Gaia

An all-sky assessment of nine plate models shows that plate-solution uncertainty can contribute at the metre-per-second level to stellar-aberration-based navigation.

An RFC–Gaia study showing that redshift trends in optical astrometry and radio-optical offsets are largely linked to magnitude and source-population effects, while VLBI properties show no significant redshift dependence.

We investigate the astrometric properties of CatWISE2020 relative to Gaia DR3 and show that, after correcting systematic errors, it can serve as an infrared realization of the International Celestial Reference System.

A statistical study of more than two million LQAC-6 quasars examines their sky distribution, astrometric uncertainties, redshift consistency, and optical luminosities, with implications for celestial reference frames.

Asteroid-based tie between Gaia-CRF3 and DE440 shows ~10 mas orientation offset; adding Gaia into orbit solutions reduces it to ~0.2 mas.

An assessment of AllWISE astrometry and its use as an infrared celestial reference frame through comparison with Gaia DR3.

We discovered a new term of secular aberration drift due to the changing line of sight, affecting stellar proper motions measured by Gaia.

Using pulsar positions measured independently by timing, VLBI, and Gaia, this paper assesses the orientation consistency between …

Comparison of ICRF3 and Gaia EDR3 positions and the influence of radio source structure.

Multiwavelength VLBI–Gaia astrometry reveals alignments between radio–optical offsets and parsec-scale AGN jets, consistent with a core–jet scenario.