Asteroides cercanos a la Tierra

FERNANDEZ, SILVIA; PATIRI, SANTIAGO; FLORES, SERGIO

Tucuman, Argentina

Congreso; 44 Reunion Anual de la Asociación Argentina de Astronomía; 2000

Universidad Nacional de Tucuman

This work came from a course of Celestial Mechanics at UNSJ. The dynamical behaviour of asteroids belong to NEA class, was analyzed. The work was based on the valuation of possible encounter between the Earth and some selected NEA, analyzing also their orbital elements through the time. For this purpose, a program in FORTRAN language based on Bulirsh-Stoer´s method of integration for differential equations, with five perturbation planets (Venus, Earth+Moon, Mars, Jupiter and Saturn) was elaborated The following criterion were utilized in order to choose the asteroids to be studied: I - Asteroids from PHA (Potentially Hazardous Asteroids), with definitive orbits, from Minor Planet Center. II - Asteroids just discovered with preliminary orbits, from Minor Planet Center. III - The semimajor axis of asteroids were choosen from 0.5 up to 2.5 UA. The results of the integration show that the minimal distance to the barycenter Earth-Moon, for the considered asteroids, is greater than the mean distance Earth-Moon, which is 0.0025 (AU). A program in FORTRAN language was done in order to evaluate the possibility that those asteroids go into the Earth´s sphere influence. In this case, the orbital evolution of the object will be analyzed in order to determine if exist capture, collision or scape.