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Published online by Cambridge University Press: 12 April 2016
The orbit of the visual double star ADS 48 AB is determined on the basis of Pulkovo and Washington sets of observations. The similar deviations in observations of the both sets are discovered. It may be explained by the existence of the invisible satellite with a mass about 0.0lM⊙.
The author of this paper was unable to attend the Colloquium — eds.