* Astronomy

Orbital elements:
2012 HC20                                                Earth MOID = 0.1149 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5                 MPC
M 330.03419              (2000.0)            P               Q
n   0.26916000     Peri.  262.56320     +0.47679233     +0.85700940
a   2.3757225      Node    37.99281     -0.62772659     +0.48762115
e   0.6528616      Incl.   18.51349     -0.61532788     +0.16661482
P   3.66           H   21.4           G   0.15           U   9

MPEC 2012 - H72

The 140 - 320 metre wide asteroid 2012 HC20 will make a close pass (49.1 lunar distances, 0.1261 AU), travelling at 17.36 km/second, to the Earth-Moon system on the 18th May, 2012 @ 04:45 UT ±02:01. 

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