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Physical Characteristics of Near-Earth Asteroids from Thermal Infrared Spectrophotometry

Harris, A. W. and Davies, J. K. (1999) Physical Characteristics of Near-Earth Asteroids from Thermal Infrared Spectrophotometry. Icarus, 142, pp. 464-475.

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Abstract

Thermal infrared spectrophotometric observations of the near-Earth asteroids 433 Eros, 1980 Tezcatlipoca, and 3671 Dionysus are presented and their implications for the physical characteristics of the objects discussed. Sizes and albedos are derived on the basis of published thermal models and comparison of the infrared data with optical observations. The results for 433 Eros are in very good agreement with radar and other earlier findings and demonstrate the accuracy achievable with one of the thermal models used. The new data, together with earlier results from literature, suggest the surface thermal inertia of 433 Eros is no larger than three times that of the Moon. The derived effective diamter and optical albedo of 1980 Tezcatlipoca (around lightcurve maximum) are D=6.7±1.0 km and pv=0.15±0.05, and for 3671 Dionysus D=1.0±0.2 km and pv=0.40±0.15. These diameters are significantly different from previous estimates. The thermal continua of Texcatlipoca and Dionysus are indicative of high surface thermal inertias. A near-infreared spectrum of Dionysus, coupled with the high albedo, suggests an M or E classification. Such taxonomic types are relatively rare amongst near-Earth asteroids.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1999,
Title:Physical Characteristics of Near-Earth Asteroids from Thermal Infrared Spectrophotometry
Authors:
AuthorsInstitution or Email of Authors
Harris, A. W.UNSPECIFIED
Davies, J. K.UNSPECIFIED
Date:1999
Journal or Publication Title:Icarus
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:142
Page Range:pp. 464-475
Status:Published
Keywords:asteroids, Eros, infrared observations, spectrophotometry, surfaces of asteroids
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 > Institut für Planetenerkundung
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 15:47

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