Lect8 Radiometry (10-15-09)

Lect8 Radiometry (10-15-09) - Radiometry of Asteroids and...

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Unformatted text preview: Radiometry of Asteroids and Comets (continued) October 15, 2009 OUTLINE I. Introduction: Thermal Emission and Reflected Light II. Standard Thermal Model (STM) III. Deviations from the STM: Fast-rotating (ILM) Thermophysical Model NEATM Non-sphericity I. A Few Examples: 1 Ceres NEAs Comets Centaur 2060 Chiron I. Future Observations II. Standard Thermal Model The Factor For a smooth, non-rotating body, is defined as 1.0. Surface roughness tends to decrease by enhancing sunward emission, and Rotation of a body with non-zero thermal inertia increases . Two slides ago the STM assumes = 0.756, what does that mean in terms of temperature compared with = 1.0. What about rotation and roughness? . III. Deviations from the STM A. Fast-rotating, Thermophysical, and NEATM Models 1. Fast-rotating (a.k.a. rocky): figure 4 . Isothermal Latitude Model (ILM) III. Deviations from the STM A. Fast-rotating, Thermophysical, and NEATM Models 1. Fast-rotating (aka rocky): figure 4 2. Thermophysical: range of parameters between STM and fast-rotating. Can handle non-spherical objects. Needs shape and pole orientation as input. 3. NEATM, variation of the STM to account for NEAs observed at larger range of phase angles and thermal properties different from large Main-Belt asteroids . Requires observations at least at two thermal wavelengths to determine color temperature. . III. Deviations from the STM A. Non-sphericity Departures from sphericity of up to 30% do not have a significant impact on the calculated radius and albedo. However, greater departures have to be incorporated into models (R. H. Brown 1984)....
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This note was uploaded on 11/09/2009 for the course AST 4142 taught by Professor Campins during the Fall '09 term at University of Central Florida.

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Lect8 Radiometry (10-15-09) - Radiometry of Asteroids and...

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