Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993crlrv..39..261y&link_type=abstract
Review of the Communications Research Laboratory, vol. 39, p. 261
Physics
Asteroids, Asteroid Collisions, Celestial Mechanics, Orbital Elements, Perturbation, Solar System, Planetary Gravitation
Scientific paper
At present, the orbital elements of more than 5,500 asteroids have been determined, and this number is increasing as fainter asteroids are discovered. Moreover, recently we have observed some asteroids that have approached to the earth very closely. As a result the possibility of asteroids colliding with the earth should be considered. In this paper, first the distribution and the motion of asteroids are summarized, and it is shown that the features of distribution are closely related to the dynamical properties of the asteroids. Then, the results of analysis of the near-miss phenomena are discussed. In this analysis, we calculated the orbital motions of 4,506 numbered asteroids, taking into account the effect of the gravitational attraction between asteroids as well as the perturbation of nine planets. The calculation was carried out for a period of about 130 years into the future, and close encounters between the earth and asteroids of less than 0.2 AU were monitored. Using this calculation, we found that many asteroids will come close to the earth, but there is no possibility of collision. Therefore, there is no need to worry about the earth colliding with known asteroids at present. However, there are many unknown asteroids, so we should extend our observations in order to discover them.
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