The 13 - 29 metre wide asteroid 2010 PH9 made a close pass (6.3 lunar distances, 0.0161 AU), travelling at 6.96 km/second, to the Earth-Moon system on the 4th August, 2010 @ 18:05 UT. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
Orbital elements: 2010 PH9 Earth MOID = 0.0162 AU Epoch 2010 July 23.0 TT = JDT 2455400.5 MPC M 349.64316 (2000.0) P Q n 0.69441207 Peri. 182.18706 +0.69805518 +0.69896388 a 1.2629647 Node 132.13446 -0.65373417 +0.71069132 e 0.1840348 Incl. 12.10116 -0.29214823 +0.07979564 P 1.42 H 26.5 G 0.15 U 7