Исследование вероятностной орбитальной эволюции астероидов, сближающихся с землей и движущихся в окрестности резонансов с меркурием
| Parent link: | Известия вузов. Физика: научный журнал/ Национальный исследовательский Томский государственный университет (ТГУ).— , 1957- Т. 57, № 10-2.— 2014.— [С. 43-51] |
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| Résumé: | Заглавие с экрана Работа посвящена исследованию движения астероидов, сближающихся с Землей (АСЗ) и движущихся в окрестности резонансов низких порядков с Меркурием. Проведенное исследование показало, что шесть объектов движутся в окрестности резонанса 1/6, пять - в окрестности резонанса 1/9 и по одному астероиду в окрестности резонансов 1/3, 1/7, 1/8 и 2/7. При построении вероятностных областей движения исследуемых АСЗ использовалось 10 тыс. тестовых частиц, покрывающих начальную доверительную область объекта. Интервал исследования выбирался индивидуально для разных объектов и составил от 2 до 6 тыс. лет. Однако орбиты астероидов 2006 SE6, 2009 KT4, 2013 CQ35, 2013 TH, 2002 CV46, 2013 CN35 и 2006 VY2 плохо определены, что не позволяет сделать окончательные выводы об их захвате в резонанс. АСЗ 172034 2001 WR1, 2008 VB1, 159608 2002 AC2 и 2006 UR216 движутся в окрестности резонансов на всем интервале исследования. Вероятностные области 52381 1993 HA, 142561 2002 TX68, 241370 2008 LW8 и 2009 XB2 значительно увеличиваются под влиянием тесных сближений, и часть тестовых частиц выходит из резонанса на границах интервала исследования. The purpose of this work is the investigation of probabilistic orbital evolution of near-Earth asteroids (NEA) moving in the vicinity of resonances with Mercury. In order to identify such objects the equations of all NEA motion have been integrated on the time interval (1000, 3000 years). The initial data has been taken from the E. Bowell catalog on February 2014. The motion equations have been integrated numerically by Everhart method. The resonance characteristics are critical argument that defines the connection longitude of the asteroid and the planet and its time derivative, called resonance "band". The study has identified 15 asteroids moving in the vicinity of different resonances with Mercury. Six of them (52381 1993 HA, 172034 2001 WR1, 2008 VB1, 2009 KT4, 2013 CQ35, 2013 TH) move in the vicinity of the resonance 1/6, five of them (142561 2002 TX68, 159608 2002 AC2, 241370 2008 LW8, 2006 UR216, 2009 XB2) move in the vicinity of the resonance 1/9 and one by one asteroid moves in the vicinity of resonances 1/3, 1/7, 1/8 and 2/7 (2006 SE6, 2002 CV46, 2013 CN35 and 2006 VY2 respectively). The orbits of all identified asteroids have been improved by least square method using the available optical observations and probabilistic orbital evolution has been investigated. Improvement have been carried out at the time of the best conditionality in accounting perturbations from the major planets, Pluto, Moon, Ceres, Pallas and Vesta, the relativistic effects from the Sun and the Solar oblateness. The estimation of the nonlinearity factor has showed that for all the considered NEA it does not exceed the critical value of 0.1, which makes it possible to use the linear method for constructing the initial probability domain. The domain has been built in the form of an ellipsoid in six-dimensional phase space of coordinates and velocity components on the base of the full covariance matrix, the center of ellipsoid is the nominal orbit obtained by improving. The 10 000 clones distributed according to the normal law has been chosen in the initial probability domain. The nonlinear method by numerical integration of the differential equations of each clone motion has been used for study of probabilistic orbital evolution. The force model has corresponded to the model used in the improvement. The time interval has been limited by ephemeris DE406 and accuracy of integration and has been amounted for different objects from two to six thousand years. As a result of the orbit improvement from the available optical positional observations it has been turned out that the orbits of NEA 2006 SE6, 2009 KT4, 2013 CQ35, 2013 TH, 2002 CV46, 2013 CN35 and 2006 VY2 are poorly defined, that does not allow to conclude about their resonance capture. The remaining objects can be divided into two classes. Asteroids 172034 2001 WR1, 2008 VB1, 159608 2002 AC2 and 2006 UR216 move in the vicinity of the resonance over the entire interval of the study. Probability domains of NEA 52381 1993 HA, 142561 2002 TX68, 241370 2008 LW8 и 2009 XB2 are increase significantly under the influence of close encounters, and part of clones are out of resonance. It should be noted that for all the considered objects the critical argument varies around the moving center of libration or circulates that suggests instability resonance. Режим доступа: по договору с организацией-держателем ресурса |
| Langue: | russe |
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2014
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| Accès en ligne: | http://elibrary.ru/item.asp?id=23573484 |
| Format: | Électronique Chapitre de livre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=643250 |