Gaia Data Release 2
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Table 4

BestNeighbour output table content.

Field name Short description
SourceId Gaia source identifier
OriginalExtSourceId Original External Catalogue source identifier
AngularDistance Haversine angular distance (arcsec)
NumberOfMatesa Number of mates in Gaia catalogue
NumberOfNeighbours Number of good neighbours in the second catalogue
BestNeighbourMultiplicitya Number of neighbours with same probability as best neighbourb
GaiaAstrometricParams Number of Gaia astrometric
parameters used

Notes. (a) Column available only for dense surveys. See Sects. 2 and 3. (b) Two neighbours with the same probability are normally sources with different identifiers, but exactly the same coordinates and coordinate errors. The cross-match algorithm is thus unable to distinguish them, and either can be selected as bestNeighbour.

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