Перегляд за Автор "Konovalova, N. A."

Зараз показуємо 1 - 5 з 5
  • Ескіз
    Документ
    Evolution of comet-like orbits of meteoriteproducing groups and their parent bodies
    (Одеський національний університет імені І. І. Мечникова, 2019) Konovalova, N. A.; Gorbanev, Yuriy M.; Davruqov, N. H.; Горбаньов, Юрій Михайлович; Горбанёв, Юрий Михайлович
    This paper presents the results of the study of evolution of Jupiter-family comet-like orbits of six meteorite-producing groups, including sporadic fireballs from the IAU MDC database 2007 [1], sporadic meteors from the SonataCo database [2], instrumentally observed H5 and L3.5 ordinary chondrites, as well as near-Earth asteroids which are potential parents of the examined groups. In order to verify the relationship between meteorite-producing groups and their potential parents, we performed backward numerical integration of the orbital motion of these groups’ members over several millennia. The numerical integration was carried out using the Halley software [3]. The equations of motion factored in gravitational perturbations due to the major planets, radiation pressure effects and the Poynting-Robertson drag. The equations of motion were numerically integrated using the 11th -order Everhart method applicable to studying the motion of Jupiter-approaching short-period comets. The numerical integration of the mean orbital elements of a group, as well as those of the relevant meteorite and potential parent asteroid, over 5,000 years has shown that the respective perihelia, eccentricities and arguments of perihelion evolved in a similar manner over the specified period. The DSH-criterion of Southworth and Hawkins [4], which is a quantitative measure of orbital similarity, has remained below 0.3 [5] for about 5,000 years in the groups of Neuschwanstein and Mason Gully meteorites and for about 3,500 to 4,500 years in the groups of Benešov and Park Forest meteorites. In the groups of the Košice and Pribram meteorites, the mean orbits and those of their potential parents remained similar as defined in terms of the DSH-criterion over a relatively short period of about 2,000 to 3,000 years. We can infer from our findings that meteorite-producing sporadic fireballs and sporadic meteors are related to the H5 and L3.5 ordinary chondrites and their potential parents, i.e. near-Earth asteroids, in the investigated groups. The estimated time intervals, over which the evolving orbits of the groups’ members have shown good similarity, are indicative of relatively recent formation of meteorite-producing groups as a result of fragmentation of their parent bodies.
  • 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
    Groups of meteorites and meteorite-dropping fireballs in asteroidal orbits
    (2021) Gorbanev, Yuriy M.; Konovalova, N. A.; Davruqov, N. Kh.; Горбаньов, Юрій Михайлович; Горбанёв, Юрий Михайлович
    This paper presents the results of a study of the existence of nine near-Earth meteorite-producing groups in asteroidal orbits, containing sporadic reballs 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. Orbits of the selected members of meteorite-producing groups were classi ed as asteroid orbits according to the Tisserand parameter Tj > 3.1. Dynamic links between the members of the identi ed meteorite-producing groups and instrumentally observed known meteorites which were taken as a reference for the search of potential group members were tested using orbital similarity criteria, in particular the Drummond criterion DD and the Southworth and Hawkins criterion DSH. As a result, several meteorite-dropping sporadic reballs and small meteors, whose orbits are similar to the asteroid orbits of nine known meteorites, were detected and reckoned as possible members of meteorite-producing groups.
  • Ескіз
    Документ
    On the annual occurrence of large and small sporadic meteoroids and meteorites
    (2019) Konovalova, N. A.; Gorbanev, Yuriy M.; Davruqov, N. Kh.; Горбаньов, Юрій Михайлович; Горбанёв, Юрий Михайлович
    The observations of the meteors and bright fireballs by meteor stations and fireball networks allows to get the more precise data on atmospheric trajectories and heliocentric orbits of this bodies. In recent years, several works were published on the subjects of the annual occurrence of fireballs. On the base of the Millman Fireball Archive the time of occurrence data for 2373 fireball events observed from across Canada was studied Beech [1]. An analysis of the frequency of the superfireballs based on the reports which appeared in newspapers in the last 150 years was made in [2]. Shrbeny et al. [3] studied the fireball activity from the Desert Fireball Network records from 2006 to 2014 and identified several time periods with increased number of fireballs. We present here the results of the analysis of annual occurrence of large and small sporadic meteoroids and meteorites with known fall data.
  • Ескіз
    Документ
    The existence of groups of meteorite-producing fireballs and meteorites in comet-like orbits
    (Одеський національний університет імені І. І. Мечникова, 2018) Konovalova, N. A.; Gorbanev, Yuriy M.; Davruqov, N. H.
    This paper discusses the existence of groups of meteorite-producing fireballs and ordinary chondrites in the Earth-crossing Jupiter-family comet-like (JFC) orbits. The similarity of the orbits of meteoriteproducing fireballs and those of meteorites in the groups was established by applying three criteria of orbital similarity – namely, the DSH criterion introduced by Southworth and Hawkins, the DDR criterion suggested by Drummond, and DN criterion reported by Jopek. We have detected six groups of meteorite-producing meteoroids and ordinary chondrites of L3.5-H5 types observed over the determined periods of increased fireball activity. Carrying out systematic and well-targeted observations, especially during the determined periods of increased fireball activity, enables to obtain reliable statistics from the collected observational data on the meteorite-producing meteoroids in order to determine their orbits, as well as their physical characteristics. The six target groups in this study, which contain 89 meteorite-producing meteoroids and six ordinary chondrites, may be groups of dynamically connected bodies. The genetic relationship between the investigated bodies within groups needs to be considered on the basis of the analysis of orbital evolution of the members of each group over the past several thousand years. The data on the mean heliocentric orbit of the group of meteorite-producing meteoroids enable us to link the group with its likely source, which may be either an asteroid, a family of asteroids or a comet, thereby making it possible to obtain information about the source itself. The search for potential parent bodies of the investigated groups of meteorite-producing fireballs and meteorites was carried out among new near-Earth asteroids. Consequently, several asteroids were selected in each group with the following criteria of the similarity between the asteroid orbit and mean orbit of the respective group: DD ≤ 0.06, DSH and DN ≤ 0.12.