10The surface of Ariel, an icy satellite orbiting Uranus, shows extensional tectonic features 11suggesting an episode of endogenic heating in the satellite's past. Using topography derived from 12 stereo-photoclinometry, we identified flexural uplift at a rift zone suggesting elastic thickness 13 values in the range 3.8-4.4 km. We estimate the temperature at the base of the lithosphere to be 14 in the range 99 to 146 K, depending on the strain rate assumed, with corresponding heat fluxes 15
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