Long term UBV RI photometric and spectral monitoring of nova KT Eri during 2009-2023

We present a status report of our intensive and long-term UBV RI photometric monitoring of nova KT Eri since its outbust in 2009. The old-nova in quiescence is characterized by very high excitation conditions (HeII 4686 being constantly the strongest emission line in optical spectra) and a complex-pattern photometric variability of one mag amplitude in which multi-periodicities (from hours to years) are mixed with chaotic activity of similar amplitude. Mean color and brightness levels are the same for pre- and post- outburst quiescence.