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  • Other Sources  (4)
  • 2005-2009  (4)
  • 1
    Publication Date: 2019-07-13
    Type: Planetary Protection Working Group, Ames Research Center; Mar 02, 2006 - Mar 06, 2006; Moffett Field, CA; United States
    Format: text
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  • 2
    Publication Date: 2019-07-13
    Description: In support of the Exploration Vision for returning to the Moon and beyond, NASA and its partners are developing and testing critical cryogenic fluid propellant technologies that will meet the need for high performance propellants on long-term missions. Reliable knowledge of low-gravity cryogenic fluid management behavior is lacking and yet is critical in the areas of tank thermal and pressure control, fluid acquisition, mass gauging, and fluid transfer. Such knowledge can significantly reduce or even eliminate tank fluid boil-off losses for long term missions, reduce propellant launch mass and required on-orbit margins, and simplify vehicle operations. The Propulsion and Cryogenic Advanced Development (PCAD) Project is performing experimental and analytical evaluation of several areas within Cryogenic Fluid Management (CFM) to enable NASA's Exploration Vision. This paper discusses the status of the PCAD CFM technology focus areas relative to the anticipated CFM requirements to enable execution of the Vision for Space Exploration.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA/TM-2007-214810 , AIAA Paper-2007-343 , 45th AIAA Aerospace Sciences Meeting and Exhibit; Jan 08, 2007 - Jan 11, 2007; Reno, NV; United States
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: This slide presentation reviews the planning for the Mars Exploration Program. This includes information on the Mars Science Orbiter, the 2016-2018 planning teams, and updates to the Mars Exploration Analysis Group.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Mars Exploration Program Analysis Group (MEPAG) Meeting No. 16; Jan 09, 2007 - Jan 10, 2007; Arlington, VA; United States
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  • 4
    Publication Date: 2019-07-13
    Description: Relative to ground-based telescopes, the James Webb Space Telescope (JWST) will have a substantial sensitivity advantage in the 2.2-5pm wavelength range where brown dwarfs and hot Jupiters are thought to have significant brightness enhancements. To facilitate high contrast imaging within this band, the Near-Infrared Camera (NIRCAM) will employ a Lyot coronagraph with an array of band-limited image-plane occulting spots. In this paper, we provide the science motivation for high contrast imaging with NIRCAM, comparing its expected performance to that of the Keck, Gemini and 30 m (TMT) telescopes equipped with Adaptive Optics systems of different capabilities. We then describe our design for the NIRCAM coronagraph that enables imaging over the entire sensitivity range of the instrument while providing significant operational flexibility. We describe the various design tradeoffs that were made in consideration of alignment and aberration sensitivities and present contrast performance in the presence of JWST's expected optical aberrations. Finally we show an example of a that can provide 10-5 companion sensitivity at sub-arcsecond separations.
    Keywords: Instrumentation and Photography
    Type: SPIE 50th Annual Meeting and Optics and Photonics Conference; Jul 31, 2005 - Aug 04, 2005; San Diego, CA; United States
    Format: text
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