* Astronomy

The 78 - 180 metre wide asteroid 2013 YD48 will make a close pass (20.1 lunar distances, 0.0516 AU), travelling at 13.83 km/second, to the Earth-Moon system on the 14th January 2014 @ 22:46 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).