The 87 - 190 metre wide asteroid 2013 OU3 will make a close pass (70.4 lunar distances, 0.1808 AU), travelling at 6.58 km/second, to the Earth-Moon system on the 25th August, 2013 @ 23:41 UT ±00:03.
Orbital elements:
2013 OU3 Earth MOID = 0.1732 AU
Epoch 2013 July 7.0 TT = JDT 2456480.5 MPC
M 347.93506 (2000.0) P Q
n 0.25560735 Peri. 172.45074 +0.89532987 +0.44272073
a 2.4589733 Node 161.03785 -0.41609904 +0.87048068
e 0.5190195 Incl. 8.63982 -0.15888996 +0.21508542
P 3.86 H 22.8 G 0.15
From 7 observations 2013 July 17-18.