With an observation arc of 60 days, it had about a 1 in 1800 chance of impacting Earth on 3 June 2048; the probability went to effectively zero when the 2014 recovery observations were taken into account.
The impacts which created the Barringer Crater and the 1908 Tunguska event are both estimated to be in the 3–10 megaton range, corresponding to Torino Scale 8.
The first version, called "A Near-Earth Object Hazard Index", was presented at a United Nations conference in 1995 and was published by Binzel in the subsequent conference proceedings (Annals of the New York Academy of Sciences, volume 822, 1997.) A revised version of the "Hazard Index" was presented at a June 1999 international conference on NEOs held in Torino (Turin), Italy.
The first version, called "A Near-Earth Object Hazard Index", was presented at a United Nations conference in 1995 and was published by Binzel in the subsequent conference proceedings (Annals of the New York Academy of Sciences, volume 822, 1997.) A revised version of the "Hazard Index" was presented at a June 1999 international conference on NEOs held in Torino (Turin), Italy.
It was removed from the Sentry Risk Table on 14 February 2008. * was a lost asteroid from December 1997 that had an observation arc of 27 days.
The first version, called "A Near-Earth Object Hazard Index", was presented at a United Nations conference in 1995 and was published by Binzel in the subsequent conference proceedings (Annals of the New York Academy of Sciences, volume 822, 1997.) A revised version of the "Hazard Index" was presented at a June 1999 international conference on NEOs held in Torino (Turin), Italy.
From early 2002 until 24 February 2006 it was estimated to have a 1 in 10,000 chance of impacting Earth on June 1, 2101.
It was removed from the risk table on 29 July 2003. * was rated level 1 on 30 August 2003 and removed from the Sentry Risk Table on 14 September 2003. * was rated level 1 in early October 2003, and removed on 13 October 2003. * was rated level 1 on 27 December 2003 with an observation arc of 8.7 days.
It was removed from the risk table on 29 December 2003. 2004 * was rated level 1 on 1 March 2004 with an observation arc of 7.8 days.
It was removed from the Sentry Risk Table on 2 December 2016, when prediscovery images by Pan-STARRS from October 2016 and precovery images taken from Mauna Kea in July 2003 where located and included in the impact calculations. * was listed on the JPL Near Earth Object Risk List with a Torino Scale of Level 1 on 25 December 2016, while the NEODyS Risk List has it at a lower impact probability, sufficient to classify it as Torino Scale Level 0.
It was removed from the risk table on 29 December 2003. 2004 * was rated level 1 on 1 March 2004 with an observation arc of 7.8 days.
It was removed on 5 March 2004. * was rated level 1 on 27 March 2004 with an observation arc of 6.9 days.
It was lowered to 0 on 2 April 2004.
It was removed on 13 April 2004. * (a near-Earth asteroid 370 meters in diameter) became the first object rated level 2 on 23 December 2004, and was subsequently upgraded to level 4 — the current record for highest Torino rating.
The chance of an actual collision with an asteroid like 2005 YU55 (~400 meters in diameter) is about 1 percent in the next thousand years. * was rated level 1 on 18 May 2010 with an observation arc of 7 days.
It retained a rating of level 1 for a 2036 encounter due to the orbital uncertainties introduced by the gravitational deflection until August 2006, when Apophis was downgraded to 0. 2006 * (using an observation arc of 475 days) was upgraded to level 2 in February 2006 for a possible 2102 encounter, making it the second asteroid rated above level 1.
From early 2002 until 24 February 2006 it was estimated to have a 1 in 10,000 chance of impacting Earth on June 1, 2101.
It was removed from the risk table on 24 February 2006 when it was serendipitously rediscovered. * (with an observation arc of 7 days) showed a 1 in 42000 chance of impacting Earth on 22 January 2029.
It was removed from the Sentry Risk Table on 23 November 2006. * was rated level 1 on December 22, 2006, when it had an observation arc of 25 days, but was removed from the Sentry Risk Table on February 7, 2007. 2007 * was rated level 1 for one week ending 19 February 2007.
It was removed from the Sentry Risk Table on 23 November 2006. * was rated level 1 on December 22, 2006, when it had an observation arc of 25 days, but was removed from the Sentry Risk Table on February 7, 2007. 2007 * was rated level 1 for one week ending 19 February 2007.
It was removed from the risk table on February 22. * was rated level 1 on 3 July 2007 with an observation arc of 19 days.
It was removed from the risk table on 15 July 2007. 2008 * was rated level 1 until 14 February 2008.
It was lowered to Torino Scale 0 on the next day (24 February 2014). * was listed on the Near Earth Object Risk List with a Torino Scale of Level 1 from after its discovery in November 2007 until recovered in March 2014.
