Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry

Niu Liu, Zi Zhu, John Antoniadis, Jia-Cheng Liu, Hao Zhang, Nan Jiang

February 2023

Orientation offsets of DE frames referred to the VLBI celestial frame. Image credit: A&A / NJU Astrometry Group

Abstract

Using pulsar positions measured independently by timing, VLBI, and Gaia, this paper assesses the orientation consistency between dynamical ephemeris-based frames (e.g., DE series) and the kinematic frames realized by Gaia and VLBI at sub-milliarcsecond precision.

Type

Journal article

Publication

Astronomy & Astrophysics 670, A173 (2023)

Pulsars provide a unique bridge between dynamical (planetary ephemeris–based) and kinematic (Gaia/VLBI) celestial reference frames. By comparing pulsar positions from timing, VLBI, and Gaia, this study estimates orientation offsets between these frames and discusses systematics driven by sample composition (MSP vs. non‑MSP) and ecliptic‑latitude selection.