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Space weathering of dark asteroids

Moroz, L. V. (2005) Space weathering of dark asteroids. In: Bulletin of the American Astronomical Society, 37 (3), p. 628. 37th Meeting of the Division of Planetary Sciences of the AAS, 2005-09-04 - 2005-09-09, Cambridge (UK).

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Space weathering - bombardment of airless bodies with charged particles and micrometeorites - may significantly modify optical properties of the uppermost layers of airless bodies. Silicate rocks dominate the surfaces of planets and small bodies in the inner solar system. Space weathering of Fe-containing silicate targets causes darkening and spectral reddening of their surfaces, induced mostly by reduction of Fe. However, effects of space weathering on surface properties of low-albedo small bodies are poorly understood. Such small bodies may contain organic materials which show very different space weathering trends. Recent experiments show that carbonization/polymerization of complex organics induced by space weathering may neutralize initially reddish spectral slopes of hydrocarbon-bearing targets. These new findings may explain, for example, unusual color-diameter trends observed within populations of low albedo outer belt asteroids (Cybeles, Hildas and Trojans). Furthermore, spectral differences between carbonaceous meteorites and the surfaces of dark main belt asteroids belonging to the C-complex were previously explained by extensive thermal metamorphism. Wide-spread metamorphism would imply the absence of soluble and insoluble organic materials on the surfaces and in the interiors of these asteroids. Alternatively, the observed spectral differences between primitive meteorites and C-asteroids can be explained by space weathering of their surfaces. In this case only surface layers would be affected by carbonization. The latter interpretation is supported by recently observed negative correlation between ages and average spectral slopes of C-complex asteroid families.

Item URL in elib:https://elib.dlr.de/46344/
Document Type:Conference or Workshop Item (Speech)
Title:Space weathering of dark asteroids
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:September 2005
Journal or Publication Title:Bulletin of the American Astronomical Society
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:p. 628
Keywords:asteroids, space weathering, optical properties
Event Title:37th Meeting of the Division of Planetary Sciences of the AAS
Event Location:Cambridge (UK)
Event Type:international Conference
Event Dates:2005-09-04 - 2005-09-09
Organizer:Division of PLanetary Sciences of the AAS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - no assignment (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Moroz, Dr. Liubov
Deposited On:03 Jan 2007
Last Modified:27 Apr 2009 13:21

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