2 9 0 ▁days ). ▁Its ▁orbit ▁has ▁an ▁ecc ent ric ity ▁of ▁ 0 . 3 0 ▁and ▁an ▁incl ination ▁of ▁ 2 2 ° ▁with ▁respect ▁to ▁the ▁e cli ptic . ▁ ▁The ▁astero id ' s ▁observation ▁arc ▁begins ▁with ▁its ▁official ▁discovery ▁observation ▁at ▁Anderson ▁M esa . ▁No ▁prior ▁ident ifications ▁were ▁made ▁and ▁no ▁prec over ies ▁taken . ▁ ▁Phys ical ▁characteristics ▁▁ ▁Gib bs ▁is ▁an ▁assumed ▁st ony ▁S - type ▁astero id , ▁which ▁agre es ▁with ▁the ▁overall ▁spectral ▁type ▁of ▁the ▁Ph oc ae a ▁family . ▁ ▁Rot ation ▁period ▁▁ ▁In ▁ 2 0 0 5 , ▁two ▁rot ational ▁light cur ves ▁of ▁Gib bs ▁were ▁obtained ▁from ▁phot ometric ▁observations ▁by ▁Italian ▁amateur ▁astronom ers ▁Feder ico ▁Man z ini ▁and ▁Roberto ▁C ri ppa . ▁Light cur ve ▁analysis ▁gave ▁a ▁rotation ▁period ▁of ▁ 3 . 0 6 ▁and ▁ 3 . 0 6 1 5 3 ▁hours ▁with ▁a ▁bright ness ▁variation ▁of ▁ 0 . 3 1 ▁and ▁ 0 . 3 9 ▁magnitude , ▁respectively ▁( ). ▁In ▁December ▁ 2 0 1 6 , ▁Robert ▁Steph ens ▁obtained ▁a ▁well - defined ▁light cur ve ▁at ▁his ▁Tro jan ▁Station ▁() ▁that ▁gave ▁a ▁period ▁of ▁ 3 . 1 8 9 ▁hours ▁and ▁an ▁amplitude ▁of ▁ 0 . 2 6 ▁magnitude ▁( ). ▁ ▁Diam eter ▁and ▁al bed o ▁▁ ▁According ▁to ▁the ▁survey ▁carried