Open Access
Radiometry and a thermal modeling of asteroids
Larry A. Lebofsky,John R. Spencer +1 more
- pp 128-147
TLDR
In this paper, the steps required to determine a radiometric diameter of an asteroid from observations of its visual and thermal radiation are described together with thermal models required to predict the emission expected from a body of given size and bolometric albedo.Abstract:
The steps required to determine a radiometric diameter of an asteroid from observations of its visual and thermal radiation are described together with thermal models required to predict the emission expected from a body of given size and bolometric albedo. It is pointed out, however, that, in some cases, these models were found to fail for a variety of reasons; in particular, they fail to characterize the shape, surface roughness, the rate and sense of rotation, and the maturity of the surface regolith, all of which affect the observed thermal flux. Several thermal models are examined, including the Standard Thermal Model for asteroids, the fast-rotating (isothermal-latitude) model, the thermophysical model, and the rough-surface thermophysical models.read more
Citations
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Journal ArticleDOI
Radiative Spin-up and Spin-down of Small Asteroids
TL;DR: The Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect as mentioned in this paper may spin up or spin down 5-km-radius asteroids on a 108-year timescale.
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A Thermal Model for Near-Earth Asteroids
TL;DR: In this paper, a simple simple thermal model for estimating albedos and diameters of near-Earth asteroids was proposed as a default simple model for estimation albedo and diameter.
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Systematic biases in radiometric diameter determinations
TL;DR: In this article, a disk-integrated beaming parameter of 0.72 was determined for the moon and used to correct empirically for the roughness effects in thermophysical models; the standard thermal model was found to systematically underestimate cold object diameters, while overstating their albedos.
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Thermal inertia of near-Earth asteroids and implications for the magnitude of the Yarkovsky effect
TL;DR: In this paper, the average thermal inertia of a sample of NEAs in the km-size range is 200 ± 40 J m −2 s −0.5 K −1, indicating that the dependence of the drift rate of the orbital semimajor axis on the size of asteroids due to the Yarkovsky effect is a more complex function than the generally adopted D −1 dependence.
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Ceres: Evolution and current state
TL;DR: In this article, the authors modeled several thermal evolution scenarios for Ceres to explore the nature of large, wet protoplanets and to predict current-day evidence that might be found by close inspection, such as by the Dawn mission.