The 200 - 440 metre wide asteroid 2009 SB170 will make a close pass (69.6 lunar distances, 0.1789 AU), travelling at 32.39 km/second, to the Earth-Moon system on the 29th September, 2012 @ 00:33 UT ±00:01.
Orbital elements:
2009 SB170 Earth MOID = 0.1012 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5 MPC
M 263.70440 (2000.0) P Q
n 0.63154929 Peri. 44.93485 -0.59259351 +0.80100475
a 1.3454407 Node 189.85148 -0.80480446 -0.58438581
e 0.7423147 Incl. 29.78700 +0.03350689 +0.12994077
P 1.56 H 20.8 G 0.15 U 3
Orbital elements: 2009 SB170 Earth MOID = 0.0979 AU Epoch 2009 June 18.0 TT = JDT 2455000.5 MPC M 352.53886 (2000.0) P Q n 0.69152796 Peri. 43.70741 -0.61539308 +0.78455669 a 1.2664738 Node 189.26161 -0.78810431 -0.61078990 e 0.7230288 Incl. 28.14156 +0.01352616 +0.10680120 P 1.43 H 20.6 G 0.15 U 9