Weak Gravitational Lensing and Instability of the Celestial Reference Frame
The fluctuation of the angular positions of reference extra galactic radio sources caused by the gravitational lensing on visible stars and dark bodies of our Galaxy is considered. It is shown that these angular fluctuations range from a few up to hundreds of microarcseconds. The random proper motions of the stars and the dark bodies lead to a small rotation of the celestial reference frame. It limits the accuracy of realization of the inertial reference frame. It is shown that the gravitational lensing does not allow to align the axes of the different reference frames better than a few microarcseconds.
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