Theta Ursae Majoris
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | 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 | |
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
- Theta Ursae Majoris by Professor Jim Kaler.
[edit] See also
- Sarir - a medival state
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