The 25 - 56 metre wide asteroid 2009 XK8 made a close pass (16.1 lunar distances, 0.0414 AU), travelling at 10.64 km/second, to the Earth-Moon system on the 11th December, 2009.
Orbital elements: 2009 XK8 Earth MOID = 0.0272 AU Epoch 2010 Jan. 4.0 TT = JDT 2455200.5 MPC M 12.17554 (2000.0) P Q n 0.25877065 Peri. 300.61765 +0.67261769 -0.73859170 a 2.4388928 Node 107.04079 +0.69416934 +0.60848860 e 0.6079542 Incl. 2.72605 +0.25634813 +0.29021359 P 3.81 H 25.1 G 0.15 U 8