White star · Ursa Major

Alioth

Also known as: ε Ursae Majoris (ε UMa), HIP 62956

mag 1.883 light-years

About

Alioth (ε Ursae Majoris) is a white star of magnitude 1.8 in Ursa Major, about 83 light-years away.

Alioth is in the constellation Ursa Major.
Best evenings: around mid-May it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
Where on Earth: it is seen well, at least 10° up, from north of 24° S.
Star patterns: Big Dipper.

When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.

EyesEasy, even from town.
Binoculars (10×50)A sharp point; binoculars bring out its colour and the fainter stars around it.
Telescope (6–8 inch)Still a point of light at any magnification — stars are too far away to show a disc. Low in the sky, bright stars twinkle and flash colours.

Stars look the same in any instrument: brighter and sharper, but never bigger.

Proper name	Alioth
Designation	ε Ursae Majoris (ε UMa)
Hipparcos number	HIP 62956
Type	White star
Spectral type	A0p
Colour	WhiteB−V colour index −0.02
Magnitude	1.8The smaller the number, the brighter.
Distance	83 light-yearsThe light you see left it around 1943.
Proper motion	0.11″ per year across the sky
Constellation	Ursa Major
Right ascension (J2000)	12h 54m 01.7s
Declination (J2000)	+55° 57′ 35″