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Aswan site on comet 67P/Churyumov-Gerasimenko : Morphology, boulder evolution, and spectrophotometry

Pajola, Maurizio (författare)
G Colombo Univ Padova, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy.;NASA, Ames Res Ctr, Moffett Field, CA 94035 USA.
Oklay, Nilda (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
La Forgia, Fiorangela (författare)
G Galilei Univ Padova, Dept Phys & Astron, Vic Osservatorio 3, I-35122 Padua, Italy.
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Giacomini, Lorenza (författare)
Univ Padua, Geosci Dept, Via G Gradenigo 6, I-35131 Padua, Italy.
Massironi, Matteo (författare)
Univ Padua, Geosci Dept, Via G Gradenigo 6, I-35131 Padua, Italy.
Bertini, Ivano (författare)
G Colombo Univ Padova, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy.
El-Maarry, M. R. (författare)
Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland.
Marzari, Francesco (författare)
G Galilei Univ Padova, Dept Phys & Astron, Vic Osservatorio 3, I-35122 Padua, Italy.
Preusker, Frank (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany.
Scholten, Frank (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany.
Hoefner, Sebastian (författare)
Lee, Jui-Chi (författare)
Natl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan.
Vincent, Jean-Baptiste (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
Groussin, Olivier (författare)
Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France.
Naletto, Giampiero (författare)
Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy.;CNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy.
Lazzarin, Monica (författare)
G Galilei Univ Padova, Dept Phys & Astron, Vic Osservatorio 3, I-35122 Padua, Italy.
Barbieri, Cesare (författare)
G Galilei Univ Padova, Dept Phys & Astron, Vic Osservatorio 3, I-35122 Padua, Italy.
Sierks, Holger (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
Lamy, Philippe (författare)
Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France.
Rodrigo, Rafael (författare)
CSIC INTA, Ctr Astrobiol, Madrid 28850, Spain.;Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland.
Koschny, Detlef (författare)
European Space Res & Technol Ctr ESA, Sci Support Off, Keplerlaan 1,Postbus 299, NL-2201 AZ Noordwijk, Netherlands.
Rickman, Hans (författare)
Uppsala universitet,Teoretisk astrofysik,PAS Space Reserch Ctr, Bartycka 18A, PL-00716 Warsaw, Poland.
Keller, Horst U. (författare)
TU Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.
Agarwal, Jessica (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
A'Hearn, Michael F. (författare)
Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
Barucci, Maria A. (författare)
Univ Paris 06, Univ Paris Diderot, CNRS, LESIA Observ Paris, 5 Pl J Janssen, F-92195 Meudon, France.;Univ Paris Diderot, Sorbonne Paris Cite, 4 Rue Elsa Morante, F-75205 Paris 13, France.
Bertaux, Jean-Loup (författare)
CNRS UVSQ IPSL, LATMOS, 11 Blvd Alembert, F-78280 Guyancourt, France.
Cremonese, Gabriele (författare)
INAF Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy.
Da Deppoll, Vania (författare)
CNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy.
Davidsson, Bjoern (författare)
NASA, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA.
De Cecco, Mariolino (författare)
Univ Trento, UNITN, Via Mesiano 77, I-38100 Trento, Italy.
Debei, Stefano (författare)
Univ Padua, Dept Mech Engn, Via Venezia 1, I-35131 Padua, Italy.
Ferri, Francesca (författare)
G Colombo Univ Padova, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy.
Fornasier, Sonia (författare)
Fulle, Marco (författare)
INAF Osservatorio Astron Trieste, Via Tiepolo 11, I-34143 Trieste, Italy.
Guettler, Carsten (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
Gutierrez, Pedro J. (författare)
CSIC, Inst Astrofis Andalucia, Glorieta Astron, E-18008 Granada, Spain.
Hviid, Stubbe F. (författare)
Ip, Wing-Huen (författare)
Jorda, Laurent (författare)
Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France.
Knollenberg, Joerg (författare)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany.
Kramm, J. -Rainer (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
