(517103) 2013 EM20

Apollo near-Earth asteroid February 2018 #FFC2E0 (517103) 2013 EM 20 Mt. Lemmon Survey 12 January 2008 (517103) 2013 EM 20 2008 AO 112 NEO Apollo PHA 9 June 2026 (JD 2461200.5) 0 1.8072 AU (Q) 0.93531 AU (q) 1.3713 AU (a) 0.31793 8.3634° 73.879° 165.45° (M) 350.17° 1.6058 yr (586.53 d) 0.04314 AU 4.758 ~310 m us 4.110 kg (assumed) 19.9 (517103) 2013 EM 20 (also designated 2008 AO 112) is an Apollo near-Earth asteroid and potentially hazardous object. It was discovered on 12 January 2008 by the Mount Lemmon Survey at an apparent magnitude of 21 using a 1.5 m in on us reflecting telescope. The asteroid was quickly lost and had an estimated diameter of 310 m us. On 25 June 2009, with an observation arc of only 1 day in January 2008, the asteroid had a 1 in 4 million chance of impacting Earth on that very day. The virtual impactor had not been eliminated from the Sentry Risk Table by the day of the potential impact. The asteroid was recovered on 5 March 2013 as 2013 EM 20. Precovery images from 7 April 1997 at Kitt Peak National Observatory were located. It was removed from the Sentry Risk Table on 30 March 2013. It is now known that on 25 June 2009 the asteroid was 1.45 AU from Earth. References last observation: 2026-05-08; arc: 29.08 years JPL Small-Body Database Browser: (2013 EM20 = 2008 AO112) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2008AO112 Jet Propulsion Laboratory 2026-07-07 MPEC 2008-D33 IAU Minor Planet Center 2008-02-25 http://www.minorplanetcenter.net/mpec/K08/K08D33.html 2013-08-28 (K08AB2O) MPEC 2013-E32 : 2013 EM20 IAU Minor Planet Center 2013-03-08 http://www.minorplanetcenter.net/mpec/K13/K13E32.html 2013-08-28 (K13E20M) 2009-06-25 Earth Impact Risk Summary: 2008 AO112 Wayback Machine: NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/2008ao112.html 2013-08-28 dead https://web.archive.org/web/20090625081507/http://neo.jpl.nasa.gov/risk/2008ao112.html June 25, 2009 (2.5e-07 = 1 in 4,000,000 chance) Horizons output http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2008AO112 Horizon Online Ephemeris System 2013-08-28 (Geocentric Solution) Date/Time Removed NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/removed.html https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html dead 2002-06-02 2013-08-28 External links 2008+AO112 2008AO112 2517103 517103 (517103) 2013 EM 20 Category:Apollo asteroids Category:Potentially hazardous asteroids Category:Discoveries by MLS Category:Near-Earth objects removed from the Sentry Risk Table 20080112