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Xenia Mission: Spacecraft Design Concept NASA/TM—2009–216270 Xenia Mission: Spacecraft Design Concept R. C. Hopkins, C.L. Johnson, C. Kouveliotou, and D. Jones Marshall Space Flight Center, Huntsville, Alabama M. Baysinger, T. Bedsole, and C.D. Maples Qualis Corporation, Huntsville, Alabama P.J. Benfield and M. Turner The University of Alabama in Huntsville, Huntsville, Alabama P. Capizzo Raytheon, Huntsville, Alabama L. Fabisinski ISSI, Huntsville, Alabama L. Hornsby and K. Thompson Jacobs Engineering, Huntsville, Alabama J.H. Miernik ERC, Inc., Huntsville, Alabama T. Percy Science Applications International Corporation, Huntsville, Alabama December 2009 The NASA STI Program...in Profile Since its founding, NASA has been dedicated to the • CONFERENCE PUBLICATION. Collected advancement of aeronautics and space science. The papers from scientific and technical conferences, NASA Scientific and Technical Information (STI) symposia, seminars, or other meetings sponsored Program Office plays a key part in helping NASA or cosponsored by NASA. maintain this important role. • SPECIAL PUBLICATION. Scientific, technical, The NASA STI Program Office is operated by or historical information from NASA programs, Langley Research Center, the lead center for projects, and mission, often concerned with NASA’s scientific and technical information. The subjects having substantial public interest. NASA STI Program Office provides access to the NASA STI Database, the largest collection of • TECHNICAL TRANSLATION. aeronautical and space science STI in the world. English-language translations of foreign The Program Office is also NASA’s institutional scientific and technical material pertinent to mechanism for disseminating the results of its NASA’s mission. research and development activities. These results are published by NASA in the NASA STI Report Specialized services that complement the STI Series, which includes the following report types: Program Office’s diverse offerings include creating custom thesauri, building customized databases, TECHNICAL PUBLICATION. Reports of organizing and publishing research results ... even completed research or a major significant providing videos. phase of research that present the results of NASA programs and include extensive data For more information about the NASA STI Program or theoretical analysis. Includes compilations Office, see the following: of significant scientific and technical data and information deemed to be of continuing • Access the NASA STI program home page at reference value. NASA’s counterpart of peer- <http://www.sti.nasa.gov> reviewed formal professional papers but has less stringent limitations on manuscript length and • E-mail your question via the Internet to extent of graphic presentations. <help @ sti.nasa.gov> • TECHNICAL MEMORANDUM. Scientific • Fax your question to the NASA STI Help Desk and technical findings that are preliminary or of at 443 –757–5803 specialized interest, e.g., quick release reports, working papers, and bibliographies that contain • Phone the NASA STI Help Desk at minimal annotation. Does not contain extensive 443 –757–5802 analysis. • Write to: • CONTRACTOR REPORT. Scientific and NASA STI Help Desk technical findings by NASA-sponsored NASA Center for AeroSpace Information contractors and grantees. 7115 Standard Drive Hanover, MD 21076–1320 NASA/TM—2009–216270 Xenia Mission: Spacecraft Design Concept R. C. Hopkins, C.L. Johnson, C. Kouveliotou, and D. Jones Marshall Space Flight Center, Huntsville, Alabama M. Baysinger, T. Bedsole, and C.D. Maples Qualis Corporation, Huntsville, Alabama P.J. Benfield and M. Turner The University of Alabama in Huntsville, Huntsville, Alabama P. Capizzo Raytheon, Huntsville, Alabama L. Fabisinski ISSI, Huntsville, Alabama L. Hornsby and K. Thompson Jacobs Engineering, Huntsville, Alabama J.H. Miernik ERC, Inc., Huntsville, Alabama T. Percy Science Applications International Corporation, Huntsville, Alabama National Aeronautics and Space Administration Marshall Space Flight Center • MSFC, Alabama 35812 December 2009 Available from: NASA Center for AeroSpace Information 7115 Standard Drive Hanover, MD 21076 –1320 443 –757– 5802 This report is also available in electronic form at <https://www2. sti.nasa.gov> TABLE OF CONTENTS 1. INTroDuCTIoN ............................................................................................................. 1 2. SCIENCE MISSIoN SuMMArY .................................................................................... 3 2.1 Warm-Hot Intergalactic Medium ................................................................................. 3 2.2 Galaxy Clusters ............................................................................................................ 3 2.3 Gamma-ray Bursts ...................................................................................................... 3 3. MISSIoN ANAlYSIS ........................................................................................................ 5 3.1 Mission requirements and Approach ........................................................................... 5 3.2 launch Vehicle Performance ........................................................................................ 6 3.3 orbital lifetime ............................................................................................................ 6 3.4 End-of-life Disposal and Debris Assessment ............................................................... 7 4. CoNFIGurATIoN .......................................................................................................... 11 5. MASS ProPErTIES ......................................................................................................... 14 5.1 Methodology ................................................................................................................ 14 5.2 results .......................................................................................................................... 14 6. GuIDANCE, NAVIGATIoN, AND CoNTrol .............................................................. 16 6.1 Guidance, Navigation, and Control results and Conclusions ....................................... 23 7. AVIoNICS .......................................................................................................................... 24 7.1 Methodology and Approach ......................................................................................... 24 7.2 Avionics results and Conclusions ................................................................................. 28 8. PoWEr .............................................................................................................................. 29 8.1 Ground rules and Assumptions ................................................................................... 29 8.2 Design Highlights ......................................................................................................... 30 9. THErMAl ........................................................................................................................ 32 TABLE OF CONTENTS (Continued) 10. ProPulSIoN ................................................................................................................. 35 10.1 Assumptions ............................................................................................................. 35 10.2 Solid Versus liquid Trade Study ............................................................................... 35 10.3 liquid Engine Trade Study ....................................................................................... 36 10.4 Propulsion Conclusion .............................................................................................. 37 11. STruCTurES ................................................................................................................. 39 12. CoNCluSIoN ................................................................................................................ 41 rEFErENCES ....................................................................................................................... 43 iv LIST OF FIGURES 1. Plot of orbital altitude versus time ............................................................................. 8 2. required deorbit ∆ V for various circular orbit altitudes and desired reentryflight path angles ............................................................................................ 9 3. Estimated gravity losses as a function of the T/W ratio .............................................. 9 4. Xenia spacecraft configuration ................................................................................... 12 5. Array .......................................................................................................................... 13 6. Shroud stowage concept ............................................................................................. 13 7. Ball Aerospace M95 CMG four-wheel pyramid set .................................................... 16 8. ACS tool inputs .......................................................................................................... 18 9. Number of slews possible per desaturation cycle ........................................................ 21 10. CMG versus reaction wheel performance trade: science time versus slew time (all pyramid configurations) ........................................................................ 22 11. Data rate versus burst time ........................................................................................
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