Passive thermal control of a spacecraft is reliant on external surface optical properties (solar absorptivity and IR emissivity), which degrade over time depending on length of mission, material or coating, and natural and induced environments. Understanding the degradation and resulting End of Life (EOL) optical properties enables optimization of the thermal performance and reduces risk. The environmental factors that affect degradation of materials and coatings include UV, solar wind, vacuum, contamination, lunar dust, atomic oxygen, and more. Future spacecraft such as Gateway will be flying in the Near Rectilinear Halo Orbit (NRHO), an environment that has not been flown before and environmental factors are different from Low Earth Orbit. There is no on orbit data for materials in this environment, and optical property data from on-orbit and ground experiments for other environments is of limited use. This 1.5 hour short course will explore optical properties and degradation by introducing the expected environment of NRHO, types of materials and coatings that could be used, how to estimate their EOL properties, and future work. This course will focus on the NRHO environment, but it will be beneficial for anyone interested in optical property degradation in the space environment.


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    Title :

    Thermal Materials and Coatings for Near Rectilinear Halo Orbit (NRHO)


    Contributors:

    Conference:

    NASA Engineering and Safety Center (NESC) Thermal & Fluids Analysis Workshop 2020 ; 2020 ; Virtual, US


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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