Three-Dimensional Views of the Nucleus of Comet 67P/Churyumov-Gerasimenko - Application to the Characterization of Active Pits - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Three-Dimensional Views of the Nucleus of Comet 67P/Churyumov-Gerasimenko - Application to the Characterization of Active Pits

Résumé

The Narrow Angle Camera (NAC) of the OSIRIS imaging system aboard ESA's Rosetta spacecraft has acquired approximately 25000 images of the surface of the nucleus of comet 67P/Churyumov-Gerasimenko at various spatial scales down to centimeters per pixel. The bulk of these images have been obtained in sequences and the combined displacement of the Rosetta orbiter along its trajectory and the rotation of the nucleus allow associating many pairs of images appropriate to stereoscopic viewing. This is achieved by constructing anaglyphs after rotating the images so that the relative shift appears horizontal. The shift is set to limit the parallax to approximately 2° (with a maximum value of 4°) for the foreground so as to avoid image deformation. A time of writing, approximately 1100 anaglyphs have been produced. In addition to offering spectacular stereoscopic views of the nucleus, these anaglyphs allow studying the topography of the nucleus at spatial scales unachievable by DTMs. Further coupling with spectral images, we have been able to locate ice patches at the bottom of several narrow pits which indicate the presence of sub-surface ice at depths of a few meters. These narrow pits are most likely the sources of collimated jets widely seen in the coma of 67PC-G.
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Dates et versions

insu-04511916 , version 1 (19-03-2024)

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Philippe Lamy, G. Faury, D. Romeuf, O. Groussin, D. Nebouy. Three-Dimensional Views of the Nucleus of Comet 67P/Churyumov-Gerasimenko - Application to the Characterization of Active Pits. American Geophysical Union, Fall Meeting 2018, Dec 2018, washington, United States. pp.abstract #P23G-3522. ⟨insu-04511916⟩
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