The 22 - 50 metre wide asteroid 2007 JB21 will make a close pass (39.4 Lunar Distances, 0.1012 AU), travelling at 8.93 km/s, to the Earth-Moon system on the 29th October, 2010 @ 05:24 UT.
The 22 - 50 metre wide asteroid 2007 JB21 will make a close pass (21.8 Lunar Distances, 0.0559 AU), travelling at 7.47 km/s, to the Earth-Moon system on the 9th November, 2009.