The big lobe of 67P/Churyumov–Gerasimenko comet: morphological and spectrophotometric evidences of layering as from OSIRIS data
Sabrina Ferrari
(1)
,
L. Penasa
(1)
,
Fiorangela La Forgia
(2)
,
M. Massironi
(1)
,
G. Naletto
(1, 2, 3)
,
M. Lazzarin
(2)
,
Sonia Fornasier
(4)
,
P. H. Hasselmann
(4)
,
A. Lucchetti
(5)
,
M. Pajola
(5)
,
F. Ferri
(1)
,
P. Cambianica
(1)
,
N. Oklay
(6)
,
C. Tubiana
(7)
,
H. Sierks
(7)
,
Philippe Lamy
(8, 9)
,
R. Rodrigo
(10)
,
D. Koschny
(11)
,
B. Davidsson
(12)
,
Maria Barucci
(4)
,
Jean-Loup Bertaux
(9)
,
Ivano Bertini
(13)
,
Dennis Bodewits
(14)
,
Gabriele Cremonese
(5)
,
Vania da Deppo
(15)
,
S. Debei
(1)
,
M. de Cecco
(16)
,
J. Deller
(7)
,
Michel Franceschi
(17)
,
E. Frattin
(2, 5)
,
Marco Fulle
(18)
,
Olivier Groussin
(8)
,
Pedro J. Gutiérrez
(19)
,
C. Güttler
(7)
,
S. Hviid
(6)
,
W.-H Ip
(20, 21)
,
Laurent Jorda
(8)
,
H. U. Keller
(6, 22)
,
J. Knollenberg
(6)
,
Ekkehard Kührt
(6)
,
M. Kuppers
(23)
,
Luisa Lara
(19)
,
J. Lopez-Moreno
(19)
,
F. Marzari
(2)
,
X. Shi
(7)
,
E. Simioni
(5)
,
N. Thomas
(24, 25)
,
J.-B Vincent
(6)
1
CISAS -
Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
2 Dipartimento di Fisica e Astronomia "Galileo Galilei"
3 IFN - CNR Istituto di Fotonica e Nanotecnologie [Padova]
4 LESIA (UMR_8109) - Laboratoire d'études spatiales et d'instrumentation en astrophysique
5 OAPD - INAF - Osservatorio Astronomico di Padova
6 DLR Institut für Planetenforschung
7 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
8 LAM - Laboratoire d'Astrophysique de Marseille
9 PLANETO - LATMOS
10 CAB - Centro de Astrobiologia [Madrid]
11 RSSD - Research and Scientific Support Department, ESTEC
12 JPL - Jet Propulsion Laboratory
13 Fundacion Galileo Galilei
14 Department of Astronomy [College Park]
15 IFN - CNR Institute for Photonics and Nanotechnologies
16 Department of Industrial Engineering [Padova]
17 Dipartimento di Geoscienze [Padova]
18 OAT - INAF - Osservatorio Astronomico di Trieste
19 IAA - Instituto de Astrofísica de Andalucía
20 IANCU - Institute of Astronomy [Taiwan]
21 SSI - Space Science Institute [Macau]
22 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
23 Operations Department (ESAC)
24 Physikalisches Institut [Bern]
25 CSH - Center for Space and Habitability
2 Dipartimento di Fisica e Astronomia "Galileo Galilei"
3 IFN - CNR Istituto di Fotonica e Nanotecnologie [Padova]
4 LESIA (UMR_8109) - Laboratoire d'études spatiales et d'instrumentation en astrophysique
5 OAPD - INAF - Osservatorio Astronomico di Padova
6 DLR Institut für Planetenforschung
7 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
8 LAM - Laboratoire d'Astrophysique de Marseille
9 PLANETO - LATMOS
10 CAB - Centro de Astrobiologia [Madrid]
11 RSSD - Research and Scientific Support Department, ESTEC
12 JPL - Jet Propulsion Laboratory
13 Fundacion Galileo Galilei
14 Department of Astronomy [College Park]
15 IFN - CNR Institute for Photonics and Nanotechnologies
16 Department of Industrial Engineering [Padova]
17 Dipartimento di Geoscienze [Padova]
18 OAT - INAF - Osservatorio Astronomico di Trieste
19 IAA - Instituto de Astrofísica de Andalucía
20 IANCU - Institute of Astronomy [Taiwan]
21 SSI - Space Science Institute [Macau]
22 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
23 Operations Department (ESAC)
24 Physikalisches Institut [Bern]
25 CSH - Center for Space and Habitability
A. Lucchetti
- Fonction : Auteur
- PersonId : 779422
- ORCID : 0000-0001-7413-3058
M. Pajola
- Fonction : Auteur
- PersonId : 767226
- ORCID : 0000-0002-3144-1277
Vania da Deppo
- Fonction : Auteur
- PersonId : 763247
- ORCID : 0000-0001-6273-8738
Laurent Jorda
- Fonction : Auteur
- PersonId : 746464
- IdHAL : laurent-jorda
- ORCID : 0000-0001-8735-3308
- IdRef : 180975161
Résumé
Between 2014 and 2016, ESA's Rosetta OSIRIS cameras acquired multiple-filters images of the layered nucleus of comet 67P/Churyumov-Gerasimenko, ranging from ultraviolet to near-infrared wavelengths. No correlation between layers disposition and surface spectral variegation has been observed so far. This paper investigates possible spectral differences among decametre-thickness outcropping layers of the biggest lobe of the comet by means of OSIRIS image dataset. A two-classes maximum likelihood classification was applied on consolidated outcrops and relative deposits identified on post-perihelion multispectral images of the big lobe. We distinguished multispectral data on the basis of the structural elevation of the onion-shell Ellipsoidal Model of 67P. The spatial distribution of the two classes displays a clear dependence on the structural elevation, with the innermost class resulting over 50 per cent brighter than the outermost one. Consolidated cometary materials located at different structural levels are characterized by different brightness and revealed due to the selective removal of large volumes. This variegation can be attributed to a different texture of the outcrop surface and/or to a different content of refractory materials.
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