Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23r.239d&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 239-240
Physics
Scientific paper
The work presented here shows the development of a thermal model applied to aste- roid fragments where the temperature of each surface point is adapted in order to take into account the Doppler effect. The direct relation between photon frequency and temperature allow us to obtain a new temperature distribution for the asteroid's surface. This new temperature distribution leads to the so called Relativistic Thermal Reemission model that provides a new force: the relativistic thermal reemission force. This new force has a component similar to the well-known Poynting-Robertson (PR) effect. However, in this case, the PR-like force appears as a consequence of the Doppler effect on photons reemitted with non-isotropic patterns. The analysis of the PR-like force indicates that the maximum PR effect does not occur when the velocity is near to the limit c, but for lower velocity values. In fact, the PR effect decreases to zero when the body approaches the velocity of light. The behavior of asteroid fragments under the effect of these new forces is discussed and some important results are shown. Finally, one of the main conclusions of this work is that most of the several disturbing forces can be unified, leading to a new and simple physical point of view, able to improve the understanding of the physics involved in the radiation processes and to provide more accurate and complete equations for the non-gravitational disturbing forces.
Afonso G. B.
Duha J.
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