太阳系内部分天然卫星的高精度天体测量研究
文献类型：学位论文
| 作者 | 鄢玉荣 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007-06-07 |
| 授予单位 | 中国科学院上海天文台 |
| 授予地点 | 上海天文台 |
| 导师 | 唐正宏 |
| 关键词 | 自然卫星 CCD 精密定位 数字图像处理 多项式拟合 土卫九 海卫一 |
| 其他题名 | The Study of Accurate Positioning of the Satellites in the Solar system |
| 中文摘要 | As the rapid development of exploration of the outer space, people are paying more attention to its environment, including the small celestial bodies of the solar system. At the same time, to match the development of the orbit theory of these satellites, we need more high accuracy observations of the satellites, and accuracy must be improved. After analysis of the research on the accuracy position determination of the satellites all over the world, the main purpose of this thesis is to study the method of centering the positions of the fainter satellites near a bright primary and to present the results of the observations of the Phoebe and Triton. The main works and conclusions are as follows: 1. As we are measuring the center positions of the satellites which are near a bright primary, the center positions will be shifted as the effect of the halo light of the bright primary. Many methods have been proposed to solve this problem before. Basing on their studying, we have gone further into the study of “Polynomial-fit” method, after the research of the simulation data, we found that 5-degree polynomial model is useful under any observations. The range of the application of the 1-degree polynomial model is limited. The accuracy of the 2-degree polynomial model is unsteady. In the paper, we have showed the results of the application on the simulation data, we consider them as a direction on actual observations. 2. A part of the satellites in Solar system, such as Phoebe and Triton, have special orbits, in which we can find the clue of evolvement of the Solar system. In resent years, we have obtained a great deal of observations of Phoebe and Triton with the help of the 1.56m telescope on SHAO. To learn from the analysis that, on one hand, in order to improve the accuracy of the measured positions of the images of the satellites on the CCD, the Astrometrica and IRAF software are suggested to use together for fainter satellites, while only Astrometrica software is need for brighter satellites. On the other hand, the up-to-data catalogue of stars UCAC2 is chosen to ensure a proper astrometrica calibration during the reduction. |
| 英文摘要 | 随着空间探测事业的迅速发展，人们对包括太阳系内小天体在内的外空间环境给予了越来越多的关注。同时，随着大行星卫星运动理论研究工作的深入开展，对自然卫星的位置观测的精度提出了更高的要求。 本硕士学位论文是在对国内外自然卫星精密定位工作进行了调查研究的基础上，针对亮星附近暗弱卫星的精密定位方法和太阳系内部分的具有特殊轨道的自然卫星，土卫九和海卫一的高精度天体测量两个方面展开了相关的研究工作。主要工作和结论如下： 1.对亮星附近的暗弱卫星进行高精度的定位测量时，由于亮星光晕的影响测量所得的暗弱卫星的中心位置总是向着亮星中心方向偏移，影响暗弱卫星的中心定位精度。针对这一现象，历史曾有许多的学者提出了各自的解决方案。文章在对前人研究方法的基础上，进一步的对“多项式”拟合亮星光晕的方法进行了研究，并通过对模拟数据的详细分析,研究发现，最高阶次为5次的多项式已经完全可以满足各种观测情况的要求，修正亮星光晕对暗弱卫星定位精度的影响，1次多项式适用范围非常有限，2次多项式模型受到观测具体情况的影响很大，3次以上多项式模型归算的精度较稳定。对于各种多项式模型在具体哪些观测情况下是适用的，文章中给出了系统的介绍，可以作为实际观测资料处理的参考。 2.太阳系内的部分自然卫星，如土卫九和海卫一，它们具有特殊的逆行轨道，隐含着太阳系的最初形成之谜。因此，对这些目标进行高精度的天体测量观测具有重要的意义。借助于上海佘山站的1.56m反射式望远镜，我们观测获取了大量的土卫九和海卫一的观测资料，文章将对部分资料的处理过程及其结果进行了较详细的介绍与分析。研究发现，一方面，在量度坐标测量软件上，对于星等较暗的卫星，如土卫九，建议采用Astrometric软件和IRAF软件相结合的方法进行测量，而对于如海卫一等较亮的卫星，就可以直接采用Astrometric进行测量。另一方面，对于自然卫星的位置归算，则需统一借助于目前高精度和高密度的UCAC2参考星表。 |
| 语种 | 中文 |
| 公开日期 | 2011-07-01 |
| 页码 | 56 |
| 源URL | [http://119.78.226.72//handle/331011/14680]  |
| 专题 | 上海天文台_中国科学院上海天文台学位论文 |
| 推荐引用方式 GB/T 7714 | 鄢玉荣. 太阳系内部分天然卫星的高精度天体测量研究[D]. 上海天文台. 中国科学院上海天文台. 2007. |
入库方式： OAI收割
来源：上海天文台
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