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Comet 67P/CG compositional maps at regional scale in the VIS-IR from Rosetta/VIRTIS-M

Filacchione, G. and Capaccioni, F. and Erard, S. and De Sanctis, M.C. and Tosi, F. and Ciarnello, M. and Raponi, A. and Capria, M. T. and Piccioni, G. and Leyrat, C. and Bockelee-Morvan, D. and Drossart, P. and Arnold, Gabriele and Ip, W-H. and McCord, Thomas B. and Schmitt, B. and Flamini, E. and Quirico, E. and Beck, P. (2014) Comet 67P/CG compositional maps at regional scale in the VIS-IR from Rosetta/VIRTIS-M. In: Eos Trans. AGU, Fall Meet. Suppl., P32B-08-P32B-08. AGU Fall meeting, 15 Dec - 19 Dec 2014, San Francisco, California (USA).

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Official URL: https://agu.confex.com/agu/fm14/meetingapp.cgi/Paper/20785


In August 2014 ESA’s Rosetta mission has started the exploration of 67P/Churyumov-Gerasimenko comet nucleus. VIRTIS-M, the Visible InfraRed Thermal Imaging Spectrometer, onboard the orbiter (Coradini et al., 2007) has acquired the entire nucleus’ illuminated hemisphere in the 0.25-5.1 µm spectral range from a heliocentric distance of 3.2 AU. These data allow us to derive albedo and compositional maps suitable to trace the distribution of dust and refractory material, water and carbon dioxide ices, and other minor species. Two different mapping phases are currently foreseen: 1) in August 2014 during early “Comet Characterization (CC)” period, when the spacecraft will orbit between 50-100 km distance from the nucleus with 25°-40° solar phase angle. A large number of these observations shall be performed at stationary illumination conditions (constant solar phase at about 30°) allowing us to reduce the effect of photometric corrections on surface’s mosaics; 2) in September 2014 during the “Global Mapping Phase (GMP)” when the spacecraft shall be at about 30 km distance and 60°-70° phase. During these two periods, VIRTIS-M on-ground resolution shall be about 12-25 and 7.5 m/pixel, respectively. The GMP is planned for more detailed observations of some pre-selected Philae landing sites, although in worse illumination conditions with respect to the CC. In addition, to mitigate the effects of the expected compositional differences, surface roughness and the highly irregular double-lobed shape of the comet’s nucleus, we have planned to observe each surface’s point more than one time at different illumination conditions. Finally, compositional maps are built by using specific VIS-IR spectral indicators (Filacchione et al., 2012) namely: band ratios, spectral slopes, band parameters (depth, position, width, asymmetry) adapted to characterize the different spectral classes of the nucleus’ surface. Beyond being appropriate to map surface composition, those indicators allow us to infer regolith grain size and surface roughness and to correlate them with local morphological features (patches, boulders, scarps, crevasses, active areas) and thermal properties. Authors acknowledge the funding from Italian, French and German Space Agencies.

Item URL in elib:https://elib.dlr.de/101354/
Document Type:Conference or Workshop Item (Speech)
Title:Comet 67P/CG compositional maps at regional scale in the VIS-IR from Rosetta/VIRTIS-M
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIEDUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIEDUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIEDUNSPECIFIED
Drossart, P.Observatoire de Paris, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Ip, W-H.Institute for Space Science, National Central University, Chung Li, TaiwanUNSPECIFIEDUNSPECIFIED
McCord, Thomas B.Bear Fight Institute, Winthrop, WA, United States.UNSPECIFIEDUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIEDUNSPECIFIED
Flamini, E.ASI, Agenzia Spaziale Italiana, viale Liegi 26, 00198 Rome, Italy; Lunar and Planetary Laboratory and Steward Observatory, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIEDUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIEDUNSPECIFIED
Beck, P.Laboratoire de Planétologie de Grenoble (LPG) - University Joseph Fourier Grenoble, Grenboble, FranceUNSPECIFIEDUNSPECIFIED
Date:17 December 2014
Journal or Publication Title:Eos Trans. AGU, Fall Meet. Suppl.
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:P32B-08-P32B-08
Keywords:VIRTIS, Rosetta, 67P, composition
Event Title:AGU Fall meeting
Event Location:San Francisco, California (USA)
Event Type:international Conference
Event Dates:15 Dec - 19 Dec 2014
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 > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:05 Jan 2016 13:01
Last Modified:23 May 2016 22:55

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