Nearby Red Dwarf star system also known as BD +05°1668 (sometimes called Luyten 5-1668) and Gl 273. It is in Canis Minor. Named after William Luyten, who with Edwin G. Ebbighausen, first determined its high proper motion in 1935. It is at the maximum mass that a star can be fully convective (ie, the entire star has a single convection zone). It is the closest star to Procyon (1.2 ly), which would appear as -4.5 magnitude star in any of its planets skies.