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Thermophysical properties of Almahata Sitta meteorites (asteroid 2008 TC3) for high-fidelity entry modeling

Löhle, Stefan and Jenniskens, Peter and Böhrk, Hannah and Bauer, Thomas and Elsäßer, Henning and Sears, Derek W. and Zolensky, Michael E. and Shaddad, Muawia H. (2016) Thermophysical properties of Almahata Sitta meteorites (asteroid 2008 TC3) for high-fidelity entry modeling. Meteoritics & Planetary Science. Wiley. DOI: 10.1111/maps.12788 ISBN ISSN: 1945-5100 ISSN 1086-9379

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/maps.12788/full

Abstract

Asteroid 2008 TC3 was characterized in a unique manner prior to impacting Earth's atmosphere, making its October 7, 2008, impact a suitable field test for or validating the application of high-fidelity re-entry modeling to asteroid entry. The accurate modeling of the behavior of 2008 TC3 during its entry in Earth's atmosphere requires detailed information about the thermophysical properties of the asteroid's meteoritic materials at temperatures ranging from room temperature up to the point of ablation (T ~ 1400 K). Here, we present measurements of the thermophysical properties up to these temperatures (in a 1 atm. pressure of argon) for two samples of the Almahata Sitta meteorites from asteroid 2008 TC3: a thick flat-faced ureilite suitably shaped for emissivity measurements and a thin flat-faced EL6 enstatite chondrite suitable for diffusivity measurements. Heat capacity was determined from the elemental composition and density from a 3-D laser scan of the sample. We find that the thermal conductivity of the enstatite chondrite material decreases more gradually as a function of temperature than expected, while the emissivity of the ureilitic material decreases at a rate of 9.5 × 10−5 K−1 above 770 K. The entry scenario is the result of the actual flight path being the boundary to the load the meteorite will be affected with when entering. An accurate heat load prediction depends on the thermophysical properties. Finally, based on these data, the breakup can be calculated accurately leading to a risk assessment for ground damage.

Item URL in elib:https://elib.dlr.de/108885/
Document Type:Article
Title:Thermophysical properties of Almahata Sitta meteorites (asteroid 2008 TC3) for high-fidelity entry modeling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Löhle, Stefaninstitut für Raumfahrtsysteme, Universität StuttgartUNSPECIFIED
Jenniskens, PeterSETI Institute, Carl Sagan Center, California, USAUNSPECIFIED
Böhrk, HannahHannah.Boehrk (at) dlr.deUNSPECIFIED
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Elsäßer, Henninghenning.elsaesser (at) dlr.deUNSPECIFIED
Sears, Derek W.NASA Ames Research Center, Mountain View, California, USAUNSPECIFIED
Zolensky, Michael E.ARES, NASA Johnson Space Center, Houston, Texas, USAUNSPECIFIED
Shaddad, Muawia H.Physics Department, University of Khartoum, Khartoum, SudanUNSPECIFIED
Date:6 November 2016
Journal or Publication Title:Meteoritics & Planetary Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1111/maps.12788
Publisher:Wiley
ISSN:1086-9379
ISBN:ISSN: 1945-5100
Status:Published
Keywords:Asteroid, thermophysical properties, atmospheric entry, ureilite, enstatite chondrite
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Fligthexperiment Newfex, R - Shefex III
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Böhrk, Hannah
Deposited On:19 Dec 2016 11:05
Last Modified:06 Sep 2019 15:15

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