* Astronomy

The 28 - 63 metre wide asteroid 2010 XM56 will make a close pass (1.7 lunar distances, 0.0045 AU), travelling at 15.29 km/second, to the Earth-Moon system on the 17th December, 2010 @ 09:14 UT ±1 minute.

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