Gaia Simulations

Two kind of Gaia catalogue simulations are available to the community.

GUMS - Gaia Universe Model Snapshot

Described in Robin et al. 2012.
It contains a simulation of the objects that can be observed by Gaia down to a given limiting magnitude.

GOG - Gaia Object Generator

Described in Luri et al. 2014.
GOG is the transformation of GUMS into Gaia final (or intermediate) catalogue data.

Data availability

GUMS 10 is available in VizieR. It corresponds to the version described in Robin et al. 2012.
GUMS 18 is available in HDF5 format at OBSPM. It is the latest version available.
GOG 18 is available in HDF5 format at OBSPM. It is based on Gaia nominal performances.

Zsync file can help you to download incrementally big HDF5 files (support only http protocol, not https). See here or here for more informations.


For more information, contact Carine Babusiaux (carine.babusiaux at or Eduard Masana (emasana at