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  The Thermal, Mechanical, Structural, and Dielectric Properties of Cometary Nuclei After Rosetta

Groussin, O., Attree, N., Brouet, Y., Ciarletti, V., Davidsson, B., Filacchione, G., et al. (2019). The Thermal, Mechanical, Structural, and Dielectric Properties of Cometary Nuclei After Rosetta. Space Science Reviews, 215: 29. doi:10.1007/s11214-019-0594-x.

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Genre: Journal Article

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 Creators:
Groussin, O., Author
Attree, N., Author
Brouet, Y., Author
Ciarletti, V., Author
Davidsson, B., Author
Filacchione, G., Author
Fischer, H.-H., Author
Gundlach, B., Author
Knapmeyer, M., Author
Knollenberg, J., Author
Kokotanekova, Rosita1, Author              
Kührt, E., Author
Leyrat, C., Author
Marshall, David W.1, Author              
Pelivan, I., Author
Skorov, Yuri V.1, Author              
Snodgrass, C., Author
Spohn, T., Author
Tosi, F., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Solar system Comets Rosetta Space mission
 Abstract: 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 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 Pa, and have a low bulk thermal inertia of 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.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11214-019-0594-x
 Degree: -

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Title: Space Science Reviews
  Abbreviation : Space Sci Rev
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Dordrecht : Springer Netherlands
Pages: - Volume / Issue: 215 Sequence Number: 29 Start / End Page: - Identifier: ISSN: 0038-6308
CoNE: https://pure.mpg.de/cone/journals/resource/954925446718