Epsilon Ursae Majoris or Alioth is a white star in the Ursa Major constellation.
Quick facts Observation data Epoch J2000 Equinox J2000, Constellation ...
ε Ursae Majoris
ε Ursae Majoris in Ursa Major (circled). |
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 |
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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] |
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Details |
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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 |
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Other designations |
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Alioth, Allioth, Aliath, ε UMa, 77 Ursae Majoris, BD+56°1627, FK5 483, GC 17518, HD 112185, HIP 62956, HR 4905, PPM 33769, SAO 28553. |
Database references |
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SIMBAD | data |
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