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Conference Papers Year : 2015

Mass, Density and Composition of the Nucleus 67P/Churyumov-Gerasimenko

Martin Paetzold
  • Function : Author
Tom Andert
  • Function : Author
Matthias Hahn
  • Function : Author
Sami W. Asmar
  • Function : Author
Jean-Pierre Barriot
  • Function : Author
Michael K. Bird
  • Function : Author
Bernd Häusler
  • Function : Author
Kerstin Peter
Silvia A. Tellmann
  • Function : Author
Eberhard Grün
  • Function : Author
Paul Weissman
  • Function : Author
Holger Sierks
  • Function : Author
Frank Preusker
  • Function : Author
Frank Scholten
  • Function : Author

Abstract

Cometary nuclei consist mostly of dust and water ice, but the internal structure of a comet nucleus is essentially unknown. Bulk properties such as mass, volume (size and shape), and particularly the density, must be known for constraining its internal structure. The radio science experiment RSI on the Rosetta spacecraft derived the mass and the gravity field of comet 67P/Churyumov-Gerasimenko at distances varying between 100 km and 10 km, and together with the current best estimates of the volume by the OSIRIS camera, the bulk density of the nucleus. A model of the internal structure is derived from the information of two shape models by comparing observed and theoretical gravity coefficients. The comet nucleus appears to be a body of low mass, low density and high porosity with approximately four times more dust than ice by mass and 1.5 times more dust than ice by volume.
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Dates and versions

insu-03580893 , version 1 (18-02-2022)

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Martin Paetzold, Tom Andert, Matthias Hahn, Sami W. Asmar, Jean-Pierre Barriot, et al.. Mass, Density and Composition of the Nucleus 67P/Churyumov-Gerasimenko. American Astronomical Society, 2015, à renseigner, Unknown Region. p.2644-2652. ⟨insu-03580893⟩
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