* Astronomy

The 520 - 1200 metre wide asteroid 2001 WC47 will make a close pass (39.4 lunar distances, 0.1013 AU), travelling at 3.80 km/second, to the Earth-Moon system on the 19th April, 2012 @ 21:30 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).