It was removed from the Sentry Risk Table on 14 February 2008. * was a lost asteroid from December 1997 that had an observation arc of 27 days.
It was removed from the risk table on 15 July 2007. 2008 * was rated level 1 until 14 February 2008.
It was removed from the risk table on 19 December 2009. 2009 * was rated level 1 after its discovery in May 2009 (with a 15-day observation arc), and downgraded to 0 by 11 June 2009.
It was removed 17 June 2009. * was rated level 1 after its discovery on 17 November 2009, and downgraded by the end of November.
It was not removed from the risk table until 26 June 2013. * was rated level 1 on 28 December 2009 (with an observation arc of 10 days).
It was downgraded to 0 by the end of December. 2010 * was rated level 1 in February 2010, and downgraded to 0 on 9 April 2010.
The chance of an actual collision with an asteroid like 2005 YU55 (~400 meters in diameter) is about 1 percent in the next thousand years. * was rated level 1 on 18 May 2010 with an observation arc of 7 days.
It was removed on 23 May 2010. * was rated level 1 in December 2010, and downgraded to 0 on 2 January 2011. 2011 * was rated level 1 on 13 February 2011 with an observation arc of 13.8 days.
It was removed on 23 May 2010. * was rated level 1 in December 2010, and downgraded to 0 on 2 January 2011. 2011 * was rated level 1 on 13 February 2011 with an observation arc of 13.8 days.
It was removed from the risk table on 10 March 2011. * was rated level 1 on 28 September 2011 with an observation arc of 2.6 days and listed virtual impactors in 2016 and 2019.
But it was quickly downgraded to 0 a few days later and was removed from the risk table on 7 October 2011. * is an asteroid with a diameter of 2.6 km, which was rated level 1 on October 27, 2011 (with an observation arc of 9.6 days.) It was downgraded to 0 a few days later. * was rated level 1 on 4 November 2011 with an observation arc of 9 days.
It was removed 17 November 2011. 2012 * was rated level 1 on 21 February 2012 (with an observation arc of 8.9 days).
It was removed from the Sentry Risk Table on June 25. * was rated at Torino scale 1 from February 2011 to December 2012, for an impact on 5 February 2040.
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.
The asteroid was estimated to be roughly in diameter and had a virtual impactor listing a 1 in 625,000 chance of impact on 14 March 2012.
It was removed 17 November 2011. 2012 * was rated level 1 on 21 February 2012 (with an observation arc of 8.9 days).
It was removed from the risk table on 3 March 2012. * was rated at Torino scale 1 on 23 June 2012 with an observation arc of 4 days.
It was removed from the Sentry Risk Table on June 25. * was rated at Torino scale 1 from February 2011 to December 2012, for an impact on 5 February 2040.
It was downgraded thanks to observations collected in October 2012 with telescopes on Mauna Kea, Hawaii. 2013 * (a near-Earth asteroid with a 450 m diameter) was rated level 1 on 16 October 2013 (with an observation arc of 7.3 days).
The 2013 Chelyabinsk meteor had a total kinetic energy prior to impact of about 0.5 megatons, corresponding to Torino Scale 0.
The impact probability was reduced to ~1:120000 in April 2013, corresponding to Torino Scale 1 or 2. ==Objects with non-zero Torino ratings== ===Currently non-zero=== none ===Downgraded to zero=== This is a partial list of near-Earth asteroids that have been listed with a Torino Scale rating of 1+ and been lowered to 0 or been removed from the Sentry Risk Table altogether.
It was not removed from the risk table until 26 June 2013. * was rated level 1 on 28 December 2009 (with an observation arc of 10 days).
It was downgraded thanks to observations collected in October 2012 with telescopes on Mauna Kea, Hawaii. 2013 * (a near-Earth asteroid with a 450 m diameter) was rated level 1 on 16 October 2013 (with an observation arc of 7.3 days).
It was downgraded to 0 on 3 November 2013.
It was completely removed from the Sentry Risk Table on 8 November 2013 using JPL solution 32 with an observation arc of 27 days. 2014 * with an estimated diameter of 100 meters was rated level 1 on 23 February 2014 with an observation arc of 5 days.
It was completely removed from the Sentry Risk Table on 8 November 2013 using JPL solution 32 with an observation arc of 27 days. 2014 * with an estimated diameter of 100 meters was rated level 1 on 23 February 2014 with an observation arc of 5 days.
It was lowered to Torino Scale 0 on the next day (24 February 2014). * was listed on the Near Earth Object Risk List with a Torino Scale of Level 1 from after its discovery in November 2007 until recovered in March 2014.
