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M Carinae (HD 88981) is a solitary star in the constellation Carina. It has an apparent magnitude of +5.154, making it faintly visible to the naked eye under ideal and is located approximately 310 light-years from Earth. With a heliocentric radial velocity of −15.2 km/s M Carinae is drifting closer to the Solar System.
M Car has a stellar classification of kA8 mF4 III which indicates that it has the calcium K-line and surface temperature of an A8 star and the metallic lines of an evolved F-type giant that has just exhausted hydrogen fusion at its core. At present M Car has 2.14 times the mass of the Sun but has mildly expanded to 4.45 times its girth. It shines at a luminosity almost 63 times greater than the Sun from its bloated photosphere at an effective temperature of 7,706 K, which gives it the white glow of an A-type star. M Car spins moderately at a projected rotational velocity of 60 km/s, slightly faster than most Am stars.