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The Relevance of Thermal Inertia to Planetary Defense

Harris, Alan und Drube, Line (2017) The Relevance of Thermal Inertia to Planetary Defense. Planetary Defence Conference 2017, 15-19 May 2017, Tokyo, Japan.

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Kurzfassung

One of the largest uncertainties in the outcome of an attempt to deflect an asteroid with a kinetic impactor is the momentum enhancement factor, β, which is related to the amount of momentum carried off by ejecta produced by the impact. The momentum enhancement of an asteroid due to ejecta is proportional to (β-1). The amount and velocity distribution of ejecta depends on the porosity and density of the surface material, characteristics that are closely related to thermal inertia. We show how it is possible to estimate the surface thermal inertia of an asteroid from Earth-based infrared observations, such as those carried out by NASA’s Wide-field Infrared Survey Explorer (WISE) space telescope, and thereby provide information on physical characteristics relevant to asteroid deflection. Recent research results suggest the thermal inertia of near-Earth objects (NEOs), and therefore the density and thermal conductivity of near-surface material, increases rapidly with depth within the topmost 1m. If density increases with depth, the value of β relevant to the kinetic impactor concept will be larger in general than that implied by the properties of material on the surface. Furthermore, thermal conductivity is an important parameter in calculations of the Yarkovsky orbital drift of NEOs. We briefly describe the relevant observational results and discuss their implications for the effectiveness of the kinetic impactor deflection concept, and for calculations of the Yarkovsky effect relevant to the impact hazard.

elib-URL des Eintrags:https://elib.dlr.de/111693/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:The Relevance of Thermal Inertia to Planetary Defense
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Harris, AlanAlan.Harris (at) dlr.dehttps://orcid.org/0000-0001-8548-8268NICHT SPEZIFIZIERT
Drube, LineLine.Drube (at) dlr.dehttps://orcid.org/0000-0003-2486-8894NICHT SPEZIFIZIERT
Datum:2017
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Asteroid surface structure, thermal inertia, kinetic impactor, Yarkovsky effect
Veranstaltungstitel:Planetary Defence Conference 2017
Veranstaltungsort:Tokyo, Japan
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:15-19 May 2017
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Planetary Evolution and Life (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Leitungsbereich PF
Hinterlegt von: Drube, Line
Hinterlegt am:20 Jul 2017 14:26
Letzte Änderung:20 Jun 2021 15:49

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