Program and Abstracts 11th Planetary Crater Consortium Meeting August 5-7, 2020 Wednesday, August 5, 2020 12:00 p.m. EDT Crater Populations, Surface Ages, and Crater Databases Thursday, August 6, 2020 12:00 p.m. EDT Crater Morphology and Morphometry 3:15 p.m. EDT Crater Ejecta and Secondaries Friday, August 7, 2020 12:00 p.m. EDT Terrestrial Impacts 2:50 p.m. EDT Crater Modification and Climate Effects Print Only Crater Morphology and Morphometry Crater Populations, Surface Ages, and Crater Databases Laboratory Experiments Terrestrial Impacts Wednesday, August 5, 2020 CRATER POPULATIONS, SURFACE AGES, AND CRATER DATABASES 12:00 p.m. EDT Moderators: Michelle Kirchoff and Stuart Robbins Times Authors (*Denotes Presenter) Abstract Title and Summary 12:00 p.m. Welcome Comments 12:15 p.m. Ipatov S. I. * Feoktistova E. A. Estimates of the Number of Near-Earth Objects Based on the Number Svetsov V. V. of Lunar Craters Formed During the Last Billion Years [#2038] Time variations of the number of near-Earth objects were studied based on the number of lunar craters formed during the last billion years. 12:40 p.m. Williams J.-P. * Pathare A. V. The Influence of Terrain Properties on Small Crater Populations on Costello E. S. Giordano Bruno [#2071] Variations in terrain properties are partly responsible for discrepancies in crater counts observed on the ejecta of Giordano Bruno. 1:05 p.m. Giguere T. A. * Boyce J. M. Lunar Mare Basalt Age and Composition in Northeastern Gillis-Davis J. J. Stopar J. D. Oceanus Procellarum [#2070] Absolute model ages and geochemical averages determined for portions of NE Oceanus Procellarum. Mare surface age varies by location; FeO/TiO2 is uniform. Differing ages may indicate that mare volcanism occurred over a long period of time (>1.5 Ga). 1:30 p.m. DISCUSSION 1:55 p.m. Break Times Authors (*Denotes Presenter) Abstract Title and Summary 2:15 p.m. Daubar I. J. * Gao A. New Craters on Mars: An Updated Catalog [#2069] Wexler D. Dundas C. We currently know of more than 1,000 new dated impact sites on McEwen A. Neidhart T. Mars, each with formation date constraints from orbital imaging. We Miljkovic K. Eschenfelder J. are gathering data on all known sites in a single unified catalog to be Collins G. S. Piqueux S. made available to the community. Malin M. Posiolova L. 2:40 p.m. Munje M. J. * Daubar I. J. Large-Scale Automated Detection of Fresh Impacts on Mars Using Doran G. Wagstaff K. L. Machine Learning with CTX Observations [#2065] Mandrake L. Scanning across Mars / Deep learning seeks fresh impacts / Will we find new ones? 3:05 p.m. Zain P. S. * de Elia G. C. Impacts on Ceres and Vesta [#2052] Di Sisto R. P. We perform a collisional study of Ceres and Vesta using a six-part collisional evolution model of the main belt. We obtain size- frequency distribution of impactors and identify the contribution of each part of the main belt to the impactors. 3:30 p.m. Costello E. S. * Burkhard L. M. Crater Size Frequency Distributions Reveal the Relative Age of Sulci Cameron M. E. on Ganymede [#2063] We digitized craters in a recently published map of Ganymede and were able to produce crater size frequency distributions that demonstrate the relative age of individual geologic units. 3:55 p.m. Break 4:15 p.m. Rossignoli N. L. * Di Sisto R. P. Modeling Impact Cratering on Titan [#2024] Parisi M. G. We model Titan’s crater size distribution considering Centaur objects as the main impactors and compare our results with updated observational crater counts, obtaining the surface age for each crater diameter. 4:40 p.m. Abedin A. Y. * Kavelaars J. J. Collision Probabilities in the Edgeworth-Kuiper Belt [#2044] Greenstreet S. Gladman B. We investigate the intrinsic collision probabilities in the Kuiper belt Petit J-M. Bannister M. with implications for dust production rate in the trans-Neptunian Lawler S. Alexandersen M. region, as well as to better understand the collisional outcome Volk K. Gwyn S. Chen Y-T. between small icy bodies. 5:05 p.m. DISCUSSION Thursday, August 6, 2020 CRATER MORPHOLOGY AND MORPHOMETRY 12:00 p.m. EDT Moderator: Lillian Ostrch Times Authors (*Denotes Presenter) Abstract Title and Summary 12:00 p.m. Minton D. A. * Altair R. Modeling Realistic Initial Morphology of Complex Craters with Blevins A. M. Fassett C. I. Perlin Noise [#2068] Hirabayashi M. Hear the silent Moon / But not with ears pressed to sky / A noise made from code. 12:25 p.m. Chandra R. * Stopar J. Constraining Impact Melt Volumes in Simple Craters Zanetti M. Using Topography [#2075] We present a methodology to produce an upper bound on the volume of impact melt confined to the bottoms of simple impact craters using DTM data. 12:50 p.m. Wren P. F. * Fevig R. A. Examining Doublet Craters on the Lunar Maria to Constrain Binary Asteroids in the Near-Earth Population [#2061] Surveyed lunar maria for doublet impact craters down to 1 km in diameter. Ongoing work intends to place a lower bound on the percentage of near-Earth asteroids that are binary systems. Times Authors (*Denotes Presenter) Abstract Title and Summary 1:15 p.m. Zeilnhofer M. F. * Barlow N. G. Latitudinal Variations in Crustal Strength Across Ceres as Revealed by Its Impact Craters [#2023] Crater interior morphologies and polygonal impact craters were investigated to determine the latitudinal variations in crustal strength across Ceres to further understand the dwarf planet’s formation and evolution. 