▁ 2 0 1 1 ▁by ▁the ▁Mount ▁Lem mon ▁Survey ▁at ▁an ▁apparent ▁magnitude ▁of ▁ 1 9 . 6 ▁using ▁a ▁ ▁reflect ing ▁teles cope . ▁Pan - ST AR RS ▁prec overy ▁images ▁from ▁ 8 ▁November ▁ 2 0 1 0 ▁extended ▁the ▁observation ▁arc ▁to ▁ 3 1 7 ▁days . ▁Observ ations ▁by ▁the ▁Gem ini ▁ ▁teles cope ▁at ▁Ma una ▁Ke a ▁recovered ▁the ▁astero id ▁on ▁October ▁ 2 0 , ▁ 2 1 ▁and ▁ 2 7 , ▁ 2 0 1 2 , ▁and ▁extended ▁the ▁observation ▁arc ▁to ▁ 7 1 9 ▁days . ▁ ▁The ▁October ▁ 2 0 1 2 ▁observations ▁have ▁reduced ▁the ▁orbit ▁un cert aint ies ▁by ▁more ▁than ▁a ▁factor ▁of ▁ 6 0 , ▁meaning ▁that ▁the ▁Earth ' s ▁position ▁in ▁February ▁ 2 0 4 0 ▁no ▁longer ▁falls ▁within ▁the ▁range ▁of ▁possible ▁future ▁paths ▁for ▁the ▁astero id . ▁On ▁ 4 ▁February ▁ 2 0 4 0 ▁the ▁astero id ▁will ▁pass ▁no ▁closer ▁than ▁ ▁( ~ 2 . 3 ▁L D ) ▁from ▁Earth . ▁Until ▁ 2 1 ▁December ▁ 2 0 1 2 ▁it ▁was ▁listed ▁on ▁the ▁S entry ▁R isk ▁Table ▁with ▁a ▁rating ▁on ▁the ▁Tor ino ▁Sc ale ▁of ▁Level ▁ 1 . ▁A ▁Tor ino ▁rating ▁of ▁ 1 ▁is ▁a ▁routine ▁discovery ▁in ▁which ▁a ▁pass ▁near ▁the ▁Earth ▁is ▁predicted ▁that ▁pos es ▁no ▁unusual ▁level ▁of