PERIODIC ORBIT FAMILIES IN THE GRAVITATIONAL FIELD OF IRREGULAR-SHAPED BODIES

PERIODIC ORBIT FAMILIES IN THE GRAVITATIONAL FIELD OF IRREGULAR-SHAPED BODIES
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不规则形状天体引力场中的周期轨道族

DOI:
10.3847/0004-6256/152/5/137
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发表时间:
2016-10
影响因子:
5.3
通讯作者:
Baoyin Hexi
Baoyin Hexi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jiang Yu;Baoyin Hexi

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过去几年,双星和三星小行星的发现以及对小天体执行的太空任务,使人们越来越关注不规则形状天体周围的周期性轨道。在目前的工作中,我们采用多面体形状模型来准确表示不规则形状的物体,并利用该模型来计算它们相应的引力势和有效势。我们还研究了周期轨道族的特征和周期轨道的延续性。我们证明了一个事实,它提供了一个守恒量,可以限制不规则形状物体周围固定能量曲面中的周期轨道数量。在围绕 1P/哈雷彗星的周期轨道持续运行期间,Floquet 倍增器的碰撞得以维持。还讨论了不规则形状物体的周期轨道族中的多个分岔。在小行星 216 Kleopatra 周围发现了周期轨道族中的三个分岔,其中包括两个真正的鞍形分岔和一个倍周期分岔。
The discovery of binary and triple asteroids in addition to the execution of space missions to minor celestial bodies in the past several years have focused increasing attention on periodic orbits around irregular-shaped celestial bodies. In the present work, we adopt a polyhedron shape model for providing an accurate representation of irregular-shaped bodies and employ the model to calculate their corresponding gravitational and effective potentials. We also investigate the characteristics of periodic orbit families and the continuation of periodic orbits. We prove a fact, which provides a conserved quantity that permits restricting the number of periodic orbits in a fixed energy curved surface about an irregular-shaped body. The collisions of Floquet multipliers are maintained during the continuation of periodic orbits around the comet 1P/Halley. Multiple bifurcations in the periodic orbit families about irregular-shaped bodies are also discussed. Three bifurcations in the periodic orbit family have been found around the asteroid 216 Kleopatra, which include two real saddle bifurcations and one period-doubling bifurcation.
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