Gaia

Comparison of the Gaia-CRF3 and planetary ephemerides via asteroid observations
Asteroid-based tie between Gaia-CRF3 and DE440 shows ~10 mas orientation offset; adding Gaia into orbit solutions reduces it to ~0.2 mas.
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Comparison of the Gaia-CRF3 and planetary ephemerides via asteroid observations
The AllWISE Catalog as an Infrared Celestial Reference Frame in the Gaia Era
AllWISE shows sub-10 mas systematics and sub-0.1 mas yr⁻¹ spin relative to Gaia DR3, making it a robust infrared celestial reference frame.
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The AllWISE Catalog as an Infrared Celestial Reference Frame in the Gaia Era
Secular aberration drift in stellar proper motions — An additional term due to the change in line-of-sight direction
We discovered a new term of secular aberration drift due to the changing line of sight, affecting stellar proper motions measured by Gaia.
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Secular aberration drift in stellar proper motions — An additional term due to the change in line-of-sight direction
Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Using pulsar positions measured independently by timing, VLBI, and Gaia, this paper assesses the orientation consistency between …
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Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Parsec-scale alignments of radio–optical offsets with jets in AGNs from multifrequency geodetic VLBI, Gaia EDR3, and the MOJAVE program
Alignment of multiwavelength VLBI–Gaia positions with parsec-scale jets; optical centroids are downstream and polarized, consistent with a core–jet scenario.
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Parsec-scale alignments of radio–optical offsets with jets in AGNs from multifrequency geodetic VLBI, Gaia EDR3, and the MOJAVE program
Revisiting astrometric parameters of quasars in Gaia-CRF2
Quality analysis of Gaia-CRF2 quasar astrometry using visibility periods and correlation coefficients; quasars with 13–16 visibility periods yield the most reliable parameters.
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Revisiting astrometric parameters of quasars in Gaia-CRF2
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