The 210 - 470 metre wide asteroid 2011 OW4 will make a close pass (73.7 lunar distances, 0.1893 AU), travelling at 22.19 km/second, to the Earth-Moon system on the 14th August, 2011 @ 05:39 UT ±00:25.
Orbital elements:
2011 OW4 Earth MOID = 0.1888 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 347.38195 (2000.0) P Q
n 0.35714716 Peri. 163.08590 +0.53109979 -0.82494709
a 1.9674540 Node 254.44773 +0.75231247 +0.56410944
e 0.7213982 Incl. 11.57954 +0.38981913 +0.03525394
P 2.76 H 20.8 G 0.15 U 8