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