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Physical properties of near-Earth asteroid 2011 MD

Mommert, M. and Farnocchia, D. and Hora, J. L. and Chesley, S. R. and Trilling, D. E. and Chodas, P. W. and Mueller, M. and Harris, A. W. and Smith, H. A. and Fazio, G. G. (2014) Physical properties of near-Earth asteroid 2011 MD. The Astrophysical Journal, 789 (1), L22. American Astronomical Society. DOI: 10.1088/2041-8205/789/1/L22 ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/2041-8205/789/1/L22

Abstract

We report on observations of near-Earth asteroid 2011 MD with the Spitzer Space Telescope. We have spent 19.9 hr of observing time with channel 2 (4.5μm) of the Infrared Array Camera and detected the target within the 2σ positional uncertainty ellipse. Using an asteroid thermophysical model and a model of nongravitational forces acting upon the object, we constrain the physical properties of 2011 MD, based on the measured flux density and available astrometry data. We estimate 2011 MD to be 6 (+4,−2)m in diameter with a geometric albedo of 0.3 (+0.4,−0.2) (uncertainties are 1σ). We find the asteroid’s most probable bulk density to be 1.1 (+0.7,−0.5) g cm−3, which implies a total mass of 50–350 t and a macroporosity of greater than or equal to 65%, assuming a material bulk density typical of non-primitive meteorite materials. A high degree of macroporosity suggests that 2011 MD is a rubble-pile asteroid, the rotation of which is more likely to be retrograde than prograde.

Item URL in elib:https://elib.dlr.de/89600/
Document Type:Article
Title:Physical properties of near-Earth asteroid 2011 MD
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mommert, M.Northern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USAUNSPECIFIED
Farnocchia, D.JPL, Caltech, Pasadena, CA 91109, USAUNSPECIFIED
Hora, J. L.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USAUNSPECIFIED
Chesley, S. R.JPL, Caltech, Pasadena, CA 91109, USAUNSPECIFIED
Trilling, D. E.Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 86001, USAUNSPECIFIED
Chodas, P. W.JPL, Caltech, Pasadena, CA 91109, USAUNSPECIFIED
Mueller, M.SRON, 9700 AV Groningen, The NetherlandsUNSPECIFIED
Harris, A. W.alan.harris (at) dlr.deUNSPECIFIED
Smith, H. A.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-65, Cambridge, MA 02138, USAUNSPECIFIED
Fazio, G. G.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-65, Cambridge, MA 02138, USAUNSPECIFIED
Date:2014
Journal or Publication Title:The Astrophysical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:789
DOI :10.1088/2041-8205/789/1/L22
Page Range:L22
Editors:
EditorsEmail
UNSPECIFIEDThe American Astronomical Society
Publisher:American Astronomical Society
ISSN:0004-637X
Status:Published
Keywords:Infrared, Minor planets, Near-Earth asteroids: individual (2011 MD)
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
Deposited By: Harris, Prof. Alan
Deposited On:04 Jul 2014 14:43
Last Modified:06 Sep 2019 15:30

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