The 670 - 1500 metre wide asteroid 405212 (2003 QC10) will make a close pass (56.8 lunar distances, 0.14598 AU), travelling at 27.68 km/second, to the Earth on the 27th May 2018 @ 14:06 UT ±00:01.
The 710 - 1600 metre wide asteroid 2003 QC10 will make a close pass (50.0 lunar distances, 0.1284 AU), travelling at 27.87 km/second, to the Earth-Moon system on the 18th September, 2011 @ 23:54 UT ±00:01.