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What (who) is W Ursae Majoris variable - definition
![TESS]]'' data<ref name=MAST/>](https://commons.wikimedia.org/wiki/Special:FilePath/WUMaLightCurve.png?width=200 "TESS]]'' data<ref name=MAST/>")
![TESS]]'' data<ref name=MAST/>](https://commons.wikimedia.org/wiki/Special:FilePath/EpsUMaLightCurve.png?width=200 "TESS]]'' data<ref name=MAST/>")
Epsilon Ursae Majoris is a star in the northern constellation of Ursa Major. The designation is Latinised from ε Ursae Majoris and abbreviated Epsilon UMa or ε UMa. It is officially named Alioth . Despite being designated "ε" (epsilon), it is the brightest star in the constellation and at magnitude 1.77 is the thirty-third brightest star in the sky.
It is the star in the tail of the bear closest to its body, and thus the star in the handle of the Big Dipper (or Plough) closest to the bowl. It is also a member of the large and diffuse Ursa Major moving group. Historically, the star was frequently used in celestial navigation in the maritime trade, because it is listed as one of the 57 navigational stars.
