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The blazar OJ287 is the most promising (and the only) case for anextragalactic binary black hole system inspiralling under the action ofgravitational radiation reaction. At present, though it is not possible todirectly observe the binary components, it is possible to observe the jetemanating form the primary black hole. We argue that the orbital motion of thesecondary black hole is reflected in the wobble of the jet and demonstrate thatthe wobble is orbital position dependent. The erratic wobble of the jet,reported in Agudo et al. (2012), is analyzed by taking into account the binarynature of the system and we find that the erratic component of jet wobble isvery small.

Black hole binary OJ287 as a testing platform for general relativity