The 290 - 640 metre wide asteroid 2011 OV18 will make a close pass (19.3 lunar distances, 0.0495 AU), travelling at 12.09 km/second, to the Earth-Moon system on the 20th December, 2011 @ 21:07 UT ±00:08.
Orbital elements:
2011 OV18 PHA, Earth MOID = 0.0241 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 316.20625 (2000.0) P Q
n 0.47237763 Peri. 148.81450 +0.47329978 -0.83122854
a 1.6328383 Node 271.46195 +0.73615278 +0.55504500
e 0.4397755 Incl. 16.96109 +0.48380410 -0.03137145
P 2.09 H 19.9 G 0.15 U 8