Zola, S.Valtonen, M.Bhatta, G.Goyal, A.Debski, B.Baran, A.Krzesinski, J.2025-01-272025-01-2720162075-4434https://doi.org/10.3390/galaxies4040041https://hdl.handle.net/20.500.12428/23295We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically significant periods were found in the high-frequency domain both in the ground-based data and in Kepler observations. In the longer-period domain, the Lomb-Scargle periodogram revealed several peaks above the 99% significance level. The longest one-about 95 days-corresponds to the innermost stable circular orbit (ISCO) period of the more massive black hole. The 43-day period could be an alias, or it can be attributed to accretion in the form of a two-armed spiral wave.eninfo:eu-repo/semantics/openAccessgalaxies: activeBL Lacertae objects: individual (OJ287)supermassive black holesArticle4410.3390/galaxies4040041N/AWOS:0003910040000092-s2.0-85041040779Q2