The 700 - 1600 metre wide asteroid 1999 CF9 made a close pass (24.7 lunar distances, 0.0634 AU), travelling at 18.92 km/second, to the Earth-Moon system on the 23rd August, 2013 @ 00:28 UT ±00:01.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
