测定天文大气折射和建立电磁波折射延迟实测模型(Ⅱ)——采用依巴谷星表作为工作星表  

Determining the Astronomical Refraction and Building the Radio Wave Refractive Delay Model Measured(Ⅱ)——Using Hipparcos Catalogue as Working Catalogue

作　　者：铁琼仙[1] 杨磊[1] 李彬华[2] 张捍卫[1] 冒蔚[1] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011 [2]昆明理工大学,云南昆明650051

出　　处：《天文研究与技术》2005年第4期246-251,共6页Astronomical Research & Technology

摘　　要：叙述了测定大气折射对工作星表的要求和星表系统误差的影响,并通过FK5星表相对于依巴谷星表的系统误差,来说明以往的各种基本星表都不适用的原因;文章说明了依巴谷星表所列星位置不含随天区而异的系统误差的特性,分析了该星表问世时的精度和十多年后的今天仍能达到的精度,说明它可以作为这种测定的工作星表,从而为直接测定天文大气折射值和折射率差提供了一个重要的条件;文章还介绍了依巴谷星表的星等分布,认为只需选用亮于6mag的依巴谷星,这一星等范围,为制定专用测量仪器终端的设计方案提供了依据。Demands on the working catalogue when determining the astronomical refraction and influences of systematic error of the catalogue are related. And the systematic error of the FK5 with respect to Hipparcos Catalogue is put forward so as to explain why all the eariler star catalogues are inapplicable to refraction measurement. The characteristic of the Hipparcos positions is illustreated in the paper, of which there is no systematic error varied with change in sky area. After the accuracies of the Catalogue at the beginning of its being published and at present time after 10 years more of its being published are analyzed, it can be concluded that the Catalogue can be used as a working catalogue in the refraction measurement. This result is an important condition for determining directly the refraction and the refractivity. Furthermore, magnitude distribution in Hipparcos Catalogue is discussed. From the discussion we conclude that Hipparcos stars brighter than 6 magnitudes are adequate to the measurement. This range of magnitude provides a basis to draw up a design plan of terminal equipment in a special measuring instrument.

关 键 词：FK5星表 依巴谷星表 系统误差 工作星表 

分 类 号：P114[天文地球—天文学]