* Astronomy

Orbital elements:
2013 ER                                                  Earth MOID = 0.0384 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M  17.68939              (2000.0)            P               Q
n   0.39395690     Peri.  182.73345     -0.95500906     -0.29525529
a   1.8429077      Node   340.02502     +0.27363303     -0.84083797
e   0.4411140      Incl.    4.69551     +0.11437944     -0.45366929
P   2.50           H   25.6           G   0.15           U   7

MPEC 2013 - E12

Key to Orbital elements

The 20 - 45 metre wide asteroid 2013 ER will make a close pass (15.4 lunar distances, 0.0395 AU), travelling at 5.84 km/second, to the Earth-Moon system on the 6th March, 2013 @ 17:41 UT ±00:50. 

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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).