OJ 287 is a blazar thought as a candidate to host a binary supermassive black hole (Valtonen et al. 2006) and, with a periodicity of 12-year in its optical wavelenght (Shi et al. 2007).
OJ 287 is a BL Lacertae type quasar situated at a redshift of z = 0.306 with RA: 08 h:54 m :48.87 s and Dec: +20° 06’ 30.6”.
Sloan Digital Sky Survey image of OJ 287
The figure shows panels of radio, optical, X-ray, and Gamma-ray light curves, waveforms of the sonification as a function of time, and spectrograms of the blazar OJ 287. The light curves are available at: Download Light curves.
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