The 39 - 88 metre wide asteroid 2013 RE36 will make a close pass (35.3 lunar distances, 0.0907 AU), travelling at 23.05 km/second, to the Earth-Moon system on the 12th September, 2013 @ 15:00 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).
