The 25 - 55 metre wide asteroid 2015 RG83 will make a close pass (60.1 LD, 0.1544 AU) travelling at 4.52 km/second, to the Earth-Moon system on the 19th September 2015 @ 19:07 UT ±01:41.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).