(152680)_1998_KJ9

<span class="nowrap">(152680) 1998 KJ<sub>9</sub></span>

(152680) 1998 KJ9

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(152680) 1998 KJ9 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.[2] Based on absolute magnitude, it is the third largest asteroid known to have passed closer than the Moon.[5]

Quick Facts Discovery, Discovered by ...

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-meter (39 in) reflector.[1] It was tracked through 9 June 1998.[6] It was recovered on 28 December 2003 which extended the observation arc by 5 years.[7] Two precovery images from January 1990 extended the observation arc by 8 years.[6]

Based on an absolute magnitude of 19.4,[2] the asteroid has an estimated diameter of about 500 metres (1,600 ft).[3] (152680) 1998 KJ9 is noted for a close approach to the Earth on 31 December 1914 at a distance of 0.00155 AU (232,000 km; 144,000 mi).[8] 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.[9]

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History of close approaches of large near-Earth objects since 1908 (A)

References

  1. [1]
    "MPEC 1998-K31 : 1998 KJ9". IAU Minor Planet Center. 29 May 1998. Retrieved 15 November 2011. (J98K09J)
  2. [2]
    "JPL Small-Body Database Browser: 152680 (1998 KJ9)" (last observation: 2011-02-06; arc: 21.1 years). Jet Propulsion Laboratory. Retrieved 7 April 2016.
  3. [3]
    "Near Earth Asteroids (NEAs)" (Version 20.1). International Astronomical Union. 13 October 2011. Retrieved 30 October 2011.
  4. [4]
    "Asteroid General Data - 1998 KJ9 (152680)". Catalogue of the Solar System Small Bodies Orbital Evolution. Retrieved 15 November 2011.
  5. [5]
    NEO Earth Close Approaches @ JPL CNEOS
    Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"
  6. [6]
    "(152680) = 1998 KJ9 Orbit" (2011-02-06; arc=7706 days). Minor Planet Center. Retrieved 24 September 2013.
  7. [7]
    "MPEC 2003-Y87 : 1998 KJ9". IAU Minor Planet Center. 29 December 2003. Retrieved 24 September 2013.
  8. [8]
    "JPL Close-Approach Data: 152680 (1998 KJ9)" (last observation: 2011-02-06; arc: 21.1 years). Retrieved 15 November 2011.
  9. [9]
    "1998KJ9 Ephemerides for 31 December 1914". NEODyS (Near Earth Objects - Dynamic Site). Retrieved 15 November 2011.
  10. [10]
    Marchis, F.; et al. "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved 24 August 2018.
Preceded by
 Large NEO Earth close approach
(inside the orbit of the Moon)
31 December 1914		 Succeeded by
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