* Astronomy

The 27 - 60 metre wide asteroid 2013 YT102 will make a close pass (16.7 lunar distances, 0.0429 AU), travelling at 8.57 km/second, to the Earth-Moon system on the 4th January 2014 @ 18:39 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).