* Astronomy

The 57 - 130 metre wide asteroid 2013 XV18 will make a close pass (51.4 lunar distances, 0.1320 AU), travelling at 8.95 km/second, to the Earth-Moon system on the 21st December 2013 @ 17:31 UT ±00:03. 

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