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Indications for Regolith on Itokawa from Thermal-Infrared Observations

Mueller, Michael and Delbo, Marco and di Martino, Mario and Harris, Alan W. and Kaasalainen, Mikko and Bus, Schelte J. (2004) Indications for Regolith on Itokawa from Thermal-Infrared Observations. The first Hayabusa Symposium, 2004-10-20 - 2004-10-24, Sagamihara, Kanagawa, Japan. (Unpublished)

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We report preliminary results of thermal-infrared observations of the near-Earth asteroid (25143) Itokawa made with the ESO 3.6m telescope in 2001 and the NASA IRTF in 2004. Using these and data from the literature we investigated the size and thermal properties of Itokawa. We were not able to obtain an un-ambiguous result for Itokawa’s size but we could reliably constrain the thermal properties of the surface. We use a detailed thermophysical model accounting explicitly for Itokawa’s shape and spin state, heat conduction, and surface roughness. Our results indicate that Itokawa’s surface is dominated by regolith rather than by bare rock; a surface of bare rock only is ruled out, although boulders covering a moderate percentage of the surface are not excluded.

Document Type:Conference or Workshop Item (Speech)
Title:Indications for Regolith on Itokawa from Thermal-Infrared Observations
AuthorsInstitution or Email of Authors
Mueller, MichaelUNSPECIFIED
Delbo, MarcoINAF, Turin, Italien
di Martino, MarioINAF, Turin, Italien
Kaasalainen, MikkoUniversität Helsinki, Rolf-Nevanlinna-Institut
Bus, Schelte J.University of Hawaii
Date:December 2004
Event Title:The first Hayabusa Symposium
Event Location:Sagamihara, Kanagawa, Japan
Event Type:international Conference
Event Dates:2004-10-20 - 2004-10-24
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
Deposited By: Michael Müller
Deposited On:13 Jul 2007
Last Modified:14 Jan 2010 23:18

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