Smith, Diana E., Turtle, E. P., Perry, J. E., Porco, C. C. (2006). "Distribution of Viscously Relaxed Craters on Enceladus." American Astronomical Society, DPS meeting #38, #24.07.


Abstract
In 2005, Cassini executed three close flybys of Saturn's moon Enceladus, during which the Imaging Science Subsystem (ISS) observed many regions of diverse terrain, some heavily cratered and others almost devoid of craters. We have documented the craters within the regions for which high-resolution data are available: from approximately 150 to 360 degrees West longitude and -90 to 50 degrees latitude. We find that most relaxed craters are larger than 5 km in diameter. The South Polar Region (approximately -90 to -60 degrees latitude) is practically devoid of any significantly sizeable craters. Interestingly, viscously relaxed craters are found in both the apparently youthful regions of the anti-Saturnian and trailing hemispheres, as well as in the upper northern latitudes. However, while relaxed craters have been identified throughout the regions that have been well imaged, clear examples of craters with morphologies that indicate they have not undergone viscous relaxation are only found in the northern hemisphere (although some craters in the southern hemisphere have ambiguous morphologies). We will present results of mapping, identification, and classification of craters on Enceladus.