OJ 287
Encyclopedia : O : OJ : OJ2 : OJ 287
OJ 287 is a BL Lac object, with over 100 years of observational data. It has a periodic variation of 11-12 years. The variation suggests that a supermassive binary black hole is the engine, with an 11-12 year orbital period.
External links
- [Object: OJ 287] (SAO Observers)
- [A Supermassive Black Hole Pairing] (Centauri Dreams)
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