The 400 - 900 metre wide asteroid 2011 AL1 made a close pass (63.4 lunar distances, 0.1629 AU), travelling at 24.56 km/second, to the Earth-Moon system on the 31st December, 2010 @ 22:45 UT ±01:59.
Orbital elements: 2011 AL1 Earth MOID = 0.0634 AU Epoch 2011 Feb. 8.0 TT = JDT 2455600.5 MPC M 21.81193 (2000.0) P Q n 0.32281819 Peri. 318.69437 +0.45258299 -0.65170495 a 2.1045733 Node 95.17479 +0.89009955 +0.37132183 e 0.5436229 Incl. 37.67171 -0.05377201 +0.66136280 P 3.05 H 19.1 G 0.15 U 8