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Hydrocode simulations of the largest crater on asteroid Lutetia

Cremonese, G. und Martellato, E. und Marzari, F. und Kührt, E. und Scholten, F. und Preusker, F. und Wünnemann, K. und Borin, P. und Massironi, M. und Simoni, E. und Ip, W-H. und OSIRIS , team (2012) Hydrocode simulations of the largest crater on asteroid Lutetia. Planetary and Space Science, 66 (1), Seiten 147-154. Elsevier. DOI: 10.1016/j.pss.2012.01.001.

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Kurzfassung

The flyby of the Main Belt asteroid Lutetia by the Rosetta spacecraft allows the camera OSIRIS to obtain very good images of about half of the body at the maximum resolution of 60 m per pixel. From the images and radio-science experiment, a density of about (3.4±0.3) g/cm3 has been inferred for the asteroid. Many impact craters have been observed on the surface of Lutetia and the largest, named Massilia, 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 its surface. Whether or not the impact that formed Massilia affected the entire asteroid can be only evaluated via numerical modeling, with hydrocodes, of the impact process. 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 best match to the DTM of the crater with hydrocode simulations has allowed to determine a value of 7.5 km for the impactor diameter, which suggests a primordial origin of Lutetia due to the low probability of such an impact event. A second interesting impact structure has been identified nearby Massilia within the North Pole Crater Cluster. The crater has a diameter of 24 km and it lies over a larger crater of the North Pole Crater Cluster. This is strongly suggestive of a very young structure on Lutetia. The numerical simulations of this feature constrain the impactor to be 3.8 km in diameter, assuming the same material properties for target and impactor as in the model of the formation of Massilia.

Dokumentart:Zeitschriftenbeitrag
Titel:Hydrocode simulations of the largest crater on asteroid Lutetia
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Cremonese, G.INAF-Osservatorio Astronomico, Padova, Italy
Martellato, E.Univ. di Padova, Italy
Marzari, F.INAF-Osservatorio Astronomico, Padova, Italy
Kührt, E.ekkehard.kuehrt@dlr.de
Scholten, F.frank.scholten@dlr.de
Preusker, F.frank.preusker@dlr.de
Wünnemann, K.Museum für Naturkunde, Leibnitz Institute for Research on Evolution and Biodiversity at the Humboldt University, Berlin, Germany
Borin, P. INAF-Osservatorio Astronomico, Padova, Italy
Massironi, M.Department of Geosciences, University of Padova, Italy
Simoni, E.CNR-IFN UOS Luxor, Padova, Italy
Ip, W-H.Institute for Space Science, National Central University, Chung Li, Taiwan
OSIRIS , teamNICHT SPEZIFIZIERT
Datum:2012
Erschienen in:Planetary and Space Science
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:66
DOI :10.1016/j.pss.2012.01.001
Seitenbereich:Seiten 147-154
Verlag:Elsevier
Status:veröffentlicht
Stichwörter: Lutetia; Asteroids; Impacts; Numerical modeling; Cratering; Rosetta
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt ROSETTA Instrumente
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Laura-Maria Brumm
Hinterlegt am:21 Nov 2012 09:51
Letzte Änderung:04 Apr 2013 16:40

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