(367789) 2011 AG5

Near-Earth asteroid in 2040 October 2019 yes (367789) 2011 AG 5 #FFC2E0 2011 AG5 Goldstone radar 2023-02-04 anim.gif Animation of 2011 AG 5 rotating in radar images by the Goldstone Solar System Radar on 4 February 2023 Mount Lemmon Srvy. Mount Lemon Obs. 8 January 2011 (367789) 2011 AG 5 ApolloNEOPHA 2023-Feb-25 (JD 2460000.5) 0 14.2 yr (5,201 days) 3 October 2008 1.978 AU 0.87066 AU 2023-Mar-17 1.424 AU 0.3887 1.7 yr (620.9 days) 348.2° 0.575895 ms / day 3.6946° 135.6° 54.02° 0.00038 AU km LD out 140 m 4 9 kg (assumed) 21.9 (367789) 2011 AG 5 is a sub-kilometer asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. It has a diameter of about 140 m us. It was removed from the Sentry Risk Table on 21 December 2012 and as such it now has a rating of 0 on the Torino Scale. It was recovered in December 2022 extending the observation arc from 4.8 years to 14 years. As of 2023, the distance between the orbits of Earth and 2011 AG 5 is 0.0004 AU km LD on +Earth Approaches on 3 February 2023 and 4 February 2040 Date JPL Horizonsnominal geocentricdistance (AU) uncertaintyregion(3-sigma)2023-Feb-03 08:51 ± 00:01 0.01215 AU e6km unit on ±112 km2040-Feb-04 08:29 ± 00:06 0.00725 AU e6km unit on ±5800 km Description left|thumb|Orbital diagram of 2011 AG 5 (green) passing the Earth-Moon system in February 2040 (orbital solution from 2011) 2011 AG 5 was discovered on 8 January 2011 by the Mount Lemmon Survey at an apparent magnitude of 19.6 using a 1.52 m in on us reflecting telescope. Pan-STARRS precovery images from 8 November 2010 extended the observation arc to 317 days. Observations by the Gemini 8.2 m in on telescope at Mauna Kea recovered the asteroid on 20, 21 and 27 October 2012, and extended the observation arc to 719 days. The October 2012 observations reduced the orbit uncertainties by more than a factor of 60, meaning that the Earth's position in February 2040 no longer falls within the range of possible future paths for the asteroid. On 4 February 2040 the asteroid will pass no closer than 0.007 AU km mi on on (~2.8 LD) from Earth. Until 21 December 2012 it was listed on the Sentry Risk Table with a rating on the Torino Scale of Level 1. A Torino rating of 1 is a routine discovery in which a pass near the Earth is predicted that poses no unusual level of danger. It is estimated that an impact would produce the equivalent of 100 megatons of TNT, roughly twice that of the most powerful nuclear weapon ever detonated (Tsar Bomba). This is powerful enough to damage a region at least a hundred miles wide.August 2025 Older risks Virtual clones of the asteroid that fit the mid-2012 uncertainty region in the known trajectory showed four potential impacts between 2040 and 2047. It had a 1 in 500 chance of impacting the Earth on 5 February 2040. In September 2013, there was an opportunity to make additional observations of 2011 AG 5 when it came within 0.98 AU km mi on off of Earth. The 2013 observations allowed a further refinement to the known trajectory. The asteroid also passed 0.0121 AU km mi on off from the Earth on 3 February 2023. The 2023 gravitational keyhole was 227 miles (365 kilometers) wide. With a Palermo scale rating of –1.00, the odds of impact by 2011 AG 5 were about 10 times less than the background hazard level of Earth impacts which is defined as the average risk posed by objects of the same size or larger over the years until the date of the potential impact. References JPL Small-Body Database Browser: 367789 (2011 AG5) Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=367789&view=OPC https://archive.today/20221024145712/https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html%23/?sstr=367789&view=OPC 2022-10-24 live 1 