Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusm.p41c..01l&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #P41C-01
Physics
5455 Origin And Evolution, 5499 General Or Miscellaneous, 6200 Planetary Sciences: Solar System Objects, 6299 General Or Miscellaneous, 7504 Celestial Mechanics
Scientific paper
The potential energy of planetary orbits relative to the solar surface was modeled. The planetary - solar attracting energy was related to the launch energy (proportional to launch velocity) that is necessary to move an object from the solar surface to the planetary orbit (vp,`planetary launch velocity'). This launch energy is related to the planetary potential energy relative to the solar surface. The planetary launch velocities range from 613.830 (Mercury) to 617.526 km/s (Pluto). The difference between solar escape velocity (vs, 617.547km /s) and planetary launch speeds represents the strength of adhesion to the Sun relative to infinity. The velocity difference ranges from 3.7km/s (Mercury) to 0.037 km/s (Pluto). The planetary orbits are expanding and orbital periods are increasing with time due to solar mass loss by thermonuclear radiative process,mass loss by solar wind, and the weak binding of the planets. Separation rates were calculated and range from 4.32E-04 to 14.6 km/yr for Mercury and Eris, respectively. The predicted present orbital separation rates are within the range of experimental observation. The planets will escape the solar system when the solar escape velocity decreases below the planetary launch velocity. From this, the planetary separation time is calculated for the current solar mass loss rate to 133.8 and 0.76 billion years for Mercury and Eris, respectively. The model implies that the planets were significantly closer to the sun after the formation of the solar system. The transition from water to ice for Mars was correccly predicted to about 3.6 billion years ago(2005 AGU Fall Meting).
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