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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Name Type UCD Unit Description
source_id long meta.id
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