报告题目：Motions of Celestial Bodies in the 1:1 Mean Motion Resonance

报 告 人：Rudolf Dvorak教授
　　　　　　  Institute of Astronomy, University of Vienna, AUSTRIA

摘　  要：After a short introduction into the problem I will speak about the Trojans in our Solar System, where we have knowledge of thousands of bodies orbiting around the equilibrium points L_4 and L_5 of Jupiter. Only recently Trojans of Neptune and also of the Earth have been discovered.

The major part of my talk is devoted to so-called exchange orbits of different types, where we can distinguish between 'a-types' (like Janus and Epimetheus, the two Moons in the satellite system of Saturn) and 'e-types' (where two massive bodies exchange their eccentricity).

I will conclude with the 'three Trojan-problem', a very special case of motions in the 1:1 resonance.

时　  间：2012年9月21日（星期五）上午10:30

地　  点：苏富特 一楼 会议室

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　　　　　　　　　　　　　　　　　　　　　　　  南京大学天文与空间科学学院