Tau Ursae Majoris

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Tau Ursae Majoris
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings
Cercle rouge 100%.svg

Location of τ Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 09h 10m 55.1s
Declination +63° 30' 49"
Apparent magnitude (V) +4.67
Distance 122 ± 3 ly
(37 ± 1 pc)
Spectral type F3-4IIIm
Other designations
τ Ursae Majoris, τ UMa, Tau UMa, 14 Ursae Majoris, BD+64 723A, CCDM J09110+6331A, FK5 2727, GC 12646, HD 78362, HIP 45075, HR 3624, IDS 09027+6355 A, PPM 16936, SAO 14796, WDS J09109+6331A.

Tau Ursae Majoris (Tau UMa, τ Ursae Majoris, τ UMa) is a binary star in the constellation Ursa Major. It is approximately 122 light years from Earth.

Tau Ursae Majoris is a spectroscopic binary which is classified as a yellow-white F-type giant with an apparent magnitude of +4.67. The binary system completes one orbit every 1062 days.

With φ, h, υ, θ, e, and f, it composed the Arabic asterism Sarīr Banāt al-Na'sh, the Throne of the daughters of Na'sh, and al-Haud, the Pond,[1]


  1. ^ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 442