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Assessment of InSight Landing Site Predictions
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2020-07-09 , DOI: 10.1029/2020je006502
M. Golombek 1 , D. Kass 1 , N. Williams 1 , N. Warner 2 , I. Daubar 1, 3 , S. Piqueux 1 , C. Charalambous 4 , W. T. Pike 4
Affiliation  

Comprehensive analysis of remote sensing data used to select the Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) landing site correctly predicted the atmospheric temperature and pressure profile during entry and descent, the safe landing surface, and the geologic setting of the site. The smooth plains upon which the InSight landing site is located were accurately predicted to be generally similar to the Mars Exploration Rover Spirit landing site with relatively low rock abundance, low slopes, and a moderately dusty surface with a 3–10 m impact fragmented regolith over Hesperian to Early Amazonian basaltic lava flows. The deceleration profile and surface pressure encountered by the spacecraft during entry, descent, and landing compared well (within 1σ ) of the envelope of modeled temperature profiles and the expected surface pressure. Orbital estimates of thermal inertia are similar to surface radiometer measurements, and materials at the surface are dominated by poorly consolidated sand as expected. Thin coatings of bright atmospheric dust on the surface were as indicated by orbital albedo and dust cover index measurements. Orbital estimates of rock abundance from shadow measurements in high‐resolution images and thermal differencing indicated very low rock abundance and surface counts show 1–4% area covered by rocks. Slopes at 100 to 5 m length scale measured from orbital topographic and radar data correctly indicated a surface comparably smooth and flat as the two smoothest landing sites (Opportunity and Phoenix). Thermal inertia and radar data indicated the surface would be load bearing as found.

中文翻译:

评估InSight着陆点的预测

使用地震勘测,大地测量和热传输(InSight)着陆点对用于选择内部勘探的遥感数据进行全面分析,可以正确预测进入和下降期间的大气温度和压力分布,安全着陆面以及该地点的地质环境。准确地预测,InSight着陆点所在的光滑平原通常与Mars Exploration Rover Spirit着陆点类似,具有相对较低的岩石丰度,低坡度和中等尘土表面,在3-10 m的撞击范围内碎石重生。黑斯佩里亚河到亚马逊河早期玄武岩熔岩流。航天器在进入,下降和着陆期间的减速曲线和表面压力进行了比较(在1σ之内))的温度曲线模型和预期的表面压力。轨道热惯性的估算与表面辐射计的测量类似,并且表面的材料如预期的那样由固结度差的砂所控制。如轨道反照率和尘埃覆盖指数测量所示,表面有明亮的大气尘埃薄涂层。根据高分辨率图像中的阴影测量值和热差计算得出的岩石丰度的轨道估计值表明,岩石丰度非常低,地表数显示有1-4%的岩石被覆盖。根据轨道地形和雷达数据测得的100至5 m长度尺度的坡度正确地表明,作为两个最平稳的着陆点(机会和凤凰号),其表面具有相当的光滑度和平坦度。
更新日期:2020-08-08
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