Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images
Nafiseh Masoumzadeh
(1)
,
Nilda Oklay
(1)
,
Ludmilla Kolokolova
(2)
,
Holger Sierks
(1)
,
Sonia Fornasier
(3)
,
Maria A. Barucci
(3)
,
Jean-Baptiste Vincent
(1)
,
Cécilia Tubiana
(1)
,
Carsten Güttler
(1)
,
Frank Preusker
(4)
,
Frank Scholten
(4)
,
Stefano Mottola
(4)
,
Pedro H. Hasselmann
(3)
,
Clément Feller
(3)
,
Cesare Barbieri
(5)
,
Philippe L. Lamy
(6)
,
R. Rodrigo
(7, 8)
,
D. Koschny
(9)
,
H. Rickman
(10, 11)
,
Michael F. A'Hearn
(2, 1)
,
Jean-Loup Bertaux
(12)
,
I. Bertini
(13)
,
Gabriele Cremonese
(14)
,
V. da Deppo
(15)
,
B. J. R. Davidsson
(10)
,
S. Debei
(16)
,
M. de Cecco
(17)
,
M. Fulle
(18)
,
A. Gicquel
(1)
,
O. Groussin
(6)
,
J. Gutiérrez
(19)
,
I. Hall
(1)
,
M. Hofmann
(1)
,
F. Hviid
(4)
,
W.-H. Ip
(20)
,
L. Jorda
(6)
,
H. U. Keller
(21)
,
J. Knollenberg
(4)
,
G. Kovacs
(1)
,
J.-R. Kramm
(1)
,
Ekkehard Kührt
(4)
,
M. Küppers
(22)
,
M. Lara
(19)
,
M. Lazzarin
(5)
,
J. J. Lopez Moreno
(19)
,
F. Marzari
(5)
,
G. Naletto
(23, 13, 15)
,
X. Shi
(1)
,
N. Thomas
(24)
1
MPS -
Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
2 Department of Astronomy [College Park]
3 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
4 DLR Institut für Planetenforschung
5 Dipartimento di Fisica e Astronomia "Galileo Galilei"
6 LAM - Laboratoire d'Astrophysique de Marseille
7 ISSI - International Space Science Institute [Bern]
8 CAB - Centro de Astrobiologia [Madrid]
9 ESTEC - European Space Research and Technology Centre
10 Department of Physics and Astronomy [Uppsala]
11 CBK - Space Research Centre of Polish Academy of Sciences
12 PLANETO - LATMOS
13 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
14 OAPD - INAF - Osservatorio Astronomico di Padova
15 IFN - CNR Institute for Photonics and Nanotechnologies
16 Department of Industrial Engineering [Padova]
17 UNITN - Università degli Studi di Trento = University of Trento
18 OAT - INAF - Osservatorio Astronomico di Trieste
19 IAA - Instituto de Astrofísica de Andalucía
20 NCU - National Central University [Taiwan]
21 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
22 ESAC - European Space Astronomy Centre
23 DEI - Department of Information Engineering [Padova]
24 Physikalisches Institut [Bern]
2 Department of Astronomy [College Park]
3 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
4 DLR Institut für Planetenforschung
5 Dipartimento di Fisica e Astronomia "Galileo Galilei"
6 LAM - Laboratoire d'Astrophysique de Marseille
7 ISSI - International Space Science Institute [Bern]
8 CAB - Centro de Astrobiologia [Madrid]
9 ESTEC - European Space Research and Technology Centre
10 Department of Physics and Astronomy [Uppsala]
11 CBK - Space Research Centre of Polish Academy of Sciences
12 PLANETO - LATMOS
13 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
14 OAPD - INAF - Osservatorio Astronomico di Padova
15 IFN - CNR Institute for Photonics and Nanotechnologies
16 Department of Industrial Engineering [Padova]
17 UNITN - Università degli Studi di Trento = University of Trento
18 OAT - INAF - Osservatorio Astronomico di Trieste
19 IAA - Instituto de Astrofísica de Andalucía
20 NCU - National Central University [Taiwan]
21 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
22 ESAC - European Space Astronomy Centre
23 DEI - Department of Information Engineering [Padova]
24 Physikalisches Institut [Bern]
Cesare Barbieri
- Fonction : Auteur
- PersonId : 757032
- ORCID : 0000-0002-6257-9076
L. Jorda
- Fonction : Auteur
- PersonId : 746464
- IdHAL : laurent-jorda
- ORCID : 0000-0001-8735-3308
- IdRef : 180975161
Résumé
We aim to explore the behavior of the opposition effect as an important tool in optical remote sensing on the nucleus of comet 67P/ Churyumov-Gerasimenko (67P), using Rosetta-OSIRIS images acquired in different filters during the approach phase, July-August 2014 and the close flyby images on 14 of February 2015, which contain the spacecraft shadow.
We based our investigation on the global and local brightness from the surface of 67P with respect to the phase angle, also known as phase curve. The local phase curve corresponds to a region that is located at the Imhotep-Ash boundary of 67P. Assuming that the region at the Imhotep-Ash boundary and the entire nucleus have similar albedo, we combined the global and local phase curves to study the opposition-surge morphology and constrain the structure and properties of 67P. The model parameters were furthermore compared with other bodies in the solar system and existing laboratory study.
We found that the morphological parameters of the opposition surge decrease monotonically with wavelength, whereas in the case of coherent backscattering this behavior should be the reverse. The results from comparative analysis place 67P in the same category as the two Mars satellites, Phobos and Deimos, which are notably different from all airless bodies in the solar system. The similarity between the surface phase function of 67P and a carbon soot sample at extremely small angles is identified, introducing regolith at the boundary of the Imhotep-Ash region of 67P as a very dark and fluffy layer.
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