The 61 - 140 metre wide asteroid 2010 RJ43 will make a close pass (51.0 LD, 0.1309 AU) travelling at 11.59 km/second, to the Earth-Moon system on the 23rd August 2015 @ 21:51 UT ±05:45.
Update: The 59 - 130 metre wide asteroid 2010 RJ43 will make a close pass (75.1 lunar distances, 0.1930 AU), travelling at 10.66 km/second, to the Earth-Moon system on the 26th November, 2011 @ 13:07 UT ±08:09.
The 59 - 130 metre wide asteroid 2010 RJ43 will make a close pass (75.3 lunar distances, 0.1935 AU), travelling at 10.65 km/second, to the Earth-Moon system on the 26th November, 2011 @ 11:58 UT ±09:43.