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This paper details speckle observations of binary stars taken at the LowellDiscovery Telescope, the WIYN Telescope, and the Gemini telescopes between 2016January and 2019 September. The observations taken at Gemini and Lowell weredone with the Differential Speckle Survey Instrument (DSSI), and those done atWIYN were taken with the successor instrument to DSSI at that site, theNN-EXPLORE Exoplanet Star and Speckle Imager (NESSI). In total, we present 378observations of 178 systems and we show that the uncertainty in the measurementprecision for the combined data set is ~2 mas in separation, ~1-2 degrees inposition angle depending on the separation, and $\sim$0.1 magnitudes inmagnitude difference. Together with data already in the literature, these newresults permit 25 visual orbits and one spectroscopic-visual orbit to becalculated for the first time. In the case of the spectroscopic-visualanalysis, which is done on the trinary star HD 173093, we calculate masses withprecision of better than 1% for all three stars in that system. Twenty-one ofthe visual orbits calculated have a K dwarf as the primary star; we add theseto the known orbits of K dwarf primary stars and discuss the basic orbitalproperties of these stars at this stage. Although incomplete, the data thatexist so far indicate that binaries with K dwarf primaries tend not to havelow-eccentricity orbits at separations of one to a few tens of AU, that is, onsolar-system scales.

Observations with the Differential Speckle Survey Instrument. X. Preliminary Orbits of K Dwarf Binaries and Other Stars