▁ 2 0 1 7 , ▁ 1 ▁December ▁ 2 0 1 7 , ▁ 2 0 ▁December ▁ 2 0 1 7 , ▁and ▁ 8 ▁January ▁ 2 0 1 8 . ▁The ▁next ▁potential ▁close ▁approach ▁by ▁ ▁was ▁to ▁be ▁on ▁ 1 7 ▁December ▁ 2 0 1 8 ▁with ▁the ▁odd s ▁of ▁an ▁Earth ▁impact ▁being ▁ 1 ▁in ▁ 9 1 ▁million . ▁J PL ▁Hor iz ons ▁nom inal ▁solution ▁estimated ▁that ▁on ▁ 1 7 ▁December ▁ 2 0 1 8 ▁the ▁astero id ▁would ▁be ▁ ▁from ▁Earth ▁with ▁a ▁ 3 - sigma ▁uncertainty ▁of ▁ ± 1 0 ▁billion ▁km . ▁ ▁Among ▁the ▁potential ▁close ▁approaches , ▁the ▁one ▁on ▁ 1 0 ▁February ▁ 2 0 2 7 ▁had ▁the ▁highest ▁impact ▁risk ▁with ▁a ▁Pal ermo ▁Sc ale ▁rating ▁of ▁− 1 . 9 8 , ▁which ▁was ▁the ▁third - high est ▁for ▁any ▁object ▁on ▁the ▁S entry ▁R isk ▁Table ▁in ▁early ▁ 2 0 1 8 . ▁But ▁the ▁uncertainty ▁in ▁the ▁ge oc ent ric ▁distance ▁on ▁ 1 0 ▁February ▁ 2 0 2 7 ▁was ▁ ± 1 7 ▁billion ▁km . ▁The ▁odd s ▁of ▁this ▁astero id ▁impact ing ▁Earth ▁on ▁ 1 0 ▁February ▁ 2 0 2 7 ▁were ▁ 1 ▁in ▁ 4 . 8 ▁million . ▁ ▁In ▁ 2 0 1 7 ▁the ▁Minor ▁Planet ▁Center ▁( MP C ) ▁used ▁