DR3

DR3 is an acronym used across disciplines to designate a third data release or version. In astronomy, DR3 most commonly refers to Gaia Data Release 3, from the European Space Agency's Gaia mission. Gaia DR3 provides astrometric measurements—positions on the sky, parallaxes, and proper motions—for hundreds of millions to over a billion sources, along with photometric time series and, for a substantial subset, spectroscopic information. The data enable studies of stellar kinematics, Galactic structure, and astrophysical parameter estimation. Access is provided through the Gaia Archive, with documentation on data models, quality flags, calibration notes, and caveats related to completeness and systematics.

In other domains, DR3 is used to denote the third data release or version of a dataset or software project. Because the label is generic, the exact content and scope of DR3 varies by project; readers should consult the specific project's release notes or portal to determine what data are included, how to access them, and any limitations or usage guidelines. The term DR3, therefore, is context-dependent and requires project-specific documentation to identify the precise data or features it encompasses.