URAT-1 Best Neighbour (gaiaedr3.urat1_best_neighbour)

The table has 227682912 rows, 7 columns.

Description

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.

Attribution

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.

More information can be found on the credit and citation instructions page.

Columns

Name Type UCD Unit Description
source_id long meta.id
meta.main
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