Published online by Cambridge University Press: 12 April 2016
The preliminary astrometric and photometric results obtained from the first 30 months of HIPPARCOS data are presented. Examples of the results obtained for the various categories of pulsating variables included in the HIPPARCOS programme are given. The perspectives opened by GAIA (Global Astrometric Interferometer for Astrophysics), the concept for an astrometric interferometer submitted in September 1994 to the ESA Horizon 2000+ survey committee, are briefly exposed.
Based on observations made with the ESA HIPPARCOS satellite, and on work performed within the INCA, NDAC and FAST Consortia