Mu Ursae Majoris

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Mu Ursae Majoris (μ UMa / μ Ursae Majoris) is a star in the constellation Ursa Major. It also has the traditional names Tania Australis, and Alkafzah Australis.

Mu Ursae Majoris is a M-type red giant with a mean apparent magnitude of +3.06. It is approximately 249 light years from Earth. It is classified as a Semiregular variable star and its brightness varies from magnitude +2.99 to +3.33.

Spectroscopically it has been determined that this is a double star with a companion a mere 1.5 AU from the primary with a rotation period of 230 days.

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