The 78 - 170 metre wide asteroid 2011 WC made a close pass (60.3 lunar distances, 0.1550 AU), travelling at 5.08 km/second, to the Earth-Moon system on the 14th November, 2011 @ 21:26 UT ±2 days 12:41.
Orbital elements:
2011 WC Earth MOID = 0.1379 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 250.29961 (2000.0) P Q
n 0.73777652 Peri. 244.92295 -0.35057333 -0.92911247
a 1.2129777 Node 226.13614 +0.90728660 -0.30577530
e 0.1092587 Incl. 9.39379 +0.23222697 -0.20796990
P 1.34 H 22.5 G 0.15 U 9