The 410 - 920 metre wide asteroid 2000 RN77 will make a close pass (76.1 lunar distances, 0.1955 AU), travelling at 9.87 km/second, to the Earth-Moon system on the 3rd August, 2012 @ 17:00 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).