gaiasupdate - a Python package for Gaia DR4 astrometric timeseries

A small Python software package named gaiasupdate is available and demonstrates how to load and process the Gaia DR4 astrometric timeseries for a given source, and to obtain its astrometric parameters assuming the default single-star model. This software is open source.

The Gaia DR4 astrometric timeseries will be available in the epoch_astrometry product retrievable via the DataLink protocol, see https://www.cosmos.esa.int/web/gaia/dr4. The draft datamodel for epoch_astrometry is available here. For most sources, the epoch_astrometry makes it possible to reproduce the astrometric parameters of the Gaia DR4 core astrometric solution with negligible deviations.

The software is available at https://github.com/esa/gaia-supdate and can be installed via e.g. pip.

The code documentation and installation instructions are available here: https://esa.github.io/gaia-supdate/

This software can be used together with the pre-released Gaia DR4 astrometric timeseries of 12 stars described here: https://www.cosmos.esa.int/web/gaia/dr4-prerelease

Example notebooks that demonstrate how to use this package for the analysis of single and binary stars are available at https://github.com/esa/gaia-jupyter-notebooks/tree/main/data-release-4-tutorials and https://github.com/esa/gaia-bhthree/tree/gaia-dr4-prerelease, respectively.