Proceedings of the RGO-ESA Workshop
    Future Possibilities for Astrometry in Space

    Cambridge, UK, 19-21 June 1995

    The proceedings of "Future Possibilities for Astrometry in Space", a workshop organised jointly by the Royal Greenwich Observatory and the European Space Agency, were published by ESA as SP-379. A pdf version of the papers can be accessed by clicking on the paper title or number below.

    Table of Contents
    Executive Summary   9
    The Scientific Organising Committee
    Welcome from the Local Organising Committee   11
    F. van Leeuwen (RGO, Cambridge)
    Welcome Address   13
    A. Boksenberg (RGO, Cambridge)
    Objectives of the Workshop   15
    M.A.C. Perryman (ESA-ESTEC)
    I1. Highlights of the Hipparcos Mission   19
    F. Mignard (Observatoire de la Cote d'Azur)
    I2. The Gaia Concept   23
    L. Lindegren (Lund) & M.A.C. Perryman (ESA-ESTEC)
    Session A: Scientific Aspects
    Chair: F. van Leeuwen
     
    A1. The Scientific Goals of Gaia Remarks   35
    M.A.C. Perryman (ESA-ESTEC) & L. Lindegren (Lund)
    A2. What to Expect from Observations of Solar System Objects with Gaia   41
    D. Hestroffer & B. Morando (Bureau des Longitudes, Paris)
    A3. Astrometric Detection of Extra-Solar Planets with Gaia   47
    S. Castertano (STScI), M.G. Lattanzi (Torino) & M.A.C. Perryman (ESA-ESTEC)
    A4. Finding Planets and Brown Dwarfs with Gaia   55
    H.-H. Berstein & U. Bastian (ARI, Heidelberg)
    A5. The Solar Neighbourhood and Beyond   61
    C.A. Murray (Eastbourne)
    A6. Statistical Aspects of Astrometry and their Implications for High-Precision Measurements   65
    R. Wielen (ARI, Heidelberg)
    A7. Some Thoughts about the Photometric System of Gaia   69
    J.W. Pel (Kapteyn Institute, Groningen)

    A8. High Accuracy Astrometry of Star Clusters and Associations

    		   71

    I. PLatais (Yale), F. van Leeuwen (RGO) & J.-C. Mermilliod (Lausanne)
    A9. Globular CLusters & Dwarf Spheroidals: from Internal Dynamics to the Mass of the Galaxy   77
    H.-J. Tucholke & P. Brosche (Bonn)
    A10. Some Aspects of the Gaia Concept with Respect to Pulsating Stars   83
    M.O. Mennessier & D. Barthes (Montpellier)
    A11. An Improvement of our Knowledge about B and Be Stars using Gaia   87
    D. Briot, A.M. Hubert, F. Vakili, M. Floquet & H. Hubert
    A12. Low-Mass Stars: A Sharper View of the Solar Neighbourhood   91
    F. Crifo (Observatoire de Paris) & T. Forveille (Grenoble)
    A13. Key Questions in Galactic Structure with Astrometric Answers   95
    G. Gilmore (IoA, Cambridge) & E. Høg (Copenhagen)
    A14. Direct Detection of the Sun's Galactocentric Acceleration   99
    U. Bastian (ARI, Heidelberg)
    A15. An Oval Stream Model of K-M Giants in the Galactic Disk   101
    T. Tsujimoto & M. Miyamoto (NAO, Tokyo)
    A16. Statistical Relation between Apparent and Absolute Magnitudes of Stars in a Disk   105
    E. Schilbach & N.V. Kharchenko (Potsdam)
    A17. Gaia: A new Era for Cosmic Distance Scale Determination   109
    C. Turon (Observatoire de Paris-Meudon)
    A18. Direct Detection of Gravity Waves through High Precision Astrometry   113
    R. Fakir (University of British Colombia)
    A19. Gravitational Waves as Astrometric Targets   117
    V.V. Makarov (Copenhagen)
    A20.A Desideratum of Astrometry for Gravitational Microlensing Events   121
    M. Miyamoto (NAO, Tokyo) & Y. Yoshii (University of Tokyo)
    A21. Observation of Microlensing by an Astrometric Satellite   125
    E. Høg (Copenhagen)
    A22. Linking Gaia Proper Motions to the Extragalactic Reference System by QSO Observations   127
    E. Schilbach & R.-D. Scholtz (Potsdam)
    A23. Summary of the Parallel Session   131
    F. van Leeuwen (RGO, Cambridge)
    Session B: Auxiliary Observations
    Chair: G. Gilmore
     
