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From the Roemer mission to Gaia
2007
Proceedings of the International Astronomical Union
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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.
doi:10.1017/s1743921308019418
fatcat:2jzkksgczbe4jkl645ybu7xy3a