With a well-defined orbit, Gamma Coronae Australis B goes around Gamma A (at the cross) every 122 years (in reality both orbiting a common center of mass roughly halfway between them) averaging some 33 AU apart. Unfortunately the distance to the system is not all that well known, so the results are a bit problematic. (From the Sixth Catalog of Orbits of Visual Binary Stars , W. I. Hartkopf and B. D. Mason, US Naval Observatory Double Star Catalog, 2006.) |