    B1. Potential Applications of GSC-II for Gaia Operations   137
    B.M. Lasker, B.J. McLean, H. Jenkner (STScI); M.G. Lattanzi & A. Spagna (Torino)
    B2. Schmidt Plate Astrometry and the Preparation of a Gaia Input Catalogue   143
    S. Röser (ARI, Heidelberg), E. Schilbach & S. Hirte (Potsdam)
    B3. The Magellanic Catalogue of Stars (MACS): an Input Catalogue of Uncrowded Stars   147
    H.-J. Tucholke (Bonn)
    B4. Gaia and Beyond: the Perspective from the Milliarcseconds of Huibble and Hipparcos   149
    P. Hemenway (University of Texas)
    B5. Parallel Acquisition of Radial Velocities abd Metallicities for a Gaia-Type Mission   153
    F. Favata & M.A.C. Perryman (ESA-ESTEC)
    B6. 100 Million Radial Velocitoies: How to Get Them   165
    U. Bastian (ARI, Heidelberg)
    B7. Automated Spectral Classification and the Gaia Project   169
    J. LaSala (University of Southern Maine) & M.J. Kurtz (CfA, Harvard)
    B8. Morphological Classification of Galaxies with Artificial Neural Networks   173
    A. Naim (IoA, Cambridge)
    B9. Spectral Classification of Galaxies   177
    S. Folkes & O. Lahav (IoA, Cambridge)
    B10. Summary of the Parallel Session   181
    G. Gilmore (IoA, Cambridge)
    Session C: Technological Aspects
    Chair: L. Lindegren
     
    C1. A Fizeau Optical Interferometer Atrometric Satellite   187
    P.K. Seidelmann (USNO) et al.
    C2. An Optimum Eight-Colour Photometric System for a Survey Satellite   191
    V. Straizys (Vilnius) & E. Høg (Copenhagen)
    C3. An Ultraviolet Option for a Future Astrometric Satellite   197
    V.N. Yershov (Pulkovo Observatory)
    C4. Orbit Options for an Interferometric Astrometry Mission   201
    W. Flury & J. Rodriguez-Canabal (ESOC)
    C5. A Superconducting Detector for a Future Space Astrometry Mission   207
    M.A.C. Perryman & A. Peacock (ESA-ESTEC)
    C6. Direct Fringe Detection and Sampling of the Diffracion Pattern   209
    G. Daigne (Observatoire de Bordeaux)
    C7. On the Advantages of Dispersed Fringes   213
    J.E. Noordam (NFRA, Dwingeloo)
    C8. Obtaining Spectral Information from an Astrometric Interferometry Mission   217
    Y. Rabbia (Observatoire de la Cote d'Azur)
    C9. Some Designs of the Gaia Detector System   223
    E. Høg (Copenhagen)
    C10. Non-Conventional Detector Applications for Direct Focal Plane Coverage   231
    M. Gai, M.G. Lattanzi, S. Casertano & M.D. Guarnieri (Torino)
    C11. Analysis of an Astrometric Fizeau Interferometer for Gaia   241
    S. Loiseau (Meudon) & S. Shaklan (JPL. Pasadena)
    C12. Gaia Optics: Polychromatic PSF and Pupils   251
    M. Cecconi & M.G. Lattanzi (Torino)
    C13. Three Astrometric Mission Options and a Photometric System   255
    E. Høg (Copenhagen)
    C14. Astrometric Satellite with Sunshield   263
    E. Høg (Copenhagen)
    C15. Summary of Parallel Session   267
    L. Lindegren (Lund)
    Session D: Data Acquisition
    Chair: F. Mignard
     
    D1. Scientific Analysis of Data from a Scanning Satellite   273
    C. Fabricius & E. Høg (Copenhagen)
    D2.Geometric Observation Equation for Gaia Microarcsecond Astrometry   277
    B. Bucciarelli, M.G. Lattanzi & A. Spagna
    D3. Summary of the Parallel Session   281
    F. Mignard (Observatoire de la Cote d'Azur )
    Session E: Mission Critical Aspects
    Chair: M.G. Lattanzi
    E1. Attitude Determination and Control for Microarcsecond Astronomy   285
    F. Donati (CSS, Torino)
    E2. Science and Technology: Trade-Offs in the Design of a Future Astrometric Mission   289
    S. Casertano (STScI)
    E3. Some Possible Mission Critical Aspects   293
    C. Borrows (STScI)
    E4. The Scientific Organisation of a Future Astrometry Mission   295
    M.A.C. Perryman (ESA-ESTEC)
    E5.Summary of the Parallel Session   301
    M.G. Lattanzi (Torino)