This is the first discovered variable star discovered in the new field TF15C. This is the GPX-TF15C-7995 (GSC 03975-00415 in Cepheus) a typical EA system discovered during the GPX survey and submitted to VSX by P. Benni, A. Burdanov, F. Salvaggio, A. Marchini, R. Papini.
Magnitude variations goes from 13.39 to 14.13 V, with the same secondary minima.
Epoch: HJD 2458337.743
Period: 1.67576 d
This is the link to VSX record: https://www.aavso.org/vsx/index.php?view=detail.top&oid=689726