The 220 - 490 metre wide asteroid 2002 AV31 will make a close pass (73.0 lunar distances, 0.1877 AU), travelling at 11.52 km/second, to the Earth-Moon system on the 11th August, 2010 @ 06:06 UT. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).