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Hydrocode simulations of few Lutetia craters

Cremonese, G. and Martellato, E. and Marzari, F. and Kuehrt, E. and Scholten, Frank and Preusker, Frank and Wunnemann, K. and Borin, P. and Massironi, Matteo and Simioni, E. and IP, W.H. (2011) Hydrocode simulations of few Lutetia craters. EPSC-DPS, 02.Okt.-07.Okt., Nantes, Frankreich.

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Abstract

The flyby of the Main Belt asteroid Lutetia by the Rosetta spacecraft allows the camera OSIRIS to obtain very good images of about half body at the maximum resolution of 60 m per pixel. Moreover, the data obtained by the Rosetta instruments include the asteroid density of about (3.4 ± 0.3) g/cm3. Many impact craters have been observed on the surface of Lutetia. The largest among them is called Massilia and has a diameter of about 55 km. Relative to the size of Lutetia (the longest axis is approximately 126 km) the crater represents one of the dominating features on the surface. Whether the impact that formed the crater affected the entire asteroid can only be estimated from numerical analysis of hydrocode modeling of the impact processes. The results of a suite of iSALE simulations are compared with the crater profile derived from the Digital Terrain Model of the observed surface. The final hydrocode simulations allowed to determine the impactor size having a diameter of 7.5 km which suggests a primordial origin of Lutetia due to the low probability for such an impact event. A second interesting impact structure has been identified nearby Massilia within the North Pole Crater Cluster. This crater, having a diameter of 24 km and lying over the other craters of the North Pole Crater Cluster, seems to be the youngest largest structure of Lutetia.- The numerical simulations of this feature constrain the impactor to be of 3.8 km in diameter, assuming the same material properties for target and impactor as in the model of the formation of Massilia.

Document Type:Conference or Workshop Item (Speech)
Title:Hydrocode simulations of few Lutetia craters
Authors:
AuthorsInstitution or Email of Authors
Cremonese, G.Osservatorio Astronomico, Padova, Italy
Martellato, E.Univ. di Padova, Italy
Marzari, F.Università di Padova, Departimento di Fisica, Padova, Italy
Kuehrt, E.ekkehard.kuehrt@dlr.de
Scholten, Frankfrank.scholten@dlr.de
Preusker, Frankfrank.preusker@dlr.de
Wunnemann, K. Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin
Borin, P. Osservatorio Astronomico, Padova, Italy
Massironi, MatteoINAF, Padova, I
Simioni, E.Univ. di Padova, Italy
IP, W.H.National Central University
Date:2011
Status:Published
Keywords:Rosetta Lutetia Hydrocode Crater
Event Title:EPSC-DPS
Event Location:Nantes, Frankreich
Event Type:international Conference
Event Dates:02.Okt.-07.Okt.
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 ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Frank Preusker
Deposited On:10 Jan 2012 09:19
Last Modified:10 Jan 2012 09:19

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