M.G. Sokolova*, M.V. Sergienko**
Kazan Federal University, Kazan, 420008 Russia
E-mail: *smarina.63@mail.ru, **maria_sergienko@mail.ru
Abstract
The genetic relationship of meteor streams with near-Earth asteroids (NEAs) is being actively studied. A genetic link with the asteroid is possible only for streams in which meteoroids have the geocentric speed smaller than 50 km/s, thereby meaning the proportionality of their orbits with the orbits of asteroids. To date, there are about 40 such orphan streams with unknown parent bodies.
In the paper, NEA groups (Aten, Apollo, Amor, and Atira) have been considered from the perspective of possible search for the parent bodies of meteor streams among them. The groups have been compared based on the following parameters: eccentricity of asteroid orbits, as well as size and chemical composition of asteroids. Currently, it is considered that the surface of asteroids with elongated orbits is subjected to temperature fall: it is heated in perihelion and cooled in aphelion. Due to small orbital periods around the Sun (about 2–4 years), this may lead to formation of meteoroid clusters.
Therefore, comparison of asteroids by their orbit shape and physicochemical parameters enables us to distinguish between NEA groups of asteroids and the Apollo group as most probable candidates to search for the parent bodies of meteor streams among NEAs.
Unfortunately, finding physicochemical parameters poses great difficulties, since they are only detectable for some asteroids. At the same time, it is impossible to study asteroids dynamics, evolution, and relation with other bodies of the Solar system, as well as to realistically assess the impact of NEAs and products of their disintegration collision with the Earth and to develop systems of anti-asteroid protection without knowing the following parameters of asteroids: mineralogical composition, density, size, and accurate mass.
Keywords: meteoroid, meteor stream, asteroid, comet, orbit
Acknowledgments. This study was funded by the subsidy allocated to Kazan Federal University as part of the state program for increasing its competitiveness among the world's leading centers of science and education, as well as by the Russian Foundation for Basic Research (project no. 15-02-01638-a).
Figure Captions
Fig. 1. The register of meteor streams (Meteor Data Center (МDС), http://www.astro.amu.edu.pl).
Fig. 2. The relative distribution of asteroids based on eccentricity in the groups (according to data from http://ssd.jpl.nasa.gov/sbdb_query.cgi).
Fig. 3. The relative distribution of asteroids based on diameter in the groups (according to data from http://ssd.jpl.nasa.gov/sbdb_query.cgi).
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For citation: Sokolova M.G., Sergienko M.V. Near-Earth asteroids as possible parent bodies of meteor streams. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2016, vol. 158, no. 4, pp. 583–592. (In Russian)
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