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Analysis of the Iridium 33-Cosmos 2251 Collision
T.S. Kelso
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Overview Introduction Anatomy of a Collision Tracking a Collision
Impact on the Space Environment Conclusions
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Introduction What: Collision of Iridium 33 & Cosmos 2251
When: 2009 Feb 1656 UTC Where: N, E, km altitude Northern Siberia Results (as of 2009 Aug 5): 386 pieces of Iridium 33 debris (16 decayed) 927 pieces of Cosmos 2251 debris (30 decayed)
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Anatomy of a Collision
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Relative Velocities
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Kevin Fetter Video: Iridium 33 & 28
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Gabbard Plot: Iridium 33
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Gabbard Plot: Cosmos 2251
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Tracking a Collision
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SOCRATES Min Range
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SOCRATES Rank (All)
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SOCRATES Rank (Top 200)
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Impact on the Space Environment
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Debris Characteristics
Satellite Number of Pieces Total Volume (m3) Dry Mass (kg) Inclination (deg) Iridium 33 386 3.388 556 86 Cosmos 2251 927 7.841 900 74
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Lifetime Analysis: Iridium 33
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Lifetime Analysis: Cosmos 2251
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Lifetime Analysis: Iridium 33
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Lifetime Analysis: Cosmos 2251
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Conclusions Collision has significant long-term adverse effects
International community must continue to work to mitigate debris generation Can mitigate risk by collaboratively sharing SSA SOCRATES-GEO: 11 operators, 150 satellites SOCRATES-LEO: 6 operators, 106 satellites Need best available SSA from SSN Need full examination of this event to help chart the way ahead
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Questions?
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