ICRF3 axis stability from VLBI position time series (Liu et al. 2022, A&A 659, A75)Abstract
We evaluate the stability of the ICRF3 axes using source position time series derived from S/X-band VLBI observations between August 1979 and December 2020. We assess both the global spin and the scatter of yearly frame orientations. Each spin component is no larger than 0.8 μas/yr, with an uncertainty of 0.3 μas/yr. Yearly axis orientations have standard deviations of 10–20 μas, with no degradation in stability after the adoption of ICRF3.
Niu Liu
Assistant Professor
My research focuses on astronomical reference systems, VLBI astrometry, space astrometry, and pulsar astrometry.
Jia-Cheng Liu
Professor
My research interests include theoretical mechanics, space astrometry, and astronomical reference systems.
Zi Zhu
Professor
My research focuses on astrometric methods, astronomical reference systems, and Galactic astronomy.