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The bright blazar OJ 287 is the best-known candidate for hosting a nanohertzgravitational wave (GW) emitting supermassive binary black hole (SMBBH) in thepresent observable universe. The binary black hole (BBH) central engine model,proposed by Lehto and Valtonen in 1996, was influenced by the two distinctperiodicities inferred from the optical light curve of OJ 287. The currentimproved model employs an accurate general relativistic description to trackthe trajectory of the secondary black hole (BH) which is crucial to predict theinherent impact flares of OJ 287. The successful observations of threepredicted impact flares open up the possibility of using this BBH system totest general relativity in a hitherto unexplored strong field regime.Additionally, we briefly describe an on-going effort to interpret observationsof OJ 287 in a Bayesian framework.

The Unique Blazar OJ 287 and its Massive Binary Black Hole Central Engine