Wagner, R. and Neukum, G. (1994) Surface units on Callisto: a pre-Galileo view. In: Bulletin of the American Astronomical Society, 3, 1162-. American Institute of Physics, USA. 26th Annual Meeting of the American Stronomical Society, Division for Planetary Sciences (DPS), Washington, DC, Oct. 31 - Nov. 4, 1994.
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The densely cratered surface of Callisto provides a clue to the geological conditions in the early Jovian system. Based on map-projected and contrast enhanced images, photogeologic maps in a scale of 1:10,000,000 from the Valfoedr and Igaluk regions of Callisto have been compild. The latter region will be a primary target of high resolution imaging during the Galileo flybys. At least three units were mapped: heavily cratered material, dark cratered material, and smooth material. Smooth, less densely cratered material indicates locally restricted zones of resurfacing. three types of craters may be distiguished: fresh crater material, degraded crater material and heavily degraded cratered material. Crater size-frequency measurements have been carried out on this units. As craterdensity has not reached a saturation level at least down to a diameter of about 8 km, crater retention ages of all units may be determined. Independence of crater retention ages from the distance to the apex point of orbital motion as well as crater scaling relationships indicate low velocity impacts derived from primarily planetocentric orbits for the major part of the projectiles. Additional analyses of lineament systems show that the Callistoan surface has not undergone any major surface modification since the time of early heavy bombardment.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Surface units on Callisto: a pre-Galileo view|
|Journal or Publication Title:||Bulletin of the American Astronomical Society|
|Publisher:||American Institute of Physics, USA|
|Event Title:||26th Annual Meeting of the American Stronomical Society, Division for Planetary Sciences (DPS), Washington, DC, Oct. 31 - Nov. 4, 1994|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||other|
|HGF - Program Themes:||other|
|DLR - Research area:||UNSPECIFIED|
|DLR - Program:||no assignment|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Planetary Research > Institut für Planetenerkundung|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||02 Apr 2006|
|Last Modified:||27 Apr 2009 09:47|
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