Proceedings of the International Astronomical Union最新文献_第3页

The current orbit of Atlas (SXV) 阿特拉斯的当前轨道(SXV)

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001319

Demétrio Tadeu Ceccatto, N. Callegari, Adrián Rodríguez

{"title":"The current orbit of Atlas (SXV)","authors":"Demétrio Tadeu Ceccatto, N. Callegari, Adrián Rodríguez","doi":"10.1017/S1743921321001319","DOIUrl":"https://doi.org/10.1017/S1743921321001319","url":null,"abstract":"Abstract With the success of the Cassini-Huygens mission, the dynamic complexity surrounding natural satellites of Saturn began to be elucidated. New ephemeris could be calculated with a higher level of precision, which made it possible to study in detail the resonant phenomena and, in particular, the 54:53 near mean-motion resonance between Prometheus and Atlas. For this task, we have mapped in details the domains of the resonance with dense sets of initial conditions and distinct ranges of parameters. Our initial goal was to identify possible regions in the phase space of Atlas for which some critical angles, associated with the 54:53 mean motion have a stable libration. Our investigations revealed that there is no possibility for the current Atlas orbital configuration to have any regular behavior since it is in a chaotic region located at the boundary of the 54:53 mean-motion resonance phase space. This result is in accordance with previous works (Cooper et al. 2015; Renner et al. 2016). In this work, we generalize such investigations by showing detailed aspects of the Atlas-Prometheus 54:53 mean-motion resonance, like the extension of the chaotic layers, the thin domain of the center of the 54:53 resonance, the proximity of other neighborhood resonances, among other secondary conclusions. In particular, we have also shown that even in the deep interior of the resonance, it is difficult to map periodic motion of the resonant pair for very long time spans.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"166 10 1","pages":"120 - 127"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83330464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Planetary and lunar ephemeris EPM2021 and its significance for Solar system research 行星和月球星历EPM2021及其对太阳系研究的意义

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001447

E. Pitjeva, D. Pavlov, D. Aksim, Margarita Kan

引用次数: 3

Four- and five-body periodic Caledonian orbits 四体和五体周期加里东轨道

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001265

Valerie Chopovda, W. Sweatman

引用次数: 0

Families of periodic orbits around asteroids: From shape symmetry to asymmetry 小行星的周期轨道族:从形状对称到不对称

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S174392132100123X

G. Voyatzis, D. Karydis, K. Tsiganis

引用次数: 0

Closed-form perturbation theory in the Sun-Jupiter restricted three body problem without relegation 太阳-木星限制三体问题的闭型微扰理论

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001356

I. Cavallari, C. Efthymiopoulos

引用次数: 0

Secular dynamics in extrasolar systems with two planets in mutually inclined orbits 两颗行星在相互倾斜的轨道上运行的太阳系外系统的长期动力学

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001368

Rita Mastroianni, C. Efthymiopoulos

引用次数: 0

Orbit propagation around small bodies using spherical harmonic coefficients obtained from polyhedron shape models 利用多面体形状模型得到的球谐系数进行小天体轨道传播

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001496

P. Peñarroya, R. Paoli

{"title":"Orbit propagation around small bodies using spherical harmonic coefficients obtained from polyhedron shape models","authors":"P. Peñarroya, R. Paoli","doi":"10.1017/S1743921321001496","DOIUrl":"https://doi.org/10.1017/S1743921321001496","url":null,"abstract":"Abstract Missions to asteroids have been the trend in space exploration for the last years. They provide information about the formation and evolution of the Solar System, contribute to direct planetary defense tasks, and could be potentially exploited for resource mining. Be their purpose as it may, the factor that all these mission types have in common is the challenging dynamical environment they have to deal with. The gravitational environment of a certain asteroid is most of the times not accurately known until very late mission phases when the spacecraft has already orbited the body for some time. Shape models help to estimate the gravitational potential with a density distribution assumption (usually constant value) and some optical measurements of the body. These measurements, unlike the ones needed for harmonic coefficient estimation, can be taken from well before arriving at the asteroid’s sphere of influence, which allows to obtain a better approximation of the gravitational dynamics much sooner. The disadvantage they pose is that obtaining acceleration values from these models implies a heavy computational burden on the on-board processing unit, which is very often too time-consuming for the mission profile. In this paper, the technique developed on [1] is used to create a validated Python-based tool that obtains spherical harmonic coefficients from the shape model of an asteroid or comet, given a certain density for the body. This validated software suite, called AstroHarm, is used to analyse the accuracy of the models obtained and the improvements in computational efficiency in a simulated spacecraft orbiting a small body. The results obtained are shown offering a qualitative comparison between different order spherical harmonic models and the original shape model. Finally, the creation of a catalogue for harmonics is proposed together with some thoughts on complex modelling using this tool.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"39 1","pages":"203 - 210"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88413895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of the stability for trajectories exterior to Jupiter in the restricted three-body problem via closed-form perturbation theory 用闭型微扰理论表征受限三体问题中木星外轨道的稳定性

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001253

Mattia Rossi, C. Efthymiopoulos

引用次数: 1

Dynamical constraints on the evolution of the inner asteroid belt and the sources of meteorites 内小行星带演化的动力学约束与陨石来源

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S174392132100140X

S. Dermott, Dan Li, A. Christou

引用次数: 0

The semi-analytical motion theory of the third order in planetary masses for the Sun – Jupiter – Saturn – Uranus –Neptune’s system 太阳-木星-土星-天王星-海王星系统行星质量三阶半解析运动理论

Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/s1743921322000126

A. Perminov, E. Kuznetsov

引用次数: 0