2 Ursae Majoris
2 Ursae Majoris (2 UMa) is an Am star in the northern circumpolar constellation of Ursa Major, located 150 light-years from the Sun. It has the Bayer designation A Ursae Majoris; 2 Ursae Majoris is the Flamsteed designation. It is visible to the naked eye as a faint white star with an apparent visual magnitude of 5.5. Currently 150 light years away, it is moving closer to the Earth with a heliocentric radial velocity of −17 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 08h 34m 36.17989s |
| Declination | +65° 08′ 42.4071″ |
| Apparent magnitude (V) | 5.47 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | kA3hA5mA7s |
| B−V color index | +0.207 |
| Astrometry | |
| Radial velocity (Rv) | −16.87±0.13 km/s |
| Proper motion (μ) | RA: −79.362 mas/yr Dec.: −65.977 mas/yr |
| Parallax (π) | 21.7823 ± 0.1487 mas |
| Distance | 150 ± 1 ly (45.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.12 |
| Details | |
| Mass | 1.9 M☉ |
| Radius | 1.8 R☉ |
| Luminosity | 11.0 L☉ |
| Surface gravity (log g) | 4.22 cgs |
| Temperature | 7,912 K |
| Metallicity [Fe/H] | +0.19 dex |
| Rotational velocity (v sin i) | 11.9 km/s |
| Age | 560 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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