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Compositional maps of 67P/CG nucleus after perihelion passage by VIRTIS-M aboard Rosetta

Filacchione, G. and Capaccioni, F. and Ciarnello, M. and Tosi, F. and De Sanctis, M.C. and Raponi, A. and Erard, S. and Bockelee-Morvan, D. and Leyrat, C. and Arnold, Gabriele and Schmitt, B. and Quirico, E. and Piccioni, G. and Migliorini, A. and Cerroni, P. and Palomba, E. and Bellucci, G. and Longobardo, A and Jaumann, R. and Stephan, K. and Barucci, Antonella and Fornasier, S. and McCord, Thomas B. and Carlson, R. W. and Ammannito, E. and Despan, D. and Blecka, M. and Moroz, L.V. and Mottola, S. and Mennella, V. and Beck, P. and Bonal, L. and Fonti, S. and Orofino, V. and Merlin, F. and Markus, Kathrin and Noschese, R. and Cartacci, M. and Cicchetti, A. and Politi, R. and Henry, Florence and Jacquinod, S. (2015) Compositional maps of 67P/CG nucleus after perihelion passage by VIRTIS-M aboard Rosetta. In: 10th European Planetary Science Congress (EPSC), 10, p. 169. European Planetary Science Congress 2015, 27 Sep - 02 Oct 2015, Nantes, France.

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Official URL: http://meetingorganizer.copernicus.org/EPSC2015/EPSC2015-169.pdf

Abstract

Comet 67P/Churyumov-Gerasimenko undergoes periherm transit at 1.2 AU in August 2015. During this passage the illumination conditions above the south hemisphere of the nucleus rapidly improve becoming optimal for the retrieval of the surface properties by VIRTIS-M onboard Rosetta. A similar mapping of the surface at about 12.5 m/pixel and at solar phases below 40 deg has been already performed during the Philae prelanding phase (August-September 2014, heliocentric distance 3.6 AU) allowing us to build compositional maps of the entire north hemisphere and equatorial regions down to latitudes -50 deg on a limited part of the Hapi, or the comet’s neck, region. One year after this first mapping campaign the illumination geometry becomes favorable to complete the coverage above the South polar region. Since comet’s activity is rapidly increasing and the Rosetta spacecraft cannot orbit on low trajectories like during the prelanding phase, the south hemisphere maps shall be reasonably observed by VIRTIS-M with a spatial resolution of about 25 m/pixel. Global scale data have shown that the nucleus’ double-lobe surface is characterized by morphologically different units uniformly covered by a very dark, low-albedo, dehydrated organic-rich material. Compositional properties across the different regions of the nucleus are mapped by measuring visible and infrared spectral slopes, calculated on the best linear fit to the reflectance spectra between 0.5-0.8 μm and 1-2.5 μm, respectively. As pre-landing data have clearly shown, spectral slopes are highly diagnostic to identify active areas, like in the Hapi area, and exposed water ice deposits where the spectra appear less red. As heliocentric distance decreases and diurnal temperatures increase, the 3-5 μm spectral range becomes affected by thermal emission from the surface. This emission is overlapping with the 3 μm feature previously observed by VIRTIS during the pre-landing period making more difficult to retrieve the distribution of the organic material. A summary of the spectral characteristics observed on the south hemisphere region during the perihelion passage is given. Activity-driven spectral changes observed before and after perihelion passage on some specific areas of the surface are discussed.

Item URL in elib:https://elib.dlr.de/100881/
Document Type:Conference or Workshop Item (Speech)
Title:Compositional maps of 67P/CG nucleus after perihelion passage by VIRTIS-M aboard Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Ciarnello, M.INAF-IASF, ItalyUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIED
Raponi, A.INAF-IASF, ItalyUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIED
Piccioni, G.INAF-IASFUNSPECIFIED
Migliorini, A.INAF-IASFUNSPECIFIED
Cerroni, P.INAF-IASF, Rome, ItalyUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIED
Bellucci, G.INAF-IFSI, Rome, ItalyUNSPECIFIED
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Stephan, K.katrin.stephan (at) dlr.deUNSPECIFIED
Barucci, AntonellaObservatoire de Paris-Meudon, FranceUNSPECIFIED
Fornasier, S.Observatoire de Paris-Meudon, FranceUNSPECIFIED
McCord, Thomas B.Bear Fight Institute, Winthrop, WA, United States.UNSPECIFIED
Carlson, R. W.Jet Propulsion LaboratoryUNSPECIFIED
Ammannito, E.INAF, Istituto di Fisica Dello Spazio Interplanetario, Roma, ItalyUNSPECIFIED
Despan, D.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIED
Blecka, M.Polish Academi of Sciences, Warsaw, PolandUNSPECIFIED
Moroz, L.V.Ljuba.moroz (at) dlr.deUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Mennella, V.INAF-OAC, Napoli, ItalyUNSPECIFIED
Beck, P.University Joseph Fourier Grenoble, Grenoble, FranceUNSPECIFIED
Bonal, L.Université Grenoble Alpes, CNRS, Institut de Planétologie et d’Astrophysique de Grenoble, Grenoble, FranceUNSPECIFIED
Fonti, S.Dipartimento di Fisica, Università di Lecce, ItalyUNSPECIFIED
Orofino, V.Dipartimento di Fisica, universita del Salento, Lecce, ItalyUNSPECIFIED
Merlin, F.LESIA-Observatoire de ParisUNSPECIFIED
Markus, KathrinWestfälische Wilhelms-Universität MünsterUNSPECIFIED
Noschese, R.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIED
Cartacci, M.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIED
Cicchetti, A.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIED
Politi, R.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIED
Henry, FlorenceObservatoire de Paris-Meudon, FranceUNSPECIFIED
Jacquinod, S.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIED
Date:29 September 2015
Journal or Publication Title:10th European Planetary Science Congress (EPSC)
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Volume:10
Page Range:p. 169
Series Name:EPSC Abstracts
Status:Published
Keywords:VIRTIS, Rosetta, 67P, composition
Event Title:European Planetary Science Congress 2015
Event Location:Nantes, France
Event Type:international Conference
Event Dates:27 Sep - 02 Oct 2015
Organizer:Europlanet
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Planetary Geology
Deposited By: Kappel, David
Deposited On:17 Dec 2015 08:15
Last Modified:17 Dec 2015 08:15

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