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VIRTIS/Rosetta Observes Comet 67P/Churyumov-Gerasimenko: Nucleus and Coma Derived Composition and Physical Properties.

Capaccioni, F. and Filacchione, G. and Erard, S. and Arnold, Gabriele and De Sanctis, M.C. and Bockelee-Morvan, D. and Leyrat, C. and Tosi, F. and Ciarnello, M. and Raponi, A. and Migliorini, A. and Quirico, E. and Rinaldi, G. and Schmitt, B. and Carlson, R. W. and Combi, M. and Fink, U. and Tozzi, G. and Palomba, E. and Longobardo, A and Formisano, M. and Debout, V. and Drossart, P. and Piccioni, G. and Fougere, N. (2015) VIRTIS/Rosetta Observes Comet 67P/Churyumov-Gerasimenko: Nucleus and Coma Derived Composition and Physical Properties. In: Eos Trans. AGU, Fall Meet. Suppl., P33E-04-P33E-04. AGU Fall meeting, 14 Dec - 18 Dec 2015, San Francisco, California (USA).

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Official URL: https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/79223


The paper will describe the major results obtained throughout the nominal mission by the instrument VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer), the dual channel spectrometer onboard Rosetta, on the surface composition and thermal properties of the nucleus of comet 67P/Churyumov-Gerasimenko and on the 2D distribution of H2O and CO2 in the coma. VIRTIS is a dual channel spectrometer; VIRTIS-M (M for Mapper) is a hyper spectral imager covering a wide spectral range from 0.25 through 5μm. VIRTIS-M uses a slit and a scan mirror to generate images with spatial resolution of 250 μrad over a FOV of 3.7°. The second channel is VIRTIS-H (H for High-resolution), a point spectrometer with high spectral resolution (λ/Δλ=3000 @3μm) in the range 2-5 μm. The nucleus observations have been performed in a wide range of conditions with best spatial resolution of 2.5m. The surface temperature has been determined since the first distant observations when the nucleus filled one single VIRTIS-M pixel and continuously monitored since. Maximum temperature determined until April 2015 are as high as 300K at the subsolar point. Modeling of the thermophysical properties allowed to derive the thermal inertia of the crust. The VIRTIS composition analysis has showed evidence of carbon-bearing compounds on the nucleus of the comet 67P/Churyumov-Gerasimenko. The very low reflectance of the nucleus (normal albedo of 0.060 ± 0.003 at 0.55 µm), the spectral slopes in VIS and IR ranges (5-25 and 1.5-5 % kÅ-1) and the broad absorption feature in the 2.9-3.6 µm range present across the entire illuminated surface, are compatible with a surface crust made of a complex mixture of dark disordered poly-aromatic compounds, opaque minerals and several chemical species containing: -COOH, CH2 / CH3, -OH (in Alcohols) and possibly NH4+. Both channels are contributing to the determination of the spatial distribution of H2O and CO2 in the coma; their abundances as a function of altitude and of time of day. Authors acknowledge the support from national funding agencies.

Item URL in elib:https://elib.dlr.de/101351/
Document Type:Conference or Workshop Item (Speech)
Title:VIRTIS/Rosetta Observes Comet 67P/Churyumov-Gerasimenko: Nucleus and Coma Derived Composition and Physical Properties.
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIEDUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIEDUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIEDUNSPECIFIED
Rinaldi, G.Istituto di Fisica dello Spazio Interplanetario (IFSI-INAF), Rome - ItalyUNSPECIFIEDUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIEDUNSPECIFIED
Carlson, R. W.Jet Propulsion LaboratoryUNSPECIFIEDUNSPECIFIED
Combi, M.Space Physics Research Laboratory, The University of Michigan, Ann Arbor, USAUNSPECIFIEDUNSPECIFIED
Fink, U.Lunar Planetary Laboratory, Univarsity of Arizona, Tucson, USAUNSPECIFIEDUNSPECIFIED
Tozzi, G.Osservatorio Astrofisico di Arcetri, Firenze, ItalyUNSPECIFIEDUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIEDUNSPECIFIED
Debout, V.LESIA, Observatoire de Paris/CNRS/UPMC/Université Paris-Diderot, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Drossart, P.Observatoire de Paris, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Fougere, N.University of Michigan, Ann Harbor, MI 48109, USAUNSPECIFIEDUNSPECIFIED
Date:16 December 2015
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:P33E-04-P33E-04
Keywords:VIRTIS, Rosetta, 67P, composition
Event Title:AGU Fall meeting
Event Location:San Francisco, California (USA)
Event Type:international Conference
Event Dates:14 Dec - 18 Dec 2015
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 12:58
Last Modified:23 May 2016 22:55

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