Thermal properties of Rhea's poles: Evidence for a meter-deep unconsolidated subsurface layer
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- 作者：C.J.A. Howetta ; howett@boulder.swri.edu" class="auth_mail" title="E-mail the corresponding author ; J.R. Spencera ; T. Hurfordb ; A. Verbiscerc ; M. Segurab
- 关键词：Satellites ; surfaces ; Satellites ; composition ; Saturn ; satellites ; Infrared observations
- 刊名：Icarus
- 出版年：2016
- 出版时间：1 July 2016
- 年：2016
- 卷：272
- 期：Complete
- 页码：140-148
- 全文大小：2892 K
文摘
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North and south polar surface temperatures on Rhea have been derived from new Cassini/CIRS observations.
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Observed polar temperatures require a bolometric albedo of 0.70-0.74, and thermal inertias of 1-46 MKS, to fit the data.
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The derived thermal inertias are low, implying Rhea’s surface must be porous even at the 10s of cm depths probed by the seasonal wave.
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The (first-ever) emissivity spectrum produced for Rhea is flat (within error), perhaps partly due to a highly porous surface.