The 14 - 32 metre wide asteroid 2011 UC276 made a close pass (20.0 lunar distances, 0.0513 AU), travelling at 6.76 km/second, to the Earth-Moon system on the 31st October, 2011 @ 15:07 UT ±03:12.
Orbital elements:
2011 UC276 Earth MOID = 0.0505 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 335.29739 (2000.0) P Q
n 0.34522383 Peri. 193.00646 +0.71662614 -0.69476466
a 2.0124984 Node 211.28385 +0.64999738 +0.69711373
e 0.4832562 Incl. 6.77164 +0.25288412 +0.17701556
P 2.85 H 26.4 G 0.15 U 9