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The cratering history of asteroid (21) Lutetia

Marchi, S. und Massironi, M. und Vincent, J.-B. und Morbidelli, A. und Mottola, S. und Marzari, F. und Küppers, M. und Besse, S. und Thomas, N. und Barbieri, C. und Naletto, G. und Sierks, H. (2012) The cratering history of asteroid (21) Lutetia. Planetary and Space Science (66), Seiten 87-95. DOI: 10.1016/j.pss.2011.10.010. ISSN 00320633.

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Offizielle URL: http://dx.doi.org/10.1016/j.pss.2011.10.010

Kurzfassung

The European Space Agency's Rosetta spacecraft passed by the main belt asteroid (21) Lutetia on 10th July 2010. With its ∼100 km size, Lutetia is one of the largest asteroids ever imaged by a spacecraft. During the flyby, the on-board OSIRIS imaging system acquired spectacular images of Lutetia's northern hemisphere revealing a complex surface scarred by numerous impact craters, reaching the maximum dimension of about 55 km. In this paper, we assess the cratering history of the asteroid. For this purpose, we apply current models describing the formation and evolution of main belt asteroids, that provide the rate and velocity distributions of impactors. These models, coupled with appropriate crater scaling laws, allow us to interpret the observed crater size-frequency distribution (SFD) and constrain the cratering history. Thanks to this approach, we derive the crater retention age of several regions on Lutetia, namely the time lapsed since their formation or global surface reset. We also investigate the influence of various factors – like Lutetia's bulk structure and crater obliteration – on the observed crater SFDs and the estimated surface ages. From our analysis, it emerges that Lutetia underwent a complex collisional evolution, involving major local resurfacing events till recent times. The difference in crater density between the youngest and oldest recognized units implies a difference in age of more than a factor of 10. The youngest unit (Beatica) has an estimated age of tens to hundreds of Myr, while the oldest one (Achaia) formed during a period when the bombardment of asteroids was more intense than the current one, presumably around 3.6 Gyr ago or older.

Dokumentart:Zeitschriftenbeitrag
Titel:The cratering history of asteroid (21) Lutetia
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Marchi, S.Observatoire de la Cote d’Azur
Massironi, M.Padova University
Vincent, J.-B.Max Planck Institute for Solar System Research
Morbidelli, A.Observatoire de la Cote d’Azur
Mottola, S.stefano.mottola@dlr.de
Marzari, F.Padova University
Küppers, M.ESA-ESAC
Besse, S.Laboratoire d’Astrophysique de Marseille
Thomas, N.University of Bern
Barbieri, C.Padova University
Naletto, G.Padova University
Sierks, H.Max Planck Institute for Solar System Research
Datum:2012
Erschienen in:Planetary and Space Science
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI :10.1016/j.pss.2011.10.010
Seitenbereich:Seiten 87-95
ISSN:00320633
Status:veröffentlicht
Stichwörter:Asteroid (21) Lutetia; Asteroid cratering; Asteroid evolution; Main belt asteroids
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Projekt ROSETTA Instrumente (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Dr.phys. Stefano Mottola
Hinterlegt am:19 Sep 2012 08:24
Letzte Änderung:26 Mär 2013 13:33

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