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Aims: I investigate the gravitational binding of a nearby common propermotion system in the young Castor moving group (tau ~ 200 Ma), formed by thebright quadruple star alpha Lib (Zubenelgenubi) and the young solar analog KULib. The system has an exceptionally wide angular separation, of about 2.6 deg,which corresponds to a projected physical separation of about 1.0 pc. Methods:I compile basic information of the system and compare its binding energy withthose of other weakly bound systems in the field, and study the physicalseparations of resolved multiple systems in Castor. Results: KU Lib has roughlythe same proper motion, parallactic distance, radial velocity, and metallicitythan the young hierarchical quadruple system alpha Lib. Besides, KU Lib alsodisplays youth features. The resemblance between these basic parameters and therelatively large estimated binding energy point out that the five stars aregravitationally bound. KU Lib and alpha Lib constitute the widest knownmultiple system at all mass domains, and likely represent the most extremeexample of young wide binaries on the point of being disrupted. Besides, I makea comprehensive compilation of star candidates in Castor, including new ones.

astronomy and astrophysics

Reaching the boundary between stellar kinematic groups and very wide  binaries. II. alpha Lib + KU Lib: a common proper motion system in Castor  separated by 1.0 pc