* Astronomy

Orbital elements:
2009 SR171                                               Earth MOID = 0.0467 AU
Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M 233.04831              (2000.0)            P               Q
n   0.74722291     Peri.   80.06599     +0.09527636     -0.99518367
a   1.2027331      Node     4.65639     +0.76516735     +0.05839635
e   0.2713793      Incl.   16.50466     +0.63674276     +0.07873587
P   1.32           H   26.0           G   0.15           U   7

MPEC 2009 - S131

The 17 - 37 metre wide asteroid 2009 SR171 will make a close pass (18.9 Lunar Distances, 0.0487 AU), travelling at 10.81 km/s, to the Earth-Moon system on the 3rd October, 2009.

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