The 180 - 410 metre wide asteroid 2003 BB21 made a close pass (54.0 lunar distances, 0.1387 AU), travelling at 12.46 km/second, to the Earth-Moon system on the 28th February, 2013 @ 10:13 UT ±00:01.
Orbital elements:
2003 BB21 PHA, Earth MOID = 0.0292 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5 MPC
M 307.88214 (2000.0) P Q
n 0.29521708 Peri. 212.72819 -0.95618056 +0.29189991
a 2.2337868 Node 344.19598 -0.24754203 -0.84733909
e 0.5535898 Incl. 4.77132 -0.15633836 -0.44363377
P 3.34 H 20.9 G 0.15 U 1