January 2023 Date/Time Removed NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/removed.html https://web.archive.org/web/20130108122117/http://neo.jpl.nasa.gov/risk/removed.html dead 2013-01-08 2012-12-21 MPEC 2011-A31 : 2011 AG5 IAU Minor Planet Center 2011-01-09 https://www.minorplanetcenter.net/mpec/K11/K11A31.html 2011-10-17 (K11A05G) 367789 (2011 AG5) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=367789 17 January 2018 21 December 2012 "All Clear" Given on Potential 2040 Impact of Asteroid 2011 AG5 NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/news/news176.html https://web.archive.org/web/20121231004831/http://neo.jpl.nasa.gov/news/news176.html dead 31 December 2012 2012-12-21 13 April 2005 The Torino Impact Hazard Scale NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/torino_scale1.html https://web.archive.org/web/20041230031246/http://neo.jpl.nasa.gov/torino_scale1.html dead 30 December 2004 2011-11-05 NEODyS-2 Close Approaches for 2011AG5 Near Earth Objects - Dynamic Site http://newton.spacedys.com/neodys/index.php?pc=1.1.8&n=2011AG5 2013-09-21 Earth Impact Risk Summary: 2011 AG5 Wayback Machine: NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/2011ag5.html 2012-12-12 dead https://web.archive.org/web/20121118232754/http://neo.jpl.nasa.gov/risk/2011ag5.html 2012-11-18 28 February 2012 Asteroid 2011 AG5 - A Reality Check NASA/JPL Near-Earth Object Program Office http://www.jpl.nasa.gov/news/news.cfm?release=2012-051 29 February 2012 16 April 2021 https://web.archive.org/web/20210416083943/https://www.jpl.nasa.gov/news/news.cfm?release=2012-051 dead 15 June 2012 NASA Releases Workshop Data and Findings on Asteroid 2011 AG5 NASA/JPL http://www.nasa.gov/mission_pages/asteroids/news/asteroid20120615.html 2012-06-16 (2012-178) Math: 101.00 = 10 31 August 2005 The Palermo Technical Impact Hazard Scale NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/doc/palermo.html https://web.archive.org/web/20020321092747/http://neo.jpl.nasa.gov/risk/doc/palermo.html dead 21 March 2002 2011-10-14 Horizons Batch for 2023-02-03 Close Approach JPL Horizons https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272011+AG5%27&START_TIME=%272023-02-03%2008:51%27&STOP_TIME=%272023-02-04%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 https://web.archive.org/web/20221024142219/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272011+AG5%27&START_TIME=%272023-02-03%2008:50%27&STOP_TIME=%272023-02-04%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 2022-10-24 live 2023-01-01 RNG_3sigma = uncertainty range in km. (JPL#63/Soln.date: 2021-Jul-11 generates RNG_3sigma = 1518 km) Horizons Batch for 2040-02-04 Close Approach JPL Horizons https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272011+AG5%27&START_TIME=%272040-02-04%2008:29%27&STOP_TIME=%272040-02-05%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 https://web.archive.org/web/20221024141438/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%25272011+AG5%2527&START_TIME=%25272040-02-04%252008:49%2527&STOP_TIME=%25272040-02-05%2527&STEP_SIZE=%25271%2520day%2527&QUANTITIES=%252720,39%252 2022-10-24 live 2023-01-01 RNG_3sigma = uncertainty range in km. (JPL#63/Soln.date: 2021-Jul-11 generates RNG_3sigma = 78079 km) External links UH Observations Result in "All Clear" for Potential Asteroid Impact (Institute for Astronomy at the University of Hawaii 21 December 2012) Phew! One Less Asteroid Impact to Worry About (Phil Plait 22 Dec. 2012) Table of next close approaches (Sormano Astronomical Observatory) MBPL - Minor Body Priority List (Sormano Astronomical Observatory) 367789 367789 2011AG5 367789 (367789) 2011 AG 5 367789 367789 367789 367789 20110108 20230203 20110108