Hipparcos2 Best Neighbour (gaiaedr3.hipparcos2_best_neighbour)

The table has 99525 rows, 5 columns.


Hipparcos2 BestNeighbour table lists each matched external catalogueobject with its best neighbour in Gaia. The cross-match algorithm is notsymmetric and searches Hipparcos2 sources counterparts in Gaia.The best neighbour is chosen among good neighbours as the one with thehighest value of the figure of merit, which evaluates the ratio betweentwo opposite models/hypotheses: the counterpart candidate is a match orit is found by chance. Good neighbours are nearby objects in Gaia whoseposition is compatible within position errors with the external catalogue 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 int meta.id.cross 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 Gaia Catalogue
xm_flag short meta.code.status Dimensionless Cross-match algorithm flag