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Spectral heterogeneity on Phobos and Deimos: HiRISE observations and comparisons to Mars Pathfinder results

机译：火卫一和地魔的光谱异质性：HiRISE观测和与火星探路者结果的比较

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The High-Resolution Imaging Science Experiment (HiRISE) onboard Mars Reconnaissance Orbiter (MRO) has been used to observe Phobos and Deimos at spatial scales of around 6 and 20 m/px, respectively. HiRISE (McEwen et al., JGR, 112, CitelD E05S02, DOI: 10.1029/2005JE002605, 2007) has provided, for the first time, high-resolution colour images of the surfaces of the Martian moons. When processed, by the production of colour ratio images for example, the data show considerable small-scale heterogeneity, which might be attributable to fresh impacts exposing different materials otherwise largely hidden by a homogenous regolith. The bluer material that is draped over the south-eastern rim of the largest crater on Phobos, Stickney, has been perforated by an impact to reveal redder material and must therefore be relatively thin. A fresh impact with dark crater rays has been identified. Previously identified mass-wasting features in Stickney and Limtoc craters stand out strongly in colour. The interior deposits in Stickney appear more inhomogeneous than previously suspected. Several other local colour variations are also evident. Deimos is more uniform in colour but does show some small-scale inhomogeneity. The bright "streamers" (Thomas et al., Icarus, 123, 536-556,1996) are relatively blue. One crater to the south-west of Voltaire and its surroundings appear quite strongly reddened with respect to the rest of the surface. The reddening of the surroundings may be the result of ejecta from this impact. The spectral gradients at optical wavelengths observed for both Phobos and Deimos are quantitatively in good agreement with those found by unresolved photometric observations made by the Imager for Mars Pathfinder (IMP; Thomas et al., JGR, 104,9055-9068,1999). The spectral gradients of the blue and red units on Phobos bracket the results from IMP.
机译：火星侦察轨道飞行器（MRO）上的高分辨率成像科学实验（HiRISE）已用于分别在约6 m / px和20 m / px的空间尺度上观测火卫一和地魔。 HiRISE（McEwen等人，JGR，112，CitelD E05S02，DOI：10.1029 / 2005JE002605，2007）首次提供了火星卫星表面的高分辨率彩色图像。当进行处理时，例如，通过生成色比图像，数据显示出相当小的小规模异质性，这可能归因于新鲜的撞击，暴露出了不同的材料，否则这些材料在很大程度上被同质的碎石所掩盖。覆盖在火石上最大的火山口东南的边缘上的蓝色物质，斯托尼（Stobney），已被冲孔，露出了较红的物质，因此必须相对较薄。已经确定了黑暗的火山口射线的新鲜冲击。 Stickney和Limtoc陨石坑中先前发现的大量浪费特征在颜色上非常突出。斯蒂克尼（Stickney）的内部沉积物看起来比以前怀疑的更不均匀。其他一些局部颜色变化也很明显。 Deimos的颜色更均匀，但确实表现出一些小范围的不均匀性。明亮的“拖缆”（Thomas等，Icarus，123，536-556，1996）是相对蓝色的。伏尔泰西南部的一个火山口及其周围地区相对于表面的其余部分显得非常红。周围环境变红可能是由于这种撞击而弹出的结果。在火卫一和狄莫斯上观测到的在光波长处的光谱梯度在定量上与由成像仪对火星探路者进行的未解析的光度学观测所发现的那些（IMP； Thomas等人，JGR，104，9055-9068，1999）。火卫一上的蓝色和红色单元的光谱梯度包围了IMP的结果。

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  • 来源
    《Planetary and space science》 |2011年第13期|p.1281-1292|共12页
  • 作者

    N. Thomas; R. Stelter; A. Ivanov; N.T. Bridges; K.E. Herkenhoff; A.S. McEwen;

  • 作者单位

    Physikalisches Institut, Sidlerstr. 5, University of Bern, CH-3012 Bern, Switzerland;

    Physikalisches Institut, Sidlerstr. 5, University of Bern, CH-3012 Bern, Switzerland,University of Colorado, Boulder, CO, USA;

    EPFL, Lausanne, Switzerland;

    Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, MD 20723, USA;

    U.S. Geological Survey, Flagstaff, AZ, USA;

    Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Martian satellites; Phobos; Deimos; Spectrophotometry; Heterogeneity;

    机译：火星卫星;火卫一;Deimos;分光光度法;异质性;

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