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Analysis of Steins Cratering History Using the OSIRIS/ROSETTA Images

Marchi, S. and Barbieri, C. and Casotto, S. and Cremonese, G. and Da Peppo, V. and Ferri, F. and Lazzarin, M. and Magrin, S. and Martellato, E. and Marzari, F. and Mottola, S. and Simioni, E. (2009) Analysis of Steins Cratering History Using the OSIRIS/ROSETTA Images. In: Bulletin of the American Astronomical Society, 41, p. 558. American Astronomical Society. 41th DPS Meeting, 4.-9. Okt. 2009, Puerto Rico.

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Abstract

We present a preliminary analysis of the craters on the asteroid Steins images obtained by OSIRIS, the imaging system on board the ESA mission ROSETTA, during the flyby on 5th September 2008. Steins has been observed at the closest distance of about 800 km achieving the maximum resolution of 80 m/px. Several small-to-medium craters have been identified, in addition to few very large craters: one of them is nearly 2 km across. The images show also the superposition of small craters on larger ones, and some structure that may represent the remnant of old degraded craters. A structure of chain-like craters has also been identified. All the craters have been counted in order to get the cumulative number per square km. Then we have applied our model to estimate the collisional age of Steins using the most recent modeling of the current population of the Main Belt asteroids (Bottke et al., 2005) to define the impactor flux. The model uses the scaling law of Holsapple and Housen (2007) to determine the crater diameter as a function of the impactor radius.

Document Type:Conference or Workshop Item (Poster)
Title:Analysis of Steins Cratering History Using the OSIRIS/ROSETTA Images
Authors:
AuthorsInstitution or Email of Authors
Marchi, S.Univ. di Padova, Italy
Barbieri, C.Univ. di Padova, Italy
Casotto, S.Univ. di Padova, Italy
Cremonese, G.Univ. di Padova, Italy
Da Peppo, V.Univ. di Padova, Italy
Ferri, F.Univ. di Padova, Italy
Lazzarin, M.Univ. di Padova, Italy
Magrin, S.Univ. di Padova, Italy
Martellato, E.Univ. di Padova, Italy
Marzari, F.Univ. di Padova, Italy
Mottola, S.UNSPECIFIED
Simioni, E.Univ. di Padova, Italy
Date:2009
Journal or Publication Title:Bulletin of the American Astronomical Society
Volume:41
Page Range:p. 558
Publisher:American Astronomical Society
Series Name:BAAS
Status:Published
Keywords:Rosetta, cratering, asteroids, Steins
Event Title:41th DPS Meeting
Event Location:Puerto Rico
Event Type:international Conference
Event Dates:4.-9. Okt. 2009
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt ROSETTA Instrumente (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Dr.phys. Stefano Mottola
Deposited On:05 Jan 2010 19:25
Last Modified:01 Mar 2010 08:35

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