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gaia early data release 3 documentation

12.6 Differences between the Gaia EDR3 and DR2 data models

12.6.1 Table changes in Gaia EDR3

The following differences with respect to Gaia DR2 should be noted:

Main catalogue tables

The following Gaia DR2 table is not present in Gaia EDR3:

  • ruwe.

The single parameter contained therein, namely the renormalised unit–weight error, is included in gaia_source No further tables have been added in this part of the data model.

Solar system object tables

The following Gaia DR2 tables are not present in Gaia EDR3:

  • sso_observation;

  • sso_source.

Solar system tables will reappear in the full Gaia DR3. No further tables have been added in this part of the data model.

Variability tables

The following Gaia DR2 tables are not present in Gaia EDR3:

  • vari_cepheid;

  • vari_classifier_class_definition;

  • vari_classifier_definition;

  • vari_classifier_result;

  • vari_long_period_variable;

  • vari_rotation_modulation;

  • vari_rrlyrae;

  • vari_short_timescale;

  • vari_time_series_statistics.

An expanded set of variability tables will reappear in the full Gaia DR3. No further tables have been added in this part of the data model.

External catalogues

External catalogue tables added at Gaia EDR3 are:

  • tycho2_tdsc_merge: a merge of the Tycho2 (Høg et al. 2000) and Tycho Double Star (TDSC; Fabricius et al. 2002) catalogues

At Gaia DR2 the data model descriptions for external catalogues served through the Gaia archive included those released and documented with Gaia DR1. For Gaia EDR3 we have not duplicated these descriptions, but users should note that the external catalogue tables themselves remain available in the archive for use in conjunction with the crossmatch tables (see below). Moreover the associated online data model documentation remains available (Hambly et al. 2018).

Crossmatches

The following Gaia DR2 tables are not present in Gaia EDR3:

  • sdssdr9_best_neighbour (superseded by SDSS DR13 – see below);

  • sdssdr9_neighbourhood (superseded by SDSS DR13 – see below);

  • tmass_best_neighbour (superseded by 2MASS PSC/XSC combined – see below);

  • tmass_neighbourhood (superseded by 2MASS PSC/XSC combined – see below);

  • tycho2_best_neighbour (superseded by Tycho2/TDSC combined – see below);

  • tycho2_neighbourhood (superseded by Tycho2/TDSC combined – see below).

The following tables have been added at Gaia EDR3:

  • panstarrs1_join;

  • sdssdr13_best_neighbour;

  • sdssdr13_neighbourhood;

  • sdssdr13_join;

  • skymapperdr2_best_neighbour;

  • skymapperdr2_neighbourhood;

  • skymapperdr2_join;

  • tycho2_tdsc_merge_best_neighbour;

  • tycho2_tdsc_merge_neighbourhood;

The following tables are to be added soon after the main release:

  • tmass_psc_xsc_best_neighbour;

  • tmass_psc_xsc_neighbourhood;

  • tmass_psc_xsc_join;

  • allwise_best_neighbour;

  • allwise_neighbourhood;

  • apassdr9_best_neighbour;

  • apassdr9_neighbourhood;

  • gsc23_best_neighbour;

  • gsc23_neighbourhood;

  • gsc23_join;

  • ravedr5_best_neighbour;

  • ravedr5_neighbourhood;

  • ravedr5_join.

Further details concerning the contents and use of the join tables in conjunction with the usual neighbour and neighbourhood tables can be found in Chapter 8.

Auxiliary tables

The following Gaia DR2 tables are not present in Gaia EDR3:

  • aux_allwise_agn_gdr2_cross_id (superseded – see below);

  • aux_iers_gdr2_cross_id (superseded – see below);

  • aux_sso_orbit_residuals;

  • aux_sso_orbits;

  • dr1_neighbourhood (superseded – see below).

The following Gaia EDR3 tables have been added:

  • agn_cross_id;

  • commanded_scan_law;

  • dr2_neighbourhood;

  • frame_rotator_source;

  • gaia_source_simulation (see Section 2.3);

  • gaia_universe_model (see Section 2.2).

Datalink tables

The following Gaia DR2 tables are not present in Gaia EDR3:

  • light_curve;

  • epoch_photometry.

Datalink resources (enormously expanded over those available at Gaia DR2) will reappear in the full Gaia DR3.