* Astronomy

The 44 - 99 metre wide asteroid 2013 SE21 will make a close pass (29.6 lunar distances, 0.0760 AU), travelling at 6.82 km/second, to the Earth-Moon system on the 12th October 2013 @ 13:02 UT ±00:01. 

See more

The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).