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We present the results of our study of astrometric stability of 200-in Hale(Mt. Palomar) and 10-m Keck II (Mauna Kea) telescopes, both with AdaptiveOptics (AO) facilities. A group of nearby visual binaries and multiples wasobserved in near infrared, relative separations and position angles measured.We have also checked the influence of some systematic effects (e.g.atmospherical refraction, varying plate scale factor) on result and precisionof astrometric measurements. We conclude that in visual binaries astrometricalobservations it is possible to achieve much better precision than 1miliarcsecond, which in many cases allows detection of the astrometrical signalproduced by planetary-mass object.

Precise Astrometry of Visual Binaries with Adaptive Optics. A way for finding exoplanets?