CSAO和VSNIIFTRI等高仪合作观测纲要和试观测初步结果

ＣＳＡＯ和ＶＳＮＩＩＦＴＲＩ１９９３年秋正式签订了将陕台ＰＨＡＩ搬去伊尔库次克进行国际合作观测、研究的协议．为了执行此项合作协议，首先对仪器进行了改造，使其能工作在Ｚ＝４５°的等高圈上；同时编制了适合于伊尔库次克纬度和新天顶距的观测纲要，全纲要共包括１２个星组，含６６８星次。其中ＦＫＳ基本星为３２４星次；ＦＫＳ扩展星和补编星为３４４星次；两次过等高圈的有２０３颗星，一次过等高圈的有２６２颗星，极限星等为９．５ｍ．恒星的赤纬分布在＋８．９°～＋７４．４°之间，赤纬跨度达６５．５°，在此赤纬带内可以消除赤其测定中的盲区．     

2.4m望远镜观测目标查询系统的建立

为提高观测效率,节约运行成本,云南天文台将建立一套2.4 m望远镜远程观测系统.2.4 m望远镜观测目标查询系统作为远程观测系统的一个重要组成部分,它支持国际虚拟天文台通用的VOTable格式;它提供丰富的星表检索,并生成模拟星图和目标列表,同时还具备了交叉证认,距离计算等辅助功能.     

中俄等高仪国际合作第一期星表与国内其它等高仪星表的比较

PHAI已在俄罗斯伊尔库茨克进行了一年半的观测,获得了1146组观测资料．根据这些观和资料编算出第一期光电等高仪星表。为了说明这期星表的情况,本文特将它与国内几本光电等高仪星表进行比较。     

Rhombic Cell Analysis - A New Way of Probing the Large- Scale Structure of the Universe. I.General Considerations

A new way of probing the harge-scale structure of the universe is proposed.Space is partitioned into cells the shape of rhombic dodecahedron.The cells are labelled “filled“ or “empty“ according as they contain galaxies or not ,the cell size is so chosen as to have narly equal numbers of filled and empty cells for the given galaxy sample.Two observables on each cell are definable:the number of ist like neighbors,n1,and a two-suffixed topological type τ,the suffixes being the numbers of its like and unlike neighbor-groups.The frequency distributions of n1 and τ in the observed set of filled(empty)cells are then considered as indicators of the morphology of the set,The method is applied to the CfA catalogue of galaxies as an illustration.Despite its limited size,the data offers evidence 1) that the empty cells are more stongly clustered than the filled cells,and 2) theat the filled cells,but not the empty cells,have a tendency to occur in sheets,Further directions of development both in theory and application are indicated.     

Normalized evaluation of the performance,capacity and availability of catalogue services: a pilot study based on INfrastruture for SPatial InfoRmation in Europe

Geographic information has a great potential to be re-used when supported by mechanisms for its discovery. Above all, the quality of a catalogue service is the key feature supporting users in the discovery process. So far, there have been in existence various methodologies dealing with the normalized evaluation of quality with respect to catalogue services. Their biggest weakness seems to be in the depth of quality testing, i.e. some influences are beyond the scope of evaluation of these methodologies with respect to quality in catalogue services. In this study, the quality of 45 catalogue services across Europe was verified with the proposed normalized evaluation methodology originating from documents within the INfrastruture for SPatial InfoRmation in Europe (INSPIRE) framework. This paper discusses the (statistical) influence of factors that may significantly change the results of catalogue service testing. The proposals for improving the existing INSPIRE normalized evaluation procedure are applicable for any spatial data infrastructure and/or Digital Earth component using the Open Geospatial Consortium Catalogue Service for the Web as a basis.     

The establishment of a continuous declination system with photoelectric astrolabe Mark I—An international cooperation between Lintong and Irkutsk

We propose a cooperative observational project of using the photo-electric astrolabe Mark I of Shaanxi Observatory in Irkutsk. As the instrument will be equipped with a Z = 45° angle prism, it will have no blind zone when used at latitude (φ = 52°. Important contribution can be expected to the establishing of fundamental reference system and the maintenance of the Hipparcos Catalogue system.     

光电等高仪I型的国际合作总结

中国科学院陕西天台和俄罗斯东西伯利亚物理技术和无线电测量研究所之间所进行光电等高仪I型的国际合作持续了5年，共完成3个纲要的观测。根据这些观测资料，编算出包括817颗星的无赤纬盲区的等高仪星表和24颗射电星的星表。在此对不同的系统差进行了分析。     

CSAO和VS NIIFTRI等高仪国际合作观测精度的初步分析

初步分析了PHAI在伊尔库茨克近14个月中观测的832组星的精度。PHAI创造了它历史上最多的观测星组数和最高的观测精度，1996年在俄罗斯地球自转参数服务系统中获取15％的权重，约为该系统平均仪器权重的3倍多。     

The General Catalogue of Photoelectric Astrolabe Stars (GCPA) based on the Chinese photoelectric astrolabe system

The General Catalogue of Photoelectric Astrolabe Stars (GCPA) based on the Chinese photoelectric astrolabe system is described. It is a combined system of right ascension and declination synthesized from four primitive star catalogues' obtained with the photoelectric astrolabe. Four other primitive catalogues obtained with the Danjon astrolabe are reduced to the combined system and added to it. GCPA contains 1579 stars, 1541 Δα values and 1131 Δδ values. The overall average accuracy is ±3.3 ms in Δα, and ±0″.058 in Δδ; for the FK4 stars, the corresponding values are ±2.3 ms and ±0″.042. FK4 stars observed by two or more instruments gave 485 Δα values and 349 Δδ values, with external accuracies ±3.8 ms and ±0″.041. Corrections to the FK4 system as determined by GCPA are given and a comparison with the relevant catalogues is presented.     

Determination of proper motions for AC stars: First results

Proper motions of the stars of the Astrographic Catalogue are being derived, using the Hubble Space Telecope Guide Star Catalogue as second epoch. Results on the San Fernando and Cordoba AC zones are presented. Identification with GSC stars (i.e. determination of proper motion) was successful for 97 percent of all AC stars. Comparison of the proper motions thus derived with those of Preliminary PPM South shows that the accuracy is about 0.8 to 0.9 arcsec per century. Thus we can derive proper motions for about 4 million stars, with an accuracy higher than that of the SAO Catalogue.