Thabit /ˈθeɪbɪt/[9] 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.

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