Zubenelgenubi is a complex system comprising a pair of binarystars: both Alpha1 and Alpha2Librae are spectroscopic binary systems. These two systems evidently shared a common origin and display similar proper motion, travelling through space at a distance of some 5,400 AU apart. There is potentionally another, much more distant, associated star in KU Librae, which also shows proper motion equivalent to the Alpha stars.
The fainter fifth-magnitudestar close to Zubenelgenubi to the northwest is Alpha1Librae. Traditionally the name Zubenelgenubi was often shared by these stars as a pair, but the name is now formally applied only to Alpha2Librae. The two stars do not form a binary system, but they are related; they evidently shared a common origin, and follow similar paths through the Galaxy. Imagery provided by Aladin sky atlas