s , ▁a ▁rot ational ▁light cur ve ▁of ▁Por vo o ▁was ▁obtained ▁from ▁phot ometric ▁observations ▁taken ▁by ▁American ▁astronom er ▁Richard ▁P . ▁Bin zel ▁using ▁the ▁ 0 . 9 1 - ▁and ▁ 2 . 1 - m ▁teles cop es ▁at ▁the ▁University ▁of ▁Texas ▁Mc Donald ▁Observ atory . ▁It ▁gave ▁it ▁a ▁well - defined ▁rotation ▁period ▁of ▁ 4 . 8 9 ▁hours ▁with ▁a ▁bright ness ▁variation ▁of ▁ 0 . 3 0 ▁magnitude ▁( ). ▁ ▁Diam eter ▁and ▁al bed o ▁▁ ▁According ▁to ▁the ▁surve ys ▁carried ▁out ▁by ▁NASA ' s ▁W ide - field ▁Inf ra red ▁Survey ▁Explorer ▁with ▁its ▁subsequent ▁NE OW I SE ▁mission , ▁Por vo o ▁measures ▁ 1 0 . 0 3 ▁and ▁ 1 2 . 8 1 ▁kilom eters ▁in ▁diameter , ▁and ▁its ▁surface ▁has ▁an ▁al bed o ▁of ▁ 0 . 0 4 9 ▁and ▁ 0 . 0 7 3 , ▁respectively . ▁ ▁The ▁Coll abor ative ▁Ast ero id ▁Light cur ve ▁Link ▁assumes ▁a ▁standard ▁al bed o ▁for ▁st ony ▁astero ids ▁of ▁ 0 . 2 0 ▁– ▁contrary ▁to ▁the ▁rather ▁carbon ace ous ▁al bed o ▁given ▁by ▁the ▁space - based ▁surve ys ▁– ▁and ▁calcul ates ▁a ▁diameter ▁of ▁ 6 . 3 2 ▁kilom eters ▁with ▁an ▁absolute ▁magnitude ▁of ▁ 1 3 . 3 6 . ▁ ▁N aming ▁▁ ▁This ▁minor ▁planet ▁was ▁named