Near-infrared Photometry of the Moon's Surface with Passive Radiometry from the Lunar Orbiter Laser Altimeter (LOLA)

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-05-27 DOI:10.3847/psj/ad4467
Ryan T. Walker, Michael K. Barker, Erwan Mazarico, Xiaoli Sun, Gregory A. Neumann, David E. Smith, James W. Head and Maria T. Zuber
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Abstract

Examining the reflectance of the Moon's surface across a broad range of viewing geometries through photometric analysis can reveal physical and geological properties of its regolith. Since 2013 December, the Lunar Orbiter Laser Altimeter (LOLA) on board the Lunar Reconnaissance Orbiter (LRO) has been operating as a near-infrared (1064 nm) passive radiometer when its laser is turned off. We present a new analysis of this data set spanning roughly 8 yr and covering the surface up to high latitudes in both hemispheres. We apply semiempirical phase functions to find a lower photometric slope and a narrower opposition effect for the highlands than the maria, consistent with theoretical expectations given the higher albedo of the highlands. Examining various geological properties at global scales shows that, in the highlands, iron abundance (FeO) and optical maturity (OMAT) are the dominant factors affecting the phase function, with a smaller influence from surface slope. In the maria, FeO is the dominant factor, with smaller influences from OMAT, surface slope, and TiO2. Submicroscopic iron abundance (SMFe) has a similar effect to OMAT in both highlands and maria. Analysis at specific sites, including the Reiner Gamma swirl and several silicic anomalies, indicates that the phase functions are consistent with the global data for similar FeO and OMAT. Thermophysical properties inferred from surface temperature observations by the Diviner Lunar Radiometer Experiment on board LRO do not affect the 1064 nm phase function, possibly due to a difference between their depth scale and LOLA's sensing depth.
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利用月球轨道激光高度计(LOLA)的被动辐射测量法对月球表面进行近红外光度测量
通过光度分析,在广泛的观察几何范围内检查月球表面的反射率,可以揭示月球碎屑的物理和地质特性。自2013年12月以来,月球勘测轨道飞行器(LRO)上的月球轨道激光高度计(LOLA)在激光关闭时一直作为近红外(1064 nm)被动辐射计运行。我们对这一数据集进行了新的分析,时间跨度约为 8 年,覆盖地表直至两个半球的高纬度地区。我们运用半经验相位函数,发现高原的光度斜率比海洋低,对立效应比海洋窄,这与理论预期一致,因为高原的反照率更高。对全球尺度上各种地质属性的研究表明,在高地,铁丰度(FeO)和光学成熟度(OMAT)是影响相位函数的主要因素,地表斜率的影响较小。在海洋,FeO 是主要因素,而 OMAT、表面坡度和 TiO2 的影响较小。在高原和海洋,亚微观铁丰度(SMFe)的影响与 OMAT 相似。对特定地点(包括雷纳伽马漩涡和几个硅异常点)的分析表明,相函数与类似氧化铁和 OMAT 的全球数据一致。从 LRO 上的 Diviner 月球辐射计实验的表面温度观测中推断出的热物理特性并不影响 1064 nm 的相位函数,这可能是由于其深度尺度与 LOLA 的感应深度之间存在差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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