This is a spectroscopic binary star system with a companion a mere 0.2 AU from the primary, assuming a distance of 71 parsecs, with an orbital period of 230 days.

TODO

Look at the following paper and confirm the distance is 0.2 AU. Other sources give a larger distance. See desigation HIP 50801. https://iopscience.iop.org/article/10.1088/0004-6256/145/3/81

binary star of

Tania Australis

citation

Wikipedia contributors. (2024, July 21). Mu Ursae Majoris. In Wikipedia, The Free Encyclopedia. Retrieved August 2, 2024, from https://en.wikipedia.org/w/index.php?title=Mu_Ursae_Majoris&oldid=1235876804

note

This is closer to the star than Mercury is to the Sun (the semi-major axis of Mercury is 0.387098 AU)

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bowling

see also

Mercury (Wikipedia)

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Mu Ursae Majoris (Wikipedia) Mu Ursae Majoris (μ Ursae Majoris, abbreviated Mu UMa, μ UMa), formally named Tania Australis /ˈteɪniə ɔːˈstreɪlɪs/, is a binary star in the constellation of Ursa Major. An apparent visual magnitude of +3.06 places it among the brighter members of the constellation.

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