Hydrocode simulations of the largest crater on asteroid Lutetia

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題名:	Hydrocode simulations of the largest crater on asteroid Lutetia
作者:	葉永烜;Cremonese, G.;Martellato, E.;Marzari, F.;Kuhrt, E.;Scholten, F.;Preusker, F.;Wünnemann, K.;Borin, P.;Massironi, M.;Simioni, E.;Ip, W.
貢獻者:	理學院天文研究所
關鍵詞:	Asteroids;Astronomy and Astrophysics;Cratering;Impacts;Lutetia;Numerical modeling;Rosetta;Space and Planetary Science
日期:	2012-06-01
上傳時間:	2026-04-21 14:14:46 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	摘要： 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 60m 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 55km. Relative to the size of Lutetia (the longest axis is approximately 126km) 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 7.5km 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 24km 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 3.8km in diameter, assuming the same material properties for target and impactor as in the model of the formation of Massilia. ► Hydrocode iSALE simulations of the largest crater on the asteroid Lutetia. ► iSALE simulations of one component of the North Polar Crater Cluster having the diameter of 24km. ► The largest crater of 55km has been simulated with an impactor of 7.5km and the 24km with an impactor of 3.8km. ► The hydrocode fit the two craters diameter/depth without assuming a crust. ► A pre-fracturated layer could have been created in the largest crater generation. 出版者： Elsevier Ltd 出版日期： 2012-06 出處： Planetary and Space Science, 2012-06, Vol.66 (1), p.147-154 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 Elsevier Ltd 識別號： ISSN: 0032-0633 識別號： EISSN: 1873-5088 識別號： DOI: 10.1016/j.pss.2012.01.001
顯示於類別:	[天文研究所] 期刊論文

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