The 170 - 370 metre wide asteroid 2010 CJ171 will make a close pass (46.3 lunar distances, 0.1190 AU), travelling at 7.14 km/second, to the Earth-Moon system on the 18th June, 2010. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
Orbital elements: 2010 CJ171 Earth MOID = 0.1147 AU Epoch 2010 July 23.0 TT = JDT 2455400.5 MPC M 18.43740 (2000.0) P Q n 0.34922765 Peri. 99.61074 -0.38602822 +0.91989320 a 1.9970869 Node 147.40862 -0.88869839 -0.35074763 e 0.4891191 Incl. 7.37353 -0.24738104 -0.17542120 P 2.82 H 21.0 G 0.15 U 6