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

Delbo, Marco und Dell'Oro, Aldo und Harris, Alan und Mottola, Stefano und 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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Thermal Inertia of near-Earth Asteroids and Strength of the Yarkovsky Effect
AutorenInstitution oder E-Mail-Adresse der Autoren
Delbo, MarcoObservatoire de la Cote d'Azur, France
Dell'Oro, AldoINAF-Astronomical Observatory of Turin, Italy
Datum:Oktober 2006
Erschienen in:Bulletin of the American Astronomical Society
Referierte Publikation:Nein
In ISI Web of Science:Nein
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
American Astronomical Society, NICHT SPEZIFIZIERT
Verlag:American Astronomical Society
Stichwörter:Asteroids, near-Earth asteroids, infrared observations, thermal models
Veranstaltungstitel:38th DPS-Meeting of the American Astronomical Society
Veranstaltungsort:Pasadena, California, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-10-8 - 2006-10-13
Veranstalter :AAS Division for Planetary Sciences
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Institut für Planetenforschung
Hinterlegt von: Prof. Alan Harris
Hinterlegt am:25 Okt 2006
Letzte Änderung:27 Apr 2009 13:04

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