* Astronomy

Orbital elements:
2011 SL173                                               Earth MOID = 0.0536 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5                 MPC
M 289.34812              (2000.0)            P               Q
n   0.78663965     Peri.  237.99676     +0.43492550     -0.89900621
a   1.1622124      Node   186.84615     +0.90043861     +0.43375923
e   0.1447254      Incl.   25.46916     -0.00707944     -0.06033883
P   1.25           H   25.5           G   0.15           U   8

MPEC 2011 - S96

The 21 - 47 metre wide asteroid 2011 SL173 will make a close pass (22.6 lunar distances, 0.0581 AU), travelling at 13.66 km/second, to the Earth-Moon system on the 1st October, 2011 @ 10:44 UT ±00:01.
Return on the 15th March, 2012.

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