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Tau Orionis
Observation data
Epoch {{{epoch}}}      Equinox
Constellation Orion
Right ascension 05h 17m 08.28s
Declination −06° 50′ 39.8″
Apparent magnitude (V) 3.59

Spectral type B5III
Distance 555 ly
Other designations
HD 34503, HIP 24674, SAO 131952, BD B-07 1028

Tau Orionis (τ Ori, τ Orionis) is a star in the constellation Orion.

This star, along with β Eri, λ Eri and ψ Eri were Al Kursiyy al Jauzah, "the Chair (or "Footstool") of the Central One"[1]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kursiyy al Jauzah were the title for three stars: β Eri as Cursa, ψ Eri as Al Kursiyy al Jauzah I and λ Eri as Al Kursiyy al Jauzah II (exclude this star)[2]

In Chinese, 玉井 (Yù Jǐng), meaning Jade Well, refers to an asterism consisting of τ Orionis, β Eridani, λ Eridani and ψ Eridani.[3] Consequently, τ Orionis itself is known as 玉井四 (Yù Jǐng sì, English: the Fourth Star of Jade Well.).[4] From this Chinese name, the name Yuh Tsing was appeared[5]


Tau Orionis has an apparent magnitude of 3.59, meaning it is visible to the naked eye, and belongs to the spectral class B5III. If an imaginary line is drawn north-west between the stars Rigel and Mintaka, Tau Orionis can be found roughly one-sixth of the way to Mintaka.


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Tau_Orionis — Please support Wikipedia.
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