* Astronomy

Orbital elements:
2013 PS13                                                Earth MOID = 0.0003 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M 271.38127              (2000.0)            P               Q
n   0.53331646     Peri.  268.41912     +0.65484723     -0.75572731
a   1.5059575      Node   140.66974     +0.69781550     +0.60097056
e   0.5860170      Incl.    0.64781     +0.29022171     +0.26021266
P   1.85           H   27.5           G   0.15           U   6

MPEC 2013 - P45

Key to Orbital elements

The 8 - 18 metre wide asteroid 2013 PS13 made a close pass (0.5 lunar distances, 0.0014 AU), travelling at 17.38 km/second, to the Earth-Moon system on the 9th August, 2013 @ 05:21 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).