Reference Systems

Systematics of planetary ephemeris reference frames inferred from pulsar timing astrometry
We determined that current planetary ephemeris reference frames are aligned within 0.4 mas and non-rotating to better than 5 μas/yr.
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Systematics of planetary ephemeris reference frames inferred from pulsar timing astrometry
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
Evaluate the ICRF3 Axes' Stability via Extragalactic Source Position Time Series
VLBI source position time series indicate that the ICRF3 axes are stable at the 10–20 microarcsecond level and confirm the robustness of the commonly used four-step solution.
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Evaluate the ICRF3 Axes' Stability via Extragalactic Source Position Time Series
Effect of Galactic aberration on Earth orientation parameters: From the ICRF2 to the ICRF3
We estimated the effect of Galactic aberration on Earth orientation parameters based on geodetic/astrometric very long baseline …
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Effect of Galactic aberration on Earth orientation parameters: From the ICRF2 to the ICRF3
Evaluation of the ICRF stability from a position time series analysis
Source position time series constrain the global spin and yearly orientation stability of the ICRF3 axes.
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Evaluation of the ICRF stability from a position time series analysis
Comparison of multifrequency positions of extragalactic sources from ICRF3 and Gaia EDR3
Comparison of ICRF3 and Gaia EDR3 positions and the influence of radio source structure.
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Comparison of multifrequency positions of extragalactic sources from ICRF3 and Gaia EDR3
Parsec-scale alignments of radio–optical offsets with jets in AGNs from multifrequency geodetic VLBI, Gaia EDR3, and the MOJAVE program
Multiwavelength VLBI–Gaia astrometry reveals alignments between radio–optical offsets and parsec-scale AGN jets, 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
Is there an interest in bringing Gaia-CRF into VLBI data reduction?
An exploratory study of using Gaia-CRF2 in VLBI data reduction examines how celestial-frame constraints affect source positions, Earth orientation parameters, and the terrestrial reference frame.
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Is there an interest in bringing Gaia-CRF into VLBI data reduction?
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