The 2000 - 4500 metre wide asteroid (4486) Mithra will make a close pass (73.5 Lunar Distances, 0.1890 AU), travelling at 22.64 km/s, to the Earth-Moon system on the 12th March, 2010. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).