Gaia DR2 celestial reference frame sources (gaiadr2.aux_iers_gdr2_cross_id)

The table has 2820 rows, 2 columns.


Tables aux_iers_gdr2_cross_id and aux_allwise_agn_gdr2_cross_id list sources whose positions in Gaia DR2 define the celestial reference frame of Gaia DR2 (GaiaCRF2).

aux_iers_gdr2_cross_id lists 2820 sources in Gaia DR2 identified as the optical counterparts of VLBI sources with accurate VLBI positions in the ICRF. The first column is the IERS name of the VLBI source, the second column is the source identifier in Gaia DR2 of the optical counterpart.

aux_allwise_agn_gdr2_cross_id lists 555934 sources in Gaia DR2 cross-matched to sources in the AllWISE AGN catalogue . The first column is the AllWISE identifier, the second column is the source identifier in Gaia DR2.

1885 of the Gaia DR2 source identifiers in table aux_iers_gdr2_cross_id appear also in table aux_allwise_agn_gdr2_cross_id.


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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
iers_name char

IERS name

source_id long

Gaia source identifier