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.
M Car exhibits stellar characteristics of kA8 mF4 III, suggesting calcium K-line emission from an A8 star and metallic lines indicative of a F-type giant nearing hydrogen exhaustion at its core. Currently, M Car's mass is roughly 2.14 times that of the Sun but has expanded to 4.45 times its original diameter.