The 660 - 1500 metre wide asteroid 2001 PJ9 will make a close pass (29.2 lunar distances, 0.0751 AU), travelling at 17.79 km/second, to the Earth-Moon system on the 17th July, 2013 @ 23:08 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).
