Omicron Ursae Majoris
Omicron Ursae Majoris (ο Ursae Majoris, abbreviated Omicron UMa, ο UMa), formally named Muscida /ˈmjuːsɪdə/, is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.35 and is located at a distance of around 179 light-years (55 parsecs) from the Sun. In 2012, an exoplanet designated Omicron Ursae Majoris Ab was found to be orbiting the primary.
Location of ο Ursa Major (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 08h 30m 15.87064s |
| Declination | +60° 43′ 05.4115″ |
| Apparent magnitude (V) | +3.35 |
| Characteristics | |
| Spectral type | G5III: |
| U−B color index | +0.52 |
| B−V color index | +0.85 |
| Astrometry | |
| Radial velocity (Rv) | +19.8 km/s |
| Proper motion (μ) | RA: -133.644 mas/yr Dec.: -107.664 mas/yr |
| Parallax (π) | 17.9335 ± 0.1456 mas |
| Distance | 182 ± 1 ly (55.8 ± 0.5 pc) |
| Absolute magnitude (MV) | –0.40 |
| Details | |
| Mass | 3.09 M☉ |
| Radius | 14 R☉ |
| Luminosity | 138 L☉ |
| Surface gravity (log g) | 2.64 cgs |
| Temperature | 5,242 K |
| Metallicity [Fe/H] | –0.09 dex |
| Rotational velocity (v sin i) | 3.83 km/s |
| Age | 360 ± 30 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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