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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26095
Title: Aswan site on comet 67P/Churyumov-Gerasimenko: Morphology, boulder evolution, and spectrophotometry
Authors: PAJOLA, MAURIZIO 
Oklay, Nilda
La Forgia, Fiorangela
GIACOMINI, LORENZA 
MASSIRONI, MATTEO
BERTINI, IVANO
El-Maarry, M. R.
MARZARI, FRANCESCO
Preusker, Frank
Scholten, Frank
Höfner, Sebastian
Lee, Jui-Chi
Vincent, Jean-Baptiste
Groussin, Olivier
Naletto, Giampiero
Lazzarin, Monica
Barbieri, Cesare
Sierks, Holger
Lamy, Philippe
Rodrigo, Rafael
Koschny, Detlef
Rickman, Hans
Keller, Horst U.
Agarwal, Jessica
A'Hearn, Michael F.
Barucci, Maria A.
Bertaux, Jean-Loup
CREMONESE, Gabriele 
Da Deppo, Vania
Davidsson, Björn
De Cecco, Mariolino
Debei, Stefano
Ferri, Francesca
FORNASIER, SONIA
FULLE, Marco 
Güttler, Carsten
Gutierrez, Pedro J.
Hviid, Stubbe F.
Ip, Wing-Huen
Jorda, Laurent
Knollenberg, Jörg
Kramm, J. -Rainer
Küppers, Michael
Kürt, Ekkehard
Lara, Luisa M.
Lin, Zhong-Yi
Lopez Moreno, Jose J.
Magrin, Sara
Michalik, Harald
Mottola, Stefano
Thomas, Nicholas
Tubiana, Cecilia
Issue Date: 2016
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 592
First Page: A69
Abstract: 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 thedifferent surface textures observable on the different units. <BR /> 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. <BR /> Results: The high-resolution morphological map of the Aswan site (0.68 km<SUP>2</SUP>) 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<SUP>2</SUP>), 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°. 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.
URI: http://hdl.handle.net/20.500.12386/26095
URL: https://www.aanda.org/articles/aa/abs/2016/08/aa27865-15/aa27865-15.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201527865
Bibcode ADS: 2016A&A...592A..69P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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