(152680) 1998 KJ9

From Wikipedia, the free encyclopedia
Jump to: navigation, search
(152680) 1998 KJ9
Discovery[1]
Discovered by LINEAR (704)
1.0-m Reflector
Discovery date 27 May 1998
Designations
MPC designation (152680) 1998 KJ9
Minor planet category Apollo NEO,
PHA[2]
Orbital characteristics[2]
Epoch 2011-Aug-27
(Uncertainty=0)[2]
Aphelion 2.3743 AU (Q)
Perihelion 0.52157 AU (q)
1.4479 AU (a)
Eccentricity 0.63978
1.74 yr
181.06° (M)
Inclination 10.932°
98.712°
259.92°
Physical characteristics
Dimensions ~500 meters[3]
Mass 7.87×1010 kg[4]
19.4[2]

(152680) 1998 KJ9 is a near-Earth asteroid and potentially hazardous object.[2] It has a well determined orbit with an excellent observation arc of 21 years and an Uncertainty Parameter of 0.[2]

It was discovered on 27 May 1998 by the Lincoln Near-Earth Asteroid Research (LINEAR) 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] 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 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 f g "JPL Small-Body Database Browser: 152680 (1998 KJ9)". Jet Propulsion Laboratory. 2011-02-06 last obs (arc=21.1 years). Retrieved 2011-11-15. 
  3. ^ a b "Near Earth Asteroids (NEAs)". International Astronomical Union. 13 October 2011 – Version 20.1. 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". Minor Planet Center. 2011-02-06 (arc=7706 days). 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)". 2011-02-06 last obs (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