With an observation arc of 60 days, it had about a 1 in 1800 chance of impacting Earth on 3 June 2048; the probability went to effectively zero when the 2014 recovery observations were taken into account.
With an observation arc of only 6 days it showed a 1 in 7140 chance of impact on 1 June 2015.
The asteroid is estimated to have a diameter of , and travels through space with a speed of 15.6 km/s relative to Earth. 2015 * was listed on the JPL Near Earth Object Risk List with a Torino Scale of Level 1 on 22 July 2015 and again on 11 August 2015, while the NEODyS Risk List had it at a slightly lower impact probability, sufficient to classify it as Torino Scale Level 0.
It was discovered on 12 July 2015 by Pan-STARRS.
The asteroid is estimated to have a diameter of , and would impact Earth at a relative speed of . * was listed on NEODyS with a Torino Scale of Level 1 on 23 August 2015.
Sentry also listed it with a Torino Scale of Level 1 on 24 August 2015.
It was downgraded to level 0 on 8 September 2015.
It was discovered on 13 August 2015 by the Space Surveillance Telescope.
It was removed from the risk table on 10 March 2011. * was rated level 1 on 28 September 2011 with an observation arc of 2.6 days and listed virtual impactors in 2016 and 2019.
The asteroid is estimated to have a diameter of . 2016 * was rated at level 1 for a day on 25 January 2016 by the NEODyS system, and downgraded to level 0 the following day.
On the Sentry system it never crossed the threshold between the two levels, due to a lower computed impact probability. * was rated at level 1 by NEODyS on 25 March 2016, but subsequently lowered to zero thanks to prediscovery observations by the Pan-STARRS survey.
The asteroid is estimated to have a diameter of about . * was listed on the JPL Near Earth Object Risk List with a Torino Scale of Level 1 on 25 November 2016, while the NEODyS Risk List has it at a lower impact probability, sufficient to classify it as Torino Scale Level 0.
It was discovered on 19 November 2016 by Mt.
It was removed from the Sentry Risk Table on 2 December 2016, when prediscovery images by Pan-STARRS from October 2016 and precovery images taken from Mauna Kea in July 2003 where located and included in the impact calculations. * was listed on the JPL Near Earth Object Risk List with a Torino Scale of Level 1 on 25 December 2016, while the NEODyS Risk List has it at a lower impact probability, sufficient to classify it as Torino Scale Level 0.
It was removed from the Sentry monitoring list on 10 February 2020 with 19 precovery images from January to April 2016. * (diameter ~590 meters) with a 15-day observation showed a 1 in 290,000 chance of impact on 10 September 2074 and showed a 1 in 77,000 chance of impact on 9 September 2081.
It was removed from the Sentry Risk Table on 7 January 2017 with a 29-day observation arc. 2017 * was listed on the JPL Near Earth Object Risk List and NEODyS Risk List with a Torino Scale of Level 1 on 19 January 2017.
It was removed from the Sentry Risk Table on 23 January 2017 with a 19-day observation arc. * was listed on the JPL Near Earth Object Risk List and NEODyS Risk List with a Torino Scale of Level 1 on 3 February 2017.
The value decreased to 0 with further observations on February 11, with a cumulative impact chance of 1 in 4258. * was listed on the NEODyS Risk List with a Torino Scale of Level 1 on 8 February 2017.
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.
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. 2020 * (diameter ~700 meters) with a 13-day observation arc showed a 1 in 180,000 chance of impact on 14 October 2046.
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.
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.
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. 2020 * (diameter ~700 meters) with a 13-day observation arc showed a 1 in 180,000 chance of impact on 14 October 2046.
It was removed from the risk table on 10 March 2011. * was rated level 1 on 28 September 2011 with an observation arc of 2.6 days and listed virtual impactors in 2016 and 2019.
It was removed from the Sentry monitoring list on 10 February 2020 with 19 precovery images from January to April 2016. * (diameter ~590 meters) with a 15-day observation showed a 1 in 290,000 chance of impact on 10 September 2074 and showed a 1 in 77,000 chance of impact on 9 September 2081.
It was removed from the sentry risk table entirely on 11 March 2020. * (diameter ~600 meters) initially showed, with a 7.6 day observation arc, a 1 in 83,000 chance of impact on 3 August 2093.
It was removed from the sentry risk table entirely on July 31 with a 15.6 day observation arc. * 2020 XR (diameter ~390 meters) with a 5 day observation arc showed a 1 in 11,000 chance of impact on 1 December 2028 and a nominal distance from Earth on 1 December 2028 of with an uncertainty region of ±304 million km.
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