Fractures on comet 67P/Churyumov-Gerasimenko observed by Rosetta/OSIRIS

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101285

Title:	Fractures on comet 67P/Churyumov-Gerasimenko observed by Rosetta/OSIRIS
Authors:	葉永烜;El-Maarry, M. R.;Thomas, N.;Gracia-Berná, A.;Marschall, R.;Auger, A.-T.;Groussin, O.;Mottola, S.;Pajola, M.;Massironi, M.;Marchi, S.;Höfner, S.;Preusker, F.;Scholten, F.;Jorda, L.;Kührt, E.;Keller, H. U.;Sierks, H.;A'Hearn, M. F.;Barbieri, C.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;Debei, S.;De Cecco, M.;Deller, J.;Güttler, C.;Fornasier, S.;Fulle, M.;Gutierrez, P. J.;Hofmann, M.;Hviid, S. F.;Ip, W.-H.;Knollenberg, J.;Koschny, D.;Kovacs, G.;Kramm, J.-R.;Küppers, M.;Lamy, P. L.;Lara, L. M.;Lazzarin, M.;Lopez Moreno, J. J.;Marzari, F.;Michalik, H.;Naletto, G.;Oklay, N.;Pommerol, A.;Rickman, H.;Rodrigo, R.;Tubiana, C.;Vincent, J.-B.
Contributors:	理學院天文研究所
Keywords:	Astrophysics;Comet 67P;Comet nuclei;Comets;Contraction;Daily temperatures;Earth and Planetary Astrophysics;Erosion;Evolution;Formations;Fracture mechanics;Fractures;Gradients;Imaging techniques;Infrared imaging;Insolation;Insulating materials;Mathematical morphology;Morphology;Nuclei;Nucleus;OSIRIS;Perihelions;Rosetta;Rosetta mission;Sciences of the Universe;Spacecraft;Temperature;Temperature effects;Temperature gradients;Temperature range;Thermal analysis;Thermal contraction;Thermal insulation;Thermal models;Topology;Weathering
Date:	2015-01-01
Issue Date:	2026-04-21 14:29:18 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： AbstractThe Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) experiment onboard the Rosetta spacecraft currently orbiting comet 67P/Churyumov‐Gerasimenko has yielded unprecedented views of a comet's nucleus. We present here the first ever observations of meter‐scale fractures on the surface of a comet. Some of these fractures form polygonal networks. We present an initial assessment of their morphology, topology, and regional distribution. Fractures are ubiquitous on the surface of the comet's nucleus. Furthermore, they occur in various settings and show different topologies suggesting numerous formation mechanisms, which include thermal insulation weathering, orbital‐induced stresses, and possibly seasonal thermal contraction. However, we conclude that thermal insolation weathering is responsible for creating most of the observed fractures based on their morphology and setting in addition to thermal models that indicate diurnal temperature ranges exceeding 200 K and thermal gradients of ~15 K/min at perihelion are possible. Finally, we suggest that fractures could be a facilitator in surface evolution and long‐term erosion. 其他題名： Geophys. Res. Lett 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2015-07-16 出處： Geophysical Research Letters, 2015-07, Vol.42 (13), p.5170-5178 資源來源： Wiley Online Library Journals 版權： 2015. American Geophysical Union. All Rights Reserved. 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 0094-8276 識別號： ISSN: 1944-8007 識別號： EISSN: 1944-8007 識別號： DOI: 10.1002/2015GL064500
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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