The 17 - 38 metre wide asteroid 2013 AC4 made a close pass (2.6 lunar distances, 0.0068 AU), travelling at 20.09 km/second, to the Earth-Moon system on the 30th December, 2012 @ 06:18 UT ±00:03.
Orbital elements:
2013 AC4 Earth MOID = 0.0034 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5 MPC
M 335.89872 (2000.0) P Q
n 0.59077605 Peri. 254.62658 +0.99695966 +0.05718824
a 1.4066546 Node 102.07319 -0.03233117 +0.92159322
e 0.6244854 Incl. 3.10242 -0.07089524 +0.38392114
P 1.67 H 26.0 G 0.15 U 8