Constraining the physical properties of Near-Earth object 2009 BD

M. Mommert, J. L. Hora, D. Farnocchia, S. R. Chesley, D. Vokrouhlický, David E Trilling, M. Mueller, A. W. Harris, H. A. Smith, G. G. Fazio

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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 (p = 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 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.

Original languageEnglish (US)
Article number148
JournalAstrophysical Journal
Volume786
Issue number2
DOIs
StatePublished - May 10 2014

Fingerprint

near Earth objects
asteroids
asteroid
physical property
physical properties
International System of Units
Space Infrared Telescope Facility
regolith
robotics
albedo
inertia
range size
retrieval
slab
slabs
derivation
flux density
cameras
rocks
orbitals

Keywords

  • Asteroids: individual (2009 BD)
  • Infrared: planetary systems
  • Minor planets

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Mommert, M., Hora, J. L., Farnocchia, D., Chesley, S. R., Vokrouhlický, D., Trilling, D. E., ... Fazio, G. G. (2014). Constraining the physical properties of Near-Earth object 2009 BD. Astrophysical Journal, 786(2), [148]. https://doi.org/10.1088/0004-637X/786/2/148

Constraining the physical properties of Near-Earth object 2009 BD. / Mommert, M.; Hora, J. L.; Farnocchia, D.; Chesley, S. R.; Vokrouhlický, D.; Trilling, David E; Mueller, M.; Harris, A. W.; Smith, H. A.; Fazio, G. G.

In: Astrophysical Journal, Vol. 786, No. 2, 148, 10.05.2014.

Research output: Contribution to journalArticle

Mommert, M, Hora, JL, Farnocchia, D, Chesley, SR, Vokrouhlický, D, Trilling, DE, Mueller, M, Harris, AW, Smith, HA & Fazio, GG 2014, 'Constraining the physical properties of Near-Earth object 2009 BD', Astrophysical Journal, vol. 786, no. 2, 148. https://doi.org/10.1088/0004-637X/786/2/148
Mommert M, Hora JL, Farnocchia D, Chesley SR, Vokrouhlický D, Trilling DE et al. Constraining the physical properties of Near-Earth object 2009 BD. Astrophysical Journal. 2014 May 10;786(2). 148. https://doi.org/10.1088/0004-637X/786/2/148
Mommert, M. ; Hora, J. L. ; Farnocchia, D. ; Chesley, S. R. ; Vokrouhlický, D. ; Trilling, David E ; Mueller, M. ; Harris, A. W. ; Smith, H. A. ; Fazio, G. G. / Constraining the physical properties of Near-Earth object 2009 BD. In: Astrophysical Journal. 2014 ; Vol. 786, No. 2.
@article{e55e366ea45e4e029f2ee253e6769ad2,
title = "Constraining the physical properties of Near-Earth object 2009 BD",
abstract = "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 (p = 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 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.",
keywords = "Asteroids: individual (2009 BD), Infrared: planetary systems, Minor planets",
author = "M. Mommert and Hora, {J. L.} and D. Farnocchia and Chesley, {S. R.} and D. Vokrouhlick{\'y} and Trilling, {David E} and M. Mueller and Harris, {A. W.} and Smith, {H. A.} and Fazio, {G. G.}",
year = "2014",
month = "5",
day = "10",
doi = "10.1088/0004-637X/786/2/148",
language = "English (US)",
volume = "786",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Constraining the physical properties of Near-Earth object 2009 BD

AU - Mommert, M.

AU - Hora, J. L.

AU - Farnocchia, D.

AU - Chesley, S. R.

AU - Vokrouhlický, D.

AU - Trilling, David E

AU - Mueller, M.

AU - Harris, A. W.

AU - Smith, H. A.

AU - Fazio, G. G.

PY - 2014/5/10

Y1 - 2014/5/10

N2 - 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 (p = 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 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.

AB - 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 (p = 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 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.

KW - Asteroids: individual (2009 BD)

KW - Infrared: planetary systems

KW - Minor planets

UR - http://www.scopus.com/inward/record.url?scp=84902985883&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84902985883&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/786/2/148

DO - 10.1088/0004-637X/786/2/148

M3 - Article

VL - 786

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 148

ER -