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The Surface Properties of Small Asteroids from Thermal-Infrared Observations

Harris, Alan (2006) The Surface Properties of Small Asteroids from Thermal-Infrared Observations. In: Asteroids, Comets and Meteors (1 - Symposium S229). Cambridge University Press. Asteroids, Comets, Meteors 2005, 2005-08-07 - 2005-08-12, Buzios, Rio de Janeiro (Brazil). ISBN 10 0521 85200 5 ISSN 1743-9213

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Offizielle URL: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=414794#


While the physical characterization of near-Earth objects (NEOs) is progressing at a much slower rate than that of discovery, a substantial body of thermal-infrared data has been gathered over the past few years. A wide variety of taxonomic classes in the NEO population have now been sampled by means of thermal-infrared spectrophotometric observations. The resulting albedo information, together with the distribution of taxonomic types from spectroscopic investigations and the rapidly increasing catalog of orbits and absolute magnitudes derived from NEO search programs, such as LINEAR, facilitates more accurate estimates of the size distribution of the NEO population and the magnitude of the impact hazard. Despite our rapidly increasing knowledge of the NEO population, many questions and uncertainties remain, such as: How does the albedo distribution of NEOs compare with that of main-belt asteroids, and does space weathering play a role? How does the surface structure and regolith coverage of NEOs vary with size and taxonomic type? What fraction of NEOs are extinct comets? A property of particular interest is the surface thermal inertia of small asteroids, which is an indicator of the presence or lack of a thermally-insulating surface layer. Large asteroids can accumulate regolith, but can very small asteroids retain thermally-insulating collisional debris or at least a dust layer? Knowledge of thermal inertia is important for accurate calculations of the Yarkovsky effect, which can significantly influence the orbital evolution of potentially hazardous NEOs, and for the design of instruments for lander missions. Contrary to earlier expectations, evidence appears to be accumulating that even sub-kilometer asteroids often have a significant thermally-insulating surface layer. Recent results from thermal-infrared investigations of NEOs are reviewed and implications for the surface properties of small asteroids discussed.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen:doi:10.1017/S1743921305006915
Titel:The Surface Properties of Small Asteroids from Thermal-Infrared Observations
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Erschienen in:Asteroids, Comets and Meteors
Referierte Publikation:Ja
In Open Access:Nein
In ISI Web of Science:Nein
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Verlag:Cambridge University Press
Name der Reihe:Proceedings of the International Astronomical Union
ISBN:10 0521 85200 5
Stichwörter:Asteroids, Near-Earth Objects, Physical Properties
Veranstaltungstitel:Asteroids, Comets, Meteors 2005
Veranstaltungsort:Buzios, Rio de Janeiro (Brazil)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-08-07 - 2005-08-12
Veranstalter :International Astronomical Union
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:13 Nov 2006
Letzte Änderung:27 Apr 2009 13:11

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