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Planetary Science Decadal Survey: IO Observer

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Planetary Science Decadal Survey: IO Observer National Aeronautics and Space Administration Mission Concept Study Planetary Science Decadal Survey Io Observer Science Champion: Elizabeth Turtle ([email protected]) NASA HQ POC: Curt Niebur ([email protected]) May 2010 www.nasa.gov Data Release, Distribution, and Cost Interpretation Statements This document is intended to support the SS2012 Planetary Science Decadal Survey. The data contained in this document may not be modified in any way. Cost estimates described or summarized in this document were generated as part of a preliminary concept study, are model-based, assume a JPL in-house build, and do not constitute a commitment on the part of JPL or Caltech. References to work months, work years, or FTEs generally combine multiple staff grades and experience levels. Cost reserves for development and operations were included as prescribed by the NASA ground rules for the Planetary Science Decadal Survey. Unadjusted estimate totals and cost reserve allocations would be revised as needed in future more-detailed studies as appropriate for the specific cost-risks for a given mission concept. Io Observer i Planetary Science Decadal Survey Mission Concept Study Final Report Study Participants ......................................................................................................... v Acknowledgments........................................................................................................ vi Executive Summary .................................................................................................... vii 1. Scientific Objectives ............................................................................................ 1 Science Questions and Objectives ............................................................................................. 1 Science Traceability ................................................................................................................... 3 2. High-Level Mission Concept ............................................................................... 9 Overview .................................................................................................................................... 9 Concept Maturity Level .............................................................................................................11 Technology Maturity ..................................................................................................................11 Key Trades ...............................................................................................................................11 3. Technical Overview ............................................................................................ 12 Instrument Payload Description ................................................................................................12 Flight System ............................................................................................................................16 Concept of Operations and Mission Design ..............................................................................22 Planetary Protection ..................................................................................................................28 Risk List ....................................................................................................................................29 4. Development Schedule and Schedule Constraints ......................................... 32 High-Level Mission Schedule ....................................................................................................32 Technology Development Plan .................................................................................................33 Development Schedule and Constraints ...................................................................................33 5. Mission Life-Cycle Cost ..................................................................................... 34 Costing Methodology and Basis of Estimate .............................................................................34 Cost Estimates ..........................................................................................................................34 Io Observer ii Figures Figure 1-1. Image of the Jovian Moon Io ...................................................................................................... 1 Figure 2-1. Solar-Powered Spacecraft (Conceptual Design) ...................................................................... 10 Figure 3-1. Earth-Venus-Venus-Earth-Jupiter (6.5-Year) Trajectory .......................................................... 23 Figure 3-2. View from Jupiter North Pole of Arrival and Io Tour in Sun-Rotating Coordinates .................. 24 Figure 3-3. Risk Chart ................................................................................................................................. 29 Figure 4-1.Baseline Mission Schedule ........................................................................................................ 32 Figure C-1. Io Observer Radiation Exposure Estimate ............................................................................... 44 Tables Table 1-1. Prioritized Io Science Objectives from Prior Decadal Survey ...................................................... 2 Table 1-2. Study Instruments and Desired Measurements .......................................................................... 2 Table 1-3. Science Traceability Matrix .......................................................................................................... 4 Table 2-1. Concept Maturity Level Definitions ............................................................................................ 11 Table 3-1. Narrow Angle Camera ............................................................................................................... 13 Table 3-2. Thermal Mapper ......................................................................................................................... 14 Table 3-3. Ion and Neutral Mass Spectrometer .......................................................................................... 14 Table 3-4. Fluxgate Magnetometer (two units, all values PER unit) ........................................................... 15 Table 3-5. Fast Imaging Plasma Spectrometer .......................................................................................... 15 Table 3-6. Payload Mass and Power .......................................................................................................... 16 Table 3-7. Comparison of the Four Options ................................................................................................ 17 Table 3-8. Flight System Mass and Power—Option 1 ................................................................................ 17 Table 3-9. Flight System Mass and Power—Option 2 ................................................................................ 17 Table 3-10. Flight System Mass and Power—Option 3 .............................................................................. 18 Table 3-11. Flight System Mass and Power—Option 4 .............................................................................. 18 Table 3-12. Flight System Element Characteristics .................................................................................... 20 Table 3-13. Four Options and Mission Design Effects ............................................................................... 24 Table 3-14. Key Events Timeline and V Budget ....................................................................................... 24 Table 3-15. Io Flyby Details* ....................................................................................................................... 25 Table 3-16. DSN Tracking Schedule—Options 1, 2, and 4 ........................................................................ 25 Table 3-17. DSN Tracking Schedule—Option 3 ......................................................................................... 26 Table 3-18. Ground Data System Characteristics ...................................................................................... 27 Table 3-19. Mission Design ......................................................................................................................... 28 Table 3-20. Mission Operations and Ground Data Systems ...................................................................... 28 Io Observer iii Table 3-21. Summary of the Moderate Risks ............................................................................................. 30 Table 3-22. Risk Level Definitions .............................................................................................................. 31 Table 4-1. Key Phase Duration ................................................................................................................... 33 Table 5-1. Science Team Workforce for Options 1 and 2 ........................................................................... 35 Table 5-2. Science Team Workforce for Option 3....................................................................................... 35 Table 5-3. Science Team Workforce for Option 4....................................................................................... 35 Table 5-4. Total Mission Cost Funding Profile—Option 1 ........................................................................... 37 Table 5-5. Total Mission Cost
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