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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28621
Title: Comet 67P/CG Nucleus Composition and Comparison to Other Comets
Authors: FILACCHIONE, GIANRICO 
Groussin, Olivier
Herny, Clémence
Kappel, David
Mottola, Stefano
Oklay, Nilda
Pommerol, Antoine
Wright, Ian
Yoldi, Zurine
CIARNIELLO, Mauro 
Moroz, Lyuba
RAPONI, Andrea 
Issue Date: 2019
Journal: SPACE SCIENCE REVIEWS 
Number: 215
Issue: 1
First Page: 19
Abstract: We review our current knowledge of comet 67P/Churyumov-Gerasimenko nucleus composition as inferred from measurements made by remote sensing and in-situ instruments aboard Rosetta orbiter and Philae lander. Spectrophotometric properties (albedos, color indexes and Hapke parameters) of 67P/CG derived by Rosetta are discussed in the context of other comets previously explored by space missions. Composed of an assemblage made of ices, organic materials and minerals, cometary nuclei exhibit very dark and red surfaces which can be described by means of spectrophotometric quantities and reproduced with laboratory measurements. The presence of surface water and carbon dioxide ices was found by Rosetta to occur at localized sites where the activity driven by solar input, gaseous condensation or exposure of pristine inner layers can maintain these species on the surface. Apart from these specific areas, 67P/CG's surface appears remarkably uniform in composition with a predominance of organic materials and minerals. The organic compounds contain abundant hydroxyl group and a refractory macromolecular material bearing aliphatic and aromatic hydrocarbons. The mineral components are compatible with a mixture of silicates and fine-grained opaques, including Fe-sulfides, like troilite and pyrrhotite, and ammoniated salts. In the vicinity of the perihelion several active phenomena, including the erosion of surface layers, the localized activity in cliffs, fractures and pits, the collapse of overhangs and walls, the transfer and redeposition of dust, cause the evolution of the different regions of the nucleus by inducing color, composition and texture changes.
URI: http://hdl.handle.net/20.500.12386/28621
URL: https://link.springer.com/article/10.1007/s11214-019-0580-3
ISSN: 0038-6308
DOI: 10.1007/s11214-019-0580-3
Bibcode ADS: 2019SSRv..215...19F
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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Filacchione_CG_composition_ISSI_SSR_accepted_01142019.pdfpostprint33.16 MBAdobe PDFView/Open
Filacchione_etal_SSR_215_2019b.pdf[Administrators only]13.45 MBAdobe PDF
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