Combined albedo spectrum of Phobos in UV and Visible with SPICAM and OMEGA on Mars Express

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Mars Express made several encounters with Phobos for the last 6 years. Observations with SPICAM and OMEGA on board Mars Express cover the range from UV (190-310 nm) to visible and near IR up to 5 μm. In the following we consider only the visible channel of OMEGA and the UV channel of SPICAM. In the UV channel, there is a dip in the geometrical albedo spectrum centered at 220 nm, similar to the one observed in the interstellar extinction, interpreted of PAH origin. The combined UV/VIS SPICAM/OMEGA spectrum exhibits another strong dip centered at 350 nm. It could tentatively be attributed to the presence of ilmenite.

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