here there be dragons: navigating saturn’s treacherous ... · here there be dragons: navigating...
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Here There Be Dragons: Navigating Saturn’s Treacherous Dust Hazards
David Seal Cassini Mission Planner Jet Propulsion Laboratory
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Why Do You Wear Your Seat Belt?
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Risk Management
Likelihood: low Impact: very high Mitigation: wear seat belt, buy car withairbags, drive defensively, don’t text/drink and drive, avoid bad weather, etc. Other low-Ps: losing keys; theft; struck bymeteorite; nuclear war
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Planetary Rings
All of the outer planets have ring systems Until Cassini, missions to the outer planetselected to avoid them altogether (or sothey thought) Cassini managed hazards extensively Juno, New Horizons are upcoming
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Outer Planet Ring Systems
Keck
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Outer Planet Ring Systems
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Historical Encounters
Jupiter Pioneer 10, 11, Voyager 1, 2, Ulysses, Galileo, Cassini, New Horizons
Saturn Pioneer 11, Voyager 1, 2, Cassini
Uranus, Neptune Voyager 2
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Saturn’s Rings
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Saturn’s Rings
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Saturn’s Rings
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Saturn’s Rings
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Saturn’s Rings
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Saturn’s Rings
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Saturn’s Rings
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Classic Real-World Conundrum We don’t fully understand the environment We go to Saturn to study / learn about the environment We need to watch out for hazards in Saturn’s environmental We need to understand the environment to make decisions about those hazards See #1
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Cassini Approach
Ring hazard workshop - Ames, 1995 Vulnerability assessment, hazard modeling 1990-present Risk mitigation
Trajectory (re)design Attitude enforcement Protective cover (for main engines)
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Hypervelocity Impacts
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Cassini Saturn Orbit Insertion
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Enceladus’ Plumes
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Protective Measures
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Protective Measures
Main engine cover“
Dual drive actuator
Stowed cover
baby buggy”
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Protective Measures
Main engine cover
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Proximal Orbits
Orbits 1-5
Orbits 6-7
Orbits 8-12
Orbits 13-17
Orbits 18-22
EOM orbit
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Saturn’s D Ring
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“The whole point of leaving home is to go somewhere, not to endlessly circle the block”
- Wes Huntress, former NASA Associate Administrator for Space Science