Reference Systems

The Galactic Aberration and Its Impact on Astronomical Reference Frames
Review of Galactic aberration (~5 μas/yr) and its consequences for ICRF/Gaia frames and EOP (~1 μas/yr precession corrections).
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The Galactic Aberration and Its Impact on Astronomical Reference Frames
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