U Mon
This RV Tau-type star was in an interchanged primary minimum (~7mag) on
March 16 (vsnet-campaign-rvtau
1). On interchanged minima I and II in RV Tau stars, T. Kato commented
that R Sct frequently shows consecutive minima II (vsnet-campaign-rvtau
2). T. Ishida commented that deterministic system with unpredictable
behavior (so-called "Chaos") is one of the possible cause of such an
irregularity (vsnet-campaign-rvtau
3).