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Upsilon Orionis (υ Ori, υ Orionis) is a star in the constellation Orion. It has the traditional name Thabit or Tabit (ﺛﺎﺑﺖ, Arabic language 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.
In a 1981 paper, Thabit was observed to have nonradial pulsations over a period of around 12 hours, and has been classified as a slowly pulsating B star. Subsequent review of Hipparcos data indicated it was most likely a Beta Cephei variable, and is hence considered a candidate for that class. These are blue-white main sequence stars of around 10 to 20 times the mass of the Sun that pulsate with periods of 0.1 to 0.3 days; their changes in magnitude are much more pronounced in the ultraviolet than in the visual spectrum. It is classified as a Beta Cephei variable by the American Association of Variable Star Observers, and has an apparent magnitude of +4.62.
Thabit's Stellar parallax has been measured at , yielding a distance of approximately 1,325 from Earth. Spectroscopy observations found it to be 1,260 distant, with a radius 5.5 and a luminosity 32,000 that of the Sun, an effective temperature of 32,900 Kelvin and a mass 17.5 that of the Sun. It is one of the most massive stars of the Orion OB1c association (in Orion's Sword).
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