Preliminary Characterization of Secondary Illumination at Shackleton Crater Permanently Shadowed Region from ShadowCam Observations and Modeling

IF 0.6 Q4 ASTRONOMY & ASTROPHYSICS Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI:10.5140/jass.2023.40.4.131

P. Mahanti, M. S. Robinson, D. Humm, R. Wagner, Nick Estes, Jean-Pierre Williams

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Abstract

Lunar permanently shadowed regions (PSRs) never see direct sunlight and are illuminated only by secondary illumination - light reflected from nearby topography. The ShadowCam imaging experiment onboard the Korea Pathfinder Lunar Orbiter is acquiring images of these PSRs. We characterize and discuss the nature of secondary illumination for the Shackleton PSR from ShadowCam radiance-calibrated images. We also use modeling to understand the magnitude and direction of the secondary illumination. Results from our analysis highlight the non-homogeneous, dynamic, and complex nature of PSR secondary lighting. Knowledge of the direction of the secondary illumination is crucial for reli-able interpretation of contrasts observed in ShadowCam images. This preliminary analysis of the floor of Shackleton crater from images acquired over multiple secondary illumination conditions does not reveal indications of exposed surface ice, even though temperatures are constantly below 110K.

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通过 ShadowCam 观测和建模初步确定沙克尔顿陨石坑永久阴影区的二次照明特征

月球永久阴影区（PSRs）从来没有阳光直射，只能靠二次照明--附近地形反射的光线--来照明。韩国探路者月球轨道器上的ShadowCam成像实验正在获取这些PSR的图像。我们通过 ShadowCam 辐射校准图像来描述和讨论沙克尔顿 PSR 的二次光照性质。我们还利用建模来了解二次光照的大小和方向。我们的分析结果凸显了 PSR 二次光照的非均质性、动态性和复杂性。了解二次光照的方向对于可靠解释 ShadowCam 图像中观察到的对比度至关重要。根据在多种二次光照条件下获取的图像对沙克尔顿陨石坑底部进行的初步分析，并未发现表面有裸露冰层的迹象，尽管温度一直低于 110K。

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来源期刊

Journal of Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-

CiteScore

1.30

自引率

20.00%

发文量

审稿时长

12 weeks

期刊介绍： JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.