1 . 1 2 3 ▁and ▁ 1 . 1 3 , ▁respectively . ▁ ▁Rot ation ▁period ▁▁ ▁In ▁February ▁ 2 0 0 1 , ▁a ▁rot ational ▁light cur ve ▁of ▁ ▁was ▁obtained ▁from ▁phot ometric ▁observations ▁by ▁Pedro ▁Lac er da ▁and ▁Jane ▁Lu u . ▁Light cur ve ▁analysis ▁gave ▁an ▁ambigu ous ▁rotation ▁period ▁of ▁ 8 . 8 4 ▁hours ▁with ▁a ▁bright ness ▁amplitude ▁of ▁ 0 . 1 6 ▁magnitude ▁( ). ▁An ▁alternative ▁period ▁of ▁ 8 . 7 0 ▁hours ▁is ▁also ▁possible . ▁ ▁Diam eter ▁and ▁al bed o ▁▁ ▁According ▁to ▁observations ▁by ▁the ▁space - based ▁H ersch el ▁and ▁Sp itzer ▁teles cop es , ▁ ▁measures ▁between ▁ 3 9 3 ▁and ▁ 4 6 0 ▁kilom eters ▁and ▁its ▁surface ▁has ▁a ▁low ▁al bed o ▁between ▁ 0 . 0 4 3 ▁and ▁ 0 . 0 6 0 . ▁While ▁John ston ' s ▁Archive ▁adopt s ▁a ▁diameter ▁of ▁ 3 9 3 ▁kilom eters , ▁astronom er ▁Michael ▁Brown ▁gives ▁a ▁radi ometric ▁diameter ▁of ▁ 4 7 3 ▁kilom eters ▁and ▁lists ▁this ▁object ▁as ▁a ▁" prob able " ▁d war f ▁planet ▁( 4 0 0 – 5 0 0   km ), ▁which ▁is ▁the ▁category ▁with ▁the ▁second ▁lowest ▁certain ty ▁in ▁his ▁ 5 - class ▁tax onom ic ▁system . ▁The ▁Coll abor ative ▁Ast ero id ▁Light cur ve ▁Link ▁assumes ▁an