* Astronomy

The 1300 - 2900 metre wide asteroid 1999 YK5 will make a close pass (49.1 lunar distances, 0.1263 AU), travelling at 20.21 km/second, to the Earth-Moon system on the 15th February, 2013 @ 10:18 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).