(152680) 1998 KJ9
| Discovery[1] | |
|---|---|
| Discovered by |
LINEAR (704) 1.0-m Reflector |
| Discovery date | 27 May 1998 |
| Designations | |
| MPC designation | (152680) 1998 KJ9 |
|
Apollo NEO, PHA[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) |
| Jupiter MOID | 3.1268 AU (467.76 Gm) |
| 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] (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
- 1 2 "MPEC 1998-K31 : 1998 KJ9". IAU Minor Planet Center. 1998-05-29. Retrieved 2011-11-15. (J98K09J)
- 1 2 3 4 5 6 "JPL Small-Body Database Browser: 152680 (1998 KJ9)" (last observation: 2011-02-06; arc: 21.1 years). Jet Propulsion Laboratory. Retrieved 7 April 2016.
- 1 2 "Near Earth Asteroids (NEAs)" (Version 20.1). International Astronomical Union. 13 October 2011. Retrieved 2011-10-30.
- ↑ "Asteroid General Data - 1998 KJ9 (152680)". Catalogue of the Solar System Small Bodies Orbital Evolution. Retrieved 2011-11-15.
- 1 2 "(152680) = 1998 KJ9 Orbit" (2011-02-06; arc=7706 days). Minor Planet Center. Retrieved 2013-09-24.
- ↑ "MPEC 2003-Y87 : 1998 KJ9". IAU Minor Planet Center. 2003-12-29. Retrieved 2013-09-24.
- ↑ "JPL Close-Approach Data: 152680 (1998 KJ9)" (last observation: 2011-02-06; arc: 21.1 years). Retrieved 2011-11-15.
- ↑ "1998KJ9 Ephemerides for 31 December 1914". NEODyS (Near Earth Objects - Dynamic Site). Retrieved 2011-11-15.
External links
- Orbital simulation from JPL (Java) / Ephemeris
- (152680) 1998 KJ9 at the JPL Small-Body Database
| Preceded by |
Large NEO Earth close approach (inside the orbit of the Moon) 31 December 1914 |
Succeeded by (163132) 2002 CU11 |