The 330 - 750 metre wide asteroid (436724) 2011 UW158 will make a close pass (6.4 LD, 0.0164 AU) travelling at 6.04 km/second, to the Earth-Moon system on the 19th July 2015 @ 14:37 UT ±00:01.
Orbital elements:
2011 UW158 PHA, Earth MOID = 0.0027 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 MPC
M 326.12920 (2000.0) P Q
n 0.47946208 Peri. 8.52525 +0.41951731 +0.90440742
a 1.6167140 Node 286.30842 -0.83754885 +0.35260360
e 0.3750875 Incl. 4.64944 -0.35002449 +0.24024555
P 2.06 H 19.4 G 0.15 U 2
Orbital elements:
2011 UW158 PHA, Earth MOID = 0.0132 AU
Epoch 2011 Oct. 26.0 TT = JDT 2455860.5 MPC
M 70.32927 (2000.0) P Q
n 0.48575123 Peri. 7.20031 +0.37593244 +0.92309440
a 1.6027291 Node 284.90805 -0.85430976 +0.31137167
e 0.3755705 Incl. 4.81212 -0.35892846 +0.22570869
P 2.03 H 19.3 G 0.15
From 29 observations 2011 Oct. 25-27.