▁variation ▁of ▁ 0 . 4 5 ▁in ▁magnitude ▁( ). ▁A ▁second ▁light cur ve ▁from ▁a ▁collaboration ▁of ▁Czech , ▁American ▁and ▁Italian ▁observ ator ies ▁published ▁in ▁November ▁ 2 0 1 3 , ▁gave ▁a ▁period ▁of ▁ ▁hours ▁( ). ▁ ▁Diam eter ▁and ▁al bed o ▁▁ ▁According ▁to ▁the ▁surve ys ▁carried ▁out ▁by ▁the ▁Inf ra red ▁Astronom ical ▁Sat ellite ▁IR AS , ▁the ▁Japanese ▁Ak ari ▁satellite , ▁and ▁NASA ' s ▁W ide - field ▁Inf ra red ▁Survey ▁Explorer ▁with ▁its ▁NE OW I SE ▁mission , ▁the ▁astero id ▁measures ▁between ▁ 2 5 . 6 ▁and ▁ 3 1 . 3 ▁kilom eters ▁in ▁diameter ▁and ▁its ▁surface ▁has ▁an ▁al bed o ▁in ▁the ▁range ▁of ▁ 0 . 0 7 ▁to ▁ 0 . 1 3 . ▁The ▁Coll abor ative ▁Ast ero id ▁Light cur ve ▁Link ▁der ives ▁an ▁al bed o ▁of ▁ 0 . 0 8 ▁and ▁a ▁diameter ▁of ▁ 2 5 . 4 ▁kilometer , ▁slightly ▁below ▁the ▁result ▁obtained ▁by ▁IR AS . ▁ ▁N aming ▁▁ ▁This ▁minor ▁planet ▁was ▁named ▁after ▁American ▁space ▁phys ic ist ▁Geoff rey ▁A . ▁Brig gs , ▁director ▁of ▁the ▁Sol ar ▁System ▁Ex pl oration ▁Division ▁at ▁NASA ▁Head quarters ▁during ▁the ▁ 1 9 8 0 s . ▁He ▁was ▁instrument al ▁for ▁the ▁formation ▁of ▁the ▁U . S . – S ov iet ▁J oint ▁Working ▁Group ▁for