The 24 - 53 metre wide asteroid 2013 XW8 will make a close pass (18.6 lunar distances, 0.0477 AU), travelling at 6.89 km/second, to the Earth-Moon system on the 10th December, 2013 @ 19:08 UT ±00:06.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).