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Spitzer Albedos of Near-Earth Objects

Gustafsson, Annika and Trilling, David E. and Mommert, Michael and McNeill, Andrew and Hora, Joseph L. and Smith, Howard A. and Hellmich, Stephan and Mottola, Stefano and Harris, Alan W. (2019) Spitzer Albedos of Near-Earth Objects. The Astronomical Journal, 158 (2), p. 67. IOP Publishing. DOI: 10.3847/1538-3881/ab29ea ISSN 0004-6256

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Thermal infrared observations are the most effective way to measure asteroid diameter and albedo for a large number of near-Earth objects (NEOs). Major surveys like NEOWISE, NEOSurvey, ExploreNEOs, and NEOLegacy find a small fraction of high albedo objects that do not have clear analogs in the current meteorite population. About 8% of Spitzer-observed NEOs have nominal albedo solutions greater than 0.5. This may be a result of light-curve variability leading to an incorrect estimate of diameter or inaccurate absolute visual magnitudes. For a sample of 23 high-albedo NEOs we do not find that their shapes are significantly different from the McNeill et al. NEO shape distribution. We performed a Monte Carlo analysis on 1505 NEOs observed by Spitzer, sampling the visible and thermal fluxes of all targets to determine the likelihood of obtaining a high albedo erroneously. Implementing the McNeill shape distribution for NEOs, we provide an upper limit on the geometric albedo of 0.5 ± 0.1 for the near-Earth population.

Item URL in elib:https://elib.dlr.de/131283/
Document Type:Article
Title:Spitzer Albedos of Near-Earth Objects
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gustafsson, AnnikaNorthern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USAUNSPECIFIED
Trilling, David E.Northern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USAUNSPECIFIED
Mommert, MichaelLowell Observatory, Flagstaff, Arizona, USAUNSPECIFIED
McNeill, AndrewNorthern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USAUNSPECIFIED
Hora, Joseph L.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USAUNSPECIFIED
Smith, Howard A.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USAUNSPECIFIED
Hellmich, StephanStephan.Hellmich (at) dlr.deUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Harris, Alan W.alan.harris (at) dlr.deUNSPECIFIED
Date:June 2019
Journal or Publication Title:The Astronomical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.3847/1538-3881/ab29ea
Page Range:p. 67
Publisher:IOP Publishing
Keywords:asteroids: Near-Earth Objects, Astronomical Methods: Infrared Astronomy, Visible Astronomy, Astronomical Techniques: Photometry, Astronomical Reference Material: Surveys, Astrophysics - Earth and Planetary Astrophysics
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 > Asteroids and Comets
Deposited By: Hellmich, Stephan
Deposited On:28 Nov 2019 11:27
Last Modified:28 Nov 2019 11:27

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