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HIP 53731 is a binary consisting of stars of the spectral types K0 and K9.Orbit of this object was constructed previously by Cvetkovi'c et al. (2016) andimproved by Tokovinin (2019). It should be noted that there is an 180 degreeambiguity in the position angles of some published measurements. Speckleinterferometric observations were obtained in 2007-2020 (21 measurements) atthe 6-m telescope of the SAO RAS (BTA) by the authors of this article. Theanalysis of new data together with previously published ones made it possibleto construct the accurate orbit of HIP 53731 and to halve the already knownvalues of the orbital period of the system. As a result of the study, the masssum, the masses of each component and their spectral types were determined bytwo independent methods. According to the qualitative classification of orbits,the orbital solution has grade 2 - "good" (observations cover more than half ofthe orbital period and correspond to different phases).

On the correctness of orbital solutions obtained from a small set of points. Orbit of HIP 53731