The influence of Galactic aberration on precession parameters determined from VLBI observations

Abstract

The influence of proper motions of sources due to Galactic aberration on precession models based on VLBI data is determined. Comparisons of the linear trends in the coordinates of the celestial pole obtained with and without taking into account Galactic aberration indicate that this effect can reach 20 $\mu$as per century, which is important for modern precession models. It is also shown that correcting for Galactic aberration influences the derived parameters of low-frequency nutation terms. It is therefore necessary to correct for Galactic aberration in the reduction of modern astrometric observations.

References in corpus (6)

• VLBI measurement of the secular aberration drift
• Galactic Parameters from Masers with Trigonometric Parallaxes
• On comparison of the Earth orientation parameters obtained from different VLBI networks and observing programs
• Effect of asymmetry of the radio source distribution on the apparent proper motion kinematic analysis
• Secular Aberration Drift and IAU Definition of ICRS
• Reconsidering the galactic coordinate system

Cited by in corpus (7)

• Analysis of Determinations of the Distance between the Sun and the Galactic Center
• On the implications of the Galactic aberration in proper motions for celestial reference frame
• Aberration in proper motions for stars in our Galaxy
• Statistical analysis of the determinations of the Sun's Galactocentric distance
• Connecting VLBI and Gaia celestial reference frames
• Overall properties of the Gaia DR1 reference frame
• On the most reliable value of the Galactic aberration constant