Orbital elements:
2011 UJ21 Earth MOID = 0.0303 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5 MPC
M 215.14480 (2000.0) P Q
n 1.02805526 Peri. 117.69565 -0.79578898 -0.55827460
a 0.9722809 Node 30.21135 +0.24224350 -0.64856421
e 0.2751201 Incl. 27.79284 +0.55501169 -0.51739147
P 0.96 H 23.4 G 0.15 U 8
The 55 - 120 metre wide asteroid 2011 UJ21 will make a close pass (15.5 lunar distances, 0.0399 AU), travelling at 16.21 km/second, to the Earth-Moon system on the 25th October, 2011 @ 08:37 UT ±00:01.