W Ursae Majoris [SEP] constellation
W Ursae Majoris
W Ursae Majoris (W UMa) is the variable star designation for a binary star system in the northern constellation of Ursa Major. It has an apparent visual magnitude of about 7.9, which is too faint to be seen with the naked eye. However, it can be viewed with a small telescope. Parallax measurements place it at a distance of roughly 170 light years (53 parsecs) from Earth.
In 1903, the luminosity of this system was found to vary by the German astronomers
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