* Astronomy

The 70 - 160 metre wide asteroid 2013 YF will make a close pass (59.2 lunar distances, 0.1521 AU), travelling at 14.22 km/second, to the Earth-Moon system on the 27th December 2013 @ 23:24 UT ±00:17. 

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