Update: The 280 - 620 metre wide asteroid 2008 XM made a close pass (30.8 lunar distances, 0.0792 AU), travelling at 33.96 km/second, to the Earth-Moon system on the 18th January, 2010.
The 290 - 640 metre wide asteroid 2008 XM will make a close pass (30.8 lunar distances, 0.0791 AU), travelling at 34.03 km/second, to the Earth-Moon system on the 18th January, 2010.