The 120 - 270 metre wide asteroid 1998 HE3 will make a close pass (12.4 lunar distances, 0.0319 AU), travelling at 11.93 km/second, to the Earth-Moon system on the 10th May, 2012 @ 18:01 UT ±00:01.
The 120 - 270 metre wide asteroid 1998 HE3 will make a close pass (37.9 lunar distances, 0.0973 AU), travelling at 15.17 km/second, to the Earth-Moon system on the 3rd February, 2011 @ 06:40 UT ±00:01. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).