The 13 - 28 metre wide asteroid 2017 GT4 will make a close pass (3.5 LD, 0.0090 AU), travelling at 9.28 km/second, to the Earth-Moon system on the 9th April 2017 @ 01:29 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).