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Comet 67P/CG Nucleus Composition and Comparison to Other Comets

Filacchione, G. and Groussin, O and Herny, C. and Kappel, David and Mottola, Stefano and Oklay, Nilda and Pommerol, A. and Wright, I. and Yoldi, Z. and Ciarniello, M. and Moroz, Liubov and Raponi, A (2019) Comet 67P/CG Nucleus Composition and Comparison to Other Comets. Space Science Reviews, 215 (1), pp. 1-46. Springer. DOI: 10.1007/s11214-019-0580-3 ISSN 0038-6308

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Official URL: https://link.springer.com/article/10.1007%2Fs11214-019-0580-3


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.

Item URL in elib:https://elib.dlr.de/130766/
Document Type:Article
Title:Comet 67P/CG Nucleus Composition and Comparison to Other Comets
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Filacchione, G.INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, Rome, ItalyUNSPECIFIED
Groussin, OLaboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Herny, C.Physikalisches Institut, University of Bern, Sidlerstr. 5, CH-3012 Bern, SwitzerlandUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.deUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Oklay, NildaNilda.OklayVincent (at) dlr.dehttps://orcid.org/0000-0002-4909-9692
Pommerol, A.Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, e-mail: antoine.pommerol (at) space.unibe.chUNSPECIFIED
Wright, I.Open University Milton Keynes/UKUNSPECIFIED
Yoldi, Z.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIED
Ciarniello, M.INAF-IASF, Rome, ItalyUNSPECIFIED
Moroz, LiubovLjuba.Moroz (at) dlr.deUNSPECIFIED
Raponi, AINAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, Rome, ItalyUNSPECIFIED
Date:February 2019
Journal or Publication Title:Space Science Reviews
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s11214-019-0580-3
Page Range:pp. 1-46
Keywords:Comets; Composition; Ices; Organic matter; Minerals
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:21 Nov 2019 08:42
Last Modified:21 Nov 2019 08:42

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