Перегляд за Автор "Gorbanev, Yu. M."

Зараз показуємо 1 - 2 з 2
  • Ескіз
    Документ
    Groups of meteorite-producing meteoroids and meteorites in asteroidal orbits and their sources
    (Одеський національний університет імені І. І. Мечникова, 2020) Gorbanev, Yu. M.; Konovalova, N. A.; Davruqov, N. Kh.
    This paper presents the results of the analysis of possible existence of nine near-Earth meteorite-producing groups in asteroidal orbits, consisting of sporadic fireballs from the IAU MDC 2007 database, sporadic meteors from the SonotaCo database, meteorites - namely, L5, L6 and H4-H6 ordinary chondrites and an ureilite, for which atmospheric and orbital parameters are known from instrumental observations - and their plausible parent bodies, that is, near-Earth asteroids (NEAs). Orbits of the selected members of meteoriteproducing groups were classified as asteroidal according to the Tisserand parameter TJ > 3.1. In order to test the link between meteorite-producing groups in asteroidal orbits and their plausible parent bodies, we carried out an investigation into the possible existence of some known NEAs that move in similar orbits. Based on the orbital similarity, determined using the Drummond (Dd) and Southworth & Hawkins (Dsh) orbital similarity criteria, some associations between the identified NEAs, known meteorites in asteroidal orbits and small, as well as meteorite-dropping, meteoroids have been suggested. As a result, several meteorite-dropping sporadic fireballs and small meteors, whose orbits are currently similar to the orbits of known meteorites, have been detected and reckoned as possible members of the groups in asteroidal orbits; their plausible source regions have also been considered.
  • Ескіз
    Документ
    Specific features of structures in the inner coma of comet C/2017 T2 (panstarrs) as observed with the OMT-800 telescope of the Odessa Observatory telescope network
    (Одеський національний університет імені І. І. Мечникова, 2020) Kleshchonok, V. V.; Kashuba, S. G.; Andrievsky, S. M.; Gorbanev, Yu. M.
    Observations of the comet were carried out using the OMT-800 telescope (the primary mirror diameter D = 80 cm; the focal length F = 214 cm) of the Odessa Observatory telescope network from January to June 2020. Image processing was performed through standard methods using subtraction of dark and flat field frames. The resulting frames were employed to analyse the morphology of the cometary inner coma using digital filters. Isophotes of the coma and images of its structures appearing as fans and jets were obtained. The presence of a strong fan, which distorts the coma’s standard appearance and makes it elongated perpendicularly to the Sun-comet line, is observed over the period from January to April. Later on, a weak jet that hardly affects the coma’s standard shape appears to replace the fan. The jet reaches its peak intensity near perihelion and then gets fainter rapidly. Such behaviour of the coma structures is indicative of the presence of two active areas on the cometary nucleus surface, for which the matter outflow is governed by the Sun illumination conditions. One of these areas, being more active, is responsible for the appearance of a strong fan. The other area, which is far less active, generates a jet that manifests itself near perihelion. The peak dust production of the comet 120-150 days before perihelion is due to the presence of an active fan in the inner coma.