Kueppers, Michael (författare)
ESA, European Space Astron Ctr, Operat Dept, POB 78, Madrid 28691, Spain.
Kuert, Ekkehard (författare)
Lara, Luisa M. (författare)
CSIC, Inst Astrofis Andalucia, Glorieta Astron, E-18008 Granada, Spain.
Lin, Zhong-Yi (författare)
Natl Cent Univ, Inst Space Sci, Chungli 32054, Taiwan.
Moreno, Jose J. Lopez (författare)
CSIC, Inst Astrofis Andalucia, Glorieta Astron, E-18008 Granada, Spain.
Magrin, Sara (författare)
G Galilei Univ Padova, Dept Phys & Astron, Vic Osservatorio 3, I-35122 Padua, Italy.
Michalik, Harald (författare)
TU Braunschweig, Inst Datentech & Kommunikationsnetze, Hans Sommer Str 66, D-38106 Braunschweig, Germany.
Mottola, Stefano (författare)
Thomas, Nicholas (författare)
Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland.
Tubiana, Cecilia (författare)
Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany.
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G Colombo Univ Padova, CISAS, Ctr Studies & Act Space, Via Venezia 15, I-35131 Padua, Italy;NASA, Ames Res Ctr, Moffett Field, CA 94035 USA. Max Planck Inst Sonnensyst Forsch, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany. (creator_code:org_t)
2016-07-28
2016
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 592
Relaterad länk:
https://www.aanda.or...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Aims. We provide a detailed morphological analysis of the Aswan site on comet 67P/Churyumov-Gerasimenko (67P). We derive the size-frequency distribution of boulders >= 2 m and correlate this distribution with the gravitational slopes for the first time on a comet. We perform the spectral analysis of this region to understand if possible surface variegation is related to the different surface textures observable on the different units. Methods. We used two OSIRIS Narrow Angle Camera (NAC) image data sets acquired on September 19 and 22, 2014, with a scale of 0.5 m/px. Gravitational slopes derived from the 3D shape model of 67P were used to identify and interpret the different units of the site. By means of the high-resolution NAC data sets, boulders >= 2.0 m can be unambiguously identified and extracted using the software ArcGIS. Coregistered and photometrically corrected color cubes were used to perform the spectral analyses, and we retrieved the spectral properties of the Aswan units. Results. The high-resolution morphological map of the Aswan site (0.68 km(2)) shows that this site is characterized by four different units: fine-particle deposits located on layered terrains, gravitational accumulation deposits, taluses, and the outcropping layered terrain. Multiple lineaments are identified on the Aswan cliff, such as fractures, exposed layered outcrops, niches, and terraces. Close to the terrace margin, several arched features observed in plan view suggest that the margin progressively retreats as a result of erosion. The size-frequency of boulders >= 2 m in the entire study area has a power-law index of -3.9 +0.2/-0.3 (1499 boulders >= 2 m/km(2)), suggesting that the Aswan site is mainly dominated by gravitational events triggered by sublimation and/or thermal insolation weathering causing regressive erosion. The boulder size-frequency distribution versus gravitational slopes indicates that when higher gravitational slope terrains are considered, only boulders <= 10 m are identified, as well as steeper power-slope indices. In addition, no boulders >= 2 m are observed on slopes >= 50 degrees. This may indicate that larger blocks detached from a sublimating cliff cannot rest at these slopes and consequently fall down. The spectral analysis performed on the site shows that despite different morphologic units, no spectral differences appear in the multiple textures. This may confirm a redistribution of particles across the nucleus as a consequence of airfall, whether coming from Hapi or from the southern hemisphere when it is active during perihelion.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

comets: general
comets: individual: 67P/Churyumov-Gerasimenko
methods: data analysis

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ref (ämneskategori)
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