UBVRI PHOTOMETRY OF BETELGEUSE OVER 23 YEARS SINCE 1999

We report the results of our continuous UBVRI-band photometry Betelgeuse from 1999 to 2022 using same photometric system. There are two advantages in observation: (1) we used a photodiode as detector avoid saturation, and (2) data set includes U-band light curve, which is not widely observed recent CCD photometries. Using curves, conducted periodicity analysis, found ~405- ~2160-day periods. also discuss tentative detection long-period variation over 20 years or longer. Finally, peculiar U-B color index during "Great Dimming" event between late 2019 early 2020.