51 Orionis is a single[10] star in the equatorial constellation of Orion.[9] It has the Bayer designation b Orionis, while 51 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90.[2] It is located approximately 299 light-years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +88 km/s.[4]
This is an aging giant star with a stellar classification of K1III,[3] having exhausted the supply of hydrogen at its core and expanded to 19 times the Sun's radius.[1] It is four[8] billion years old with 1.11[5] times the mass of the Sun. The star is radiating 132[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,458 K.[1]
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