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Chang’E-4 rover spectra revealing micro-scale surface thermophysical properties of the Moon

Wu, Yunzhao and Kührt, Ekkehard and Grott, Matthias and Jin, Qi and Xu, Tianyi and Helbert, Jörn and Hamm, Maximilian and Qin, Nannan and Ma, Jinsong and Vincent, Jean-Baptiste and Hayne, Paul (2021) Chang’E-4 rover spectra revealing micro-scale surface thermophysical properties of the Moon. Geophysical Research Letters. Wiley. ISSN 0094-8276.

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Abstract

Lunar surface temperature variations provide key information about the thermophysical properties of the regolith. To date, temperatures have been measured using telescopes and orbiter instruments, providing information from mid-to long infrared (IR) wavelengths. Here we report on temperature measurements in the short wavelength IR at centimeter scales observed in situ by the Chang’E-4 rover. These local observations are an important complement to the existing large-scale data. We show that even at 2.4 µm, where reflected radiation dominates the spectrum, thermal information can be retrieved from the data. The observed thermal radiances and derived temperatures depend on the observation geometry, specifically the relative azimuth angle between Sun and detector. This indicates that surface roughness on sub-resolution (millimeter) scales causes a non-Lambertian radiation pattern of the emitted flux that is per definition independent of the observation angle. This behavior must be considered when deriving temperatures and thermal properties of lunar regolith.

Item URL in elib:https://elib.dlr.de/139610/
Document Type:Article
Title:Chang’E-4 rover spectra revealing micro-scale surface thermophysical properties of the Moon
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wu, Yunzhaowu (at) pmo.ac.cnUNSPECIFIED
Kührt, Ekkehardekkehard.kuehrt (at) dlr.dehttps://orcid.org/0000-0002-7845-8797
Grott, Matthiasmatthias.grott (at) dlr.dehttps://orcid.org/0000-0003-0319-2514
Jin, QiSpace Science Institute, Macau University of Science and Technology, Macau, ChinaUNSPECIFIED
Xu, TianyiSpace Science Institute, Macau University of Science and Technology, Macau, ChinaUNSPECIFIED
Helbert, Jörnjoern.helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Hamm, Maximilianmaximilian.hamm (at) dlr.deUNSPECIFIED
Qin, NannanKey Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, ChinaUNSPECIFIED
Ma, Jinsong8School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, ChinaUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.dehttps://orcid.org/0000-0001-6575-3079
Hayne, PaulLaboratory for Atmospheric & Space Physics, and Astrophysical & Planetary Sciences Department, University of Colorado, Boulder, CO, USAUNSPECIFIED
Date:2021
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Wiley
ISSN:0094-8276
Status:Accepted
Keywords:Chang’E-4 mission, lunar surface roughness, rms slope
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System, R - Project ROSETTA Instruments, Project MASCOT Science and operation (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Optical Sensor Systems
Institute of Planetary Research > Planetary Laboratories
Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Physics
Deposited By: Kührt, Dr.rer.nat. Ekkehard
Deposited On:17 Dec 2020 07:35
Last Modified:25 Feb 2021 10:24

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