The 680 - 1500 metre wide asteroid (217807) 2000 XK44 will make a close pass (28.8 Lunar Distances, 0.0739 AU), travelling at 7.48 km/s, to the Earth-Moon system on the 4th November, 2009. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).