Titan's 5-micron lightcurve

Details Titan's 5-micron lightcurve Titan's 5-micron lightcurve

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..168..209l&link_type=abstract

Icarus, Volume 168, Issue 1, p. 209-214.

Other

23

Planets, Titan, Infrared Observations

Scientific paper

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 μm range. These observations, which sample four different positions of Titan around Saturn, clearly indicate a variability of the 5-μm continuum albedo, with Titan's geometric albedo decreasing by ~40% from Titan's leading side to the trailing side. This Titan 5-μm ``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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