The 310 - 680 metre wide asteroid 2014 HF177 will make a close pass (50.8 lunar distances, 0.1305 AU), travelling at 7.82 km/second, to the Earth-Moon system on the 30th July 2014 @ 06:37 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).