Iapetus: Unique Surface Properties and a Global Color Dichotomy from Cassini Imaging

Details Iapetus: Unique Surface Properties and a Global Color Dichotomy from Cassini Imaging Iapetus: Unique Surface Properties and a Global Color Dichotomy from Cassini Imaging

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sci...327..435d&link_type=abstract

Science, Volume 327, Issue 5964, pp. 435- (2010).

Physics

10

Scientific paper

Since 2004, Saturn’s moon Iapetus has been observed repeatedly with the Imaging Science Subsystem of the Cassini spacecraft. The images show numerous impact craters down to the resolution limit of ~10 meters per pixel. Small, bright craters within the dark hemisphere indicate a dark blanket thickness on the order of meters or less. Dark, equator-facing and bright, poleward-facing crater walls suggest temperature-driven water-ice sublimation as the process responsible for local albedo patterns. Imaging data also reveal a global color dichotomy, wherein both dark and bright materials on the leading side have a substantially redder color than the respective trailing-side materials. This global pattern indicates an exogenic origin for the redder leading-side parts and suggests that the global color dichotomy initiated the thermal formation of the global albedo dichotomy.

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