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The various ages of Occator crater, Ceres: Results of a comprehensive synthesis approach

Neesemann, A. and van Gasselt, S. and Schmedemann, Nico and Marchi, S and Walter, S.H.G. and Preusker, Frank and Michael, G.G. and Kneissl, T. and Hiesinger, H. and Jaumann, R and Roatsch, Thomas and Raymond, Carol A. and Russell, Christopher T. (2019) The various ages of Occator crater, Ceres: Results of a comprehensive synthesis approach. Icarus, 320, pp. 60-82. Elsevier. DOI: 10.1016/j.icarus.2018.09.006 ISSN 0019-1035

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0019103517307455?via%3Dihub

Abstract

The 90.5-km Occator crater, with its peculiar and unique bright spots, is one of the most prominent and renowned feature on Ceres. Occator attracted broad public attention in scientific media as it is proposed to exhibit signs of post-impact cryovolcanic activity. In order to understand the time sequence of deposition, several attempts were made during DAWN's primary mission by different research groups to date geomorphologic key units using superposed crater densities. Resulting absolute model formation ages for Occator's ejecta and its interior lobate deposits range from 200 Ma to 78 Ma and about 100 Ma to 6.9 Ma, but were based on different cratering chronology models, measurements on image data at varying resolution, and different statistical and methodological approaches. Here we present the results of a comprehensive approach of determining absolute model formation ages for Occator. This is achieved by using the best resolved Framing Camera image data, by careful treatment of secondary crater admixture and the natural variability of crater detection and sizes by different crater analysts, and by applying appropriate, objective criteria for count area selection. In this context, we evaluate previously published model ages and explain why our results are likely to yield more consistent and robust information about the formation age of Occator. We also show that, in contrast to previous publications, CSFDs measured on Occator’s less competent ejecta blanket, and its more competent cryovolcanic- or impact melt related interior lobate deposits (ILDs), are so similar to each other, that the slight differences might rather be explained by different scaling parameters in different target materials or that the ILDs have formed almost contemporaneously or only shortly after the Occator forming impact.

Item URL in elib:https://elib.dlr.de/131254/
Document Type:Article
Title:The various ages of Occator crater, Ceres: Results of a comprehensive synthesis approach
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neesemann, A.FU BerlinUNSPECIFIED
van Gasselt, S.National Chengchi University, Department of Land Economics, Taipei, TaiwanUNSPECIFIED
Schmedemann, NicoFreie Universitaet , Berlin, Germany.UNSPECIFIED
Marchi, Sswri, boulder co, usaUNSPECIFIED
Walter, S.H.G.freie universität berlin, institut für geologische wissenschaftenUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Michael, G.G.Free University Berlin, GermanyUNSPECIFIED
Kneissl, T.Freie Universität Berlin, Inst. of Geosciences, Planetology and Remote SensingUNSPECIFIED
Hiesinger, H.Institut für Planetologie, Westfälische Wilhelms-Universität, GermanyUNSPECIFIED
Jaumann, Rralf.jaumann (at) dlr.deUNSPECIFIED
Roatsch, ThomasThomas.Roatsch (at) dlr.deUNSPECIFIED
Raymond, Carol A.Jet Propulsion Lab, California Institute of Technology, Pasadena, CA, United States.UNSPECIFIED
Russell, Christopher T.Institute of Geophysics, UCLA, Los Angeles, CA, United States.UNSPECIFIED
Date:1 March 2019
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:320
DOI :10.1016/j.icarus.2018.09.006
Page Range:pp. 60-82
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Dawn, Ceres, ages, crater, occator
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Geology
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:25 Nov 2019 14:55
Last Modified:25 Nov 2019 14:55

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