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Photometric properties of comet 67P/Churyumov-Gerasimenko from VIRTIS-M aboard Rosetta

Ciarniello, Mauro and Capaccioni, F. and Filacchione, G. and Raponi, A. and Tosi, F. and De Sanctis, Maria Cristina and Capria, M. T. and Erard, Stéphane and Bockelée-Morvan, Dominique and Leyrat, C. and Arnold, Gabriele and Barucci, Antonella and Beck, P. and Bellucci, G. and Fornasier, Sonia and Longobardo, Andrea and Mottola, Stefano and Palomba, E. and Quirico, E. and Schmitt, B. (2015) Photometric properties of comet 67P/Churyumov-Gerasimenko from VIRTIS-M aboard Rosetta. Astronomy & Astrophysics, 583, A31. EDP Sciences. doi: 10.1051/0004-6361/201526307. ISSN 0004-6361.

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After a cruise phase of more than ten years the Rosetta spacecraft entered orbit around comet 67P/Churyumov-Gerasimenko (CG) on 6 August 2014. From this date the spacecraft began to escort the comet and will follow it till the end of the nominal mission (December 2015). This allowed very accurate nucleus imaging making 67P/CG the sixth comet to be directly observed from a spacecraft after 1P/Halley , 9P/Temple 1, 19P/Borrelly, 81P/Wild 2 and 103P/Hartley 2. The Rosetta orbiter carries eleven instruments and among these, VIRTIS, the Visible and Infrared Thermal Imaging Spectrometer (Coradini et al. 2007). This experiment is composed of two sensor heads, -M (Mapper) and -H (High resolution). The -H sensor is a high resolution punctual spectrometer mainly devoted to the study of the coma properties in the 1.88-5.03 micrometers, while -M produces hyperspectral images of the target in the 0.2-5.1 micrometers range with an angular resolution of 250 micr-rad x 250 micro-rad. Data from VIRTIS-M are crucial to assess nucleus spectrophotometric properties: on global scale with disk-integrated observations and, thanks to its imaging capabilities, at larger spatial resolutions with disk-resolved measurements. The latter case is of paramount importance in order to map compositional variability on the surface and possibly link it to sources of activity. This work focuses on VIRTIS-M data acquired from July 2014 up to February 37 2015. The analysis we performed is divided into two main subjects: full-disk photometry (sec. 2) and disk-resolved photometry (sec. 3). In sec. 2, we discuss rotational curves (sec. 2.1), full-disk phase curves (sec. 2.2), color ratios (sec. 2.3) and the derivation of the geometric albedo (sec. 2.4). In sec. 3, taking advantage of the large dataset acquired by VIRTIS-M we calculate a photometric reduction by means of a Hapke simplified model thus assessing the spectrophotometric properties of the surface. Also a zonal photometric reduction has been derived for four macro-regions, in order to better investigate compositional and morphological differences on the nucleus (sec. 3.5). In sec. 4 the full-disk and the disk-resolved dataset are used together to derive a complete phase curve of the comet. Finally a comparison to photometric properties of other comets is shown in sec. 5 and in sec. 6 a summary of the main findings is reported as well as a discussion of future developments of this work with new observations in the coming months.

Item URL in elib:https://elib.dlr.de/96941/
Document Type:Article
Title:Photometric properties of comet 67P/Churyumov-Gerasimenko from VIRTIS-M aboard Rosetta
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Capaccioni, F.Istituto di Astrofisica Spaziale, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
De Sanctis, Maria CristinaIstituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIEDUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIEDUNSPECIFIED
Erard, StéphaneLESIA, UMR CNRS 8109, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon Cédex, FranceUNSPECIFIEDUNSPECIFIED
Bockelée-Morvan, DominiqueObservatoire de Paris-Meudon, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Leyrat, C.Università di Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Barucci, AntonellaObservatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
Beck, P.Austrian Research Centers, ARC, Radiation Safety and Applications Division, A-2444 Seibersdorf, AustriaUNSPECIFIEDUNSPECIFIED
Fornasier, SoniaObservatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
Longobardo, AndreaINAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, Via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIEDUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIEDUNSPECIFIED
Schmitt, B.Laboratoire de Glaciologie et Geophysique de l'Environment, Grenoble, FranceUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:A31
Publisher:EDP Sciences
Keywords:photometric properties, comet, 67P/ Churyumov-Gerasimenko, VIRTIS-M, Rosetta
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
Deposited By: Bründl, Tara-Marie
Deposited On:08 Dec 2015 12:48
Last Modified:08 Mar 2018 18:22

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