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gaia early data release 3 documentation

12.3 Crossmatches

12.3.4 panstarrs1_join

Convenience table to be used to join Pan-STARRS1 DR1.1 catalogue with the cross-match results. The table links the external catalogue original source_id (original_ext_source_id) to the corresponding the additional numerical identifier (clean_panstarrs1_oid).
Both original_ext_source_id and clean_panstarrs1_oid are present in the cross-match output tables (panstarrs1BestNeighbour and panstarrs1Neighbourhood). However, in case there are suspected duplicates in the external catalogue, different original_ext_source_id will correspond to the same clean_panstarrs1_oid.
In the cross-match output table only the original_ext_source_id of the source with the best astrometry among the suspected duplicates will be listed.
In practice, users may use the original_ext_source_id in the original catalogue to find the matching source with the best astrometry. Users interested to find all matching suspected duplicates should instead use the clean_panstarrs1_oid in the join with the cross-match result tables.
See Documentation, 8, for more details on the duplicates in the external catalogues and their treatment in the cross-match computations.

Columns description:

original_ext_source_id : Original External Catalogue source identifier (long)

The unique source identifier in the original External catalogue.

clean_panstarrs1_oid : External Catalogue source identifier (long)

The additional numeric source identifier of the External catalogue, increasing with Declination.