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Surface thermal properties of 67/P inferred by VIRTIS/Rosetta

Leyrat, C. and Erard, S. and Capaccioni, F. and Tosi, F. and Filacchione, G. and Bockelee-Morvan, D. and Capria, M. T. and De Sanctis, M.C. and Drossart, P. and Schmitt, B. and Arnold, Gabriele (2015) Surface thermal properties of 67/P inferred by VIRTIS/Rosetta. In: Geophysical Research Abstracts, 17, p. 9767. EGU General Assembly 2015, 12. April - 17. April 2015, Vienna, Austria.

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Official URL: http://meetingorganizer.copernicus.org/EGU2015/EGU2015-9767.pdf

Abstract

Since August 2014, the VIRTIS imaging spectrometer onboard the Rosetta ESA spacecraft has intensively observed both the nucleus and the coma environment of the comet 67P/Churyumov-Gerasimenko, in the 0.25-5 microns wavelength range. Nucleus observations are performed with both channels: VIRTIS-M for spectral mapping and VIRTIS-H for high spectral resolution. Each spectrum contained both reflected solar light and thermal emission of the surface itself. From the long wavelength range (typically 4-5 microns), we can derive the effective surface temperatures on the dayside at a variety of locations (latitude, longitude) on the surface under diverse conditions of illumination, local times and emission angles. This allows us to infer local thermal properties of the first millimeters of the regolith. Interestingly, the very irregular shape of 67P results in unusual patterns in the heating / cooling regime of the object (e.g. sudden transitions from day to night) which can be used to better understand sublimation processes when ice is present. We will present thermal analyses of observations performed since mid-2014, with a focus on thermo-physical modeling of comet 67P on both regional and local scales. In particular, we will (i) model the diurnal curves in terms of global thermal properties (e.g. diurnal thermal inertia as a function of latitude and temperatures) and we will (ii) investigate possible changes of these properties with heliocentric distance.

Item URL in elib:https://elib.dlr.de/100899/
Document Type:Conference or Workshop Item (Speech)
Title:Surface thermal properties of 67/P inferred by VIRTIS/Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Leyrat, C.LESIAUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIED
Drossart, P.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Date:13 April 2015
Journal or Publication Title:Geophysical Research Abstracts
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:17
Page Range:p. 9767
Status:Published
Keywords:VIRTIS, Rosetta, 67P, thermal properties
Event Title:EGU General Assembly 2015
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:12. April - 17. April 2015
Organizer:European Geosciences Union
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
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:17 Dec 2015 08:50
Last Modified:31 Jul 2019 19:58

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