Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images

被引：142

作者：

El-Maarry, M. R. ^{[1
]}

Thomas, N. ^{[1
]}

Giacomini, L. ^{[2
]}

Massironi, M. ^{[2
]}

Pajola, M. ^{[3
]}

Marschall, R. ^{[1
]}

Gracia-Berna, A. ^{[1
]}

Sierks, H. ^{[4
]}

Barbieri, C. ^{[5
]}

Lamy, P. L. ^{[6
]}

Rodrigo, R. ^{[7
,8
]}

Rickman, H. ^{[9
,10
]}

Koschny, D. ^{[11
]}

Keller, H. U. ^{[12
]}

Agarwal, J. ^{[4
]}

A'Hearn, M. F. ^{[13
]}

Auger, A. -T. ^{[6
]}

Barucci, M. A. ^{[14
]}

Bertaux, J. -L. ^{[15
]}

Bertini, I. ^{[3
]}

Besse, S. ^{[11
]}

Bodewits, D. ^{[13
]}

Cremonese, G. ^{[5
]}

Da Deppo, V. ^{[16
]}

Davidsson, B. ^{[17
]}

De Cecco, M. ^{[18
]}

Debei, S. ^{[19
]}

Guettler, C. ^{[4
]}

Fornasier, S. ^{[15
]}

Fulle, M. ^{[20
]}

Groussin, O. ^{[6
]}

Gutierrez, P. J. ^{[21
]}

Hviid, S. F. ^{[22
]}

Ip, W. -H. ^{[23
]}

Jorda, L. ^{[24
]}

Knollenberg, J. ^{[22
]}

Kovacs, G. ^{[4
]}

Kramm, J. -R. ^{[4
]}

Kuehrt, E. ^{[22
]}

Kueppers, M. ^{[25
]}

La Forgia, F. ^{[5
]}

Lara, L. M. ^{[21
]}

Lazzarin, M. ^{[5
]}

Lopez Moreno, J. J. ^{[21
]}

Marchi, S. ^{[26
]}

Marzari, F. ^{[5
]}

Michalik, H. ^{[27
]}

Naletto, G. ^{[3
,16
,28
]}

Oklay, N. ^{[4
]}

Pommerol, A. ^{[1
]}

机构：

[1] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland

[2] Univ Padua, Dipartimento Geosci, I-35131 Padua, Italy

[3] Univ Padua, Ctr Ateneo Studi & Att Spaziali Giuseppe Colombo, I-35122 Padua, Italy

[4] Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany

[5] INAF 78Osservatorio Astron, I-35122 Padua, Italy

[6] Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France

[7] Int Space Sci Inst, CH-3012 Bern, Switzerland

[8] CSIC INTA, Ctr Astrobiol, Madrid 28850, Spain

[9] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[10] PAS Space Res Ctr, PL-00716 Warsaw, Poland

[11] European Space Agcy, Sci Support Off, NL-2201 Noordwijk, Netherlands

[12] Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany

[13] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[14] Univ Paris Diderot, Univ Paris 06, Observ Paris, LESIA,CNRS, F-92195 Meudon, France

[15] CNRS UVSQ IPSL, LATMOS, F-78280 Guyancourt, France

[16] CNR IFN UOS Padova LUXOR, I-35131 Padua, Italy

[17] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[18] Univ Trento, UNITN, I-38100 Trento, Italy

[19] Univ Padua, Dept Mech Engn, I-35131 Padua, Italy

[20] INAF Osservatorio Astron, I-34014 Trieste, Italy

[21] Inst Astrofis Andalucia CSIC, Granada 18008, Spain

[22] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany

[23] Natl Cent Univ, Grad Inst Astron, Chungli 32054, Taiwan

[24] Lab Astrophys Marseille, F-13388 Marseille 13, France

[25] European Space Astron Ctr ESA, Sci Support Off, Madrid 28691, Spain

[26] SW Res Inst, Solar Syst Explorat Res Virtual Inst, Boulder, CO 80302 USA

[27] Tech Univ Carolo Wilhelmina Braunschweig, Inst Datentech & Kommunikat Netze, D-38106 Braunschweig, Germany

[28] Univ Padua, Dept Informat Engn, I-35131 Padua, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 583卷

关键词：

comets: general; comets: individual: 67P/Churyumov-Gerasimenko; methods: observational; JUPITER FAMILY COMETS; OSIRIS; GEOMORPHOLOGY; NUCLEUS;

D O I：

10.1051/0004-6361/201525723

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)'s nucleus at spatial resolutions down to similar to 0.17 m/px ever since Aug. 2014. These images have yielded unprecedented insight into the morphological diversity of the comet's surface. This paper presents an overview of the regional morphology of comet 67P. Methods. We used the images that were acquired at orbits similar to 20-30 km from the center of the comet to distinguish different regions on the surface and introduce the basic regional nomenclature adopted by all papers in this Rosetta special feature that address the comet's morphology and surface processes. We used anaglyphs to detect subtle regional and topographical boundaries and images from close orbit (similar to 10 km from the comet's center) to investigate the fine texture of the surface. Results. Nineteen regions have currently been defined on the nucleus based on morphological and/or structural boundaries, and they can be grouped into distinctive region types. Consolidated, fractured regions are the most common region type. Some of these regions enclose smooth units that appear to settle in gravitational sinks or topographically low areas. Both comet lobes have a significant portion of their surface covered by a dusty coating that appears to be recently placed and shows signs of mobilization by aeolian-like processes. The dusty coatings cover most of the regions on the surface but are notably absent from a couple of irregular large depressions that show sharp contacts with their surroundings and talus-like deposits in their interiors, which suggests that short-term explosive activity may play a significant role in shaping the comet's surface in addition to long-term sublimation loss. Finally, the presence of layered brittle units showing signs of mechanical failure predominantly in one of the comet's lobes can indicate a compositional heterogeneity between the two lobes.

引用

页数：28

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