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Surface composition of Hyperion

机译:Hyperion的表面成分

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Hyperion, Saturn's eighth largest icy satellite, is a body of irregular shape in a state of chaotic rotation. The surface is segregated into two distinct units. A spatially dominant high-albedo unit having the strong signature of H_2O ice contrasts with a unit that is about a factor of four lower in albedo and is found mostly in the bottoms of cup-like craters. Here we report observations of Hyperion's surface in the ultraviolet and near-infrared spectral regions with two optical remote sensing instruments on the Cassini spacecraft at closest approach during a fly-by on 25-26 September 2005. The close fly-by afforded us the opportunity to obtain separate reflectance spectra of the high- and low-albedo surface components. The low-albedo material has spectral similarities and compositional signatures that link it with the surface of Phoebe and a hemisphere-wide superficial coating on Iapetus.
机译:土星第八大冰冷卫星Hyperion是处于不规则形状的物体,处于混沌旋转状态。该表面分为两个不同的单元。具有H_2O冰特征的空间优势高反照率单元与反照率低约四分之一的单元形成对比,并且主要在杯状陨石坑的底部发现。在这里,我们报告了在2005年9月25日至26日的一次飞越过程中,卡西尼号航天器上的两个光学遥感仪器以最接近的方法观测到的紫外线和近红外光谱区域中Hyperion的表面。近距离的飞掠为我们提供了机会以获得高和低反照率表面分量的独立反射光谱。这种低反照率的材料具有光谱相似性和成分特征,将其与菲比的表面和伊帕特斯上半球范围的表面涂层联系在一起。

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