* Astronomy

The 230 - 510 metre wide asteroid 1996 PC1 will make a close pass (68.6 lunar distances, 0.1762 AU), travelling at 17.97 km/second, to the Earth-Moon system on the 17th August, 2011 @ 19:17 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).