* Astronomy

The 22 - 48 metre wide asteroid 2013 XG10 will make a close pass (11.2 lunar distances, 0.0288 AU), travelling at 8.23 km/second, to the Earth-Moon system on the 19th December, 2013 @ 01:56 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).