* Astronomy

The 19 - 43 metre wide asteroid 2013 WD44 will make a close pass (23.2 lunar distances, 0.0595 AU), travelling at 4.88 km/second, to the Earth-Moon system on the 23rd December 2013 @ 21:34 UT ±02:03. 

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