The 200 - 440 metre wide asteroid 2005 WC1 will make a close pass (71.9 lunar distances, 0.1848 AU), travelling at 21.98 km/second, to the Earth-Moon system on the 5th December, 2010 @ 21:51 UT. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
Orbital elements: 2005 WC1 PHA, Earth MOID = 0.0148 AU Epoch 2008 Nov. 30.0 TT = JDT 2454800.5 MPC M 253.52003 (2000.0) P Q n 0.59462598 Peri. 256.60145 -0.89115491 -0.29974501 a 1.4005764 Node 265.11908 +0.41546393 -0.84076652 e 0.4865966 Incl. 19.98787 -0.18229822 -0.45084874 P 1.66 H 20.7 G 0.15 U 2