YNAO OpenIR  > 系外行星研究组
Alternative TitleDetermination of tri-axial ellipsoid shape and rotation parameters of asteroid---The observation and study of asteroid (1028) Lydina
Thesis Advisor王晓彬
Degree Grantor中国科学院研究生院(云南天文台)
Place of Conferral北京
Degree Discipline天体物理
Keyword小行星 测光观测 自转周期 自转轴指向 三轴椭球体
Abstract小行星物理参数的研究为太阳系早期环境、行星系统的形成与演化提供约束条件;此外,还可以为小行星的碰撞演化理论提供限制。目前,小行星物理参数样本数目无法满足以上两方面研究工作的需要。 CCD测光观测是获得小行星物理参数最重要的手段之一,由小行星光变曲线可以推断出小行星的自转参数和形状,从而通过流体静力学平衡可以建立小行星自转速率、形状与密度的关系,从而获得小行星密度这一很难测定的基本物理量。因此,开展小行星测光观测研究,可以扩大小行星物理参数样本数目,为小行星后续研究提供资料。 本论文的主要工作是充分利用云南天文台现有的中、小望远镜的设备优势,通过对小行星进行测光观测研究,从而获得小行星自转参数以及形状信息。在本论文中,将首先简要介绍小行星观测研究的意义以及此领域发展现状。在第二章中,讨论了引起小行星光度变化的因素。第三章主要介绍了小行星自转周期的测定方法――最小相位弥散方法,以及小行星自转轴指向以及三轴椭球体轴比的估算方法――振幅-视界角方法;并且利用振幅-视界角方法估算得到小行星(283)Emma的自转轴指向以及轴比。在第四章中讨论小行星(1028)Lydina的观测过程、数据处理以及获得自转参数和形状的结果。最后,简要的总结所获得小行星(1028)Lydina的一些结果,以及我们未来研究的方向。 随着对太阳系认识的加深,以及深空探测计划的实施,小行星物理参数的观测研究已经成为天文学中最活跃的研究领域之一。
Other AbstractThe study of asteroid physical parameters offers the constraint condition on the early environment of solar system as well as the formation and evolution of planetary system; In addition, it can also provide the restrictions on the asteroid collision evolution theory. At present, the number of the sample of asteroid physical parameters is unable to meet this need of above two problems. The CCD photometric observation is one of the most important means to obtain the physical parameters of asteroid. The rotation parameters and shape of asteroid can be inferred by its light curves. Based on the hydrostatic equilibrium theory of a spin body, the relation among asteroid rotation rate, asteroid shape and asteroid density is established, so the density of asteroid, being difficult to determine as a basic physical quantity, can be obtained. Therefore, the photometric observations are carried out in order to expand the number of the sample of asteroid physical parameters, which provides the material for the follow-up study of asteroid. Taking full advantage of the equipment superiority of medium and small telescope of the Yunnan Observatory, the rotation parameters and shape of asteroid is obtained by using the photometric data, which is the main aim of this thesis. In this paper, Section 1 introduces to the significance of asteroid observational study and the developmental status of this field. In Section 2, a few of factors, caused the brightness variation of asteroid, is discussed. Section 3 introduces to the method on the determination of asteroid rotation period—Phase Dispersion Minimum (PDM) method and the estimation method on the pole orientation of asteroid and the axial ratios of tri-axial ellipsoid—Amplitude-Aspect method; And the pole orientation and tri-axial ratios of asteroid (283) Emma is obtained by the Amplitude-Aspect method in this section. The observations process, the data reduction and the estimation result of the rotation period and shape on asteroid (1028) Lydina are discussed in Section 4. Finally, a brief summary of some results on asteroid (1028) Lydina as well as the direction of our research in future, is introduced. With the knowledge of solar system deepened and the deep-space exploration program executed, the observational study of asteroid physical parameters has become one of the most active areas in astronomy.
Subject Area天文学
Document Type学位论文
Recommended Citation
GB/T 7714
王夷博. 小行星三轴椭球体形状以及自转参数测定——小行星(1028)Lydina观测研究[D]. 北京. 中国科学院研究生院(云南天文台),2012.
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