Data Release scenario

On this webpage, the target release scenario is presented, based on the current status of processing.

Photometric and new asteroid science alerts are already being issued.

In general, individual epoch observations and transits will be released only with the final catalogue. However, when variable star solutions, etc. are released, relevant subsets of epoch data may also be released. Additionally, where the release of epoch data is of immediate scientific interest, such release will be made on an individual source-by-source basis through the science alerts.

After production of the catalogue for release, a validation exercise will be executed. The final, detailed release contents will be decided on only after completion of the validation work.

Warning: dense fields will not be fully populated in early releases, especially for stars fainter than ~15th magnitude.


First release: 14 September 2016  


Gaia DR1 contains:

Second release: April 2018  


Subject to successful validation, the Gaia DR2 will be consisting of:

  • Five-parameter astrometric solutions for all sources with acceptable formal standard errors (>109 anticipated), and positions (α, δ) for sources for which parallaxes and proper motions cannot be derived.
  • G and integrated GBP and GRP photometric fluxes and magnitudes for all sources.
  • Median radial velocities for sources brighter than GRVS=12 mag.
  • For stars brighter than G=17 mag estimates of the effective temperature and, where possible, line-of-sight extinction will be provided, based on the above photometric data.
  • Photometric data for a sample of variable stars.
  • Epoch astrometry for a pre-selected list of  >10,000 asteroids


The DPAC project office and ESA are working on the longer term data release schedule. The release planned at three years after the end of the nominal mission lifetime (called 'final release' below) will be maintained, while the number of releases between Gaia DR2 and the final release remains to be decided​. Note: the total astrophysical content promised to be released will not be changed.


Third release: (TBC)


Potentially, the catalogue will be consisting of:

  • Orbital solutions, together with the system radial velocity and five-parameter astrometric solutions, for binaries having periods between 2 months and 75% of the observing time will be released.
  • Object classification and astrophysical parameters, together with BP/RP spectra and/or RVS spectra they are based on, will be released for spectroscopically and (spectro-)photometrically well-behaved objects.
  • Mean radial velocities will be released for those stars not showing variability and with available atmospheric-parameter estimates.
Fourth release: (TBC)  


Potentially, the catalogue will be consisting of:

  • Variable-star classifications will be released together with the epoch photometry used for the stars.
  • Solar-system results will be released with preliminary orbital solutions and individual epoch observations.
  • Non-single star catalogues will be released.
Final release for the nominal mission: 2022  


The catalogue will be consisting of:

  • Full astrometric, photometric, and radial-velocity catalogues.
  • All available variable-star and non-single-star solutions.
  • Source classifications (probabilities) plus multiple astrophysical parameters (derived from BP/RP, RVS, and astrometry) for stars, unresolved binaries, galaxies, and quasars. Some parameters may not be available for faint(er) stars.
  • An exo-planet list.
  • All epoch and transit data for all sources.
  • All ground-based observations made for data-processing purposes.