Epsilon Ursae Majoris
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Epsilon Ursae Majoris or Alioth is a white star in the Ursa Major constellation.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 12h 54m 01.74959s[1] |
Declination | +55° 57′ 35.3627″[1] |
Apparent magnitude (V) | 1.77[2] |
Characteristics | |
Spectral type | A1III-IVp kB9 |
U−B color index | +0.02[2] |
B−V color index | -0.02[2] |
Variable type | α2 CVn |
Astrometry | |
Radial velocity (Rv) | -9.3[3] km/s |
Proper motion (μ) | RA: +111.91[1] mas/yr Dec.: -8.24[1] mas/yr |
Parallax (π) | 39.51 ± 0.20[1] mas |
Distance | 82.6 ± 0.4 ly (25.3 ± 0.1 pc) |
Absolute magnitude (MV) | –0.2[4] |
Details | |
Mass | 2.91[5] M☉ |
Radius | 4.14[6] R☉ |
Luminosity | 102[7] L☉ |
Surface gravity (log g) | 3.23[8] cgs |
Temperature | 9,020[8] K |
Metallicity [Fe/H] | +0.00[4] dex |
Rotational velocity (v sin i) | 33[9] km/s |
Age | 300[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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