The 9 - 20 metre wide asteroid 2011 BJ39 made a close pass (12.3 lunar distances, 0.0315 AU), travelling at 4.87 km/second, to the Earth-Moon system on the 28th January, 2011 @ 07:23 UT ±04:21.
Orbital elements: 2011 BJ39 Earth MOID = 0.0304 AU Epoch 2011 Feb. 8.0 TT = JDT 2455600.5 MPC M 7.48207 (2000.0) P Q n 0.53667846 Peri. 351.66562 -0.56595601 -0.82183501 a 1.4996616 Node 132.77366 +0.76145122 -0.55149374 e 0.3238306 Incl. 5.11390 +0.31604721 -0.14297510 P 1.84 H 27.5 G 0.15 U 9