Evaluate the ICRF3 axes stability via extragalactic sourceposition time series

Niu Liu, Sebastien Lambert, Felicitas Arias, Jia-Cheng Liu, Zi Zhu

Submitted on 30 June 2022


We present an updated study on assessing the axes stability of the third generation of the International Celestial Reference Frame (ICRF3) in terms of linear drift and scatter based on the extragalactic source position time series from analyses of archival very long baseline interferometry observations. Our results show that the axes of the ICRF3 are stable at a level of 10 to 20 microseconds of arc, and it does not degrade after the adoption of the ICRF3 when observations from new networks are included. We also show that the commonly used method of deriving the position time series (four-step solution) is robust.


Comment: 5 pages, submitted to the IVS GM2022 proceeding

Subject: Astrophysics - Instrumentation and Methods for Astrophysics