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The topography of Iapetus' leading side

Giese, B. and Denk, T. and Neukum, G. and Porco, C. C. and Roatsch, T. and Wagner, R. (2005) The topography of Iapetus' leading side. Bulletin of the American Astronomical Society, 37 (3), Abstract#47.08-.

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We have used Cassini-stereo images to derive a topographic model of Iapetus' leading side. The model reveals that Iapetus has substantial topography with heights (referenced to a 747 x 744 x 713 km ellipsoid (Thomas et al., in preparation)) in the range of -9 km to +15 km, much more than observed on the icy satellites of Jupiter. There is an old 800 km impact basin centered at 270 degrees E, 40 degrees N with rim topography of more than 10 km extending over scales of 300-400 km. The fact that this topography did not relax over time may suggest that the lithosphere reached depths larger than the excavation depth at the time of formation, or, if the impact has probed the asthenosphere, that rapid cooling and associated thickening of the lithosphere has prevented relaxation of the rim topography. However, the basin floor is almost level with the surroundings and may indicate that asthenospheric flow was important. In this case the flow could have uplifted the rim. Moreover, the model reveals four impact basins (diameters > 300 km) showing central peak massifs but no rings (including inner rings) are observed. This is consistent with a lithosphere sufficiently thick to prevent ring formation. One of the basins with a weakly pronounced central peak has a slightly updomed floor suggesting isostatic rebound. There is a prominent equatorial ridge with heights of more than 12 km and widths < 100 km. The morphology of the ridge suggests a tectonic origin involving upwarping of the surface.

Item URL in elib:https://elib.dlr.de/18803/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:The topography of Iapetus' leading side
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Denk, T.Freie Universität BerlinUNSPECIFIEDUNSPECIFIED
Neukum, G.Freie Universität BerlinUNSPECIFIEDUNSPECIFIED
Porco, C. C.Space Science Institute, Boulder, CO, USAUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Bulletin of the American Astronomical Society
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:Abstract#47.08-
Keywords:Cassini, Iapetus, Icy satellites
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:09 Oct 2005
Last Modified:14 Jan 2010 19:46

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