On the morning of Feb 12, we obtained a lightcurve of ASASSN-18vi/ZTF18abtudfk with KPED (https://kped.org/).%C2%A0 We used g-band and a 10s cadence with a total duration of 1hr. The lightcurve shows a clear periodic signal with a period of 16.3+/-0.2 minutes and an amplitude of 2.2+/-0.7%. This strongly suggests this object is an AM CVn star; likely with an orbital period of 33 minutes.

Dr. Jan van Roestel, ZTF-collaboration