More than a year ago I registered PMAK V27 (https://www.aavso.org/vsx/index.php?view=detail.top&oid=844387), a variable that I found in my DSLR frames of the T UMi field.
Now, as far as new data become available (more ASAS-SN observations, ZTF points, and even a handful of observations posted to the AAVSO database by SFRA observer), and (that is even more important) I gained experience, I decided to work with it some more.
Here is the combined light curve:
DC DFT analysis (VStar) showed a clearly-visible peak corresponding to a period near 2.4 days. After removing the slow trend the peak became even more prominent.
Then I built a phase plot:
Now it looks like a phase plot of a rotating star with spots!
So, the star was reclassified as BY (thanks to Sebastian Otero for the final decision).
