Far‐Ultraviolet Photometric Response of Apollo Soil 10084

1U. Raut,1P. L. Karnes,1,2K. D. Retherford,1M. W. Davis,3Y. Liu,1,2G. R. Gladstone,1E. L. Patrick,1Thomas K. Greathouse,4A. R. Hendrix,1P. Mokashi
Journal of Geophysical Research, Planets (In Press) Link to Article [https://doi.org/10.1029/2018JE005567]
1Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, USA
2Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, TX, USA
3Lunar and Planetary Institute, Houston, TX, USA
4Planetary Science Institute, Tucson, AZ, USA
Published by arrangement with John Wiley & Sons

We report new measurements of the far‐ultraviolet (FUV) bidirectional reflectance of Apollo soil 10084 from the Southwest Research Institute ultraviolet reflectance chamber. The bidirectional reflectance distribution function of this mare soil, enriched in Ti and Fe content, is rather featureless in the FUV wavelength region of 115–180 nm, except for a small blue slope, which is attributed to the effects of space weathering. This soil preferentially backscatters FUV photons as indicated by the angular distribution of the bidirectional reflectance. The phase curves are fitted with a simplified Hapke photometric model to derive the average volume single scattering albedo and scattering phase function of the mare lunar grains. The albedo values and the backscattering nature reported here are consistent with Lunar Reconnaissance Orbiter’s Lyman‐Alpha Mapping Project ultraviolet imaging spectrograph observations, despite expected morphological differences.

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