a crater 10 km in diameter. Follow-up observations on February 10 eliminated the chances of impact on every date except for 4 June 2044, with a 4.59E-10 chance of impact on that date, or less than a 1 in 2 billion chance of impact. It was removed from the Sentry Risk Table on 15 February 2017. 2018 was listed on the JPL Near Earth Object Risk List and NEODyS Risk List with a Torino Scale of Level 1 on 5 January 2018. With a 15-day observation arc, it had an estimated 1 in 21000 chance of impacting Earth on 30 June 2047. The asteroid is estimated to have a diameter of , and would impact Earth at a relative speed of . By 9 January 2018 the geocentric 30 June 2047 uncertainty region had shrunk to ±50 million km. After calculations based on a 20-day observation arc were made, chances of impact on 30 June 2047 dropped to 1 in 670000, and was downgraded to Level 0. was listed on the JPL Near Earth Object Risk List with a Torino Scale of Level 1 as of 20 January 2018. With a 40-day observation arc, it had an estimated 1 in 3000 chance of impacting Earth on 28 April 2057. The asteroid is estimated to have a diameter of about . The nominal 2057 Earth approach distance was estimated at with a 3-sigma uncertainty of ±52 million km. On 27 January 2018 Pan-STARRS precovery images from November and December 2011 were announced, and was removed from the Sentry Risk Table. (diameter ~480 meters) with a 7-day observation arc showed a 1 in 270,000 chance of impact on 5 April 2111 using the 17 April 2018 orbit solution. Later on the same day it was removed from the Sentry Risk Table as a result of precovery images dating back to 24 September 2017 extending the observation arc to 205 days. was removed from the Sentry monitoring list on 14 June 2018 after having been on the Risk List with a Torino Scale of Level 1. 2019 No asteroids reached Torino scale 1 in 2019. 2020 (diameter ~700 meters) with a 13-day observation arc showed a 1 in 180,000 chance of impact on 14 October 2046. But the nominal solution had the asteroid from Earth on 14 October 2046. It was removed from the Sentry monitoring list on 10 February 2020 with 19