(152680) 1998 KJ9

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(152680) 1998 KJ9
Discovery[1]
Discovered by LINEAR (704)
1.0-m Reflector
Discovery site Lincoln Lab's ETS
Discovery date 27 May 1998
Designations
MPC designation (152680) 1998 KJ9
NEO · PHA · Apollo[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 7706 days (21.10 yr)
Aphelion 2.3742 AU (355.18 Gm) (Q)
Perihelion 0.52125 AU (77.978 Gm) (q)
1.4477 AU (216.57 Gm) (a)
Eccentricity 0.63995 (e)
1.74 yr (636.25 d)
6.2670° (M)
0° 33m 56.952s / day (n)
Inclination 10.932° (i)
98.675° (Ω)
259.95° (ω)
Earth MOID 0.00552 AU (826,000 km)
Physical characteristics
Dimensions ~500 meters[3]
Mass 7.87×1010 kg[4]
19.4[2]

(152680) 1998 KJ9 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.[2]

Description[edit]

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,[5] it was recovered on 28 December 2003 which extended the observation arc by 5 years.[6] Two precovery images from January 1990 extended the observation arc by 8 years.[5]

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).[7] 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.[8]

References[edit]

  1. ^ a b "MPEC 1998-K31 : 1998 KJ9". IAU Minor Planet Center. 1998-05-29. Retrieved 2011-11-15.  (J98K09J)
  2. ^ a b c d e "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. ^ a b "Near Earth Asteroids (NEAs)" (Version 20.1). International Astronomical Union. 13 October 2011. Retrieved 2011-10-30. 
  4. ^ "Asteroid General Data - 1998 KJ9 (152680)". Catalogue of the Solar System Small Bodies Orbital Evolution. Retrieved 2011-11-15. 
  5. ^ a b "(152680) = 1998 KJ9 Orbit" (2011-02-06; arc=7706 days). Minor Planet Center. Retrieved 2013-09-24. 
  6. ^ "MPEC 2003-Y87 : 1998 KJ9". IAU Minor Planet Center. 2003-12-29. Retrieved 2013-09-24. 
  7. ^ "JPL Close-Approach Data: 152680 (1998 KJ9)" (last observation: 2011-02-06; arc: 21.1 years). Retrieved 2011-11-15. 
  8. ^ "1998KJ9 Ephemerides for 31 December 1914". NEODyS (Near Earth Objects - Dynamic Site). Retrieved 2011-11-15. 

External links[edit]

Preceded by
Large NEO Earth close approach
(inside the orbit of the Moon)

31 December 1914
Succeeded by
(163132) 2002 CU11