ABSTRACT
The star α Orionis, marking the right shoulder of the Hunter in the ancient constellation figure. It is a red giant of spectral type M2Ib, apparent magnitude 0.45. At a distance of 427 light-years (parallax 0.008''), its apparent brightness arises from its high intrinsic luminosity (absolute magnitude (5.1) which is about 14 000 times that of the Sun
