Populations of small craters in Europa, Ganymede, and Callisto - Initial Galileo imaging results

Details Populations of small craters in Europa, Ganymede, and Callisto - Initial Galileo imaging results Populations of small craters in Europa, Ganymede, and Callisto - Initial Galileo imaging results

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..217c&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 217.

Physics

4

Europa, Ganymede, Callisto, Satellite Surfaces, Planetary Craters, Satellite Imagery, Galileo Spacecraft, Diameters, Spatial Distribution, Density Distribution

Scientific paper

We present preliminary crater counts for various terrains on Ganymede (including Uruk Sulcus, Galileo Regio, and the 'unnamed sulcus'), Europa, and the Valhalla region of Callisto. A single generalization is that craters less than several hundred m diameter are unexpectedly underabundant, never approaching saturation densities even on the terrains of Ganymede and Callisto that appear saturated by large craters. The processes that have degraded and/or erased small craters vary rather remarkably from satellite to satellite and on the different terrains of each. We present evidence that many 6-15-km diameter pits on Europa may not be impact craters (instead they may be collapse features, for example). Differential diameter-frequency relations are presented in the 'Relative Plot' format, where height on the plot indicates spatial density of craters, and unity is geometric saturation.

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