The 310 - 680 metre wide asteroid 1998 FW4 will make a close pass (17.5 lunar distances, 0.0450 AU), travelling at 20.01 km/second, to the Earth-Moon system on the 24th September, 2013 @ 18:21 UT ±00:01.
The 340 - 760 metre wide asteroid 1998 FW4 will make a close pass (8.6 Lunar Distances, 0.0222 AU), travelling at 18.00 km/s, to the Earth-Moon system on the 29th September, 2009. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).