Gaia DR2 miscellaneous catalogs (other than main source catalog) are provided as a gzipped csv file, and can be downloaded as a tar file from the link below:
gaiadr2-misc.tar (2.9GB)
The contents of the tar file are as follow:
. ├── Auxiliary │ ├── AuxAllwiseAgnGdr2CrossId.csv.gz # cross-matched to sources in the AllWISE AGN catalogue │ ├── AuxIersGdr2CrossId.csv.gz # identified as the optical counterparts of VLBI sources │ ├── AuxSsoOrbits.csv.gz # Auxiliary information on asteroid orbits and basic photometric parameters │ └── AuxSsoResiduals.csv.gz # Residuals with respect to an orbital fit considering only the Gaia observations ├── Datalink │ └── EpochPhotometry # ├── SSO │ ├── SsoObservation # Solar System object observations. │ └── SsoSource # Solar System objects observed by Gaia └── Variability ├── VariCepheid # the Cepheid stars ├── VariClassifierClassDefinition # detailed descriptions of published classes for each classifier ├── VariClassifierDefinition # detailed descriptions of all classifiers used in table vari_classifier_result ├── VariClassifierResult # variability classification results of all classifiers ├── VariLongPeriodVariable # the Long Period Variable stars ├── VariRotationModulation # the solar-like stars with rotational modulation ├── VariRrlyrae # the RR Lyrae stars ├── VariShortTimescale # the short-timescale sources └── VariTimeSeriesStatistics # Statistical parameters of time series
The details of the tables and theirs columns can be found at Chapter 14 : Datamodel description in the Gaia DR2 document.