DOI: 10.1002/2015GL064500
论文题名: Fractures on comet 67P/Churyumov-Gerasimenko observed by Rosetta/OSIRIS
作者: El-Maarry M.R. ; Thomas N. ; Gracia-Berná A. ; Marschall R. ; Auger A.-T. ; Groussin O. ; Mottola S. ; Pajola M. ; Massironi M. ; Marchi S. ; Höfner S. ; Preusker F. ; Scholten F. ; Jorda L. ; Kührt E. ; Keller H.U. ; Sierks H. ; A'Hearn M.F. ; Barbieri C. ; Barucci M.A. ; Bertaux J.-L. ; Bertini I. ; Cremonese G. ; Da Deppo V. ; Davidsson B. ; Debei S. ; De Cecco M. ; Deller J. ; Güttler C. ; Fornasier S. ; Fulle M. ; Gutierrez P.J. ; Hofmann M. ; Hviid S.F. ; Ip W.-H. ; Knollenberg J. ; Koschny D. ; Kovacs G. ; Kramm J.-R. ; Küppers M. ; Lamy P.L. ; Lara L.M. ; Lazzarin M. ; Lopez Moreno J.J. ; Marzari F. ; Michalik H. ; Naletto G. ; Oklay N. ; Pommerol A. ; Rickman H. ; Rodrigo R. ; Tubiana C. ; Vincent J.-B.
刊名: Geophysical Research Letters
ISSN: 0094-9158
EISSN: 1944-8889
出版年: 2015
卷: 42, 期: 13 起始页码: 5170
结束页码: 5178
语种: 英语
英文关键词: Comet 67P
; comets
; fractures
; OSIRIS
; Rosetta
Scopus关键词: Fracture
; Orbits
; Topology
; Weathering
; 67p/churyumov-gerasimenko
; Comet 67P
; Comets
; Diurnal temperature ranges
; OSIRIS
; Regional distribution
; Rosetta
; Thermal contraction
; Thermal insulation
; comet
; OSIRIS
; spacecraft
; temperature gradient
; typology
英文摘要: The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) experiment onboard the Rosetta spacecraft currently orbiting comet 67P/Churyumov-Gerasimenko has yielded unprecedented views of a comet's nucleus. We present here the first ever observations of meter-scale fractures on the surface of a comet. Some of these fractures form polygonal networks. We present an initial assessment of their morphology, topology, and regional distribution. Fractures are ubiquitous on the surface of the comet's nucleus. Furthermore, they occur in various settings and show different topologies suggesting numerous formation mechanisms, which include thermal insulation weathering, orbital-induced stresses, and possibly seasonal thermal contraction. However, we conclude that thermal insolation weathering is responsible for creating most of the observed fractures based on their morphology and setting in addition to thermal models that indicate diurnal temperature ranges exceeding 200K and thermal gradients of ∼15K/min at perihelion are possible. Finally, we suggest that fractures could be a facilitator in surface evolution and long-term erosion. Key Points Fractures are observed on the surface of a comet for the first time Different fracture settings and topologies suggest various formation mechanisms Fractures may be a key driver in the evolution of the surface. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938215726&doi=10.1002%2f2015GL064500&partnerID=40&md5=daae4bde02a9170b2dc769813adf5c64
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8774
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Physikalisches Institut, University of Bern, Bern, Switzerland
Recommended Citation:
El-Maarry M.R.,Thomas N.,Gracia-Berná A.,et al. Fractures on comet 67P/Churyumov-Gerasimenko observed by Rosetta/OSIRIS[J]. Geophysical Research Letters,2015-01-01,42(13).