Proceedings of the 109th Symposium of the International Astronomical Union, held in Gainesville, Florida, USA, January 9-12, 1984

Inhalt

I. Reduction Technique.- Concepts of reference systems.- Discussion of meaning and definition of UT.- Relativistic reduction of astrometric observations.- Statistical analysis of proper motion surveys.- Statistical problems encountered in using trigonometric parallaxes.- The search for unwanted signals: systematic trends in proper motions of fundamental stars.- A new technique for the analytical determination of a fundamental system of positions and proper motions.- Computation of compilation catalogs.- Brosche's method for representing systematic differences in positions and proper motions of stars.- Some effects of different sources of variation of latitude data on meridian circle catalogues.- Global reduction of fundamental astrometric data.- Application de la methode par deconvolution integree au cas des occultations d'etoiles doubles.- The conversion from the B1950 FK4-based position to the J2000 position of celestial objects.- The observations of the earth rotation and the stellar system.- II. Radio Astrometry.- The astrometric possibilities of very-long-baseline interferometry.- The precision of J2000.0 radio source positions from Mark III VLBI.- The JPL/DSN J2000 radio reference frame.- The use of the RATAN-600 radio telescope in astrometry.- The extragalactic optical/radio reference frame. A progress report, IAU Comm. 24 Working Group.- Preliminary precise radio/optical positions of selected stars.- III Photographic Astrometry.- Can a system be defined for the new edition of the Yale parallax catalogue?.- Proper motions with respect to galaxies.- Astrometry of star clusters: problems, techniques, and opportunities.- Plans for the second epoch of the southern proper motion program.- Trigonometric parallaxes obtained with the UK Schmidt telescope.- Optical counterparts of extragalactic radio sources in the southern sky: positions obtained from Schmidt plates.- A photographic astrometric telescope for Brazil.- Astrometry with the Lowell PDS.- Laser interferometer measurement system on the Yale PDS 2020G.- Instrument and method for determination of high-precision coordinates of geostationary artificial satellites.- Variations in external parallax errors.- Astrometry with objective prism.- Testing Schmidt plates for astrometric purposes.- Parallaxes with large reflectors.- Design characteristics of the 1.56 m astrometric telescope and its usage in astrometry.- Astrometric characteristics of the Abastumani Astrophysical Observatory 125 cm reflector (AZT-11) of Ritchey-Cretien optical system.- IV. Interferometry.- Speckle interferometry in astrometry.- First results from the new GSU CCD speckle camera.- Infrared speckle interferometry: A sensitive technique for physical measurements of unseen companions to nearby stars.- Microarcsecond astrometric interferometry.- Present status and future plans for the two color astrometric interferometer project.- V. Small Field Photoelectric Astrometry.- A new astrometric system.- Moving-image astrometry with the multi-anode microchannel array (MAMA) detector.- Vidicon photometry and astrometry applied to objects of the solar system.- Photoelectric astrolabe and astrolabe star catalogues.- The oscillating slit micrometer of the meridian circle PMC 190 Tokyo.- VI. Transit Circles and Astrolabes.- A new astrolabe.- Timing and data acquisition system for a field astrolabe.- The photoelectric meridian circle of the Pulkovo.- The glass meridian circle.- Design for a large transit circle with reflecting optics.- A proposal for scanning meridian circle.- Impersonal techniques of transit circle observations. "The Carlsberg automatic meridian circle".- The Bordeaux automatic transit circle: First catalogues, current and future programs.- Current work with the photoelectric transit instrument at the observatory of Torino.- The design of modern meridian circles for the observation of faint objects.- Automatic horizontal meridian circle at Pulkovo.- Automation and software of the Wanschaff vertical circle at Goloseevo.- The use of photographic positions in determining azimuth of a meridian circle.- The use of astrometric instruments in vacuum chambers.- The seven-inch transit circle and its New Zealand program.- Carlsberg automatic transit circle: first two test catalogues and the programme for La Palma.- The refurbished six-inch transit circle.- The transit instrument under optimum conditions.- Vacuum meridian marks of the Belgrade large transit instrument.- The vacuum mires of the transit instrument at Nikolaev.- Internal refraction in meridian circles.- Determination of the division corrections of the Bordeaux declination circle by the Benevides-Boczko method.- A new method of determining absolute azimuth and latitude and suggestion for a new type of meridian circle.- A new method for zenith distance determination in meridian observations.- On the implementation of absolute meridian observations in low latitude stations.- A multislit photoelectric star micrometer for the meridian circle of the Nikolayev Astronomical Observatory.- Comparison of Tokyo PZT Catalogues with AGK3 and with three other independent catalogues.- VII. Space Astronomy.- HIPPARCOS satellite and the organization of the project.- HIPPARCOS data reductions.- Preparation of the HIPPARCOS input catalogue. Astrometric programs for HIPPARCOS. Preliminary astrometric observations.- The use of Space Telescope to tie the HIPPARCOS reference frame to an extragalactic reference frame.- Tycho astrometry and photometry.- Software for space telescope astrometry.- Space telescope motion limitations for fine guidance sensor astrometry.- VIII. Objects.- The new index catalog of visual double stars-WDS.- Astrometric desiderata for nearby stars.- On desiderata for star catalogs for the remainder of the twentieth century: A report on catalog work now in progress at the U. S. Naval Observatory.- On the reference frame of the planetary ephemerides.- Comparison of instruments and methods of positional observations of the sun and major planets.- On the SRS catalogue.- The establishment of an astrometric standard region - A description of the method with reference to the astrometric standard region in Praesepe (M44).- Objets accessibles aux astrolabes de haute precision: etoiles et radioetoiles brillantes, planetes, soleil.- Astrolabe observations of radio stars at the southern hemisphere.- The guide star selection system and the guide star catalog for Space Telescope.- IX. Administration and Distribution.- Astrometry in China.- The IAU numbering system of radio sources.- The preparation and distribution of machine-readable astrometric data.- X. Connections Between the Various Techniques.- The need for better co-operation and intercomparison in fundamental astrometry.- The reconciliation of optical and radio positions.- On the feasibility of a star coordinate determination in the radio astrometry reference system.- Connection between the HIPPARCOS catalogue and the FK5.- Results of VLBI observations of radio stars and their potential for linking the HIPPARCOS and extragalactic reference frames.- Relating the JPL VLBI reference frame and the planetary ephemerides.- A fully-automated system of astrometric data collection and processing.- Concluding Remarks.- A. Excerpts from a general discussion on coordinates and time.- B. The status of the plates taken for the charts and the catalogue of the Carte du Ciel (astrographic catalogue).- C. Pictures taken during the Symposium.- Author Index.