Epsilon Ursae Majoris

Alioth in Ursa Major (circled).
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 12
Declination +55° 57′ 35.3627″
Apparent magnitude (V) 1.77
Characteristics
Spectral type A0pCr
U−B color index +0.02
B−V color index -0.02
Variable type α2-CVn
Astrometry
Radial velocity (Rv) -9.3 km/s
Proper motion (μ) RA: +111.91 mas/yr
Parallax (π) 39.51 ± 0.20mas
Distance 82.6 ± 0.4 ly
(25.3 ± 0.1 pc)
Absolute magnitude (MV) –0.2
Details
Mass 2.91M
Radius 3.7 R
Luminosity 108 L
Surface gravity (log g) 3.5
Temperature 10,800K
Metallicity [Fe/H] +0.00dex
Rotational velocity (v sin i) 33 km/s
Other designations
Alioth, Allioth, Aliath, 77 Ursae Majoris, BD +56°1627, FK5 483, HD 112185, HIP 62956, HR 4905, GCTP 2964.00, SAO 28553.

Get more info about Alioth in Wikipedia

This article uses material from the Wikipedia article
Alioth, which is released under the Creative Commons Attribution-Share-Alike License 3.0