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Asteroid Compositional Information from Thermal-Infrared Observations

Harris, Alan (2006) Asteroid Compositional Information from Thermal-Infrared Observations. AOGS 2006 (Asia Oceania Geosciences Society's 3rd Annual Meeting), 2006-07-10 – 2006-07-14, Singapore.

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Abstract

Thermal-infrared observations are the main source of information on asteroid sizes and albedos. In many cases reflection spectra alone provide ambiguous information on asteroid mineralogy; albedos are required to remove the spectral degeneracy between classes such as E, M and P. Albedo measurements are also important for the identification of objects that may be dormant or extinct comets. A phenomenon that can complicate the mineralogical analysis of reflection spectra is space weathering. Recent thermal-infrared observations of near-Earth asteroids have provided evidence for a dependence of space weathering on size, and may provide valuable information on the timescale of space weathering. Values of thermal inertia, which is determined by the degree to which an asteroid’s surface is covered in thermally-insulating, dusty material, have recently been derived for a few objects from extensive thermal-infrared observations and sophisticated thermophysical modeling. Does thermal inertia depend on composition and size? The importance of thermal-infrared observations for investigations of asteroid mineralogy, space-weathering effects, and surface properties, will be reviewed.

Document Type:Conference or Workshop Item (Speech)
Title:Asteroid Compositional Information from Thermal-Infrared Observations
Authors:
AuthorsInstitution or Email of Authors
Harris, AlanUNSPECIFIED
Date:August 2006
Status:Published
Keywords:Asteroids, Thermal-infrared observations, Composition, Space weathering, Thermal inertia
Event Title:AOGS 2006 (Asia Oceania Geosciences Society's 3rd Annual Meeting)
Event Location:Singapore
Event Type:international Conference
Event Dates:2006-07-10 – 2006-07-14
Organizer:Asia Oceania Geosciences Society
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 - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research
Deposited By: Prof. Alan Harris
Deposited On:10 Oct 2006
Last Modified:27 Apr 2009 13:04

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