In Situ Photometric Experiment of Lunar Regolith With Visible and Near‐Infrared Imaging Spectrometer On Board the Yutu‐2 Lunar Rover

1Honglei Lin,2Rui Xu,1Wei Yang,1Yangting Lin,1Yong Wei,1Sen Hu,2Zhiping He,3Le Qiao,1Weixing Wan
Journal of Geophysical Research, Planets (in Press) Link to Article [https://doi.org/10.1029/2019JE006076]
1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
2Key Laboratory of Space Active Opto‐Electronics Technology, Shanghai
Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, China
3Shandong Provincial Key Laboratory of Optical Astronomy and Solar‐Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China
Published by arrangement with John Wiley & Sons

China’s Chang’E‐4 (CE‐4) mission successfully landed in Von Kármán crater within South Pole‐Aitken basin of the Moon. The Visible and Near‐Infrared Imaging Spectrometer (VNIS) on board Yutu‐2 rover investigated the photometric properties of lunar regolith. Seven VNIS measurements were conducted on a small lunar surface with a diameter <5 m by the rover rotating at the center, with the phase angles from 39.6 to 97.1° obtained in the similar observational geometry of solar altitude and observation angle. The phase function, which varies in different wavelength, is derived using a third‐order polynomial fitting, in combination with the calibration and comparison of orbital/in situ VNIS data at the Chang’E‐4 landing site and the same regions. After the photometrical correction of the spectra with the phase function, the derived FeO contents and optical maturity parameters of the regolith reduce much of their deviations, which is consistent with the homogeneity of the regolith and hence demonstrates the significance of the photometric correction on the VNIS spectra.

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