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Finding metal-rich asteroids – a NEOShield-2 Study

Drube, Line and Harris, Alan W. (2015) Finding metal-rich asteroids – a NEOShield-2 Study. Division for Planetary Sciences 47th Annual Meeting, 8-13 Nov 2015, Washington DC, USA.

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Official URL: http://adsabs.harvard.edu/abs/2015DPS....4710604D


The 1.2 km diameter Barringer Crater in Arizona was produced by an impact of a metallic asteroid, whereas the impact of a similar sized stony asteroid in 1908 over Tunguska, Russia, resulted in a large airburst but no crater. Studies of the metal content of asteroids are relevant not only to estimations of their potential to wreak devastation on impacting the Earth, but also for theories of their origins and nature, and possibly in the future for endeavors in the field of planetary resources. However the reflection spectra of metallic asteroids are largely featureless, which makes it difficult to identify them and relatively few are therefore known. With reference to radar albedos and taxonomic classifications, we showed (Harris and Drube, 2014) that data from the WISE/NEOWISE thermal-infrared survey (Wright et al. 2010; Mainzer et al. 2011a) fitted with a simple thermal model (NEATM; Harris 1998), can reveal asteroids likely to be metal rich, based on the NEATM fitting parameter, η, which carries information on thermal inertia. To further explore the dependence of η and thermal inertia on taxonomic type, we are continuing analyses of WISE/NEOWISE data and expanding them to include IRAS data (Tedesco et al., 2002). We are calculating the angle between the spin vector and the solar direction, θ, for different sightings of asteroids having known spin vectors. The η values of objects with high thermal inertia and moderate to high spin rates should depend strongly on θ, whereas those with low thermal inertia and/or low spin rates should not. We will present the latest results of our work and provide a demonstration of its potential.

Item URL in elib:https://elib.dlr.de/100036/
Document Type:Conference or Workshop Item (Speech)
Additional Information:EU’s Horizon 2020 Programme under grant agreement no. 640351 (NEOShield-2 Project)
Title:Finding metal-rich asteroids – a NEOShield-2 Study
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Drube, LineUNSPECIFIEDhttps://orcid.org/0000-0003-2486-8894UNSPECIFIED
Date:9 November 2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Asteroid, TIR, WISE
Event Title:Division for Planetary Sciences 47th Annual Meeting
Event Location:Washington DC, USA
Event Type:international Conference
Event Dates:8-13 Nov 2015
Organizer:American Astronomical Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Drube, Line
Deposited On:30 Nov 2015 13:12
Last Modified:20 Jun 2021 15:47

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