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SAC Seminar - Erik Høg: Hipparcos - Roemer – Gaia

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Monday 25 February 2013,  at 15:00 - 16:00

Speaker: Erik Høg, Niels Bohr Institute, Copenhagen University

Title: Hipparcos - Roemer – Gaia

ABSTRACT: During the Hipparcos space astrometry mission in September 1992, I presented a concept for using direct imaging on CCDs in scanning mode in a new and very powerful astrometric satellite, Roemer. The Roemer concept with larger aperture telescope for higher accuracy was developed by ESA and a mission was approved in 2000, expected to be a million times better than Hipparcos. The name Gaia mission reminds of an interferometric option also studied in the period 1993-97, and this period is a main subject of my presentation which also gives an overview of the two missions Hipparcos and Gaia.