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A New Reduction of the Hipparcos Catalogues
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=41375ESA announcement of a recalculation of the data which improves accuracy by compensating for systematic errors of thermal and micrometeoritic origin.
Submitted in section: Astronomy: Data Archives: Stellar and Astrometric: A New Reduction of the Hipparcos Catalogues