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NAM2012 - All Presentation Details

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ATPM: A Rough Surface Thermal Model For Atmosphereless Planetary Bodies

Author: Ben Rozitis

The Open University

Co-Authors: S.F.Green (The Open University); S.D.Wolters (Jet Propulsion Laboratory); S.R.Duddy (University of Kent); S.C.Lowry (University of Kent)

Session: PL1: Small bodies in Our Solar System

Presentation type: Talk      12:18  Tuesday 27th 11:45-13:00 

Summary:

Thermal-infrared emission from atmosphereless planetary surfaces contains signatures that are diagnostic of their physical properties, which can be studied through ground- and spacecraft-based observations. Furthermore, for an irregularly shaped asteroid this radiation is emitted asymmetrically and results in a net photon force and torque. The net force causes orbital drift (Yarkovsky effect) and the net torque alters the spin state (YORP effect) of an asteroid. The Advanced Thermophysical Model (ATPM) is the first model capable of simultaneously interpreting asteroid thermal-infrared observations and for predicting the Yarkovsky and YORP effects [1,2]. The ATPM explicitly incorporates sub-surface heat conduction, shadowing, multiple scattering of sunlight, self-heating, and rough-surface thermal-infrared beaming effects. It has been successfully applied to a variety of planetary bodies including The Moon [1], asteroids [3], and comets [4] to infer their likely surface properties. It has also been used to investigate the influence of rough-surface thermal-infrared beaming on the asteroid Yarkovsky and YORP effects [2]. Current applications and developments of the model will be presented and discussed. [1] Rozitis & Green, 2011, MNRAS, 415, p2042 [2] Rozitis & Green, 2012, MNRAS, submitted [3] Wolters et al., 2011, MNRAS, 418, p1246 [4] Lowry et al., 2012, in preparation

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