In the data base of variable stars of the VSX, this star is known as Gaia DR2 422872584363095808, type SR with a period of 543.78d and range 15.8-16.7 Vmag. But in this case, the star behaved strangely, in one day, it lost almost 1.5mag brightness in the R filter.
The loss of brightness per day is almost 1.5mag. The type SR star has unusual behavior. This drop in brightness is within the range of brightness variation, but it should occur in half the period (272 d), not one day.
04 August 2020 the star regained its brightness. Today brightness dropped again. I checked my archive for August 2019. This star did not show such activity and was stable.
2MASS J00100609+5813196 | 20200802.93 | 14.32 | 0.03 | R |
2MASS J00100609+5813196 | 20200803.91 | 15.67 | 0.05 | R | Lost almost 1.5 mag.
2MASS J00100609+5813196 | 20200804.85 | 14.30 | 0.02 | R |
2MASS J00100609+5813196 | 20200805.90 | 15.67 | 0.04 | R | Lost 1.37 mag.
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