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Hyperion's sponge-like appearance

Thomas, P. C. and Armstrong, J. W. and Asmar, S. W. and Burns, J. A. and Denk, T. and Giese, B. and Helfenstein, P. and Iess, L. and Johnson, T. V. and McEwen, A. and Nicolaisen, L. and Porco, C. and Rappaport, N. and Richardson, J. and Somenzi, L. and Tortora, P. and Turtle, E. P. and Veverka, J. (2007) Hyperion's sponge-like appearance. Nature, 448 (7149), pp. 50-53. DOI: 10.1038/nature05779.

Full text not available from this repository.

Official URL: http://www.nature.com/nature/journal/v448/n7149/index.html

Abstract

Saturn's Hyperion, the largest known irregularly-shaped satellite and the only moon observed to undergo chaotic rotation1-3, shows a sponge-like appearance at scales of a few km. This unique appearance, distinct from surfaces of other small, airless objects subject to shaping by impact cratering, suggested the possibility of unexpected modification of surface features (D. P. Cruikshank et al. in preparation). Here we analyze images of Hyperion to show that the appearance is the result of a high surface density of relatively well-preserved 2-10 km impact craters, we determine the size and mass of Hyperion, and obtain a mean density indicative of porosity >40%. The high porosity may enhance preservation of craters by minimizing the amount of ejecta produced or retained4,5 and thus be the crucial factor in this unusual landscape.

Document Type:Article
Title:Hyperion's sponge-like appearance
Authors:
AuthorsInstitution or Email of Authors
Thomas, P. C.Cornell University, Ithaca, NY, USA
Armstrong, J. W.JPL, CALTEC, CA, USA
Asmar, S. W.JPL, CALTEC, CA, USA
Burns, J. A.Cornell University, Ithaca, NY, USA
Denk, T.Freie Universität Berlin
Giese, B.UNSPECIFIED
Helfenstein, P.Cornell University, Ithaca, NY, USA
Iess, L.Universita La Sapienza, Roma, Italy
Johnson, T. V.JPL, CALTEC, CA, USA
McEwen, A.University of Arizona, Tucson, AZ, USA
Nicolaisen, L.University of California, Los Angeles, CA, USA
Porco, C.Space Science Institute, Boulder, CA, USA
Rappaport, N.JPL, CALTEC, CA, USA
Richardson, J.Cornell University, Ithaca, NY, USA
Somenzi, L.Universita La Sapienza, Roma, Italy
Tortora, P.Universita di Bologna, Forli, Italy
Turtle, E. P.John Hopkins University, APL, Laurel, MA, USA
Veverka, J.Cornell University, Ithaca, NY, USA
Date:2007
Journal or Publication Title:Nature
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:448
DOI:10.1038/nature05779
Page Range:pp. 50-53
Editors:
EditorsEmail
NPG, UNSPECIFIED
Status:Published
Keywords:Hyperion, Saturnian 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):W - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Dr.rer.nat. Bernd Giese
Deposited On:15 Jan 2008
Last Modified:27 Apr 2009 14:34

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