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The third realization of the International Celestial Reference Frame (ICRF3)was adopted in August 2018 and includes positions of extragalactic objects atthree frequencies: 8.4 GHz, 24 GHz, and 32 GHz. In this paper, we presentcelestial reference frames estimated from Very Long Baseline Interferometrymeasurements at K-band (24 GHz) including data until June 2022. The data setstarts in May 2002 and currently consists of more than 120 24h observingsessions performed over the past 20 years. Since the publication of ICRF3, theadditional observations of the sources during the last four years allowmaintenance of the celestial reference frame and more than 200 additional radiosources ensure an expansion of the frame. A study of the presented solutions iscarried out helping us to understand systematic differences between theastrometric catalogs and moving us towards a better next ICRF solution. Wecompare K-band solutions (VIE-K-2022b and USNO-K-2022July05) computed by twoanalysts with two independent software packages (VieVS and Calc/Solve) anddescribe the differences in the solution strategy. We assess the systematicdifferences using vector spherical harmonics and describe the reasons for themost prominent ones.

The K-band (24 GHz) Celestial Reference Frame determined from Very Long Baseline Interferometry sessions conducted over the past 20 years