Gaia feasibility: Current research on critical aspects

M. Gai*, F. Bertinetto, M. Bisi, E. Canuto, D. Carollo, S. Cesare, M. G. Lattanzi, G. Mana, E. Thomas, T. Viard

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)


    ESA is supporting an industrial study aimed at preliminary assessment of some critical aspects of the GAIA mission implementation: hereafter, our study approach is presented. The Fizeau interferometer of GAIA features a strict correlation between the conventional telescope and interferometer concepts and problems. The wide angle measurement concept is based on the stability of the basic angle between two macroscopic structures: the implementation is challenging. An experiment will address feasibility and performance of metrology at sub-nanometer level, over 0.5 m distance, controlling displacement and relative orientation ('tip-tilt') of two platforms, simulating optical elements of GAIA. System definition is based on the scientific rationales of GAIA; however, trade-off among competing requirements, if needed, should neither descope the mission nor push any critical parameter to its limiting values. Most of the critical aspects which arose in the Cambridge 1995 workshop on GALA are being addressed, and some viable solutions seem to be taking shape: microarcsecond global astrometry is becoming closer to implementation.

    Original languageEnglish
    Pages (from-to)835-838
    Number of pages4
    JournalEuropean Space Agency, (Special Publication) ESA SP
    Issue number402
    Publication statusPublished - 1997


    • Detectors
    • GAIA
    • Interferometry
    • Laser metrology
    • Optics


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