* Astronomy

The 63 - 140 metre wide asteroid 2013 YP2 will make a close pass (55.8 lunar distances, 0.1435 AU), travelling at 6.32 km/second, to the Earth-Moon system on the 29th December 2013 @ 16:28 UT ±06:38. 

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