Changing Looks of the Nucleus of Seyfert Galaxy NGC 3516 during 2016–2020

The results of spectral observations of NGC 3516 with the 2-m telescope of the Shamakhy Astrophysical Observatory during 2016–2019 are presented. In the first half of 2016, the intensive broad component H $$\beta $$ was found, which indicates a spectral type change compared to 2014, when the broad component was almost invisible. In the second half of 2016, the broad component H $$\beta $$ again was weakened and was practically not observed, remaining weak until the end of 2019. At the end of 2019, the broad component H $$\beta $$ strengthened again, and in May 2020 reached a typical level for the high state of the object. During 2016–2020 we observed several changing looks of NGC 3516.