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  • 1
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    In:  Other Sources
    Publication Date: 2019-07-13
    Description: Communication links between two orbiters are analyzed by projecting occultation regions onto the orbit planes. The occultation regions are conic sections, and can be defined in the same functional form as orbits. Cases of a full and partial ellipse, full, partial, and degenerate hyperbola, and parabola are considered. It is noted that because overall communication link availability may depend on earth-to-orbiter and surface-to-orbiter links, the analysis must consider the simultaneous performance of all links. The approach presented in this study gives insight into the orbiter-to-orbiter geometry and the overall communication link availability.
    Keywords: ASTRODYNAMICS
    Type: AAS PAPER 89-200 , AAS/NASA Intl. Symposium on Orbital Mechanics and Mission Design; Apr 24, 1989 - Apr 27, 1989; Greenbelt, MD; United States
    Format: text
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  • 2
    Publication Date: 2019-07-13
    Description: The paper presents the results of the first stage of a Mercury Orbiter Mission Concept Definition study originated by NASA, with emphasis on a proposed end-to-end mission scenario. The science rationale and the strawman payload are presented, along with the spacecraft design based on a novel use of conventional technology that eliminates the need for high-cost high-risk technology development. A mission scenario demonstrating the capability of conducting desired science investigations is addressed. It is shown that complete imaging coverage of the planet at 1-km or better resolution, and with at least three different phase angles, is possible. Focus is placed on launch period analysis, mission performance, and mission opportunities.
    Keywords: ASTRODYNAMICS
    Type: AAS PAPER 89-195 , AAS/NASA Intl. Symposium on Orbital Mechanics and Mission Design; Apr 24, 1989 - Apr 27, 1989; Greenbelt, MD; United States
    Format: text
    Location Call Number Expected Availability
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