The prototype for our Astronomy Distributed Annotation System (As-troDAS) complements the existing OpenSkyQuery tools for federated database queries, and provides web service methods to allow clients to  ...  We focus on a case study provided by the astronomical community's Virtual Observatory effort to investigate the use of annotation to record and share the celestial object mappings asserted by different  ...  Acknowledgements We would like to thank: John Taylor, Emma Taylor, Martin Hill, and other members of the Wide Field Astronomy Unit, University of Edinburgh; Anastasios Kementsietsidis, Floris Geerts and  ...