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Thermal Inertia of Near-Earth Asteroids and Magnitude 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 Magnitude of the Yarkovsky Effect. European Planetary Science Congress 2006, 2006-09-18 - 2006-09-22, Berlin, Germany.

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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. Measurements of thermal inertia provide information on the presence or absence of loose surface material, such as thermally insulating regolith or dust. Such information is not only important for scientific studies of asteroid surface properties, but it is also vital for the design of lander missions and in the development of technology for the deflection of hazardous asteroids. At present, very little is known about the thermal inertia of asteroids in the km size range. Here we report on a method that has allowed us to derive a mean value for the thermal inertia of near-Earth asteroids on the basis of multi-wavelength thermal-infrared observations. We obtain a mean value of 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>. 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 Magnitude of the Yarkovsky Effect
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Delbo, MarcoObservatoire de la Côte d’Azur, FranceNICHT SPEZIFIZIERT
dell'Oro, AldoINAF-Osservatorio Astr. di Torino, ItalyNICHT SPEZIFIZIERT
Datum:September 2006
Referierte Publikation:Nein
In Open Access:Nein
In ISI Web of Science:Nein
Stichwörter:Asteroids, near-Earth asteroids, infrared observations, thermal models
Veranstaltungstitel:European Planetary Science Congress 2006
Veranstaltungsort:Berlin, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-09-18 - 2006-09-22
Veranstalter :Europlanet - European Planetology Network
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: Harris, Prof. Alan
Hinterlegt am:25 Okt 2006
Letzte Änderung:27 Apr 2009 13:04

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