Constraints on the recent cratering rate in the saturn system from water ice crystallinity derived crater formation ages on dione

ICE CRYSTALLINITY DERIVED CRATER FORMATION AGES ON DIONE. E. G. Rivera-Valentín1, A. J. López Oquendo2, M. R. Kirchoff3, C. M. Dalle Ore4,5, F. Scipioni4,5; 1Lunar and Planetary Institute, USRA, Houston, TX 77058, 2Dept. of Astronomy and Planetary Science, Northern Arizona University, Flagstaff, AZ, 3Southwest Research Institute, Boulder, CO, 4SETI Institute, Mountain View, CA, 5NASA Ames Research Center, Moffett Field, CA 94035.