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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 AuthorsAuthor's ORCID iDORCID Put Code
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIEDUNSPECIFIED
Ciarnello, M.INAF-IASF, ItalyUNSPECIFIEDUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIEDUNSPECIFIED
Raponi, A.INAF-IASF, ItalyUNSPECIFIEDUNSPECIFIED
Erard, S.LESIAUNSPECIFIEDUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIEDUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIEDUNSPECIFIED
Arnold, GabrieleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIEDUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIEDUNSPECIFIED
Piccioni, G.INAF-IASFUNSPECIFIEDUNSPECIFIED
Migliorini, A.INAF-IASFUNSPECIFIEDUNSPECIFIED
Cerroni, P.INAF-IASF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Bellucci, G.INAF-IFSI, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIEDUNSPECIFIED
Jaumann, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stephan, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barucci, AntonellaObservatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
Fornasier, S.Observatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
McCord, Thomas B.Bear Fight Institute, Winthrop, WA, United States.UNSPECIFIEDUNSPECIFIED
Carlson, R. W.Jet Propulsion LaboratoryUNSPECIFIEDUNSPECIFIED
Ammannito, E.INAF, Istituto di Fisica Dello Spazio Interplanetario, Roma, ItalyUNSPECIFIEDUNSPECIFIED
Despan, D.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Blecka, M.Polish Academi of Sciences, Warsaw, PolandUNSPECIFIEDUNSPECIFIED
Moroz, L.V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mottola, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mennella, V.INAF-OAC, Napoli, ItalyUNSPECIFIEDUNSPECIFIED
Beck, P.University Joseph Fourier Grenoble, Grenoble, FranceUNSPECIFIEDUNSPECIFIED
Bonal, L.Université Grenoble Alpes, CNRS, Institut de Planétologie et d’Astrophysique de Grenoble, Grenoble, FranceUNSPECIFIEDUNSPECIFIED
Fonti, S.Dipartimento di Fisica, Università di Lecce, ItalyUNSPECIFIEDUNSPECIFIED
Orofino, V.Dipartimento di Fisica, universita del Salento, Lecce, ItalyUNSPECIFIEDUNSPECIFIED
Merlin, F.LESIA-Observatoire de ParisUNSPECIFIEDUNSPECIFIED
Markus, KathrinWestfälische Wilhelms-Universität MünsterUNSPECIFIEDUNSPECIFIED
Noschese, R.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIEDUNSPECIFIED
Cartacci, M.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIEDUNSPECIFIED
Cicchetti, A.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIEDUNSPECIFIED
Politi, R.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, ItalyUNSPECIFIEDUNSPECIFIED
Henry, FlorenceObservatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
Jacquinod, S.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Date:29 September 2015
Journal or Publication Title:10th European Planetary Science Congress (EPSC)
Refereed publication:No
Open Access:Yes
Gold Open Access: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 Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments (old)
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:31 Jul 2019 19:58

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