| 期刊全稱 | Astronomical and Astrophysical Objectives of Sub-Milliarcsecond Optical Astrometry | | 期刊簡稱 | Proceedings of the 1 | | 影響因子2023 | Erik H?g,P. Kenneth Seidelmann | | 視頻video | http://file.papertrans.cn/164/163607/163607.mp4 | | 學(xué)科分類 | International Astronomical Union Symposia | | 圖書封面 |  | | 影響因子 | Astrometry is on the threshold of great changes due to the fact that this decade, alone, is witnessing an improvement of stellar positions equivalent to the total improvement of the previous two centuries. The Hipparcos Satellite has concluded its observations, and the catalog is in preparation. Preliminary results assure that the Hipparcos catalog will provide positions, parallaxes and annual proper motions for over 100,000 stars with accuracies of 1.5 milliarcseconds. In addition, the Tycho catalog will provide positions of about 30 milliarcseconds accuracy for over 1 million stars, and annual proper motions with 3 milliarcsecond accuracy will subsequently be ob- tained by means of first epoch positions from the Astrographic Catalog. Optical interferometers on the ground are beginning operation, and these instruments can provide observational accuracies of approximately one milliarcsecond. Also, the traditional reference frame based on the Fun- damental Catalog of bright stars is being replaced by the extragalactic ref- erence frame, based on radio sources with accuracies of one milliarcsecond. Thus, astrometry will change from a fundamental reference frame defined in terms of th | | Pindex | Conference proceedings 1995 |
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