1:40 p.m. Break 2:00 p.m. Aponte-Hernández B. * Rivera- Morphometric Study of Craters On Rhea [#2074] Valentín E. G. Kirchoff M. R. Morphometric analysis of craters on Rhea reveal past heat flow Schenk P. M. events dominant in crater relaxation. We identify two crater populations that are distinct and may represent young craters, and impact-modified craters. 2:25 p.m. Robbins S. J. * Schenk P. M. Depths of Pluto’s and Charon’s Craters, and Their Simple-to- Riggs J. D. Parker A. H. Complex Transition [#2056] Bray V. J. Beddingfield C. B. Measuring things is / Hard. Statistics can sometimes / Help. Yay, Beyer R. A. Verbiscer A. J. crater conf. Binzel R. Runyon K. D. 2:50 p.m. DISCUSSION Thursday, August 6, 2020 CRATER EJECTA AND SECONDARIES 3:15 p.m. EDT Moderator: Jamie Riggs Times Authors (*Denotes Presenter) Abstract Title and Summary 3:15 p.m. Martin-Wells K. S. * Partee J. Distal Impact Melt Flow Contacts with Tycho Secondary Nebel-Crosson J. Crater Chains [#2053] The impact melt flows reported here are commonly observed on steep, Tycho-facing slopes. Arcuate ridges and lobate, blocky margins are observed on steep slopes. Cracks and smooth surfaces are more common in nearby regions with shallower slopes. 3:40 p.m. Singer K. N. * McKinnon W. B. Maximum Secondary Crater Sizes and Maximum Ejecta Fragments at Jolliff B. L. Escape Velocity: Analysis from Six Secondary Crater Fields on the Moon [#2049] We examine secondary craters to estimate the size and velocity of ejecta fragments that formed them. We characterize secondary crater size-range distributions and also ejecta fragment size-velocity distributions with quantile regression. 4:05 p.m. Break 4:25 p.m. Kirchoff M. R. * Robbins S. J. Perplexing Erosion of Martian Radial Ejecta [#2058] Grimm R. E. Riggs J. D. Our study of the formation ages of adjacent layered and radial ejecta craters on Mars has been complicated by the erosion and classification of radial ejecta. We describe these complications and their mitigation for further work. 4:50 p.m. Barlow N. G. * Tornabene L. L. Extensive Outer Ejecta Deposit Surrounding Fresh Impact Craters: Comparing Mars and the Moon [#2059] A continuous outer ejecta deposit extends beyond the normal ejecta rampart for fresh craters on Mars. We propose to conduct a study of fresh impact craters on the Moon to determine if this extensive deposit is also seen there. 5:15 p.m. DISCUSSION Friday, August 7, 2020 TERRESTRIAL IMPACTS 12:00 p.m. EDT Moderator: Tenielle Gaither Times Authors (*Denotes Presenter) Abstract Title and Summary 12:00 p.m. Kletetschka G. * Ocampo A. U. Electric Discharge Evidence Found in Pook’s Pebbles, New Class of Zila V. Elbra T. Chicxulub Ejecta [#2026] Magnetic characterization of the Albion Formation Pook’s Pebble revealed an exposure to electric currents that provides insights into the debris cloud environment during the initial phases of debris excavation. 12:25 p.m. Huber M. S. * Kovaleva E. Evaluating the Emplacement Mechanisms of Vredefort Impact Clark M. D. Fourie F. Melt Dikes [#2016] Melt dikes in the crystalline core of the Vredefort structure disappear a few m below the surface, but near the core-collar boundary, they are deeper. A new composition is found at the boundary. The dikes were emplaced due to long-term modification. 12:50 p.m. Moore A. Kennett J. P. High-Temperature Melting at >2200 °C Provides Evidence of Cosmic Napier W. M. Bunch T. E. Impact at Abu Hureya, Syria at the Younger Dryas Onset Weaver J. C. LeCompte M. (~12.8 KA) [#2054] Adedeji A. V. Hackley P. We provide the collective evidence best explained by the Kletetschka G. * Hermes R. E. hypothesis that at least one high-energy, high-temperature, Wittke J. Razink J. J. hypervelocity airburst occurred near Abu Hureyra ~12,800 years Gaultois M. W. West A. ago, possibly accompanied by ground impacts. 1:15 p.m. Klokočník J. Kostelecký J. Detection of 200 km Suspected Impact Crater Kotuykanskaya Near Bezdĕk A. Kletetschka G. * Popigai Siberia, by New Gravity Aspects from EIGEN 6C4, and Staňková H.