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Far-Ultraviolet Reflectance Measurements of Apollo Soils and Lunar Simulants

Presentation #207.09 in the session Moon & Earth II (Oral Presentation)

Published onOct 23, 2023
Far-Ultraviolet Reflectance Measurements of Apollo Soils and Lunar Simulants

We have characterized the far-ultraviolet (FUV) spectro-photometric response of lunar soil simulants JSC-1A and LMS-1, reporting notable differences from our previous results for Apollo soil 10084 (Raut et al., 2018). While JSC-1A and LMS-1 were designed to emulate the geotechnical and compositional properties of a low-Ti and high-Ti mare soil respectively, these terrestrial simulants lack “space weathering” attributes such as the nanophase iron present in the weathered rims of Apollo grains and glassy agglutinates. Our analyses imply that low-Ti content, corroborated using energy dispersive x-ray spectroscopy, correlates to brighter FUV reflectance and a greater spectral blue slope for JSC-1A, while space weathering components likely contribute to the backscattering of FUV light by the Apollo soil relative to both simulants. To further deconvolute the relative contributions of weathering and composition to the FUV spectral response of Apollo soils, we are currently conducting measurements of two lunar highland samples, Apollo soils 68501 and 71061. The generally low-Ti highland samples contrast to the high-Ti Apollo soil 10084 and LMS-1 samples, while the comparison of the high-maturity Apollo soil 68501 to the low-maturity Apollo soil 71061 will allow a more comprehensive examination of how space weathering effects alter the FUV reflectance.

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