SECULAR DYNAMICS OF SELECTED ASTEROID FAMILIES

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SECULAR DYNAMICS OF SELECTED ASTEROID FAMILIES

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dc.contributor.advisor Novaković, Bojan
dc.contributor.author Tsirvoulis, Georgios
dc.date.accessioned 2019-01-23T14:49:57Z
dc.date.available 2019-01-23T14:49:57Z
dc.date.issued 2019
dc.identifier.uri http://hdl.handle.net/123456789/4752
dc.description.abstract Asteroid families are populations of asteroids in the Main Belt that share a common origin, that is they are the fragments of energetic collisions between two asteroids. Their study over the years has produced a number of important results concerning the collisional and dynamical evolution of the Main Belt, the physical properties of the primordial bodies of the Solar System and the physics of energetic collisions, to name a few. The contribution of the present thesis can be summarized into two main topics: The first is the discovery of a new mechanism that leads to significant perturbations on the orbits of asteroids, and consequently on the evolution of asteroid families affected by it, and the second is the discovery of a couple of new families, each with its own peculiarities. The first part of this thesis was initially motivated by the irregular shape of the (1726) Hoffmeister asteroid family. In an effort to explain this peculiarity we carried out a thorough dynamical analysis of its past evolution and found out that none of the mechanisms known to affect the orbits of asteroids could explain it. Investigating further we discovered that the linear nodal secular resonance with the most massive asteroid (1) Ceres, is the mechanism responsible for the anisotropic inclination distribution of Hoffmeister family members. Having established the importance of the nodal secular resonance with Ceres, we sought to expand on the subject with the study of all linear secular resonances, nodal and periapsidal, involving not only (1) Ceres, but (4) Vesta, the second most massive asteroid, as well. To do so we utilized numerical integrations of test particles across the whole Main Belt, and evaluated the impact of these resonances on their orbits. Furthermore we identified all asteroid families crossed by one or more of these resonances. Two of these cases, the families of (1251) Seinajoki and (1128) Astrid were then studied in more detail, confirming the importance of the previously ignored secular resonances with massive asteroids. The second part details the discovery of two new asteroid families. The first one, that of (326) Tamara family, was motivated by the unexpectedly high number of dark asteroids in the Phocaea region, a part of the inner Main Belt which is expected to consist mostly of bright ones. Using all available physical data we were able to show that most of the dark asteroids therein belong to a single dynamical family, which we then further analyzed finding that it is 264 ± 43 Myrs old and that it could have a significant contribution to the influx of small dark asteroids toward the Near Earth region. The second discovered family, that of (633) Zelima, is a small cluster, sub-family of the large (221) Eos family. After identifying its members, we derived the age of the Zelima family, which turned out to be only about 3.66 Myrs. en_US
dc.description.provenance Submitted by Slavisha Milisavljevic (slavisha) on 2019-01-23T14:49:57Z No. of bitstreams: 1 Tsirvoulis_Georgios.pdf: 76519001 bytes, checksum: fb8689e6372335d7f62a2788ba1cdea6 (MD5) en
dc.description.provenance Made available in DSpace on 2019-01-23T14:49:57Z (GMT). No. of bitstreams: 1 Tsirvoulis_Georgios.pdf: 76519001 bytes, checksum: fb8689e6372335d7f62a2788ba1cdea6 (MD5) Previous issue date: 2019 en
dc.language.iso en en_US
dc.publisher Beograd en_US
dc.title SECULAR DYNAMICS OF SELECTED ASTEROID FAMILIES en_US
mf.author.birth-date 1987
mf.author.birth-place Katerini en_US
mf.author.birth-country Greece en_US
mf.subject.area Astronomy en_US
mf.subject.keywords asteroids, dynamics, families, resonances en_US
mf.subject.subarea Planetary astronomy en_US
mf.contributor.committee Novaković, Bojan
mf.contributor.committee Knežević, Zoran
mf.contributor.committee Tsiganis, Kleomentis
mf.contributor.committee Kovačević, Andjelka
mf.university.faculty Mathematics faculty en_US
mf.document.pages 159 en_US
mf.document.location Beograd en_US
mf.document.genealogy-project No en_US
mf.university Belgrade en_US

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