HD 24071
HD 24071 and HD 24072 form a binary or possibly a triple star system in the equatorial constellation of Eridanus. It is visible to the naked eye, with component HD 24071 having an apparent visual magnitude of 5.25 and HD 24072 a magnitude of 4.72. As of 2009, the pair had an angular separation of along a position angle of 216°. The annual parallax shift of HD 24071 is, which provides a distance estimate to the system of 172 light years. The pair are members of the Tucana-Horologium moving group, a 45 million year old set of stars that share a common motion through space.
HD 24071 is an A-type main-sequence star with a stellar classification of A1 Va. It is a suspected variable star of unknown type showing an amplitude of 0.05 magnitude, and is a source of X-ray emission, which may originate from a companion of class G2-5V. The brighter component, HD 24072, is a B-type main-sequence star with a classification of B9.5 Van. The n suffix indicates "nebulous" absorption lines due to rapid rotation. It has a projected rotational velocity of 225 km/s.
