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Metallic Asteroids in the IRAS Minor Planet Survey - a NEOShield Study

Drube, Line and Harris, Alan W. (2014) Metallic Asteroids in the IRAS Minor Planet Survey - a NEOShield Study. Asteroids, Comets, and Meteors, 30. Jun - 4. Jul 2014, Helsinki, Finland.

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Abstract

Studies of the compositions of asteroids, especially their metal content, are relevant not only to investigations of their nature, but also to estimations of their potential to wreak devastation on impacting the Earth. In this respect it is informative to compare the airburst of a stony object, such as the Tunguska event, which destroyed a forest but left no crater, with the impact of a similarly sized metallic object, which produced the 1.2 km diameter Barringer Crater in Arizona. In view of the evident link between metal content and the near-Earth asteroid thermal model (NEATM; Harris 1998) fitting parameter, eta, which carries information on thermal inertia (Harris and Drube, 2014; see abstract submitted to this conference), we are carrying out a re-analysis of Infrared Astronomical Satellite (IRAS) data (Tedesco et al., 2002) with NEATM to further explore the dependence of eta and thermal inertia on metal content. In addition to calculating best-fit values of eta, we are calculating the angle between the spin vector and the solar direction, theta, for all IRAS sightings of each asteroid for which a spin vector is available. The eta values of objects with high thermal inertia and moderate to high spin rates should depend strongly on theta, whereas those with low thermal inertia and/or low spin rates should not. By studying the relationships between theta and eta, we aim to further explore the potential of the results of Harris and Drube (2014) and provide insight into relationships between asteroid thermal properties, taxonomic type, albedo, spin rate, etc. We will present the first results of our work and provide a demonstration of its potential. The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 282703 (NEOShield Project). Harris, A. W., 1998, Icarus, 131, 291. Harris, A. W. and Drube, L, 2014, Ap. J. Letters, 785, L4 Tedesco, E. F. et al, 2002, Astron. J., 123, 1056.

Item URL in elib:https://elib.dlr.de/89973/
Document Type:Conference or Workshop Item (Speech)
Additional Information:NEOShield Project
Title:Metallic Asteroids in the IRAS Minor Planet Survey - a NEOShield Study
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Drube, LineLine.Drube (at) dlr.dehttps://orcid.org/0000-0003-2486-8894
Harris, Alan W.alan.harris (at) dlr.deUNSPECIFIED
Date:July 2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:asteroids, metal, metallic asteroids, M-types, NEOShield
Event Title:Asteroids, Comets, and Meteors
Event Location:Helsinki, Finland
Event Type:international Conference
Event Dates:30. Jun - 4. Jul 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Drube, Line
Deposited On:15 Aug 2014 13:05
Last Modified:31 Jul 2019 19:47

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