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Post Info TOPIC: Asteroid 2009 ST171


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Asteroid 2009 ST171
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Orbital elements:
2009 ST171 Earth MOID = 0.0274 AU
Epoch 2009 June 18.0 TT = JDT 2455000.5 MPC
M 330.28088 (2000.0) P Q
n 0.23723185 Peri. 205.88087 +0.84355286 -0.53699358
a 2.5843662 Node 186.61334 +0.50336555 +0.79544948
e 0.6081273 Incl. 3.74097 +0.18719426 +0.28088792
P 4.15 H 26.8 G 0.15 U 7

MPEC 2009 - S133


2009 ST171
Earth Impact Risk Summary
Torino Scale (maximum) 0
Palermo Scale (maximum) -6.62
Palermo Scale (cumulative) -6.62
Impact Probability (cumulative) 2.3e-06
Number of Potential Impacts 1
Vimpact 14.86 km/s
Vinfinity 9.83 km/s
H 26.8
Diameter 0.015 km
Mass 4.3e+06 kg
Energy 1.1e-01 MT
all above are mean values
weighted by impact probability
Analysis based on
19 observations spanning 1.1579 days
(2009-Sep-28.23931 to 2009-Sep-29.39719)


The 12 - 26 metre wide asteroid 2009 ST171 will make a close pass (15.8 Lunar Distances, 0.0407 AU), travelling at 8.71 km/s, to the Earth-Moon system on the 5th 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).


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