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]
Distance1258±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 3000 light-years distant from the Solar System. It is a suspected Beta Cephei variable.

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  2. ^ a b c d e Cite error: The named reference AAA550_A26 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference gosss2016 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gosss was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference AAVSOups was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference quantitative was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference tetzlaff2011 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Rumrill was invoked but never defined (see the help page).


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