2019 OK
2019 OK is a near-Earth asteroid noted for its sudden, surprise discovery on the day before its close flyby in 2019. The object's size is estimated at 57 to 130 metres (187 to 426 ft) across, the closest asteroid of such size discovered in 2019. It is uncommon for asteroids of this moderately large size to pass within 100,000 km (62,000 mi) of Earth.
2019 OK orbits near the ecliptic plane out to the asteroid belt and inside the orbit of Venus | |
| Discovery | |
|---|---|
| Discovered by | SONEAR Obs. |
| Discovery site | SONEAR Obs. (Y00) |
| Discovery date | 24 July 2019 |
| Designations | |
MPC designation | 2019 OK |
Alternative designations | NEOCP S511618 |
Minor planet category | Apollo · NEO |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 1 | |
| Observation arc | 2.42 years |
| Earliest precovery date | 2017-02-21 (Pan-STARRS) |
| Aphelion | 3.4315 AU |
| Perihelion | 0.4635 AU |
Semi-major axis | 1.9475 AU |
| Eccentricity | 0.7620 |
Orbital period (sidereal) | 2.72 yr (993 d) |
Mean anomaly | 310.58° |
Mean motion | 0° 21m 45.36s / day |
| Inclination | 1.4006° |
Longitude of ascending node | 302.27° |
| 104.24° | |
| Earth MOID | 0.00036 AU (54,000 km) (0.14 LD) |
| Physical characteristics | |
Mean diameter | 57–130 m (187–426 ft) |
| 23.3±0.3 23.3 | |
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