ASASSN-21tg: new SU UMa-type dwarf nova

Josch Hambsch has reported further observations. The object showed superhumps on Oct. 17. The period is not well determined, but is close to 0.1 d. The current amplitude is 0.2 mag. The object is not an AM CVn star as initially suggested from the decline rate of the precursor. The very rapid deline for this orbital period is exceptional. Further observations are needed.