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(152680) 1998 KJ9

Small near-Earth asteroid

Field	Value
minorplanet	yes
background	#FFC2E0
name
discovery_ref
discoverer	LINEAR (704)
1.0-m Reflector
discovery_site	Lincoln Lab's ETS
discovered	27 May 1998
mpc_name
mp_category	NEOPHAApollo
orbit_ref
epoch	13 January 2016 (JD 2457400.5)
aphelion	2.3742 AU (Q)
perihelion	0.52125 AU (q)
semimajor	1.4477 AU (a)
eccentricity	0.63995 (e)
period	1.74 yr (636.25 d)
inclination	10.932° (i)
asc_node	98.675° (Ω)
mean_anomaly	6.2670° (M)
arg_peri	259.95° (ω)
dimensions	~500 meters
mass	7.87 kg
abs_magnitude	19.4
mean_motion	/ day (n)
observation_arc	7706 days (21.10 yr)
uncertainty	0
moid	0.00552 AU

1.0-m Reflector

**** is a sub-kilometer asteroid, classified as 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 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. is noted for a close approach to the Earth on 31 December 1914 at a distance of 0.00155 AU. 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

|archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304053700/http://www.minorplanetcenter.net/iau/mpec/J98/J98K31.html |url-status=live

|archive-date=21 January 2021 |archive-url=https://web.archive.org/web/20210121123359/http://neo.ssa.esa.int/web/guest/neo-chronology |url-status=live

|archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304061057/http://www.minorplanetcenter.net/db_search/show_object?object_id=152680 |url-status=live

|archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304053700/http://www.minorplanetcenter.net/iau/mpec/J98/J98K31.html |url-status=live

|archive-date=4 November 2020 |archive-url=https://web.archive.org/web/20201104034432/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998KJ9;cad=1#cad |url-status=live

|archive-date=16 December 2024 |archive-url=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 |url-status=live

References

[https://cneos.jpl.nasa.gov/ca/ NEO Earth Close Approaches] {{Webarchive. link. (19 October 2017 @ JPL CNEOS
Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)")

Info: Wikipedia Source

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apollo-asteroids discoveries-by-linear potentially-hazardous-asteroids astronomical-objects-discovered-in-1998

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