Theta Ursae Majoris

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Theta Ursae Majoris A/B
Observation data
Epoch J2000
Constellation
(pronunciation)		 Ursa Major
Right ascension 09h 32m 51.4s
Declination +51° 40′ 38″
Apparent magnitude (V) 3.17
Characteristics
Spectral type F6 IV/M6
U-B color index 0.03
B-V color index 0.46
Variable type Suspected
Astrometry
Radial velocity (Rv) 14.7 km/s
Proper motion (μ) RA: -947.06 mas/yr
Dec.: -535.6 mas/yr
Parallax (π) 74.15 ± 0.74 mas
Distance 44 ± 0.4 ly
(13.5 ± 0.1 pc)
Absolute magnitude (MV) 2.52
Details
Mass 1.5-1.6 M☉
Radius ? R☉
Luminosity 7.6 L☉
Temperature 6,400 K
Metallicity 60%
Rotation 12 km/s.
Age 3 × 109 years
Other designations
Al Haud, Sarir, 25 Ursae Majoris, Gl 354, HR 3775, BD +52°1401, HD 82328, LHS 270, LTT 12519, GCTP 2266.00, SAO 27289, FK5 358, GC 13157, ADS 7420, CCDM 09329+5141, HIP 46853.

Theta Ursae Majoris (θ UMa / θ Ursae Majoris) is a binary star in the constellation Ursa Major. It is approximately 44.0 light years from Earth. It also has the traditional names Al Haud and Sarir.

The primary component, Theta Ursae Majoris A, is a yellow-white F-type subgiant with an apparent magnitude of +3.17. The 14th magnitude companion star is 4.1 arcseconds away from the primary.

[edit] External links

[edit] See also

  • Sarir - a medieval state
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