Application of Implicit 3D Modelling to Reconstruct the Layered Structure of the Comet 67P
Luca Penasa
University of Padova, Center of Studies and Activities for Space (CISAS) “G. Colombo,” Via Venezia 15, 35131, Padova, Italy
Search for more papers by this authorMatteo Massironi
University of Padova, Department of Geosciences, Via G. Gradenigo 6, 35131, Padova, Italy
Search for more papers by this authorEmanuele Simioni
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
CNR-IFN UOS Padova LUXOR, Via Trasea 7, 35131, Padova, Italy
Search for more papers by this authorMarco Franceschi
University of Padova, Department of Geosciences, Via G. Gradenigo 6, 35131, Padova, Italy
Search for more papers by this authorGiampiero Naletto
University of Padova, Center of Studies and Activities for Space (CISAS) “G. Colombo,” Via Venezia 15, 35131, Padova, Italy
CNR-IFN UOS Padova LUXOR, Via Trasea 7, 35131, Padova, Italy
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorSabrina Ferrari
University of Padova, Center of Studies and Activities for Space (CISAS) “G. Colombo,” Via Venezia 15, 35131, Padova, Italy
Search for more papers by this authorIvano Bertini
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorPamela Cambianica
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Search for more papers by this authorElisa Frattin
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorFiorangela La Forgia
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorAlice Lucchetti
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Search for more papers by this authorMaurizio Pajola
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Search for more papers by this authorFrank Preusker
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstraße 23, 12489, Berlin, Germany
Search for more papers by this authorFrank Scholten
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstraße 23, 12489, Berlin, Germany
Search for more papers by this authorLaurent Jorda
Laboratoire d'Astrophysique de Marseille, UMR 7326, CNRS & Aix Marseille Université, 13388, Marseille Cedex 13, France
Search for more papers by this authorRobert Gaskell
Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719, USA
Search for more papers by this authorHolger Sierks
Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Göttingen, Germany
Search for more papers by this authorLuca Penasa
University of Padova, Center of Studies and Activities for Space (CISAS) “G. Colombo,” Via Venezia 15, 35131, Padova, Italy
Search for more papers by this authorMatteo Massironi
University of Padova, Department of Geosciences, Via G. Gradenigo 6, 35131, Padova, Italy
Search for more papers by this authorEmanuele Simioni
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
CNR-IFN UOS Padova LUXOR, Via Trasea 7, 35131, Padova, Italy
Search for more papers by this authorMarco Franceschi
University of Padova, Department of Geosciences, Via G. Gradenigo 6, 35131, Padova, Italy
Search for more papers by this authorGiampiero Naletto
University of Padova, Center of Studies and Activities for Space (CISAS) “G. Colombo,” Via Venezia 15, 35131, Padova, Italy
CNR-IFN UOS Padova LUXOR, Via Trasea 7, 35131, Padova, Italy
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorSabrina Ferrari
University of Padova, Center of Studies and Activities for Space (CISAS) “G. Colombo,” Via Venezia 15, 35131, Padova, Italy
Search for more papers by this authorIvano Bertini
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorPamela Cambianica
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Search for more papers by this authorElisa Frattin
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorFiorangela La Forgia
University of Padova, Department of Physics and Astronomy “Galileo Galilei,” Via Marzolo 8, 35131, Padova, Italy
Search for more papers by this authorAlice Lucchetti
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Search for more papers by this authorMaurizio Pajola
INAF, Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Search for more papers by this authorFrank Preusker
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstraße 23, 12489, Berlin, Germany
Search for more papers by this authorFrank Scholten
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstraße 23, 12489, Berlin, Germany
Search for more papers by this authorLaurent Jorda
Laboratoire d'Astrophysique de Marseille, UMR 7326, CNRS & Aix Marseille Université, 13388, Marseille Cedex 13, France
Search for more papers by this authorRobert Gaskell
Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719, USA
Search for more papers by this authorHolger Sierks
Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Göttingen, Germany
Search for more papers by this authorAndrea Bistacchi
Department of Environmental and Earth Sciences, University of Milano-Bicocca, Milan, Italy
Search for more papers by this authorMatteo Massironi
Department of Geosciences, University of Padua, Padua, Italy
Search for more papers by this authorSummary
We provide details about the procedure employed for the three-dimensional geological modelling of the lobes of comet Churyumov-Gerasimenko (67P). The two lobes of 67P are characterized by well visible terraces and elongated cliffs that revealed a pervasive layering arranged in an onion-like fashion. None of the layers can be traced for a continuity large enough to provide a means of stratigraphic correlation. Therefore, an explicit modelling approach of the layered structure is not easily applicable. We show how a very simple modelling strategy based on implicitly-defined analytical surfaces (spheres or ellipsoids), and requiring very limited operator decision-making, can be successfully applied to produce a geological model that easily fits the available scattered attitude observations. Our formulation has the advantage of providing a small set of parameters with a precise geometrical meaning that can be compared with other parameters of the lobes (i.e. center of ellipsoids and center of mass). The presented method originates outside commercial geological modelling software packages and required devising some ad-hoc solutions for the visualization of the resulting models in comparison with observations made on OSIRIS images. Some extracts of the visualization code, helpful for applying this procedure in similar operational contexts, are also presented.
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