Evaluation of terrestrial and celestial reference frames estimated from VGOS data

The new VLBI system, VGOS, has been observing regularly since the beginning of 2019. Thus, there are now six years of data available from VGOS, what should be enough to estimate relatively stable reference frames. In this work we do a global solution with the ASCOT software, using all available VGOS data, to estimate a Terrestrial Reference Frame (TRF) and a Celestial Reference frame (CRF). Those frames are then compared to the ITRF2020 and the ICRF3, respectively. We also compare to our own TRF and CRF solutions estimated with ASCOT using legacy S/X data. The results provide information on the strengths and weaknesses of VGOS when estimating reference frames, as well as on how much the radio source positions differ between the VGOS and S/X frequencies.