The 160 - 350 metre wide asteroid 2011 TN9 made a close pass (24.5 lunar distances, 0.0631 AU), travelling at 6.79 km/second, to the Earth-Moon system on the 10th October, 2011 @ 04:27 UT ±1 day 07:50.
Orbital elements:
2011 TN9 PHA, Earth MOID = 0.0444 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 347.46254 (2000.0) P Q
n 0.37630386 Peri. 162.97548 +0.99897726 -0.03856308
a 1.9001021 Node 199.28090 +0.02844461 +0.94184475
e 0.4513727 Incl. 4.09990 +0.03514752 +0.33382834
P 2.62 H 21.1 G 0.15 U 8