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The influence of recent major crater impacts on the surrounding surfaces of (21) Lutetia

Jutzi, M. and Thomas, N. and Benz, W. and El Maarry, M.R. and Jorda, L. and Kührt, E. and Preusker, Frank (2013) The influence of recent major crater impacts on the surrounding surfaces of (21) Lutetia. Icarus: International Journal of Solar System Studies, 226, pp. 89-100. Elsevier. DOI: 10.1016/j.icarus.2013.05.022 ISSN 0019-1035

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Official URL: http://dx.doi.org/10.1016/j.icarus.2013.05.022


We present 3-D simulations of impacts into Asteroid 21 Lutetia, the subject of a fly-by by the European Space Agency’s Rosetta mission to Comet 67P/Churyumov-Gerasimenko. Using a 3-D shape model of the asteroid, impacts of sizes sufficient to reproduce the observed craters in Lutetia’s North Polar Crater Cluster (NPCC) as observed by the OSIRIS experiment have been simulated using the Smoothed Particle Hydrodynamics technique. The asteroid itself has been modelled both as a homogeneous body and as a body with an iron core. Crater erasure in the vicinity of the NPCC has been observed by OSIRIS. The results show that this erasure has most probably been caused by ejecta deposition following the impact of a 2.3 km diameter projectile impacting at a velocity of 5 km s1 (or an impact with similar energy). This would produce a crater of roughly 34 km in diameter comparable to the largest (and oldest) member of the NPCC. Erasure of craters via the shock associated with such an impact is shown to be less significant and does not reproduce the observed spatial distribution of erased craters or ‘‘ghost’’ craters. Time series of the surface velocity fields resulting from the simulated impacts are also presented. It is suggested that the surface velocity field and velocity shear may play a role in the generation of lineaments. Our model calculations show that the velocity field lines around 50 s after impact exhibit a reasonable qualitative correlation with the orientation of lineaments observed on the entire visible surface of Lutetia. It is also shown that incorporation of a core of 25–30 km in diameter does not modify the velocity field evolution with time and, as such, the presence or otherwise of such a core cannot be inferred from lineament observations if this concept for their formation is valid.

Item URL in elib:https://elib.dlr.de/83176/
Document Type:Article
Title:The influence of recent major crater impacts on the surrounding surfaces of (21) Lutetia
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jutzi, M.Physikalisches Institut, University of BernUNSPECIFIED
Thomas, N.Physikalisches Institut, University of Bern, CHUNSPECIFIED
Benz, W.Physikalisches Institut, University of Bern; SchweizUNSPECIFIED
El Maarry, M.R.Physikalisches Institut, University of Bern; SchweizUNSPECIFIED
Jorda, L.Laboratoire d’Astrophysique de Marseille, Marseille, FranceUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Date:2 June 2013
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2013.05.022
Page Range:pp. 89-100
Keywords:Asteroids, surfaces Impact processes Cratering Collisional physics
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 > Asteroids and Comets
Deposited By: Kührt, Dr.rer.nat. Ekkehard
Deposited On:19 Sep 2013 09:37
Last Modified:31 Jul 2019 19:41

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