Boulder sizes and shapes on asteroids: A comparative study of Eros, Itokawa and Ryugu
Boulder sizes and shapes on asteroids: A comparative study of Eros, Itokawa and Ryugu
复制标题
小行星上巨石的大小和形状:爱神、糸川和龙宫的比较研究
DOI:
10.1016/j.icarus.2020.114282
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发表时间:
2021
期刊:
影响因子:
3.2
通讯作者:
Hagermann Axel
中科院分区:
文献类型:
--
作者:
Michikami Tatsuhiro;Hagermann Axel
In order to understand the geological evolution of asteroids Eros, Itokawa and Ryugu and their collisional history, previous studies investigated boulder size distributions on their surfaces. However, quantitative comparison of these size distributions is hampered by numerous differences between these studies regarding the definition of a boulder's size, measuring technique and the fitting method to determine the power-index of the boulder size distributions. We provide a consistent and coherent model of boulder size distributions by remeasuring the boulders on the entire surfaces of Eros and Itokawa using the Small Body Mapping Tool (SBMT) and combining our observations with the Ryugu data of Michikami et al. (2019). We derived power-indices of the boulder size distributions of −3.25 ± 0.14 for Eros, −3.05 ± 0.14 for Itokawa and −2.65 ± 0.05 for Ryugu. The asteroid with the highest number density of boulders ≥ 5 m turns out to be Ryugu, not Itokawa, as suggested by an earlier study. We show that the appearance of the boulders tends towards more elongated shapes as the size of an asteroid decreases, which can be explained by differences in asteroid gravity and boulder friction angles. Our quantitative observational results indicate that boulder migration preferentially affects smaller boulders, and tends to occur on larger asteroids.
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影响因子:
3.2
作者:
I. DeSouza;M. Daly;O. Barnouin;C. Ernst;E. Bierhaus
通讯作者:
E. Bierhaus
影响因子:
18.3
作者:
K. Walsh;E. Jawin;R. Ballouz;O. Barnouin;E. Bierhaus;H. Connolly;J. Molaro;T. Mccoy;M. Delbo’;C. Hartzell;M. Pajola;S. Schwartz;D. Trang;E. Asphaug;K. Becker;C. Beddingfield;C. Bennett;W. Bottke;K. Burke;B. Clark;M. Daly;D. DellaGiustina;J. Dworkin;C. Elder;D. Golish;A. Hildebrand;R. Malhotra;J. Marshall;P. Michel;M. Nolan;M. Perry;B. Rizk;A. Ryan;S. Sandford;D. Scheeres;H. Susorney;F. Thuillet;D. Lauretta;the OSIRIS-REx Team
通讯作者:
K. Walsh;E. Jawin;R. Ballouz;O. Barnouin;E. Bierhaus;H. Connolly;J. Molaro;T. Mccoy;M. Delbo’;C. Hartzell;M. Pajola;S. Schwartz;D. Trang;E. Asphaug;K. Becker;C. Beddingfield;C. Bennett;W. Bottke;K. Burke;B. Clark;M. Daly;D. DellaGiustina;J. Dworkin;C. Elder;D. Golish;A. Hildebrand;R. Malhotra;J. Marshall;P. Michel;M. Nolan;M. Perry;B. Rizk;A. Ryan;S. Sandford;D. Scheeres;H. Susorney;F. Thuillet;D. Lauretta;the OSIRIS-REx Team
DOI:
--
发表时间:
2019
期刊:
--
影响因子:
--
作者:
M. Pajola;B. Bierhaus;K. Walsh;D. DellaGiustina;E. Jawin;M. Delbo’;J. Molaro;S. Schwartz;R. Ballouz;C. Bennett;B. Rizk;K. Burke;H. Campins;J. Brucato;G. Poggiali;E. Dotto;M. Daly;C. Elder;P. Michel;M. Perry;O. Barnouin;M. Nolan;D. Lauretta
通讯作者:
D. Lauretta
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
F. Capaccioni;P. Cerroni;M. Coradini;M. Martino;P. Farinella;E. Flamini;G. Martelli;P. Paolicchi;P. N. Smith;A. Woodward;V. Zappalá
通讯作者:
V. Zappalá
影响因子:
64.8
作者:
Lauretta, D. S.;DellaGiustina, D. N.;Marty, B.
通讯作者:
Marty, B.