The 460 - 1000 metre wide asteroid 1987 SF3 will make a close pass (63.4 lunar distances, 0.1629 AU), travelling at 11.49 km/second, to the Earth-Moon system on the 17th September 2014 @ 10:34 UT ±00:01.
Orbital elements:
1987 SF3 = 2014 KH2 Earth MOID = 0.0509 AU
Id. T. B. Spahr
Epoch 2014 May 23.0 TT = JDT 2456800.5 MPC
M 332.15952 (2000.0) P Q
n 0.29212730 Peri. 134.39646 +0.78271171 +0.62234245
a 2.2495101 Node 187.12693 -0.58630665 +0.73339380
e 0.5358645 Incl. 3.34000 -0.20882264 +0.27353867
P 3.37 H 18.7 G 0.15 U 3