Open clusters with Hipparcos I. Mean astrometric parameters


Newmemberships, mean parallaxes and proper motions of all 9 open clusters closer than300pc (except theHyades) and 9 rich clusters between 300 and 500 pc have been computed using Hipparcos data. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to 0.5 mas/yr for proper motions, are of great interest for calibrating photometric parallaxes as well… (More)


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