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Mu1 Gruis
Star in the constellation Grus From Wikipedia, the free encyclopedia
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Mu1 Gruis, Latinized from μ1 Gruis, is a binary star[3] system in the southern constellation of Grus. It is visible to the naked eye with a combined apparent visual magnitude of 4.79.[2] The distance to this system, as determined using an annual parallax shift of 11.44 mas as seen from the Earth,[8] is around 275 light years. It is drifting closer with a heliocentric radial velocity of −5 km/s.[1]
The pair orbit each other with a period of 19 years and an eccentricity of 0.56.[6] The yellow-hued primary component is an evolved giant star with stellar classification of G III[4] and visual magnitude 5.20.[3] With the supply of hydrogen at its core exhausted, it cooled and expanded; at present it has nine[1] times the girth of the Sun. The star is radiating 67 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,422 K.[1]
The secondary component is magnitude 6.68 and classed as a G-type star,[3] although its color index and absolute magnitude suggest it is of type A6.[6]
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