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Local study of photometric variations at comet 67P/Churyumov-Gerasimenko: a point of view from VIRTIS/Rosetta

Rousseau, Batiste and Erard, S. and Capaccioni, F. and Filacchione, G. and Bockelee-Morvan, D. and Leyrat, C. and Arnold, Gabriele and Ciarniello, M. and Longobardo, A and Kappel, David (2016) Local study of photometric variations at comet 67P/Churyumov-Gerasimenko: a point of view from VIRTIS/Rosetta. In: Comets Symposium: A new vision after Rosetta and Philae, p. 120. Comets Symposium: A new vision after Rosetta and Philae, Toulouse 14-18 November 2016, 14-18 November 2016, Toulouse.

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Official URL: http://www.comets2016toulouse.com

Abstract

From August 2014 to September 2016, the Rosetta spacecraft has been orbiting comet 67P and has obtained information on the origin and evolution of comet. VIRTIS, the Visible, Infrared and Thermal Imaging Spectrometer collected reflectance spectra of the nucleus surface with two different channels: VIRTIS-M and VIRTIS-H. The first one is an imaging spectrometer ranging from 0.25 to 5.1 μm and it covers a large field of view. The second one is a point spectrometer ranging from 1.9 to 5.0 μm with higher spectral resolution. Both channels observed comet 67P under many different illumination conditions and observation geometries (e.g., between 20° to 110° phase angle). VIRTIS spectra revealed a very low single scattering albedo of 0.06 @ 0.65 μm and red slopes in the visible and in the near infrared (Capaccioni et al., 2015; Ciarniello et al., 2015). Thanks to the long duration of the Rosetta mission it is possible to perform a photometric study through time and to monitor potential changes of surface spectral properties (e.g. spectral slope, single scattering albedo) associated with varying activity. In this context, we defined specific periods of observation and compared them between each other to identify surface changes. Using a Lommel-Seeliger model as a first step, we studied the spatial distribution of the single scattering albedo (SSA) and spectral slope at the local or regional scale. In the period between the end of 2014 and the beginning of 2015, we observe SSA variations which are neither spatially homogeneous nor uniform (i.e., increase and decrease). These changes, observed both in the visible and in the NIR, may be related to different processes such as dust deposit/removal or changes in the ice content in the sub-surface. We’ve also used a Hapke model to evaluate the effect of the photometric function on the results. We will also study other periods of observations, in particular around perihelion in August 2015 when the activity was reaching a maximum. VIRTIS-M infrared cryocooler has failed in April 2015 and it is no longer possible to investigate the photometric variations in this wavelength range on large areas. However investigations are still possible with the visible channel.

Item URL in elib:https://elib.dlr.de/115315/
Document Type:Conference or Workshop Item (Poster)
Title:Local study of photometric variations at comet 67P/Churyumov-Gerasimenko: a point of view from VIRTIS/Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rousseau, BatistelesiaUNSPECIFIED
Erard, S.lesiaUNSPECIFIED
Capaccioni, F.inaf-iasf, italyUNSPECIFIED
Filacchione, G.inaf-iasf, rome, italyUNSPECIFIED
Bockelee-Morvan, D.observatoire de paris, meudonUNSPECIFIED
Leyrat, C.lesiaUNSPECIFIED
Arnold, Gabrielegabriele.arnold (at) dlr.deUNSPECIFIED
Ciarniello, M.inaf-iasf, italyUNSPECIFIED
Longobardo, Ainaf-laps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Kappel, Daviddavid.kappel (at) dlr.deUNSPECIFIED
Date:November 2016
Journal or Publication Title:Comets Symposium: A new vision after Rosetta and Philae
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:p. 120
Status:Published
Keywords:VIRTIS, Rosetta, 67P, photometry
Event Title:Comets Symposium: A new vision after Rosetta and Philae, Toulouse 14-18 November 2016
Event Location:Toulouse
Event Type:international Conference
Event Dates:14-18 November 2016
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
Deposited By: Kappel, David
Deposited On:20 Nov 2017 15:09
Last Modified:20 Nov 2017 15:09

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