(152680) 1998 KJ9
(152680) 1998 KJ9 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.
| Discovery | |
|---|---|
| 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 |
Minor planet category | NEO · PHA · Apollo |
| Orbital characteristics | |
| 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) |
Semi-major axis | 1.4477 AU (216.57 Gm) (a) |
| Eccentricity | 0.63995 (e) |
Orbital period (sidereal) | 1.74 yr (636.25 d) |
Mean anomaly | 6.2670° (M) |
Mean motion | 0° 33m 56.952s / day (n) |
| Inclination | 10.932° (i) |
Longitude of ascending node | 98.675° (Ω) |
| 259.95° (ω) | |
| Earth MOID | 0.00552 AU (826,000 km) |
| Physical characteristics | |
| Dimensions | ~500 meters |
| Mass | 7.87×1010 kg |
| 19.4 | |
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