2010 WC9
2010 WC9, unofficially designated ZJ99C60, is a sub-kilometer near-Earth asteroid of the Apollo group, approximately 100 meters (330 feet) in diameter. First observed for eleven days by the Catalina Sky Survey in 2010, the asteroid was recovered in May 2018 during its sub-lunar close encounter with Earth.
Orbit of 2010 WC9 with positions before 2018 flyby | |
| Discovery | |
|---|---|
| Discovered by | Catalina Sky Srvy. |
| Discovery site | Catalina Stn. (first observed only) |
| Discovery date | 30 November 2010 |
| Designations | |
MPC designation | 2010 WC9 |
Alternative designations | ZJ99C60 |
Minor planet category |
|
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 7.45 yr (2,721 d) |
| Aphelion | 1.3797 AU |
| Perihelion | 0.7784 AU |
Semi-major axis | 1.0791 AU |
| Eccentricity | 0.2786 |
Orbital period (sidereal) | 1.12 yr (409 d) |
Mean anomaly | 251.06° |
Mean motion | 0° 52m 45.48s / day |
| Inclination | 17.994° |
Longitude of ascending node | 54.655° |
| 273.53° | |
| Earth MOID | 0.00138 AU (0.5454 LD) |
| Venus MOID | 0.158 AU (23,600,000 km) |
| Physical characteristics | |
Mean diameter | |
Synodic rotation period | 8–20 minutes |
| 23.5 | |
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