The 8 - 18 metre wide asteroid 2011 UB made a close pass (5.0 lunar distances, 0.0129 AU), travelling at 6.35 km/second, to the Earth-Moon system on the 17th October, 2011 @ 01:30 UT ±00:02.
Orbital elements:
2011 UB Earth MOID = 0.0112 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 338.65833 (2000.0) P Q
n 0.36892569 Peri. 8.02805 +0.85406931 -0.51999551
a 1.9253519 Node 23.31819 +0.47538671 +0.77012760
e 0.4773703 Incl. 1.88916 +0.21112341 +0.36947009
P 2.67 H 27.5 G 0.15 U 7