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astro-ph.IM2011
Astrometry history: Roemer and Gaia
Erik Høg
During the Hipparcos 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. Th…
astro-ph.IM2011
Astrometry during the past 100 years
Erik Høg
The reports from 2008: "Astrometry and optics during the past 2000 years", are available at arXiv and at my website: www.astro.ku.dk/~erik/History.pdf . Here are now further contri…
astro-ph.IM2011
Astrometry during the past 2000 years
Erik Høg
The satellite missions Hipparcos and Gaia by the European Space Agency will together bring a decrease of astrometric errors by a factor 10000, four orders of magnitude, more than w…