https://ntrs.nasa.gov/search.jsp?R=20180001294 2019-08-30T12:28:14+00:00Z NASA/TM—2018-219423 Triton Hopper: Exploring Neptune’s Captured Kuiper Belt Object Steve Oleson and Geoffrey Landis Glenn Research Center, Cleveland, Ohio January 2018 NASA STI Program . in Profile Since its founding, NASA has been dedicated • CONTRACTOR REPORT. Scientific and to the advancement of aeronautics and space science. technical findings by NASA-sponsored The NASA Scientific and Technical Information (STI) contractors and grantees. Program plays a key part in helping NASA maintain this important role. • CONFERENCE PUBLICATION. Collected papers from scientific and technical conferences, symposia, seminars, or other The NASA STI Program operates under the auspices meetings sponsored or co-sponsored by NASA. of the Agency Chief Information Officer. It collects, organizes, provides for archiving, and disseminates • SPECIAL PUBLICATION. Scientific, NASA’s STI. 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Hampton, VA 23681-2199 NASA/TM—2018-219423 Triton Hopper: Exploring Neptune’s Captured Kuiper Belt Object Steve Oleson and Geoffrey Landis Glenn Research Center, Cleveland, Ohio National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio 44135 January 2018 Acknowledgments The authors wish to thank the NASA Advanced Innovative Concepts program for support and guidance during the Triton Hopper study. We also wish to recognize the COMPASS team for their innovations and completeness in performing this study. This report contains preliminary findings, subject to revision as analysis proceeds. Trade names and trademarks are used in this report for identification only. Their usage does not constitute an official endorsement, either expressed or implied, by the National Aeronautics and Space Administration. Level of Review: This material has been technically reviewed by technical management. Available from NASA STI Program National Technical Information Service Mail Stop 148 5285 Port Royal Road NASA Langley Research Center Springfield, VA 22161 Hampton, VA 23681-2199 703-605-6000 This report is available in electronic form at http://www.sti.nasa.gov/ and http://ntrs.nasa.gov/ Contents 1.0 Executive Summary .............................................................................................................................. 1 1.1 Science .......................................................................................................................................... 5 2.0 Study Background, Assumptions and Approach .................................................................................. 7 2.1 Introduction .................................................................................................................................. 7 2.2 Previous Studies ........................................................................................................................... 7 2.3 Triton Overview ........................................................................................................................... 8 2.4 Triton Operational Environment ................................................................................................... 8 2.5 Hopper Science ........................................................................................................................... 10 2.6 Study Purpose and Approach...................................................................................................... 11 2.7 Growth, Contingency, and Margin Policy .................................................................................. 11 2.7.1 Mass Growth ................................................................................................................... 14 2.7.2 Power Growth ................................................................................................................. 15 2.7.3 Redundancy Assumptions ............................................................................................... 15 2.8 Design Trades ............................................................................................................................. 15 3.0 Baseline Design .................................................................................................................................. 17 3.1 Concept of Operations (CONOPS) ............................................................................................. 17 3.2 Mission ....................................................................................................................................... 19 3.2.1 LV Ascent, Park Orbit and TTI ....................................................................................... 19 3.2.2 Earth to Triton Cruise ...................................................................................................... 19 3.2.3 Triton Entry, Descend, Landing and Operation .............................................................. 20 3.2.4 Operation of Triton Hopper............................................................................................. 21 3.3 System Level Summary .............................................................................................................. 24 3.4 Triton Entry System/Cruise Stage .............................................................................................. 24 3.5 Triton Concept Drawings and Descriptions ............................................................................... 26 4.0 Subsystem Breakdown ........................................................................................................................ 33 4.1 Science Payload and ISRU System ............................................................................................ 33 4.1.1 Science Requirements ..................................................................................................... 33 4.1.2 Science Instruments ........................................................................................................ 33 4.1.3 ISRU: Propellant Gathering Systems .............................................................................. 35 4.1.4 Science Payload and ISRU System MEL........................................................................ 37 4.2 Communications and Tracking ................................................................................................... 37 4.2.1 Communications Requirements ...................................................................................... 37 4.2.2 Communications Assumptions ........................................................................................ 38 4.2.3 Communications Design and MEL ................................................................................. 39 4.2.4 Communications System and Risk Analysis ................................................................... 41 4.3 Command and Data Handling (C&DH) System......................................................................... 41 4.3.1 C&DH Requirements ...................................................................................................... 41 4.3.2 C&DH Assumptions ....................................................................................................... 42 4.3.3 C&DH Design and MEL and Risks ................................................................................ 42 4.3.4 C&DH System Risk ........................................................................................................ 43 4.4 Guidance, Navigation, and Control (GN&C) ............................................................................. 43 4.4.1 GN&C Requirements ...................................................................................................... 43 4.4.2 GN&C Assumptions ......................................................................................................