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Orbital elements:
2012 PD20                                                Earth MOID = 0.0243 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M  15.81644              (2000.0)            P               Q
n   0.39162631     Peri.  191.35892     +0.84796771     +0.52825710
a   1.8502119      Node   136.66182     -0.48120477     +0.80166515
e   0.4408984      Incl.    3.63686     -0.22224476     +0.27978103
P   2.52           H   25.4           G   0.15           U   6

MPEC 2012 - Q07

The 22 - 50 metre wide asteroid 2012 PD20 will make a close pass (9.6 lunar distances, 0.0248 AU), travelling at 6.07 km/second, to the Earth-Moon system on the 18th August, 2012 @ 03:59 UT ±00:09. 

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