Photometry of dust grains of comet 67P and connection with nucleus regions
Gabriele Cremonese
(1)
,
Emanuele Simioni
(1, 2)
,
Roberto Ragazzoni
(1)
,
Ivano Bertini
(3)
,
Fiorangela La Forgia
(4)
,
Maurizio Pajola
(3)
,
Nilda Oklay
(5)
,
Sonia Fornasier
(6)
,
Monica Lazzarin
(4)
,
Alice Lucchetti
(1, 3)
,
Holger Sierks
(5)
,
Cesare Barbieri
(4)
,
Philippe Lamy
(7)
,
Rafael Rodrigo
(8, 9)
,
Detlef Koschny
(10)
,
Hans Rickman
(11, 12)
,
Horst U. Keller
(13)
,
Michael F. A'Hearn
(14)
,
Jessica Agarwal
(5)
,
Maria Antonella Barucci
(6)
,
Jean-Loup Bertaux
(15)
,
Vania da Deppo
(2)
,
Björn Davidsson
(12)
,
Mariolino de Cecco
(16)
,
Stefano Debei
(17)
,
Marco Fulle
(18)
,
Olivier Groussin
(7)
,
Carsten Güttler
(5)
,
Pedro J. Gutiérrez
(19)
,
Stubbe F. Hviid
(20)
,
Wing-Huen Ip
(21)
,
Laurent Jorda
(7)
,
Jörg Knollenberg
(20)
,
J.-Rainer Kramm
(5)
,
Michael Kueppers
(22)
,
Ekkehard Kührt
(20)
,
Luisa M. Lara
(19)
,
Sara Magrin
(4)
,
Jose J. Lopez Moreno
(19)
,
Francesco Marzari
(4)
,
Stefano Mottola
(20)
,
Giampiero Naletto
(3, 2, 23)
,
Frank Preusker
(20)
,
Frank Scholten
(20)
,
Nicholas Thomas
(24)
,
Cécilia Tubiana
(5)
,
Jean-Baptiste Vincent
(5)
1
OAPD -
INAF - Osservatorio Astronomico di Padova
2 IFN - CNR Institute for Photonics and Nanotechnologies
3 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
4 Dipartimento di Fisica e Astronomia "Galileo Galilei"
5 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
6 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
7 LAM - Laboratoire d'Astrophysique de Marseille
8 CAB - Centro de Astrobiologia [Madrid]
9 ISSI - International Space Science Institute [Bern]
10 ESTEC - European Space Research and Technology Centre
11 CBK - Space Research Centre of Polish Academy of Sciences
12 Department of Physics and Astronomy [Uppsala]
13 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
14 Department of Astronomy [College Park]
15 PLANETO - LATMOS
16 UNITN - Università degli Studi di Trento = University of Trento
17 Department of Industrial Engineering [Padova]
18 OAT - INAF - Osservatorio Astronomico di Trieste
19 IAA - Instituto de Astrofísica de Andalucía
20 DLR Institut für Planetenforschung
21 Institute of Space Science [Taiwan]
22 Operations Department (ESAC)
23 DEI - Department of Information Engineering [Padova]
24 Physikalisches Institut [Bern]
2 IFN - CNR Institute for Photonics and Nanotechnologies
3 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
4 Dipartimento di Fisica e Astronomia "Galileo Galilei"
5 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
6 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
7 LAM - Laboratoire d'Astrophysique de Marseille
8 CAB - Centro de Astrobiologia [Madrid]
9 ISSI - International Space Science Institute [Bern]
10 ESTEC - European Space Research and Technology Centre
11 CBK - Space Research Centre of Polish Academy of Sciences
12 Department of Physics and Astronomy [Uppsala]
13 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
14 Department of Astronomy [College Park]
15 PLANETO - LATMOS
16 UNITN - Università degli Studi di Trento = University of Trento
17 Department of Industrial Engineering [Padova]
18 OAT - INAF - Osservatorio Astronomico di Trieste
19 IAA - Instituto de Astrofísica de Andalucía
20 DLR Institut für Planetenforschung
21 Institute of Space Science [Taiwan]
22 Operations Department (ESAC)
23 DEI - Department of Information Engineering [Padova]
24 Physikalisches Institut [Bern]
Maurizio Pajola
- Fonction : Auteur
- PersonId : 987591
Nilda Oklay
- Fonction : Auteur
- PersonId : 976656
Sonia Fornasier
- Fonction : Auteur
- PersonId : 873258
Cesare Barbieri
- Fonction : Auteur
- PersonId : 757032
- ORCID : 0000-0002-6257-9076
Hans Rickman
- Fonction : Auteur
- PersonId : 880387
Horst U. Keller
- Fonction : Auteur
- PersonId : 970788
Jessica Agarwal
- Fonction : Auteur
- PersonId : 989052
Vania da Deppo
- Fonction : Auteur
- PersonId : 763247
- ORCID : 0000-0001-6273-8738
Wing-Huen Ip
- Fonction : Auteur
- PersonId : 770404
- ORCID : 0000-0001-5368-386X
Laurent Jorda
- Fonction : Auteur
- PersonId : 746464
- IdHAL : laurent-jorda
- ORCID : 0000-0001-8735-3308
- IdRef : 180975161
Jean-Baptiste Vincent
- Fonction : Auteur
- PersonId : 992874
Résumé
Multiple pairs of high-resolution images of the dust coma of comet 67P/Churyumov-Gerasimenko have been collected by OSIRIS onboard Rosetta allowing extraction and analysis of dust grain tracks. We developed a quasi automatic method to recognize and to extract dust tracks in the Osiris images providing size, FWHM and photometric data. The dust tracks characterized by a low signal-to-noise ratio were checked manually. We performed the photometric analysis of 70 dust grain tracks observed on two different Narrow Angle Camera images in the two filters F24 and F28, centered at lambda = 480.7 nm and at lambda = 743.7 nm, respectively, deriving the color and the reddening of each one. We then extracted several images of the nucleus observed with the same filters and with the same phase angle to be compared with the dust grain reddening. Most of the dust grain reddening is very similar to the nucleus values, confirming they come from the surface or subsurface layer. The histogram of the dust grain reddening has a secondary peak at negative values and shows some grains with values higher than the nucleus, suggesting a different composition from the surface grains. One hypothesis comes from the negative values point at the presence of hydrated minerals in the comet.
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