Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...459..275v&link_type=abstract
Astronomy and Astrophysics, Volume 459, Issue 1, November III 2006, pp.275-282
Astronomy and Astrophysics
Astrophysics
4
Radiation Mechanisms: Thermal
Scientific paper
Context: .Precise observations and long orbital arcs make determining the orbit of small near-Earth asteroids a task of ever increasing difficulty. Subtle perturbations, such as relativistic terms or radiation forces, must be taken into account. Aims: .Vokrouhlický & Milani (2000) studied the orbital effects of radiation pressure on those spherical bodies with north-south asymmetry in taking the optical surface albedo value. However, their analysis omitted the complementary effect of recoil due to thermal radiation. Here we determine this component and study the degree of compensation between these two effects. Methods: .We use an analytic approach that requires linearization of the heat-diffusion boundary condition on the surface of the body and weakly eccentric orbits. We determine both diurnal and seasonal components of the thermal force due to albedo asymmetry, and we compute the related orbit-averaged change of the semimajor axis, eccentricity, and inclination. Results: .Within the limits of our approximation and with a plausible value of thermal parameters for small near-Earth asteroids, we show that the orbit-perturbation due to anisotropic reflection in the optical waveband is largely compensated by the anisotropic reflection in the thermal waveband. The resulting effect amounts to ~25% of the effect in the optical at maximum.
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