Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101716

Title:	Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images
Authors:	葉永烜;El-Maarry, M. R.;Thomas, N.;Giacomini, L.;Massironi, M.;Pajola, M.;Marschall, R.;Gracia-Berná, A.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Rickman, H.;Koschny, D.;Keller, H. U.;Agarwal, J.;A’Hearn, M. F.;Auger, A.-T.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Besse, S.;Bodewits, D.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;De Cecco, M.;Debei, S.;Güttler, C.;Fornasier, S.;Fulle, M.;Groussin, O.;Gutierrez, P. J.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kovacs, G.;Kramm, J.-R.;Kührt, E.;Küppers, M.;La Forgia, F.;Lara, L. M.;Lazzarin, M.;Lopez Moreno, J. J.;Marchi, S.;Marzari, F.;Michalik, H.;Naletto, G.;Oklay, N.;Pommerol, A.;Preusker, F.;Scholten, F.;Tubiana, C.;Vincent, J.-B.
Contributors:	理學院天文研究所
Keywords:	Astrophysics;Comet nuclei;Comets;comets: general;comets: individual: 67P/Churyumov-Gerasimenko;Earth and Planetary Astrophysics;Failure;Heterogeneity;Lobes;methods: observational;Morphology;Regional;Sciences of the Universe
Date:	2015-11-01
Issue Date:	2026-04-21 14:41:32 (UTC+8)
Publisher:	EDP Sciences
Abstract:	摘要： Aims. The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)’s nucleus at spatial resolutions down to ~0.17 m/px ever since Aug. 2014. These images have yielded unprecedented insight into the morphological diversity of the comet’s surface. This paper presents an overview of the regional morphology of comet 67P. Methods. We used the images that were acquired at orbits ~20–30 km from the center of the comet to distinguish different regions on the surface and introduce the basic regional nomenclature adopted by all papers in this Rosetta special feature that address the comet’s morphology and surface processes. We used anaglyphs to detect subtle regional and topographical boundaries and images from close orbit (~10 km from the comet’s center) to investigate the fine texture of the surface. Results. Nineteen regions have currently been defined on the nucleus based on morphological and/or structural boundaries, and they can be grouped into distinctive region types. Consolidated, fractured regions are the most common region type. Some of these regions enclose smooth units that appear to settle in gravitational sinks or topographically low areas. Both comet lobes have a significant portion of their surface covered by a dusty coating that appears to be recently placed and shows signs of mobilization by aeolian-like processes. The dusty coatings cover most of the regions on the surface but are notably absent from a couple of irregular large depressions that show sharp contacts with their surroundings and talus-like deposits in their interiors, which suggests that short-term explosive activity may play a significant role in shaping the comet’s surface in addition to long-term sublimation loss. Finally, the presence of layered brittle units showing signs of mechanical failure predominantly in one of the comet’s lobes can indicate a compositional heterogeneity between the two lobes. 出版者： EDP Sciences 出版日期： 2015-11-01 出處： Astronomy & Astrophysics, 2015-11, Vol.583, p.A26- 資源來源： EDP Sciences 版權： CC0 1.0 - Universal 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201525723
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	20	View/Open

社群 sharing

Loading...