* Astronomy

The 28 - 62 metre wide asteroid 2013 SC21 will make a close pass (8.8 lunar distances, 0.0226 AU), travelling at 11.72 km/second, to the Earth-Moon system on the 7th October 2013 @ 08:43 UT ±00:01. 

See more

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