ZTF J210411.01-010202.3 = Gaia21fhx
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fhx/ Gaia21fhx AT2021afpm 2021-11-26 11:04:51 316.04638 -1.03367 15.17 unknown 2021-11-27 16:08:10 transient on blue PanSTARRS source, candidate CV
2MASS 210411.030 -010201.98 (2000.0) 16.605 15.908 15.659 210411.0 -010202 (2000.0) ZTFJ210411.01-010202.3 r=19.566 (18.456-19.939) P=0.0296 210410.999 -010202.33 (2000.0) Gaia_DR2_6917174984897161088 plx=1.906(0.408) dismod=8.6 pmra=0.711(0.799) pmdec=-15.658(0.716) G=19.443 BP=20.723 RP=18.266 210410.999 -010202.34 (2000.0) Gaia_EDR3_6917174984897161088 plx=2.116(0.328) dismod=8.4 pmra=0.956(0.329) pmdec=-14.974(0.268) G=19.416 BP=20.761 RP=18.273
Bright in 2MASS (but red). Dwarf nova with a long orbital period?