Issue |
A&A
Volume 583, November 2015
Rosetta mission results pre-perihelion
|
|
---|---|---|
Article Number | A45 | |
Number of page(s) | 12 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201525994 | |
Published online | 30 October 2015 |
Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko⋆
1
Max-Planck-Institut für Sonnensystemforschung,
Justus-von-Liebig-Weg 3,
37077
Göttingen,
Germany
e-mail:
oklay@mps.mpg.de
2
Research and Scientific Support Department,
European Space Agency,
2201
Noordwijk, The
Netherlands
3
Center of Studies and Activities for Space, CISAS, “G. Colombo”,
University of Padova, via Venezia
15, 35131
Padova,
Italy
4
PAS Space Research Center, Bartycka 18A,
00-716
Warszawa,
Poland
5
Department of Physics & Astronomy, Uppsala
University, Box 516 75120,
Uppsala,
Sweden
6
Dipartimento di Fisica e Astronomia “Galileo Galilei”, University
of Padova, vic. Osservatorio
3, 35122
Padova,
Italy
7
LESIA, Observatoire de Paris, CNRS, UPMC Université Paris 06,
Université Paris-Diderot, 5 place
J. Janssen, 92195
Meudon Principal Cedex,
France
8
Université Paris-Diderot, Sorbonne Paris Cité, 4 rue Elsa Morante,
75205
Paris Cedex 13,
France
9
Aix Marseille Université, CNRS, LAM (Laboratoire d’Astro-physique
de Marseille) UMR 7326, 13388
Marseille,
France
10
Centro de Astrobiologia (INTA-CSIC), European Space Agency (ESA),
European Space Astronomy Centre (ESAC), PO Box 78, 28691 Villanueva de la Canada,
Madrid,
Spain
11
International Space Science Institute,
Hallerstrasse 6,
3012
Bern,
Switzerland
12
Department for Astronomy, University of Maryland,
College Park, MD
20742-2421,
USA
13
LATMOS, CNRS/UVSQ/IPSL, 11 boulevard d’Alembert, 78280
Guyancourt,
France
14
INAF Osservatorio Astronomico di Padova, vic. dell’Osservatorio 5,
35122
Padova,
Italy
15
CNR-IFN UOS Padova LUXOR, via Trasea 7,
35131
Padova,
Italy
16
Department of Industrial Engineering, University of
Padova, via Venezia
1, 35131
Padova,
Italy
17
University of Trento, via Sommarive 9, 38123
Trento,
Italy
18
INAF Osservatorio Astronomico di Trieste, via Tiepolo 11,
34014
Trieste,
Italy
19
Instituto de Astrofisica de Andalucia-CSIC,
Glorieta de la
Astronomia, 18008
Granada,
Spain
20
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für
Planetenforschung, Rutherfordstraße
2, 12489
Berlin,
Germany
21
Graduate Institute of Astronomy, National Central University,
300 Chung-Da Rd,
32054
Chung-Li,
Taiwan
22
Institut für Geophysik und extraterrestrische Physik,
TU Braunschweig,
38106
Braunschweig,
Germany
23
Operations Department European Space Astronomy Centre ESA,
PO Box 78, 28691 Villanueva de la
Cañada, Madrid,
Spain
24
Institut für Datentechnik und Kommunikationsnetze der TU
Braunschweig, Hans-Sommer-Str.
66, 38106
Braunschweig,
Germany
25
Department of Information Engineering, University of
Padova, via Gradenigo
6/B, 35131
Padova,
Italy
26
Physikalisches Institut, Sidlerstrasse 5, University of Bern,
3012
Bern,
Switzerland
Received: 28 February 2015
Accepted: 29 August 2015
Context. We interpret multicolor data from OSIRISNAC for the remote-sensing exploration of comet 67P/Churyumov-Gerasimenko.
Aims. We determine the most meaningful definition of color maps for the characterization of surface variegation with filters available on OSIRIS NAC.
Methods. We analyzed laboratory spectra of selected minerals and olivine-pyroxene mixtures seen through OSIRIS NAC filters, with spectral methods existing in the literature: reflectance ratios, minimum band wavelength, spectral slopes, band tilt, band curvature, and visible tilt.
Results. We emphasize the importance of reflectance ratios and particularly the relation of visible tilt vs. band tilt. This technique provides a reliable diagnostic of the presence of silicates. Color maps constructed by red-green-blue colors defined with the green, orange, red, IR, and Fe2O3 filters let us define regions that may significantly differ in composition.
Key words: comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis / techniques: imaging spectroscopy
Appendices are available in electronic form at http://www.aanda.org
© ESO, 2015
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