* Astronomy

Orbital elements:
2011 SM173                                               Earth MOID = 0.0019 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5                 MPC
M 343.00074              (2000.0)            P               Q
n   0.25115739     Peri.  233.67960     +0.59898534     -0.80075998
a   2.4879334      Node   179.52308     +0.73938802     +0.55301817
e   0.6460593      Incl.    0.85601     +0.30744419     +0.23011811
P   3.92           H   27.7           G   0.15           U   6

MPEC 2011 - S97

The 7 - 17 metre wide asteroid 2011 SM173 will make a close pass (0.8 lunar distances, 0.0019 AU), travelling at 12.71 km/second, to the Earth-Moon system on the 30th September, 2011 @ 17:01 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).