Phobos composition: a reappraisal, based on Omega/MEx observations

crossref(2020)

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摘要
<p>The imaging spectrometer OMEGA [1] operates in the VIS-NIR range, covering the (0.35 &#181;m to 5.1 &#181;m) range in 352 contiguous spectral channels.&#160; This spectral range has been chosen as it includes diagnostic signatures of most surface mafic and hydrated minerals, frosts and ices. With a 1.2 mrad IFOV, the footprint varies from 40 m when imaging from 40 kms, up to 4.8 km from an altitude of 4000 km: this allows a global spectral coverage of Phobos to be achieved, at various spatial resolution.</p><p>Along its 16 years of orbital operations, Mars Express has performed tens of close flybys of Phobos, at altitudes down to ~ 50 kms. OMEGA has acquired unprecedented compositional data sets, in both the visible and the near-infrared spectral range. We shall present and discuss these observations, as witnesses of Phobos origin, with their relevance to the upcoming MMX JAXA mission.</p>
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