SkyMapper DR2 Best Neighbour (gaiaedr3.skymapperdr2_best_neighbour)

The table has 446161568 rows, 6 columns.


SkyMapper DR2 BestNeighbour table lists each matched Gaia objectwith its best neighbour in the external catalogue. The cross-match algo-rithm is not symmetric and searches Gaia sources counterparts in SkyMap-per DR2.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 (, processed by the Gaia Data Processing and Analysis Consortium (DPAC, 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
Dimensionless Unique Gaia source identifier
original_ext_source_id long Dimensionless Original External Catalogue source identifier
angular_distance float pos.angDistance Angle[arcsec] Angular Distance between the two sources
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
xm_flag short meta.code.status Dimensionless Cross-match algorithm flag