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Thermal Inertia of near-Earth Asteroids and Strength of the Yarkovsky Effect

Delbo, Marco and Dell'Oro, Aldo and Harris, Alan and Mottola, Stefano and Mueller, Michael (2006) Thermal Inertia of near-Earth Asteroids and Strength of the Yarkovsky Effect. In: Bulletin of the American Astronomical Society, 38 (53.04). American Astronomical Society. 38th DPS-Meeting of the American Astronomical Society, 2006-10-8 - 2006-10-13, Pasadena, California, USA.

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Thermal inertia is the physical parameter that controls the temperature distribution over the surface of an asteroid. It affects the strength of the Yarkovsky effect, which causes orbital drift of km-sized asteroids and is invoked to explain the delivery of near-Earth asteroids (NEAs) from the main belt. Moreover, measurements of thermal inertia provide information on the presence or absence of loose surface material, such as thermally insulating regolith or dust. At present, very little is known about the thermal inertia of asteroids in the km size range. Using an extensive dataset of thermal infrared observations obtained at the Keck 1, the ESO 3.6m and the IRTF telescopes, we find that the mean thermal inertia of near-Earth asteroids in the km-size range is 200 ± 50 J m<sup>-2</sup> s<sup>-0.5</sup> K<sup>-1</sup> corresponding to a surface thermal conductivity of 0.03 ± 0.01 W m<sup>-1</sup>K<sup>-1</sup>. Combining this result with published values of asteroid thermal inertias, we also identify a trend of increasing thermal inertia with decreasing asteroid size. As a consequence, the dependence of the Yarkovsky-induced semimajor axis drift rate on object diameter, D, departs from the 1/D dependence commonly assumed in models of the dynamical evolution of asteroids.

Item URL in elib:https://elib.dlr.de/44752/
Document Type:Conference or Workshop Item (Speech)
Title:Thermal Inertia of near-Earth Asteroids and Strength of the Yarkovsky Effect
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Delbo, MarcoObservatoire de la Cote d'Azur, FranceUNSPECIFIEDUNSPECIFIED
Dell'Oro, AldoINAF-Astronomical Observatory of Turin, ItalyUNSPECIFIEDUNSPECIFIED
Date:October 2006
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
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:American Astronomical Society
Keywords:Asteroids, near-Earth asteroids, infrared observations, thermal models
Event Title:38th DPS-Meeting of the American Astronomical Society
Event Location:Pasadena, California, USA
Event Type:international Conference
Event Dates:2006-10-8 - 2006-10-13
Organizer:AAS Division for Planetary Sciences
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: Harris, Prof. Alan
Deposited On:25 Oct 2006
Last Modified:27 Apr 2009 13:04

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