Astronomical and astrophysical objectives of sub-milliarcsecond optical astrometry : proceedings of the 166th Symposium of the International Astronomical Union, held in the Hague, the Netherlands, August 15-19, 1994
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書誌事項
Astronomical and astrophysical objectives of sub-milliarcsecond optical astrometry : proceedings of the 166th Symposium of the International Astronomical Union, held in the Hague, the Netherlands, August 15-19, 1994
（Symposium / International Astronomical Union, no. 166）
Kluwer Academic, c1995
- : pbk.
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Includes indexes
内容説明・目次
- 巻冊次
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ISBN 9780792334422
内容説明
This text records the recent events in the development of astrometry. The results of space missions in astrometry, Hipparcos and some results from the Hubble Space telescope are presented. Combined with ground-based results, this provides astrometry results at milliarcsecond resolution. At the same time, the extragalactic reference frame, based on very long baseline interferometry radio positions, is being introduced as the fundamental reference frame. It is now also evident that future optical interferometry space missions can provide an additional improvement in future of orders of magnitude. In addition to presenting the results, the text also discusses different applications based on such accurate astrometric positions.
目次
1: Current Advances in Astrometry. 1.1. Developments in Ground-Based Astrometric Techniques and Large Catalogues. 1.2. Space Missions. 1.3. Extragalactic Reference Frame. 2: Current and Future Needs for Very Accurate Astrometry. 2.1. Stellar Astrophysics. 2.2. Galactic Populations, Kinematics and Dynamics. 2.3. Extragalactic Astrometry. 2.4. Reference Frames and Solar System. 3: Expected Developments in High Precision Astrometry.
- 巻冊次
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: pbk. ISBN 9780792334439
内容説明
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 the dynamical reference frame of the solar system with accuracies of 100 milliarcseconds to a space-fixed, extragalactic reference frame with accuracies of one milliarcsecond. Future astrometric observations should be in the 1 -100 milliarcsecond accuracy range. There are a number of concepts for future astrometric instruments in space. Most of these can provide sub-milliarcsecond astrometric accuracies.
目次
Preface. 1: Current Advances in Astrometry. 1.1. Developments in Ground-Based Astrometric Techniques and Large Catalogues. 1.2. Space Missions. 1.3. Extragalactic Reference Frame. 2: Current and Future Needs for Very Accurate Astrometry. 2.1. Stellar Astrophysics. 2.2. Galactic Populations, Kinematics and Dynamics. 2.3. Extragalactic Astrometry. 2.4. Reference Frames and Solar System. 3: Expected Developments in High Precision Astrometry. 4: Conclusions. Index. Author Index.
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