The 24 - 53 metre wide asteroid 1999 CG9 will make a close pass (36.9 lunar distances, 0.0948 AU), travelling at 4.45 km/second, to the Earth-Moon system on the 31st January, 2011 @ 20:18 UT ±00:01. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).