Hipparcos-2 Neighbourhood table includes all good neighbours for each matched external catalogue object. A good neighbour for a given external catalogue object is a nearby object in Gaia whose position is compatible (within position errors) with the target.
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This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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|original_ext_source_id||long||meta.id.cross||Original External Catalogue source identifier|
|angular_distance||double||pos.angDistance||Angle[arcsec]||Angular Distance between the two sources|
|score||double||meta.code||Score of neighbours|
|gaia_astrometric_params||short||meta.code.status||Number of Gaia astrometric params used|