▁of ▁Jup iter ▁which ▁is ▁located ▁ 5 ▁A U ▁from ▁the ▁Sun . ▁However , ▁due ▁to ▁the ▁short ness ▁of ▁observations , ▁the ▁object ' s ▁orbit ▁was ▁only ▁known ▁with ▁the ▁highest ▁possible ▁uncertainty ▁parameter ▁of ▁ 9 ▁and ▁an ▁orb ital ▁note ▁of ▁E ▁thus ▁the ▁calculated ▁orb ital ▁elements ▁have ▁a ▁large ▁margin ▁of ▁error . ▁ ▁Using ▁the ▁same ▁ 1 4 ▁observations , ▁the ▁ 2 0 1 7 ▁orbit ▁calculations ▁showed ▁ 4 8 1 ▁potential ▁close ▁approaches ▁to ▁Earth ▁between ▁ 2 0 1 7 ▁and ▁ 2 1 1 6 , ▁with ▁a ▁cum ulative ▁rating ▁of ▁− 0 . 7 6 ▁on ▁the ▁Pal ermo ▁Techn ical ▁Imp act ▁Haz ard ▁Sc ale , ▁which ▁was ▁the ▁highest ▁for ▁any ▁object ▁on ▁NASA ' s ▁S entry ▁R isk ▁Table ▁during ▁ 2 0 1 7 ▁and ▁early ▁ 2 0 1 8 . ▁This ▁high ▁rating ▁was ▁a ▁result ▁of ▁the ▁object ' s ▁estimated ▁size ▁and ▁hundreds ▁of ▁potential ▁close ▁approaches ▁to ▁Earth , ▁rather ▁than ▁any ▁confidence ▁in ▁the ▁prediction ▁of ▁any ▁single ▁virtual ▁imp actor . ▁, ▁there ▁are ▁ 1 4 4 ▁Near - E arth ▁objects ▁known ▁to ▁have ▁a ▁diameter ▁of ▁at ▁least ▁ 2   km . ▁ ▁was ▁the ▁largest ▁object ▁listed ▁on ▁the ▁S entry ▁R isk ▁Table . ▁▁ ▁missed ▁ 4 ▁virtual ▁imp actor ▁dates ▁considered ▁in ▁the ▁ 2 0 1 7 ▁orbit ▁calculations : ▁ 2 2 ▁May