* Astronomy

Orbital elements:
2012 RL15                                                Earth MOID = 0.0772 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 242.37280              (2000.0)            P               Q
n   1.20098149     Peri.  334.09550     -0.84526671     -0.53159773
a   0.8765537      Node   173.01482     +0.53398353     -0.84407548
e   0.2938166      Incl.   26.42008     +0.01964125     +0.07028822
P   0.82           H   24.3           G   0.15           U   7

MPEC 2012 - S09

The 36 - 81 metre wide asteroid 2012 RL15 will make a close pass (30.3  lunar distances, 0.0778 AU), travelling at 13.88 km/second, to the Earth-Moon system on the 18th September, 2012 @ 17:14 UT ±00:02. 

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