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Keck observations of near-Earth asteroids in the thermal infrared

Delbo, M. and Harris, A. W. and Binzel, R. P. and Pravec, P. and Davies, J. K. (2003) Keck observations of near-Earth asteroids in the thermal infrared. Icarus, 166, pp. 116-130. Elsevier. doi: 10.1016/j.icarus.2003.07.002. ISSN 0019-1035.

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We present the results of thermal-infrared observations of 20 near-Earth asteroids (NEAs) obtained in the period March 2000–February 2002 with the 10-m Keck-I telescope on Mauna Kea, Hawaii. The measured fluxes have been fitted with thermal-model emission continua to determine sizes and albedos. This work increases the number of NEAs having measured albedos by 35%. The spread of albedos derived is very large (pv=0.02-0.55); the mean value is 0.25, which is much higher than that of observed main-belt asteroids. In most cases the albedos are in the ranges expected for the spectral types, although some exceptions are evident. Our results are consistent with a trend of increasing albedo with decreasing size for S-type asteroids with diameters below 20 km. A number of objects are found to have unexpectedly low apparent color temperatures, which may reflect unusual thermal properties. However, the results from our limited sample suggest that high thermal-inertia, regolith-free objects may be uncommon, even amongst NEAs with diameters of less than 1 km. We discuss the significance of our results in the light of information on these NEAs taken from the literature and the uncertainties inherent in applying thermal models to near-Earth asteroids.

Item URL in elib:https://elib.dlr.de/10854/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2003,
Title:Keck observations of near-Earth asteroids in the thermal infrared
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Binzel, R. P.Department of Earth, Atmospheric, and Planetary Sciences, MIT, Cambridte, MA, USAUNSPECIFIEDUNSPECIFIED
Pravec, P.Astronomical Institute, Academy of Sciences of the Czech Republic, OndYejov, Czech RepublicUNSPECIFIEDUNSPECIFIED
Davies, J. K.Astronomy Technology Centre, Royal Observatory Edinburgh, Edinburgh, UKUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 116-130
Keywords:Asteroids, infrared observations, photometry, spectrophotometry
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):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:23

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