* Astronomy

The 38 - 86 metre wide asteroid 2013 XX8 will make a close pass (19.7 lunar distances, 0.0506 AU), travelling at 2.81 km/second, to the Earth-Moon system on the 4th January 2014 @ 16:46 UT ±00:07. 

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