* Astronomy

Orbital elements:
2012 HE31                                                Earth MOID = 0.0042 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5                 MPC
M 300.74459              (2000.0)            P               Q
n   0.61075908     Peri.  271.17598     +0.27674019     +0.96094087
a   1.3758025      Node    14.89064     -0.87735336     +0.25382946
e   0.3909527      Incl.    0.61115     -0.39200248     +0.11028713
P   1.61           H   25.8           G   0.15           U   7

MPEC 2012 - H82 

The 19 - 43 metre wide asteroid 2012 HE31 will make a close pass (2.7 lunar distances, 0.0070 AU), travelling at 10.46 km/second, to the Earth-Moon system on the 30th April, 2012 @ 08:18 UT ±00:01. 

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