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(152680) 1998 KJ9

::concepts

Title::jpldata    Earth::years    Object::asteroid    Close::december    Orbit::neodys    Planet::minor

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(152680) 1998 KJ9 is a near-Earth asteroid and potentially hazardous object.<ref name=jpldata/> It has a well determined orbit with an excellent observation arc of 21 years and an Uncertainty Parameter of 0.<ref name=jpldata/>

It was discovered on 27 May 1998 by the Lincoln Near-Earth Asteroid Research (LINEAR) at an apparent magnitude of 17.6 using a {{safesubst:#invoke:convert|convert}} reflector.<ref name="MPEC1998-K31"/> It was tracked through 9 June 1998.<ref name="mpc"/> It was recovered on 28 December 2003 which extended the observation arc by 5 years.<ref name="MPEC2003-Y87"/> Two precovery images from January 1990 extended the observation arc by 8 years.<ref name="mpc"/>

Based on an absolute magnitude of 19.4,<ref name="jpldata"/> the asteroid has an estimated diameter of about {{safesubst:#invoke:convert|convert}}.<ref name="Chronology"/> (152680) 1998 KJ9 is noted for a close approach to the Earth on 31 December 1914 at a distance of {{safesubst:#invoke:convert|convert}}.<ref name=jpl-close/> 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.<ref name="NEODyS1914"/>


(152680) 1998 KJ9 sections
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