URAT-1 Best Neighbour (gaiaedr3.urat1_best_neighbour)
The table has 227682912 rows, 7 columns.
URAT-1 BestNeighbour table lists each matched Gaia object with its bestneighbour in the external catalogue. The cross-match algorithm is notsymmetric and searches Gaia sources counterparts in URAT-1.The best neighbour is chosen among good neighbours as the one withthe highest value of the figure of merit, which evaluates the ratio be-tween two opposite models/hypotheses: the counterpart candidate is amatch or it is found by chance. Good neighbours are nearby objects inthe external catalogue whose position is compatible within position er-rors with the Gaia target.
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 (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://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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|Dimensionless||Unique Gaia source identifier|
|original_ext_source_id||char||meta.id.cross||Dimensionless||Original External Catalogue source identifier|
|angular_distance||float||pos.angDistance||Angle[arcsec]||Angular Distance between the two sources|
|xm_flag||short||meta.code.status||Dimensionless||Cross-match algorithm flag|
|urat1_oid||int||meta.id.cross||Dimensionless||External Catalogue source identifier|
|number_of_neighbours||short||meta.number||Dimensionless||Number of neighbours in External Catalogue|
|number_of_mates||short||meta.number||Dimensionless||Number of mates in Gaia Catalogue|