* Astronomy

The 9 - 20 metre wide asteroid 2013 SK20 will make a close pass (2.3 lunar distances, 0.0058 AU), travelling at 11.30 km/second, to the Earth-Moon system on the 29th September, 2013 @ 00:11 UT ±00:01. 

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