The 130 - 290 metre wide asteroid 2001 OT will make a close pass (54.8 lunar distances, 0.1407 AU), travelling at 8.47 km/second, to the Earth-Moon system on the 23rd July, 2010 @ 06:48 UT. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).