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Catalogue POP – Notice individuelle de publication

Lellouch Emmanuel, Schmitt Bernard, Coustenis Athéna, Cuby Jean-Gabriel

Titan's 5-micron lightcurve

Icarus, 2004, vol. 168, pp. 209-214

Référence DOI : 10.1016/j.icarus.2003.12.001
Référence ADS : 2004Icar..168..209L

Résumé :

We report on repeated mid-resolution ( R˜2000) spectroscopic observations of Titan, acquired between November 2002 and January 2003 with ISAAC at the ESO/VLT and covering the 4.84-5.05 mum range. These observations, which sample four different positions of Titan around Saturn, clearly indicate a variability of the 5-mum continuum albedo, with Titan's geometric albedo decreasing by ˜40% from Titan's leading side to the trailing side. This Titan 5-mum "lightcurve" appears to be in phase with the other near-infrared lightcurves. This can be understood in terms of a surface model in which water ice coexists in minor and variable proportions (13-25%, if pure) with a second, dark, component.

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