APASS DR9 BestNeighbour table lists each matched Gaia object with its best neighbour in the external catalogue.
If you have used Gaia data in your research, please use the following acknowledgement:
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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|apassdr9_oid||long||meta.id.cross||External Catalogue source identifier|
|number_of_neighbours||int||meta.number||Number of neighbours in External Catalogue|
|number_of_mates||short||meta.number||Number of mates in Gaia Catalogue|
|best_neighbour_multiplicity||short||meta.number||Number of neighbours with same probability as best neighbour|