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The cool surfaces of binary near-Earth asteroids

Delbo, M. and Walsh, K. and Mueller, M. and Harris, A. W. and Howell, E. S. (2011) The cool surfaces of binary near-Earth asteroids. Icarus: International Journal of Solar System Studies, 212, pp. 138-148. Elsevier. doi: 10.1016/j.icarus.2010.12.011.

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Official URL: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WGF-51S0WX2-3-D&_cdi=6821&_user=100058&_pii=S0019103510004689&_origin=gateway&_coverDate=03%2F31%2F2011&_sk=997879998&view=c&wchp=dGLbVtb-zSkzV&md5=d97df02742b9e8f285d7437672711f37&ie=/sdarticle.pd


Here we show results from thermal-infrared observations of km-sized binary near-Earth asteroids (NEAs). We combine previously published thermal properties for NEAs with newly derived values for three binary NEAs. The eta value derived from the near-Earth asteroid thermal model (NEATM) for each object is then used to estimate an average thermal inertia for the population of binary NEAs and compared against similar estimates for the population of non-binaries. We find that these objects have, in general, surface temperatures cooler than the average values for non-binary NEAs as suggested by elevated eta values. We discuss how this may be evidence of higher-than-average surface thermal inertia. This latter physical parameter is a sensitive indicator of the presence or absence of regolith: bodies covered with fine regolith, such as the Earth’s moon, have low thermal inertia, whereas a surface with little or no regolith displays high thermal inertia. Our results are suggestive of a binary formation mechanism capable of altering surface properties, possibly removing regolith: an obvious candidate is the YORP effect. We present also newly determined sizes and geometric visible albedos derived from thermal-infrared observations of three binary NEAs: (5381) Sekhmet, (153591) 2001 SN263, and (164121) 2003 YT1. The diameters of these asteroids are 1.41 ± 0.21 km, 1.56 ± 0.31 km, and 2.63 ± 0.40 km, respectively. Their albedos are 0.23 ± 0.13, 0.24 ± 0.16, and 0.048 ± 0.015, respectively.

Item URL in elib:https://elib.dlr.de/69298/
Document Type:Article
Title:The cool surfaces of binary near-Earth asteroids
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Delbo, M.UNS-CNRS-Observatoire de la Côte d’Azur, Laboratoire Cassiopée, Nice, FranceUNSPECIFIED
Walsh, K.UNS-CNRS-Observatoire de la Côte d’Azur, Laboratoire Cassiopée, Nice, FranceUNSPECIFIED
Mueller, M.UNS-CNRS-Observatoire de la Côte d’Azur, Laboratoire Cassiopée, Nice, FranceUNSPECIFIED
Harris, A. W.alan.harris (at) dlr.deUNSPECIFIED
Howell, E. S.Arecibo Observatory, Arecibo, Puerto Rico, USAUNSPECIFIED
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2010.12.011
Page Range:pp. 138-148
Keywords:Asteroids Satellites of asteroids Infrared observations
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Harris, Prof. Alan
Deposited On:11 May 2011 14:25
Last Modified:26 Mar 2013 13:27

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