The 110 - 250 metre wide asteroid 2002 LT24 will make a close pass (23.0 lunar distances, 0.0592 AU), travelling at 8.96 km/second, to the Earth-Moon system on the 25th June, 2013 @ 14:02 UT ±00:01.
Update The 110 - 240 metre wide asteroid 2002 LT24 made a close pass (61.4 lunar distances, 0.1578 AU), travelling at 15.50 km/second, to the Earth-Moon system on the 13th July, 2010 @ 20:53 UT.
The 110 - 240 metre wide asteroid 2002 LT24 will make a close pass (56.1 lunar distances, 0.1441 AU), travelling at 15.01 km/second, to the Earth-Moon system on the 14th July, 2010 @ 03:41 UT.