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4 Ursae Majoris
Pi² Ursae Majoris (Pi² UMa, π² Ursae Majoris, π² UMa), also known as 4 Ursae Majoris (sometimes abbreviated 4 Uma) or traditionally named Muscida, is the Bayer designation for a star in the northern circumpolar constellation of Ursa Major. With an apparent visual magnitude of +4.6,〔 this star is visible from suburban or darker skies based upon the Bortle Dark-Sky Scale. From parallax measurements made during the Hipparcos mission, this star is at a distance of from Earth.〔 , one extrasolar planet has been confirmed to be orbiting the star.
==Properties==
This star has a stellar classification of K2 III,〔 indicating that, at an estimated age of around four billion years,〔 it is an evolved star that has reached the giant stage. It has a mass about 1.2 times larger than the Sun, but has expanded to 18 times the Sun's girth.〔 The effective temperature of the star's outer atmosphere is 4,415 K.〔 This heat gives it the cool, orange-hued glow of a K-type star.〔
Pi² Ursae Majoris is a member of the Milky Way galaxy's thin disk population. It is following an orbit through the galaxy with an eccentricity of 0.10, which carries it as close to the Galactic Center as and as far as . The inclination of this orbit lies close to the galactic plane, so it departs this plane by no more than
.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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