▁six ▁years , ▁long ▁enough ▁for ▁astronom ers ▁to ▁ref ine ▁and ▁calculate ▁' s ▁orbit ▁with ▁accuracy . ▁This ▁greatly ▁reduced ▁un cert aint ies ▁in ▁the ▁astero id ' s ▁orbit , ▁reducing ▁its ▁uncertainty ▁parameter ▁from ▁ 8 ▁to ▁ 1 . ▁ ▁the ▁observation ▁arc ▁of ▁ ▁sp ans ▁ 6 . 0 9 ▁years ▁or ▁ 2 , 2 2 4 ▁days , ▁and ▁its ▁orbit ▁has ▁an ▁uncertainty ▁parameter ▁of ▁ 0 ▁according ▁to ▁the ▁J PL ▁Small - Body ▁Database . ▁▁ 2 0 2 0 ▁Earth ▁approach ▁ ▁On ▁ 3 ▁February ▁ 2 0 2 0 ▁at ▁ 1 8 : 5 6   UTC , ▁ ▁passed ▁, ▁or ▁ 1 1 . 3 5 ▁lun ar ▁distances , ▁from ▁Earth . ▁During ▁its ▁close ▁approach ▁to ▁Earth , ▁the ▁astero id ▁approached ▁Earth ▁at ▁a ▁rate ▁of ▁ ▁and ▁its ▁apparent ▁visual ▁bright ness ▁pe aked ▁around ▁magnitude ▁ 1 5 . 7 , ▁which ▁is ▁too ▁faint ▁to ▁be ▁seen ▁with ▁the ▁n aked ▁eye . ▁At ▁closest ▁approach ▁the ▁astero id ' s ▁apparent ▁motion ▁in ▁the ▁sky ▁was ▁ 1 . 2 ▁degrees ▁per ▁hour ▁and ▁was ▁in ▁the ▁const ell ation ▁of ▁Cet us , ▁at ▁an ▁apparent ▁magnitude ▁of ▁ 1 6 ▁and ▁an ▁angular ▁separation ▁of ▁ 2 0 ▁degrees ▁from ▁the ▁Moon . ▁ ▁The ▁February ▁ 2 0 2 0 ▁encounter ▁by ▁ ▁provided ▁an ▁opportunity ▁for ▁rad ar ▁observ ator ies ▁to ▁study