VLBI

Astronomical determination of the Earth's dynamical flattening using VLBI observations and IAU 2006/2000 Precession-Nutation Model
VLBI celestial pole observations provide a consistent estimate of the Earth’s dynamical flattening for precession and nutation and recover long-term J₂ variations broadly consistent with satellite laser ranging.
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Astronomical determination of the Earth's dynamical flattening using VLBI observations and IAU 2006/2000 Precession-Nutation Model
Detections of Nearly Bias-free Core Shifts with 5–30 μas Precisions at 8–43 GHz in BL Lacertae
Inverse phase-referencing VLBI astrometry measures nearly bias-free core shifts in BL Lacertae with 5–30 μas precision, providing constraints on opacity and physical conditions in the inner jet.
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Detections of Nearly Bias-free Core Shifts with 5–30 μas Precisions at 8–43 GHz in BL Lacertae
Astrometric properties of reference frame sources as a function of redshift
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.
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Astrometric properties of reference frame sources as a function of redshift
The IAU 2006 precession quantities with an improved Earth's $J_{2}$ long-term variation
Nearly 50 years of satellite laser ranging observations support a parabolic model of Earth’s long-term $J_{2}$ variation. Incorporating this variation into the precession equations yields an updated solution with improved agreement with VLBI celestial pole offsets.
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The IAU 2006 precession quantities with an improved Earth's $J_{2}$ long-term variation
Oleg Titov and Feng-Chun Shu Visit Our Group
Oleg Titov and Feng-Chun Shu visit our group for academic discussions, with presentations on future improvements to the ICRF and the OCCAM VLBI analysis software.
Sep 6, 2024 — Sep 7, 2024 Nanjing University
Oleg Titov and Feng-Chun Shu Visit Our Group
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