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Proceedings of 7th International Fermi Symposium — PoS(IFS2017)
The proper understanding of blazar variability at the various electromagnetic spectral bands is one goal of multifrequency astrophysics. In this frame a peculiar and controversial phenomenology is the periodicity, postulated for long-term radio or optical flux light curves of about a dozen of blazars. The well-known BL Lac object OJ 287 (PKS 0851+202, S3 0851+20, PG 0851+202, z = 0.306) is not only a high-variable, peculiar, extragalactic source with hints for approximatively cyclical opticaldoi:10.22323/1.312.0041 fatcat:edwnzw2vtzh3fozffzqqtm4mai