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  • 1
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    Compass Final Report: Europa Tunnelbot (2019)
    In:  CASI
    Details
    Publication Date: 2019-06-29
    Description: The Compass Final Report: Europa Tunnelbot, is a summary of three Compass concurrent engineering team designs for penetrating the ice of Europa and reaching the ocean, while sampling for biomarkers and communicating back to the surface. These conceptual designs, while providing complete conceptual layouts for these penetrators, or 'Tunnelbots' along with the associated communication 'Repeaters' primarily focused on the power and thermal systems needed for these devices. Trades for these systems will provide advantages and challenges for each option. These results will be used to guide power technology development.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA/TP—2019-220054 , E-19649 , GRC-E-DAA-TN61831
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    NanoSail - D Orbital and Attitude Dynamics (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NanoSail-D unfurled January 20th, 2011 and successfully demonstrated the deployment and deorbit capability of a solar sail in low Earth orbit. The orbit was strongly perturbed by solar radiation pressure, aerodynamic drag, and oblate gravity which were modeled using STK HPOP. A comparison of the ballistic coefficient history to the orbit parameters exhibits a strong relationship between orbital lighting, the decay rate of the mean semi-major axis and mean eccentricity. A similar comparison of mean solar area using the STK HPOP solar radiation pressure model exhibits a strong correlation of solar radiation pressure to mean eccentricity and mean argument of perigee. NanoSail-D was not actively controlled and had no capability on-board for attitude or orbit determination. To estimate attitude dynamics we created a 3-DOF attitude dynamics simulation that incorporated highly realistic estimates of perturbing forces into NanoSail-D torque models. By comparing the results of this simulation to the orbital behavior and ground observations of NanoSail-D, we conclude that there is a coupling between the orbit and attitude dynamics as well as establish approximate limits on the location of the NanoSail-D solar center of pressure. Both of these observations contribute valuable data for future solar sail designs and missions.
    Keywords: Spacecraft Propulsion and Power
    Type: M13-2711 , International Symposium on Solar Sailing; Jun 11, 2013 - Jun 13, 2013; Glasgow; United Kingdom
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Missions to Triton and Pluto using a Hopper Vehicle with In-Situ Refueling (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-14
    Description: The Triton Hopper is a NASA Innovative Advanced Concepts (NIAC) project to design a mission to not merely land, but repeatedly fly across the surface of Triton, utilizing the volatile surface ices (primarily nitrogen) as propellant for a radioisotope-heated thermal rocket engine to launch across the surface and explore all the moon's varied terrain. An engineering design study of the vehicle and mission was done. With a calculated range of 20 km per hop, equator-to-pole mobility can be achieved over a primary mission duration of 2 years. Using Nuclear Electric Propulsion for the transfer vehicle, the same concept can be applied for a mission to the surface of Pluto.
    Keywords: Spacecraft Propulsion and Power
    Type: IAC-19,A3,5,7,x53412 , GRC-E-DAA-TN74147 , International Astronautical Congress (IAC) Conference; Oct 21, 2019 - Oct 25, 2019; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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