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Mass ratios of widely separated, long-period, resolved binary stars can bedirectly estimated from the available data in major space astrometry catalogs,such as the ESA's Hipparcos and Gaia mission results. The method is based onthe universal principle of inertial motion of the system's center of mass inthe absence of external forces, and is independent of any assumptions about thephysical parameters or stellar models. The application is limited by theprecision of input astrometric data, the orbital period and distance to thesystem, and possible presence of other attractors in the vicinity, such as intriple systems. A generalization of this technique to triples is proposed, aswell as approaches to estimation of uncertainties. The known long-period binaryHIP 473 AB is discussed as an application example, for which a$m_2/m_1=0.996^{+0.026}_{-0.026}$ is obtained.

Mass ratios of long-period binary stars resolved in precision astrometry catalogs of two epochs