Geometric preprocessing for measurements of comet 67P acquired by Rosetta’s Visible and InfraRed Thermal Imaging Spectrometer, Mapping channel (VIRTIS-M)
Comet 67P/Churyumov-Gerasimenko (hereafter 67P) was the primary target of ESA's Rosetta mission. Hyperspectral images acquired by the Mapping channel of the Visible and InfraRed Thermal Imaging Spectrometer aboard Rosetta can be used to derive physical and compositional surface properties by detailed spectrophotometric analyses. This calls for a precise spatial co-registration between measurements and geometry information. In this work, we improve the wavelength-dependent co-registration and also the spatial consistency of the radiometric calibration. This is accomplished by applying a feature-based image matching method comparing measured 67P nucleus images from the entire mission to corresponding photometric simulations. The derived geometric distortions suggest previously unaccounted optical aberrations of the instrument, in conjunction with non-systematic spacecraft pointing and perspective errors, and discrepancies between the true nucleus shape at data acquisition time and the used digital shape model.
Authors
- G. Filacchione (ORCID: https://orcid.org/0000-0001-9567-0055)
- L. V. Moroz (ORCID: https://orcid.org/0000-0002-1550-7758)
- F. Tosi (ORCID: https://orcid.org/0000-0003-4002-2434)
- G. Arnold (ORCID: https://orcid.org/0000-0002-2899-5009)
- David Kappel (ORCID: https://orcid.org/0000-0002-0518-5548)
- F. Capaccioni (ORCID: https://orcid.org/0000-0003-1631-4314)
- A. Raponi (ORCID: https://orcid.org/0000-0003-4996-0099)
- M. Ciarniello (ORCID: https://orcid.org/0000-0002-7498-5207)
- C. Leyrat (ORCID: https://orcid.org/0000-0002-5313-7735)
- S. Érard (ORCID: https://orcid.org/0000-0002-9099-8366)
- E. D’Aversa (ORCID: https://orcid.org/0000-0002-5842-5867)
Institutions
- Centre National de la Recherche Scientifique (FR)
- Janssen (Belgium) (BE)
- University of Potsdam (DE)
- Université Paris Cité (FR)
- Université Paris Sciences et Lettres (FR)
- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) (DE)
- Sorbonne Université (FR)
- Institute for Space Astrophysics and Planetology (IT)
- Laboratoire d’études spatiales et d’instrumentation en astrophysique (FR)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
Publication Details
- Journal
- Review of Scientific Instruments
- Published
- 2024-12-01
- DOI
- https://doi.org/10.1063/5.0226387
- Citations
- 1
- Primary Topic
- Astro and Planetary Science
- Type
- article
- Field-Weighted Citation Impact
- 0.33
Funders
- National Aeronautics and Space Administration
- Deutsche Forschungsgemeinschaft
- Centre National d’Etudes Spatiales
- Science and Technology Facilities Council