ИСТИНА

The star V426 Sge (HBHA 1704-05) had been classified as an emission-line object until its first Z And-type outburst at the beginning of August 2018. We began to carry out regular multi-color photometric observations both in the optical (UBVRI) and the near-infrared (JHKL). In addition, we measured archival photographic plates collected at different observatories. In this way, we revealed a nova-like explosion in 1968, after which the system developed wave-like orbital-related variations with a period of 493 days, becoming a classical symbiotic star. In September 2023, V426 Sge experienced a new small outburst characterized with the amplitude of > 1 mag in U and lasting for only 2 months. We show the outburst's profile at different photometric passbands, changes in the color temperature from the two-color diagram, and present the SED based on our UBVRIJHKL photometry during the outburst and its decline. Our new photographic estimates from the archives of the Sonneberg and Asiago observatories confirmed the quiescent phase of V426 Sge as a classical symbiotic star.