* Astronomy

Orbital elements:
2009 SN1                                                 Earth MOID = 0.0231 AU
Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M 321.29448              (2000.0)            P               Q
n   0.29353507     Peri.   45.59990     +0.73014434     -0.68328471
a   2.2423120      Node   357.49389     +0.60309768     +0.64674920
e   0.5711845      Incl.    4.39784     +0.32118908     +0.33887679
P   3.36           H   25.4           G   0.15           U   9

MPEC 2009 - S43

The 22 - 49 metre wide asteroid 2009 SN1 will make a close pass (15.1 Lunar Distances, 0.0387 AU), travelling at 10.29 km/s, to the Earth-Moon system on the 30th September, 2009.

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

2009 SN1 Earth Impact Risk Summary
Torino Scale (maximum) 0 Palermo Scale (maximum) -8.42 Palermo Scale (cumulative) -8.03 Impact Probability (cumulative) 8.4e-09 Number of Potential Impacts 6	Vimpact 17.94 km/s Vinfinity 14.03 km/s H 25.3 Diameter 0.029 km Mass 3.4e+07 kg Energy 1.3e+00 MT all above are mean values weighted by impact probability
Analysis based on 11 observations spanning .16279 days (2009-Sep-18.33912 to 2009-Sep-18.501911)