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Using the absolute astrometric positions and proper motions for common starsin the Hipparcos and Gaia catalogs separated by 24.75 years in the mean epoch,we compute mass ratios for long-period, resolved binary systems without anyastrophysical assumptions or dependencies except the presence of inner binarysubsystems that may perturb the observed mean proper motions. The mean epochpositions of binary companions from the Hipparcos Double and Multiple SystemAnnex (DMSA) are used as the first epoch. The mean positions and proper motionsof carefully cross-matched counterparts in Gaia EDR3 comprise the second epochdata. Selecting only results with sufficiently high signal-to-noise ratio anddiscarding numerous optical pairs, we construct a catalog of 248 binarysystems, which is published online. Several cases with unusual properties orresults are also discussed.

Astrometric mass ratios of 248 long-period binary stars resolved in Hipparcos and Gaia EDR3