Mu Columbae

Mu Columbae (also known as μ Col or μ Columbae) is a main sequence star in the constellation of Columba. It is one of the few O-class stars that are visible to the naked eye. The star is known to be located about 1,300 light years from the Solar System (with an error margin of a few hundred light years).

This is a relatively fast rotating star that completes a full revolution about every 1.5 days. (Compare this to the Sun, which at only 22% of this star's diameter rotates only once every 25.4 days.) This rate of rotation is fairly usual for stars of this class.

Based on measurements of proper motion and radial velocity, astronomers know that this star and AE Aurigae are moving away from each other at a relative velocity of over 200 km/s. Their common point of origin connects with Iota Orionis in the Trapezium cluster, some two and half million years in the past. The most likely scenario that could have created these runaway stars is a collision between two binary star systems, with the stars being ejected along different trajectories radial to the point of intersection.