New combined speckle/visual orbital elements are presented for 28 close binary systems with periods ranging from 2.7 to 213 yr and semimajor axes from 0.06 to 0.81 arcsec. New orbital results are presented for ADS 1105 = STF 115 AB, ADS 1473 = Ho 311, and ADS 14121 = Wck Aa, and the elements of a number of other systems have undergone major revisions. All orbits are equinox 200, and ephemeris tables based on these orbits provide predictions of separations and position angles for the next 5 to 40 yr, depending on the derived period. The orbit calculation method and the weighting scheme for the observations are discussed in detail.
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Hartkopf et al. (1989) studied this question.