The 230 - 510 metre wide asteroid 2011 BB will make a close pass (42.9 lunar distances, 0.1104 AU), travelling at 9.63 km/second, to the Earth-Moon system on the 5th May, 2011 @ 21:14 UT ±1 days 13:59.
Orbital elements: 2011 BB Earth MOID = 0.0743 AU Epoch 2011 Feb. 8.0 TT = JDT 2455600.5 MPC M 344.71648 (2000.0) P Q n 0.22368524 Peri. 244.83793 -0.93149959 +0.35588556 a 2.6876817 Node 315.90363 -0.28253343 -0.83810204 e 0.6342150 Incl. 6.20330 -0.22909252 -0.41343736 P 4.41 H 20.3 G 0.15 U 8