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We consider an influence of a non-stationary gravitational field of theGalaxy on the visible positions of extragalactic sources. A contribution of thebaryonic component of the galactic matter as well as of the hidden matter(including a population of brown dwarfs) were took into account. The observedvariations of the deflection angle of light rays in a gravitational field ofrandomly moving point-like masses can be considered as a stochastic process.Using such an approach we constructed an autocorrelation function of studiedstochastic process and found that its relative changes are about 15% for oneyear and about 35% for ten years.

An influence of the matter distribution on the positional accuracy of reference sources