title: Iapetus: unique surface properties and a global color dichotomy from Cassini imaging.
abstract: 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 approximately 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.
authors.affiliation: Institut für Geologische Wissenschaften, Freie Universität Berlin, 12249 Berlin, Germany. Tilmann.Denk@fu-berlin.de
authors.forename: Tilmann
authors.initials: T
authors.lastname: Denk
authors.forename: Gerhard
authors.initials: G
authors.lastname: Neukum
authors.forename: Thomas
authors.initials: T
authors.lastname: Roatsch
authors.forename: Carolyn C
authors.initials: CC
authors.lastname: Porco
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Burns
authors.forename: Götz G
authors.initials: GG
authors.lastname: Galuba
authors.forename: Nico
authors.initials: N
authors.lastname: Schmedemann
authors.forename: Paul
authors.initials: P
authors.lastname: Helfenstein
authors.forename: Peter C
authors.initials: PC
authors.lastname: Thomas
authors.forename: Roland J
authors.initials: RJ
authors.lastname: Wagner
authors.forename: Robert A
authors.initials: RA
authors.lastname: West
mesh_terms: D003116:Color; D005118:Extraterrestrial Environment; D007053:Ice; D018539:Saturn; D018531:Spacecraft; D013696:Temperature; D014867:Water
chemical_list: D007053:Ice; D014867:Water