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We present photometric, astrometric, and spectroscopic observations ofUSco160611.9-193532 AB, a candidate ultrawide (~1600 AU), low-mass (M_tot~0.4M_sun) multiple system in the nearby OB association Upper Scorpius. We concludethat both components are young, comoving members of the association; we alsopresent high-resolution observations which show that the primary is itself aclose binary system. If the Aab and B components are gravitationally bound, thesystem would fall into the small class of young multiple systems which haveunusually wide separations as compared to field systems of similar mass.However, we demonstrate that physical association can not be assumed purely onprobabilistic grounds for any individual candidate system in this separationrange. Analysis of the association's two-point correlation function shows thatthere is a significant probability (25%) that at least one pair of low-massassociation members will be separated in projection by <15", so analysis of thewide binary population in Upper Sco will require a systematic search for allwide systems; the detection of another such pair would represent an excess atthe 98% confidence level.

USco1606-1935: An Unusually Wide Low-Mass Triple System?