The cratering history of asteroid (2867) Steins

被引：35
|
作者：
Marchi, S. [1 ]
Barbieri, C. [1 ]
Kuppers, M. [2 ]
Marzari, F. [3 ]
Davidsson, B. [4 ]
Keller, H. U. [5 ]
Besse, S. [6 ]
Lamy, P. [6 ]
Mottola, S. [7 ]
Massironi, M. [8 ]
Cremonese, G. [9 ]
机构：
[1] Univ Padua, Dept Astron, I-35100 Padua, Italy
[2] ESA ESAC, Villanueva De La Canada, Madrid, Spain
[3] Univ Padua, Dept Phys, I-35100 Padua, Italy
[4] Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden
[5] Max Planck Inst Solar Syst Res, Lindau, Germany
[6] Lab Astrophys Marseille, Marseille, France
[7] DLR Berlin, Berlin, Germany
[8] Univ Padua, Dept Geosci, I-35100 Padua, Italy
[9] INAF Padova, Padua, Italy
来源：
PLANETARY AND SPACE SCIENCE | 2010年 / 58卷 / 09期
关键词：
Asteroid (2867) Steins; Asteroid cratering; Asteroid evolution; Main belt asteroids; INDUCED SEISMIC ACTIVITY; COLLISIONAL HISTORY; BELT; ENCOUNTER; STRENGTH; IMAGES; OSIRIS; SYSTEM;
D O I：
10.1016/j.pss.2010.03.017
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The cratering history of main belt asteroid (2867) Steins has been investigated using OSIRIS imagery acquired during the Rosetta flyby that took place on the 5th of September 2008. For this purpose, we applied 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 the cratering history to be estimated. Hence, we derive Steins' cratering retention age, namely the time lapsed since its formation or global surface reset. We also investigate the influence of various factors-like bulk structure and crater erasing-on the estimated age, which spans from a few hundred Myrs to more than 1 Gyr, depending on the adopted scaling law and asteroid physical parameters. Moreover, a marked lack of craters smaller than about 0.6 km has been found and interpreted as a result of a peculiar evolution of Steins cratering record, possibly related either to the formation of the 2.1 km wide impact crater near the south pole or to YORP reshaping. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1116 / 1123
页数：8
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