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The Astrographic Catalogue

A Gold Mine for Proper Motions

Published online by Cambridge University Press:  25 May 2016

D.H.P. Jones*
Affiliation:
Royal Greenwich Observatory, Cambridge, UK

Extract

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The most reliable method of cross-wavelength identification is the coincidence of accurately determined positions, both referred to the same reference frame. But objects move with time and the more accurate their positions, the more important their proper motions are.