Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007padeu..19.....e&link_type=abstract
Publications of the Astronomy Department of the Eötvös University (PADEU), 2007, ISBN 963 463 557, Vol. 19. Edited by B. Érdi a
Astronomy and Astrophysics
Astronomy
Scientific paper
In 25--27 May 2006 an International Conference on Actual Problems in Celestial Mechanics and Dynamical Astronomy was organized at Cluj-Napoca. The Faculty of Mathematics and Computer Science of the Babeş-Bolyai University, the host of this conference, organized this scientific meeting in collaboration with the Loránd Eötvös University (Budapest, Hungary), Sapientia University (Miercuria Ciuc, Romania), Astronomical Institute of the Romanian Academy (Bucharest, Romania) and Institute for Space Science (Bucharest, Romania).
The main topics covered by the meeting were:
- Solar-System dynamics, stability, resonances, chaos;
- Dynamics of populations in the Solar System: NEAs, MBAs, Centaurs, KBOs, TNOs: observations, orbits, theoretical models;
- Galactic and extragalactic dynamics;
- Problems, models, methods and techniques in contemporary celestial mechanics and dynamical astronomy.
The conference was structured into seven sessions of oral presentations, a poster session and a round table discussion. Each of the seven main sessions began with an invited lecture. These lectures reviewed the following fields: the Sitnikov problem (R. Dvorak, Austria); the age of the asteroid families (Z. Knezevic, Serbia and Montenegro); stability of exoplanetary systems (B. Érdi, Hungary); Saari's conjecture (Diacu, Canada); integrability from direct and inverse standpoints (G. Bozis, Greece); stability of exact solutions in restricted many-body problems (E. Grebenicov, Russia); actual Romanian research in post-Newtonian dynamics (V. Mioc, Romania).
Beside the invited lectures, the 21 oral presentations covered the most various domains of celestial mechanics and dynamical astronomy. Chaotic behaviour was a premier topic. It was approached and studied by analytical, geometrical and numerical methods in many astronomical problems: the restricted three-body problem (with examples in the Solar System), the Gylden's model and its generalizations, capture domain, resonances, etc.
Stability and instability were also subjects of discussions. Almost all of the communications held on this topic dealt with exoplanetary systems. But other specific astronomical fields, such as the Solar System or clusters of galaxies were presented too.
Special problems of celestial mechanics were also discussed. We can mention the elliptic restricted three-body problem, photogravitational models, the Hénon-Heiles' model, Maxwell's model for planetary rings, behaviour in the transitory regime, etc. Space dynamics was represented by contributions concerning fly-by trajectories, or EPIRB distress signal via satellite. Finally, numerical techniques and simulations, useful for the investigation of various abstract models and actual problems of celestial mechanics and dynamical astronomy, also occupied a place in the discussions.
In conclusion, the meeting tried to find a common way for the classical mechanics (quantitative, and based on real astronomical situations and models) and the 'abstract' one (qualitative, using geometric tools of the theory of dynamical systems, and often tackling less realistic models, however aimed at the global understanding of astronomical problems).
The lectures, talks and (especially) the discussions established the bases for an enlarged international cooperation within the framework of this branch of Astronomy.
This volume contains 24 contributions presented at the conference.
Erdi Bálint
Szenkovits Ferenc
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