Orbital elements:
2013 OR3 Earth MOID = 0.2311 AU
Epoch 2013 July 7.0 TT = JDT 2456480.5 MPC
M 4.09778 (2000.0) P Q
n 0.22655559 Peri. 125.92681 +0.09338247 +0.99326640
a 2.6649323 Node 149.21644 -0.95118808 +0.10934862
e 0.5432939 Incl. 7.69936 -0.29414444 -0.03827180
P 4.35 H 23.0 G 0.15
From 9 observations 2013 July 16-17.