Radial velocity
κ Crucis is a B3 bright supergiant (luminosity class Ia). Radial velocity variations in the spectral lines indicate that it has an unresolved companion star. It is over 100,000 times the luminosity of the sun, partly due to its higher temperature over 26,000 K, and partly to its larger size. The κ Crucis cluster has a calculated age of 11.2 million years.