Developments in astrometry and their impact on astrophysics and geodynamics : proceedings of the 156th Symposium of the International Astronomical Union held in Shanghai, China, September 15-19, 1992
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書誌事項
Developments in astrometry and their impact on astrophysics and geodynamics : proceedings of the 156th Symposium of the International Astronomical Union held in Shanghai, China, September 15-19, 1992
（Symposium / International Astronomical Union, no. 156）
Kluwer Academic, c1993
- alk. paper
- : pbk
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Includes index
内容説明・目次
- 巻冊次
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alk. paper ISBN 9780792322375
内容説明
The following topics are addressed: space astrometric missions, ground based optical techniques, very long baseline interferometric (VLBI) techniques, impact of these techniques on astrophysics and on geodynamics, and issues related to celestial and terrestrial reference frames. In the area of space optical astrometry, the reduction of one year of data from the Hipparcos mission shows excellent results for more than 40,000 stars. Recent developments in ground-based optical astrometry are concentrated on CCB meridian circles and transit instruments. The VLBI technique is the most powerful method to determine the earth rotation parameters, nutation series, and baseline lengths. More accurate celestial and terrestrial reference frames are needed and recent achievements in this field are presented, for example FK5 catalogues and a comparison of VLA and Hipparcos positions.
目次
Historical Remarks. Resolutions Adopted. Space Optical Astrometry. Ground-Based Optical Astrometry Very Long Baseline Interferometry (VLBI). Impact on Astrophysics. Impact on Geodynamics. Celestial Reference Frame. Terrestrial Reference Frame. Miscellaneous.
- 巻冊次
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: pbk ISBN 9780792322382
内容説明
In this review talk, I would like to report on the proper motion analysis, which has been recently carried out together with M. Soma and M. Yoshizawa: There has been a persistent demand in astronomy for accurate stellar positions and proper motions, which are represented by an inertial reference system constructed on the basis of a set of consistent astronomical constants. In the reference system the precessional constant plays a primary role. In a series of papers Fricke (1967a,b, 1977a,b) has deter mined the luni-solar precessional correction to Newcomb's value and the fictitious motion of the equinox, which have been adopted in the "IAU (1976) System of Astronomical Con stants". Based on the precessional correction and the equinoctial motion thus established, the fundamental reference system, the FK5 system (Fricke et al. 1988) for positions and proper motions, has been constructed. However, for several years geodetic VLBI (McCarthy & Luzum 1991) and LLR (Williams et at. 1991) observations have been suggesting an additional correction to the luni-solar precessional constant of the IAU (1976) System. That is, these observations indicate the precessional correction of 6. p ~ -0:'30/cent to the FK5 system. But, the observational period ofthe earth orientation is considered to be still insufficient to separate unambiguously the precessional change of the earth orientation from the nutation with the longest period of 18. 6 years.
目次
Preface and Highlights. Historical Remarks. Resolutions Adopted. Space Optical Astrometry. Ground-Based Optical Astrometry. Very Long Baseline Interferometry (VLBI). Impact on Astrophysics. Impact on Geodynamics. Celestial Reference Frame. Terrestrial Reference Frame. Miscellaneous. Author Index.
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