The 6 - 14 metre wide asteroid 2010 WK1 made a close pass (1.1 lunar distances, 0.0199 AU), travelling at 10.09 km/second, to the Earth-Moon system on the 27th November, 2010 @ 18:30 UT.
Orbital elements: 2010 WK1 Earth MOID = 0.0019 AU Epoch 2010 Nov. 20.0 TT = JDT 2455520.5 MPC M 353.68783 (2000.0) P Q n 0.23861636 Peri. 205.02391 +0.00300073 -0.99522390 a 2.5743598 Node 244.93189 +0.93464966 +0.03748419 e 0.6293477 Incl. 6.18385 +0.35555733 -0.09013509 P 4.13 H 28.2 G 0.15 From 14 observations 2010 Nov. 27.