ICRF

Evaluation of the ICRF stability from a position time series analysis
VLBI-based evaluation of ICRF3 stability shows that the axes are stable at the 10–20 μas level over 1979–2020.
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Evaluation of the ICRF stability from a position time series analysis
Comparison of multifrequency position measurements of compact extragalactic radio sources in the framework of the ICRF3
VLBI analysis of multifrequency source positions shows measurable frequency-dependent core shifts in compact extragalactic radio sources.
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Comparison of multifrequency position measurements of compact extragalactic radio sources in the framework of the ICRF3
Systematics and accuracy of VLBI astrometry: A comparison with Gaia Data Release 2
ICRF3 vs Gaia DR2: S/X agrees at ~30 μas globally; K and X/Ka show zonal systematics, notably a >200 μas Z-glide in X/Ka.
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Systematics and accuracy of VLBI astrometry: A comparison with Gaia Data Release 2