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

  • Erik Høg
  • P. Kenneth Seidelmann

Table of contents

  1. Front Matter
    Pages i-xvi
  2. Current Advances in Astrometry

    1. Front Matter
      Pages 1-1
    2. Developments in Ground-Based Astrometric Techniques and Large Catalogues

      1. R. C. Stone, C. C. Dahn
        Pages 3-8
      2. G. F. Benedict, J. T. McGraw, T. R. Hess
        Pages 9-12
      3. Xiaopei Pan, Shri Kulkarni, Michael Shao, M. Mark Colavita
        Pages 13-18
      4. D. J. Hutter, K. J. Johnston, D. Mozurkewich
        Pages 23-29
      5. M. Yoshizawa
        Pages 31-34
      6. W. F. van Altena, T. M. Girard, I. Platais
        Pages 43-43
      7. A. R. Klemola, R. B. Hanson, B. F. Jones
        Pages 45-48
      8. S. Röser, V. V. Nesterov
        Pages 49-52
    3. Space Missions

      1. C. Turon, A. E. Gomez, D. Morin
        Pages 77-82
      2. O. Franz, K. J. Kreidl, L. H. Wasserman, A. J. Bradley, G. F. Benedict, R. L. Duncombe et al.
        Pages 87-87
      3. G. Benedict, W. Jefferys, B. McArthur, E. Nelan, A. Whipple, Q. Wang et al.
        Pages 89-94
      4. M. G. Lattanzi, R. Burg, J. L. Hershey, L. G. Taff, S. T. Holfeltz, B. Bucciarelli
        Pages 95-100
      5. T. M. Girard, Y. Li, W. F. Van Altena, J. M. Nunez, G. F. Benedict, R. L. Duncombe et al.
        Pages 101-106
    4. Extragalactic Reference Frame

      1. E. M. Standish
        Pages 109-116
      2. C. de Vegt, K. J. Johnston
        Pages 117-117
      3. J.-F. Lestrade, D. L. Jones, R. A. Preston, R. B. Phillips, J. Kovalevsky, M. Froeschle et al.
        Pages 119-126
      4. Jean Kovalevsky
        Pages 127-132
  3. Current and Future Needs for Very Accurate Astrometry

    1. Front Matter
      Pages 133-133
    2. Stellar Astrophysics

      1. Y. Lebreton, E. Michel, M. J. Goupil, A. Baglin, J. Fernandes
        Pages 135-142
      2. Ph. Stee, D. Bonneau, D. Mourard, P. Lawson, F. Morand, I. Tallon et al.
        Pages 149-155
      3. J. Liebert, C. C. Dahn
        Pages 157-162
      4. P. Thejll
        Pages 173-180
      5. O. Franz, K. J. Kreidl, L. H. Wasserman, A. J. Bradley, G. F. Benedict, R. L. Duncombe et al.
        Pages 203-203
    3. Galactic Populations, Kinematics and Dynamics

      1. James Binney
        Pages 239-246
      2. Gerard Gilmore
        Pages 251-258
      3. P. Brosche, M. Odenkirchen, H.-J. Tucholke, M. Geffert
        Pages 259-263
    4. Extragalactic Astrometry

      1. Sidney Van Den Bergh
        Pages 267-272
      2. B. E. Westerlund
        Pages 273-282
      3. T. M. Eubanks, D. N. Matsakis, F. J. Josties, B. A. Archinal, K. A. Kingham, J. O. Martin et al.
        Pages 283-283
      4. E. F. Arias, A. M. Gontier
        Pages 284-284
    5. Reference Frames and Solar System

About these proceedings


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.


astrometry astronomy astrophysics Hipparcos catalog instruments solar system Tycho catalog

Editors and affiliations

  • Erik Høg
    • 1
  • P. Kenneth Seidelmann
    • 2
  1. 1.Copenhagen University ObservatoryCopenhagenDenmark
  2. 2.U.S. Naval ObservatoryUSA

Bibliographic information

  • DOI
  • Copyright Information International Astronomical Union 1995
  • Publisher Name Springer, Dordrecht
  • eBook Packages Springer Book Archive
  • Print ISBN 978-0-7923-3443-9
  • Online ISBN 978-94-011-0069-4
  • Buy this book on publisher's site