Global Dynamics and Ephemerides

Daniel Hestroffer (1) , Pedro David (1)

1 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides

When speaking of Gaia it is instructive to remember the first ESA mission dedicated to high precision astronometry HIPARRCOS launched in August 1989. HIPPARCOS can be considered as Gaia's precursor, indeed the observing strategy aspects are similar and both missions were designed specifically for high precision astronmetry. After three and a half years of observations HIPPARCOS produced three catalogues. In 1997 the HIPARCOS catalogue of ∼120000 stars and the first Tycho catalogue containing about one million stars. In 2000 the consolidated catalogue Tycho-2 was released. It contains 99% of all stars down to magnitude 11, approximately ∼ 2.5 million objects.

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]; Planétologie et astrophysique de la terre [astro-ph.EP]

Daniel Hestroffer, Pedro David. Global Dynamics and Ephemerides. GAIA-FUN-SSO 2012: Second "Gaia Follow-up Network for Solar System Objects", Workshop held at IMCCE / Paris Observatory, 2012, September 19 - 21, Sep 2012, Paris, France. pp. 45-50. ⟨hal-00836272⟩