 The age of the star was estimated by calculating the amount of lithium present in the star, which is rapidly burned up once nuclear fusion ignites.AP Columbae is classified as a red dwarf of the spectral class M4.5 with an estimated surface temperature of 3250 K. It has not evolved into a main sequence star yet and is still in the pre-main-sequence stage.The star is almost surely single—direct imaging indicated that any stellar companion would be less than 50 milliarcseconds distant, and the radial velocity variations induced by so close a companion would be much larger than the observed ones.