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

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

2011-09-02

arxiv.org/abs/1109.0514v1

Astronomy Reports, 2011, Vol. 55, No. 9, 810-815

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Scientific paper

10.1134/S1063772911090058

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.

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