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The thermal, mechanical, structural, and dielectric properties of cometary nuclei after Rosetta

Groussin, O. and Attree, N. and Brouet, Y. and Ciarletti, V. and Davidsson, B. and Filaccione, G. and Fischer, H.-H. and Grundlach, B. and Knapmeyer, Martin and Knollenberg, Jörg and Kokotanekova, R. and Kührt, Ekkehard and Leyrat, C. and Marshall, D. and Pelivan, Ivanka and Skorov, Y. and Snodgrass, C. and Spohn, Tilman and Tosi, F. (2019) The thermal, mechanical, structural, and dielectric properties of cometary nuclei after Rosetta. Space Science Reviews, 215 (29). Springer. DOI: 10.1007/s11214-019-0594-x ISSN 0038-6308

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Official URL: https://link.springer.com/article/10.1007/s11214-019-0594-x


The physical properties of cometary nuclei observed today relate to their complex history and help to constrain their formation and evolution. In this article, we review some of the main physical properties of cometary nuclei and focus in particular on the thermal, mechanical, structural and dielectric properties, emphasising the progress made during the Rosetta mission. Comets have a low density of 480±220 kgm −3 480±220 kgm−3 and a low permittivity of 1.9–2.0, consistent with a high porosity of 70–80%, are weak with a very low global tensile strength <100 <100 Pa, and have a low bulk thermal inertia of 0--60 JK −1 m −2 s −1/2 0--60 JK−1m−2s−1/2 that allowed them to preserve highly volatiles species (e.g. CO, CO2, CH4, N2) into their interior since their formation. As revealed by 67P/Churyumov-Gerasimenko, the above physical properties vary across the nucleus, spatially at its surface but also with depth. The broad picture is that the bulk of the nucleus consists of a weakly bonded, rather homogeneous material that preserved primordial properties under a thin shell of processed material, and possibly covered by a granular material; this cover might in places reach a thickness of several meters. The properties of the top layer (the first meter) are not representative of that of the bulk nucleus. More globally, strong nucleus heterogeneities at a scale of a few meters are ruled out on 67P’s small lobe.

Item URL in elib:https://elib.dlr.de/127364/
Document Type:Article
Title:The thermal, mechanical, structural, and dielectric properties of cometary nuclei after Rosetta
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Groussin, O.CNRS. LAM, Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Attree, N.Aix-Marseille Univ., CNRS, Laboratoire d’Astrophysique de Marseille (LAM), rue Frédéric Juliot-Curie, 13388 Marseille CEDEX 13, FranceUNSPECIFIED
Ciarletti, V.Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) (UPSay); Université Pierre et Marie Curie (UPMC) (Sorbonne Univ.); CNRS/INSU; Laboratoire Atmosphéres, Milieux, Observations Spatiales (LATMOS)-Institut Pierre-Simon Laplace (IPSL), 11 Boulevard d’UNSPECIFIED
Davidsson, B.Jet Propulsion Laboratory, M/S 183-301, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Filaccione, G.IASF Istituto Astrofisica Spaziale Fisica Cosmica, Via Fosso Cavaliere 100, 00133 Roma, ItalyUNSPECIFIED
Fischer, H.-H.DLR-Köln, Hans-Herbert.Fischer (at) dlr.deUNSPECIFIED
Grundlach, B.Inst. für Geophysik und extraterrestrische Physik, Techn. Univ. Braunschweig, Mendelssohnstr 3, D-38106 Braunschweig, GermanyUNSPECIFIED
Knapmeyer, MartinMartin.Knapmeyer (at) dlr.dehttps://orcid.org/0000-0003-0319-2514
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Kokotanekova, R.Max Planck Institute for Solar System Research Göttingen, Planetary and Space Scinces, The Open University Milton KeynesUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Leyrat, C.LESIA, Observatoire de Paris, PSL Research UniversityUNSPECIFIED
Marshall, D.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Pelivan, IvankaIvanka.Pelivan (at) dlr.de, Helmoholtz Centre PotsdamUNSPECIFIED
Skorov, Y.Institut fur Geophysik und extraterrestrische Physik, Universität Braunschweig & Max Planck Institute für Solar System Research GöttingenUNSPECIFIED
Snodgrass, C.Planetary and Space Sciences, Department of Physical Sciences, The Open University, Milton Keynes MK7 6AA, UKUNSPECIFIED
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Date:5 May 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/s11214-019-0594-x
Springer, VerlagUNSPECIFIED
Series Name:Space Sciene Review
Keywords:Solar System, comets, Rosetta, Space mission
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 Lander
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Planetary Physics
Deposited By: Herrmann, Astrid
Deposited On:23 May 2019 14:41
Last Modified:23 May 2019 14:41

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