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Space weathering on dark asteroids

Moroz, L. V. (2005) Space weathering on dark asteroids. In: Geophysical Research Abstracts, 7, 09697-. 2nd General Assembly of the European Geosciences Union, 2005-04-25 - 2005-04-29, Vienna (Austria). ISSN 1607-7962

Full text not available from this repository.

Official URL: http://www.cosis.net/abstracts/EGU05/09697/EGU05-J-09697.pdf

Abstract

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 common 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.

Document Type:Conference or Workshop Item (Speech)
Title:Space weathering on dark asteroids
Authors:
AuthorsInstitution or Email of Authors
Moroz, L. V.UNSPECIFIED
Date:April 2005
Journal or Publication Title:Geophysical Research Abstracts
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:7
Page Range:09697-
ISSN:1607-7962
Status:Published
Keywords:asteroids, space weathering, optical properties, carbonization
Event Title:2nd General Assembly of the European Geosciences Union
Event Location:Vienna (Austria)
Event Type:international Conference
Event Dates:2005-04-25 - 2005-04-29
Organizer:European Geosciences Union
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 assignement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Dr. Liubov Moroz
Deposited On:03 Jan 2007
Last Modified:27 Apr 2009 13:21

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