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Constraining the physical properties of near-earth object 2009 BD

Mommert, M. and Hora, J.L. and Farnocchia, D. and Chesley, S. R. and Vokrouhlicky, D. and Trilling, D. and Mueller, M. and Harris, Alan W. and Smith, H.A. and Fazio, G.G. (2014) Constraining the physical properties of near-earth object 2009 BD. The Astrophysical Journal, 786 (148). American Astronomical Society. doi: 10.1088/0004-637X/786/2/148. ISSN 0004-637X.

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Official URL: http://iopscience.iop.org/0004-637X/786/2/148/pdf/0004-637X_786_2_148.pdf


We report on Spitzer Space Telescope Infrared Array Camera observations of near-Earth object 2009 BD that were carried out in support of the NASA Asteroid Robotic Retrieval Mission concept. We did not detect 2009 BD in 25 hr of integration at 4.5 μm. Based on an upper-limit flux density determination from our data, we present a probabilistic derivation of the physical properties of this object. The analysis is based on the combination of a thermophysical model with an orbital model accounting for the non-gravitational forces acting upon the body. We find two physically possible solutions. The first solution shows 2009 BD as a 2.9 ± 0.3 m diameter rocky body (ρ = 2.9 ± 0.5 g cm−3) with an extremely high albedo of 0.85 (+0.20, −0.10) that is covered with regolith-like material, causing it to exhibit a low thermal inertia (Γ = 30 +20, −10 SI units). The second solution suggests 2009 BD to be a 4 ± 1 m diameter asteroid with pV = 0.45 (+0.35, −0.15) that consists of a collection of individual bare rock slabs (Γ = 2000 ± 1000 SI units, ρ = 1.7 +0.7, −0.4 g cm−3). We are unable to rule out either solution based on physical reasoning. 2009 BD is the smallest asteroid for which physical properties have been constrained, in this case using an indirect method and based on a detection limit, providing unique information on the physical properties of objects in the size range smaller than 10 m.

Item URL in elib:https://elib.dlr.de/89218/
Document Type:Article
Title:Constraining the physical properties of near-earth object 2009 BD
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mommert, M.Northern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USAUNSPECIFIED
Hora, J.L.Harvard-Smithsonian Center for Astrophysics, MA 02138-1516, USAUNSPECIFIED
Farnocchia, D.JPL, Caltech, Pasadena, CA 91109, USAUNSPECIFIED
Chesley, S. R.JPL, Caltech, Pasadena, CA 91109, USAUNSPECIFIED
Vokrouhlicky, D.Charles University, CZ-18000, Prague 8, Czech RepublicUNSPECIFIED
Trilling, D.Northern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USAUNSPECIFIED
Mueller, M.SRON, 9700 AV Groningen, The NetherlandsUNSPECIFIED
Harris, Alan W.alan.harris (at) dlr.deUNSPECIFIED
Smith, H.A.Harvard-Smithsonian Center for Astrophysics, MA 02138-1516, USAUNSPECIFIED
Fazio, G.G.Harvard-Smithsonian Center for Astrophysics, MA 02138-1516, USAUNSPECIFIED
Date:10 May 2014
Journal or Publication Title:The Astrophysical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1088/0004-637X/786/2/148
EditorsEmailEditor's ORCID iD
American Astronomical Society, AASUNSPECIFIEDUNSPECIFIED
Publisher:American Astronomical Society
Keywords:infrared: planetary systems minor planets, asteroids: individual (2009 BD)
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: Harris, Prof. Alan
Deposited On:26 May 2014 08:54
Last Modified:06 Sep 2019 15:30

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