• Media type: E-Article
  • Title: From the Roemer mission to Gaia
  • Contributor: Høg, E.
  • Published: Cambridge University Press (CUP), 2007
  • Published in: Proceedings of the International Astronomical Union, 3 (2007) S248, Seite 300-302
  • Language: English
  • DOI: 10.1017/s1743921308019418
  • ISSN: 1743-9213; 1743-9221
  • Origination:
  • Footnote:
  • Description: AbstractAt the IAU symposium in Shanghai September 1992 the present author made the first proposal for a specific mission concept post-Hipparcos, the first scanning astrometry mission with CCDs in time-delayed integration mode (TDI). Direct imaging on CCDs in long-focus telescopes was described as later adopted for the Gaia mission. The mission called Roemer was designed to provide accurate astrometry and multi-colour photometry of 400 million stars brighter than 18 mag in a five-year mission. The early years of this mission concept are reviewed.