(152680) 1998 KJ9

Small near-Earth asteroid October 2019 yes #FFC2E0 (152680) 1998 KJ 9 LINEAR (704)1.0-m Reflector Lincoln Lab's ETS 27 May 1998 (152680) 1998 KJ 9 NEOPHAApollo 13 January 2016 (JD 2457400.5) 2.3742 AU Gm on on (Q) 0.52125 AU Gm on (q) 1.4477 AU Gm on (a) 0.63995 (e) 1.74 yr (636.25 d) 10.932° (i) 98.675° (Ω) 6.2670° (M) 259.95° (ω) ~500 meters 7.8710 kg 19.4 0.56582 ms / day (n) 7706 days (21.10 yr) 0 0.00552 AU km on (152680) 1998 KJ 9 is a sub-kilometer asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. Based on absolute magnitude, it is the third largest asteroid known to have passed closer than the Moon. Description It was discovered on 27 May 1998, by astronomers of the Lincoln Near-Earth Asteroid Research (LINEAR) at Lincoln Laboratory's ETS near Socorro, New Mexico, at an apparent magnitude of 17.6 using a 1.0 m in on us reflector. It was tracked through 9 June 1998. It was recovered on 28 December 2003 which extended the observation arc by 5 years. Two precovery images from January 1990 extended the observation arc by 8 years. Based on an absolute magnitude of 19.4, the asteroid has an estimated diameter of about 500 m. (152680) 1998 KJ 9 is noted for a close approach to the Earth on 31 December 1914 at a distance of 0.00155 AU km mi on on. It is one of the largest objects known to have come inside the orbit of the moon. During the 1914 close approach the asteroid reached about apparent magnitude 7.7. References last observation: 2011-02-06; arc: 21.1 years JPL Small-Body Database Browser: 152680 (1998 KJ9) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998KJ9 Jet Propulsion Laboratory 7 April 2016 MPEC 1998-K31 : 1998 KJ9 IAU Minor Planet Center 1998-05-29 https://www.minorplanetcenter.net/iau/mpec/J98/J98K31.html 2011-11-15 4 March 2016 https://web.archive.org/web/20160304053700/http://www.minorplanetcenter.net/iau/mpec/J98/J98K31.html live (J98K09J) 13 October 2011 Version 20.1 Near Earth Asteroids (NEAs) International Astronomical Union http://neo.ssa.esa.int/web/guest/neo-chronology 2011-10-30 21 January 2021 https://web.archive.org/web/20210121123359/http://neo.ssa.esa.int/web/guest/neo-chronology live 2011-02-06; arc=7706 days (152680) = 1998 KJ9 Orbit Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=152680 2013-09-24 4 March 2016 https://web.archive.org/web/20160304061057/http://www.minorplanetcenter.net/db_search/show_object?object_id=152680 live MPEC 2003-Y87 : 1998 KJ9 IAU Minor Planet Center 2003-12-29 https://www.minorplanetcenter.net/iau/mpec/J98/J98K31.html 2013-09-24 4 March 2016 https://web.archive.org/web/20160304053700/http://www.minorplanetcenter.net/iau/mpec/J98/J98K31.html live last observation: 2011-02-06; arc: 21.1 years JPL Close-Approach Data: 152680 (1998 KJ9) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998KJ9;cad=1#cad 2011-11-15 4 November 2020 https://web.archive.org/web/20201104034432/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998KJ9;cad=1#cad live 1998KJ9 Ephemerides for 31 December 1914 NEODyS (Near Earth Objects - Dynamic Site) http://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=152680&oc=500&y0=1914&m0=12&d0=31&h0=0&mi0=0&y1=1915&m1=1&d1=2&h1=0&mi1=0&ti=1&tiu=hours 2011-11-15 16 December 2024 https://web.archive.org/web/20241216134958/https://newton.spacedys.com//neodys/index.php?pc=1.1.3.1&n=152680&oc=500&y0=1914&m0=12&d0=31&h0=0&mi0=0&y1=1915&m1=1&d1=2&h1=0&mi1=0&ti=1&tiu=hours live Asteroid General Data - 1998 KJ9 (152680) http://smallbodies.ru/en/asteroids/info/general/1998_KJ9/ Catalogue of the Solar System Small Bodies Orbital Evolution 2011-11-15 NEO Earth Close Approaches https://web.archive.org/web/20171019211133/https://cneos.jpl.nasa.gov/ca/ 19 October 2017 @ JPL CNEOSSelect "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)" External links 152680 152680 1998KJ9 Large NEO Earth close approach(inside the orbit of the Moon) 31 December 1914 (163132) 2002 CU 11 152680 (152680) 1998 KJ 9 152680 152680 152680 19980527