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Alioth

Epsilon Ursae Majoris, 77 Ursae Majoris

Proper NamesAlioth
Bayer DesignationEpsilon Ursae Majoris
Flamsteed Number77 Ursae Majoris
HR (BSC)4905
HD112185
ConstellationUrsa Major
Right Ascension12h 54m 56s
Declination+55° 50' 54"
Distance83 light years
25 parsecs
MagnitudeApparent: +1.8
Absolute: -0.3
Spectral ClassA0VpSiSr White Main Sequence Star
Optimum VisibilityMarch / April (Usually visible from northern latitudes)

Despite its 'epsilon' designation, Alioth is the brightest star in Ursa Major, with a magnitude of +1.8. This white star exhibits variability of the type demonstrated by Cor Caroli (or specifically by its Alpha2 Canum Venaticorum component): that is, Alioth's apparent brightness changes due to markings on its surface as the star rotates.

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