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2 Ursae Majoris
Am star in the constellation Ursa Major / From Wikipedia, the free encyclopedia
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.[2]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 08h 34m 36.17989s[1] |
Declination | +65° 08′ 42.4071″[1] |
Apparent magnitude (V) | 5.47[2] |
Characteristics | |
Evolutionary stage | main sequence[3] |
Spectral type | kA3hA5mA7s[4] |
B−V color index | +0.207[2] |
Astrometry | |
Radial velocity (Rv) | −16.87±0.13[1] km/s |
Proper motion (μ) | RA: −79.362[1] mas/yr Dec.: −65.977[1] mas/yr |
Parallax (π) | 21.7823 ± 0.1487 mas[1] |
Distance | 150 ± 1 ly (45.9 ± 0.3 pc) |
Absolute magnitude (MV) | 2.12[2] |
Details | |
Mass | 1.9[5] M☉ |
Radius | 1.8[5] R☉ |
Luminosity | 11.0[5] L☉ |
Surface gravity (log g) | 4.22[5] cgs |
Temperature | 7,912[5] K |
Metallicity [Fe/H] | +0.19[6] dex |
Rotational velocity (v sin i) | 11.9[6] km/s |
Age | 560[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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