* Astronomy

The 100 - 220 metre wide asteroid 2007 AA9 will make a close pass (66.6 lunar distances, 0.1710 AU), travelling at 7.86 km/second, to the Earth-Moon system on the 11th January, 2011 @ 21:34 UT ±00:31.

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