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John Martin April 5, 2001

SuperNova/ Acceleration Probe (SNAP). Introduction. John Martin April 5, 2001. Summary Observations. Final choice of orbit requires more analysis Each option considered has significant advantages, but also has significant disadvantages

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John Martin April 5, 2001

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  1. SuperNova/ Acceleration Probe (SNAP) Introduction John Martin April 5, 2001

  2. Summary Observations • Final choice of orbit requires more analysis • Each option considered has significant advantages, but also has significant disadvantages • Lunar assist option requires extensive analysis for final choice, but bus design can handle a reasonable class of alternatives • Eclipses are infrequent, but large enough to drive the system design • Overall, the spacecraft appears within current technology • 1 Gigapixel camera sounds impressively large • Jitter requirement requires careful attention SNAP, June 25-28, 2001Goddard Space Flight Center

  3. Headlines • System - Gabe Karpati • Understanding how to build the bus is easier than understanding which orbit to choose • Flight Dynamics - Marco Concha • Ability to lower apogee after lunar assist appears quite reasonable • Mechanical - Dave Peters • Spacecraft bus is a custom but not unusual structure which can be handled by expected launch vehicles • Thermal - Wes Ousley • Spacecraft thermal design driven by the long ecipse time and large propulsion system SNAP, June 25-28, 2001Goddard Space Flight Center

  4. Headlines • Power - Bob Beaman • Power needs during the occasional, long eclipse require a large battery • Attitude Control - Aprille Ericsson • Design is well-understood, but jitter requirement and use of imager output for guidance are of concern • Command & Data Handling - Terry Smith • Image data limited to real-time transmission; other data will be stored during non-contact periods • Flight Software - Ed Greville • Flight software for this mission is not unusual SNAP, June 25-28, 2001Goddard Space Flight Center

  5. Headlines • Data Systems - Ron Vento • Large data volume dictates use of Ka-band and extensive ground station contact time • Mission/Science Operations - Tim Rykowski • Existing Berkeley SSL MOC well-suited to support SNAP • Reliability & Safety - David Bogart • In addition to usual reliability/redundancy items, consider redundant means of opening telescope door and selecting filter wheel position SNAP, June 25-28, 2001Goddard Space Flight Center

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