* Astronomy

The 380 - 850 metre wide asteroid 1998 SC15 will make a close pass (47.3 lunar distances, 0.1215 AU), travelling at 16.79 km/second, to the Earth-Moon system on the 18th October, 2011 @ 18:12 UT ±00:11.

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