Secular Aberration Drift and IAU Definition of ICRS
Oleg Titov
TL;DR
This paper discusses how the gravitational pull of the Galactic center causes a drift in the apparent positions of distant radio sources, impacting high-precision astrometry and requiring an update to the ICRS definition.
Contribution
It highlights the need to incorporate secular aberration drift into the ICRS framework and astrometric calculations due to Galactic gravitational effects.
Findings
Secular aberration drift affects the apparent positions of distant radio sources.
The effect is significant for high-precision astrometry.
An update to the ICRS definition is recommended.
Abstract
The gravitational attraction of the Galactic centre leads to the centrifugal acceleration of the Solar system barycentre. It results in secular aberration drift which displaces the position of the distant radio sources. The effect should be accounted for in high-precision astrometric reductions as well as by the corresponding update of the ICRS definition.
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