2010 WC₉

2010 WC₉
	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	NEO; Apollo;
Orbital characteristics
	Epoch 21 November 2025 (JD 2461000.5)
	Uncertainty parameter 0
Observation arc	7.46 yr (2,723 d)
Aphelion	1.3727 AU
Perihelion	0.7652 AU
Semi-major axis	1.0689 AU
Eccentricity	0.2841
Orbital period (sidereal)	1.11 yr (404 d)
Mean anomaly	225.55°
Mean motion	0° 53m 30.48s / day
Inclination	17.681°
Longitude of ascending node	54.598°
Argument of perihelion	275.96°
Earth MOID	0.00000867 AU (0.00338 LD)
Venus MOID	0.14214 AU (21,264,000 km)
Physical characteristics
Mean diameter	60–130 m; 60 m (est. at 0.20); 130 m (est. at 0.04);
Synodic rotation period	0.18469 hours
Absolute magnitude (H)	23.66

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.