The 150 - 330 metre wide asteroid 2011 YJ28 will make a close pass (53.8 lunar distances, 0.1383 AU), travelling at 14.19 km/second, to the Earth-Moon system on the 6th July, 2012 @ 01:50 UT ±00:20.
The 190 - 420 metre wide asteroid 2011 YJ28 will make a close pass (55.2 lunar distances, 0.1417 AU), travelling at 14.37 km/second, to the Earth-Moon system on the 14th January, 2012 @ 22:58 UT ±00:04.
Orbital elements:
2011 YJ28 PHA, Earth MOID = 0.0212 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5 MPC
M 304.65635 (2000.0) P Q
n 0.90385407 Peri. 306.07337 -0.47265473 +0.77024665
a 1.0594257 Node 290.13623 -0.58779045 -0.63753870
e 0.0938665 Incl. 27.13123 -0.65658197 +0.01626368
P 1.09 H 20.8 G 0.15 U 8