Bidirectional reflectance distribution function measurements of the Winchcombe meteorite using the Visible Oxford Space Environment Goniometer

Bidirectional reflectance distribution function measurements of the Winchcombe meteorite using the Visible Oxford Space Environment Goniometer
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使用可见牛津空间环境测角仪测量温奇科姆陨石的双向反射率分布函数

DOI:
10.1111/maps.14055
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发表时间:
2023
影响因子:
2.2
通讯作者:
Curtis R
Curtis R
中科院分区:
地球科学3区
文献类型:
--
作者:
Curtis R

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使用可见牛津空间环境测角仪进行了实验室研究,其中测量了温奇康贝陨石的宽带(350-1250 nm)双向反射分布函数(BRDF),视角范围为反射率:0°-70°,步长为5°;入射角:15°,30°,45°和60°;方位角:0°,90°和180°。使用Hapke BRDF模型拟合BRDF数据集,以(1)提供与其他陨石和小行星进行比较的方法,以及(2)产生可用于将BRDF外推到所有角度的Hapke参数值。计算出温奇康贝的Hapke参数:w= 0.152 ± 0.030,b = 0.633 ± 0.064,hS = 0.016 ± 0.008,与塔吉什湖的w值(0.157 ± 0.020)和奥盖尔湖的b值(0.671 ± 0.090)相近。重要的是,使用Alicona 3D®仪器表征样品的表面轮廓,允许Hapke模型中的两个自由参数φ和φ分别代表孔隙率和表面粗糙度,被约束为φ= 0.649 ± 0.023和φ = 16.113°(在500 μm尺寸尺度下)。这项工作是温奇康贝的表征过程的一部分,并为当前和未来的小行星飞行任务提供了参考测光数据集。
A laboratory study was performed using the Visible Oxford Space Environment Goniometer in which the broadband (350–1250 nm) bidirectional reflectance distribution function (BRDF) of the Winchcombe meteorite was measured, across a range of viewing angles—reflectance: 0°–70°, in steps of 5°; incidence: 15°, 30°, 45°, and 60°; and azimuthal: 0°, 90°, and 180°. The BRDF dataset was fitted using the Hapke BRDF model to (1) provide a method of comparison to other meteorites and asteroids, and (2) to produce Hapke parameter values that can be used to extrapolate the BRDF to all angles. The study deduced the following Hapke parameters for Winchcombe:w= 0.152 ± 0.030,b= 0.633 ± 0.064, andhS= 0.016 ± 0.008, demonstrating that it has a similarwvalue to Tagish Lake (0.157 ± 0.020) and a similarbvalue to Orgueil (0.671 ± 0.090). Importantly, the surface profile of the sample was characterized using an Alicona 3D® instrument, allowing two of the free parameters within the Hapke modelφand, which represent porosity and surface roughness, respectively, to be constrained asφ= 0.649 ± 0.023 and= 16.113° (at 500 μm size scale). This work serves as part of the characterization process for Winchcombe and provides a reference photometry dataset for current and future asteroid missions.
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