The 27 - 60 metre wide asteroid 2013 RO21 will make a close pass (25.8 lunar distances, 0.0662 AU), travelling at 7.10 km/second, to the Earth-Moon system on the 6th September, 2013 @ 14:56 UT ±01:42.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
