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Small Solar System bodies
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| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 26 July 1998 |
| Designations | |
| (85640) 1998 OX4 | |
| MPO 267962 | |
| Orbital characteristics[1][2][3] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 3656 days (10.01 yr) |
| Aphelion | 2.347918212 AU (351.2435651 Gm) |
| Perihelion | 0.81264205 AU (121.569520 Gm) |
| 1.580280132 AU (236.4065429 Gm) | |
| Eccentricity | 0.4857608 |
| 1.99 yr (725.60 d) | |
| 227.77555° | |
| 0° 29m 46.099s / day | |
| Inclination | 4.5134807° |
| 299.70814° | |
| 117.10906° | |
| Earth MOID | 0.00103632 AU (155,031 km) |
| Jupiter MOID | 3.03959 AU (454.716 Gm) |
| Physical characteristics | |
| Dimensions | 300–600 m[a][4] |
| 21.1[1] | |
(85640) 1998 OX4 (provisional designation 1998 OX4) is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.
It was discovered on 26 July 1998 by the Spacewatch program and subsequently lost. It was re-discovered by the Near-Earth Asteroid Tracking (NEAT) project on 31 August 2002, as 2002 PJ34. It was removed from the Sentry Risk Table on 8 August 2002.[5] It has a well determined orbit with an observation arc of more than 10 years. It is included in the Minor Planet Center list of Potentially Hazardous Asteroids (PHAs) as it comes to within 0.05 AU of Earth periodically. It is also a Mars crossing asteroid
| Asteroid | Date | Nominal approach distance (LD) | Min. distance (LD) | Max. distance (LD) | Absolute magnitude (H) | Size (meters) |
|---|---|---|---|---|---|---|
| (152680) 1998 KJ9 | 1914-12-31 | 0.606 | 0.604 | 0.608 | 19.4 | 279–900 |
| (458732) 2011 MD5 | 1918-09-17 | 0.911 | 0.909 | 0.913 | 17.9 | 556–1795 |
| (163132) 2002 CU11 | 1925-08-30 | 0.903 | 0.901 | 0.905 | 18.5 | 443–477 |
| 2002 JE9 | 1971-04-11 | 0.616 | 0.587 | 0.651 | 21.2 | 122–393 |
| 2012 TY52 | 1981-11-04 | 0.818 | 0.813 | 0.823 | 21.4 | 111–358 |
| 2017 VW13 | 2001-11-08 | 0.454 | 0.318 | 3.436 | 20.7 | 153–494 |
| (308635) 2005 YU55 | 2011-11-08 | 0.845 | 0.845 | 0.845 | 21.9 | 320–400 |
| (153814) 2001 WN5 | 2028-06-26 | 0.647 | 0.647 | 0.647 | 18.2 | 921–943 |
| 99942 Apophis | 2029-04-13 | 0.0981 | 0.0963 | 0.1000 | 19.7 | 310–340 |
| 2005 WY55 | 2065-05-28 | 0.865 | 0.856 | 0.874 | 20.7 | 153–494 |
| (308635) 2005 YU55 | 2075-11-08 | 0.592 | 0.499 | 0.752 | 21.9 | 320–400 |
| (456938) 2007 YV56 | 2101-01-02 | 0.621 | 0.615 | 0.628 | 21.0 | 133–431 |
| 101955 Bennu | 2135-09-25 | 0.780 | 0.308 | 1.406 | 20.19 | 472–512 |
| (153201) 2000 WO107 | 2140-12-01 | 0.634 | 0.631 | 0.637 | 19.3 | 427–593 |
| (85640) 1998 OX4 | 2148-01-22 | 0.771 | 0.770 | 0.771 | 21.1 | 127–411 |
| 2011 LT17 | 2156-12-16 | 0.998 | 0.955 | 1.215 | 21.6 | 101–327 |
