APASS DR9 Join (gaiadr3.apassdr9_join)
The table has 61176394 rows, 2 columns.
Convenience table to be used to join the APASS DR9 catalogue with the cross-match results. The table links the external catalogue original source_id (original_ex_source_id) to the corresponding additional numerical identifier (clean_apassdr9_oid). Both original_ext_source_id and clean_apassdr9_oid are present in the cross-match output tables (apassdr9_best_neighbour and apassdr9_neighbourhood). However, in case there are suspected duplicates in the external catalogue, different original_ext_source_id will correspond to the same clean_apassdr9_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 in all matching suspected duplicates should instead use the clean_apassdr9_oid in the join with the cross-match result tables.See Chapter [chap:crossmatch] for more details on the duplicates in the external catalogues and their treatment in the cross-match computations.
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Original External Catalogue source identifier
External Catalogue source identifier