81_Ceti
81 Ceti
Star in the constellation of Cetus
81 Ceti is a star located approximately 331 light years away from the Sun in the equatorial constellation of Cetus. 81 Ceti is the Flamsteed designation for this object. It is visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of 5.65.[2] The star is drifting further away from the Earth with a heliocentric radial velocity of +9 km/s.[2]
This is an aging K-type giant star with a stellar classification of K0III,[3] having exhausted the supply of hydrogen at its core and expanded to 11[4] times the Sun's radius. It is a red clump giant,[6] which indicates it is on the horizontal branch and is generating energy from core helium fusion. The star is now 2.5 billion years old with 1.6 times the mass of the Sun.[4] It is radiating 60 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,825 K.[4]