| 星表系统差及其计算方法 |
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| 引用本文： | 李正兴.星表系统差及其计算方法[J].天文学报,1997,38(1):86-96. |
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| 作者姓名： | 李正兴 |
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| 作者单位： | 中国科学院紫金山天文台!南京，210008 |
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| 摘 要： | 本文对星表系统差的性质进行了讨论，并分析和评估了目前常用的星表系统差计算方法的优、缺点，从而提出了一个新的星表系统差计算方法．同时也提出了星表系统差计算精度的检验标准．最后对用不同方法计算的系统差进行了分析比较．结果表明，新方法的系统差计算精度好于目前常用的解析方法．
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| 关 键 词： | 基本天体测量 星表比较 系统差 |
THE SYSTEMATIC DIFFERENCES OF CATALOGS OF STARS AND THE METHOD OF CALCULATION |
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| Li Zheng-xing.THE SYSTEMATIC DIFFERENCES OF CATALOGS OF STARS AND THE METHOD OF CALCULATION[J].Acta Astronomica Sinica,1997,38(1):86-96. |
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| Authors: | Li Zheng-xing |
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| Abstract: | In this paper, a new method of determination of the systematic differences among catalogs and the FK5 is described. In this method the systematic difference in each area is represented with a surface that is obtained by fitting the errors of positions (cat-FK5) with a quadratic function. The systematic differences of positions of stars for 39 catalogs have been derived by means of the new method and the analytical method, respectively. All catalogs are converted to the FK5 system by removing the systematic differences that are obtained with different methods.Then two mean systems are calculated respectively by using least square method.Finally the mean precisions of the positions and proper motions for the systems are compared with each other.The results indicate that the precision of calculation of the new method is better than that of the analytical method. |
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| Keywords: | Fundamental astrometry Catalog comparison Systematic differences |
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