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The thermal inertia of near-Earth asteroids: Implications for their surface structure and the Yarkovsky effect

Delbo, Marco and Dell'Oro, A. and Harris, Alan W. and Mottola, Stefano and Mueller, Michael (2005) The thermal inertia of near-Earth asteroids: Implications for their surface structure and the Yarkovsky effect. IAU Symposium No 229; ACM 2005, 2005-08-07 - 2005-08-12, Buzios, RJ (Brasilien). (Unpublished)

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Official URL: http://www.on.br/acm2005/visualiza-abstract.php?acao=The+thermal+inertia+of+near-Earth+asteroids%3A+implications+for+their+surface+structure+and+the+Yarkovsky+effect

Abstract

We have used a new method to analyze the largest available database of thermal- infrared observations of near-Earth asteroids (NEAs) in order to constrain their thermal inertia. We have obtained a best fit value of 500+/-100 J m-2 s-0.5 K-1, or about 10 times that of the lunar soil. Our estimate is significantly larger than the value commonly used in the Yarkovsky model of the origin of NEAs. The value of the thermal inertia is one of the major sources of uncertainty in the collision probability prediction of potentially hazardous NEAs, such as 1950 DA. The value of thermal inertia that we have derived is incompatible with surfaces dominated by bare rock for these bodies.

Document Type:Conference or Workshop Item (Speech)
Title:The thermal inertia of near-Earth asteroids: Implications for their surface structure and the Yarkovsky effect
Authors:
AuthorsInstitution or Email of Authors
Delbo, MarcoINAF, Turin, Italien
Dell'Oro, A.INAF, Turin, Italien
Harris, Alan W.UNSPECIFIED
Mottola, StefanoUNSPECIFIED
Mueller, MichaelUNSPECIFIED
Date:August 2005
Status:Unpublished
Keywords:asteroids
Event Title:IAU Symposium No 229; ACM 2005
Event Location:Buzios, RJ (Brasilien)
Event Type:international Conference
Event Dates:2005-08-07 - 2005-08-12
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:01 Mar 2006
Last Modified:27 Apr 2009 04:57

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