The 5 - 12 metre wide asteroid 2011 AN52 made a close pass (0.8 lunar distances, 0.0021 AU), travelling at 15.93 km/second, to the Earth-Moon system on the 17th January, 2011 @ 23:19 UT ±00:01.
Orbital elements: 2011 AN52 Earth MOID = 0.0021 AU Epoch 2011 Feb. 8.0 TT = JDT 2455600.5 MPC M 345.25649 (2000.0) P Q n 0.52390634 Peri. 84.91409 -0.94741762 +0.31854174 a 1.5239368 Node 113.65795 -0.30521015 -0.87085981 e 0.5481662 Incl. 1.90901 -0.09615937 -0.37434522 P 1.88 H 28.7 G 0.15 U 8