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Sigma1 Gruis

Star in the constellation Grus From Wikipedia, the free encyclopedia

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Sigma1 Gruis, a Latinization of σ1 Gruis, is a star in the constellation Grus. It is a dim, white-hued star near the lower limit for visibility to the naked eye with an apparent visual magnitude of 6.26.[2] This object is located 229 light-years (70.1 pc) distant from the Sun based on parallax.[1] The radial velocity of this star is poorly constrained, but it appears to be drifting further away at the rate of +7 km/s.[3]

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This is an A-type main-sequence star with a stellar classification of A2 Vn; a star that is currently fusing its core hydrogen. It has a relatively high rate of spin as indicated by the 'n' suffix, showing a projected rotational velocity of 163 km/s.[8] This object is 194 million years old with double the mass[6] and radius of the Sun.[7] The star is radiating 12[5] times the luminosity of the Sun from its photosphere at an effective temperature of 9,230 K.[6] It is a source of X-ray emission, which may indicate it has an unseen stellar companion.[10]

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