OJ 287 (Primary BH)

Name: OJ 287 (Primary BH) 

Alternate name: OJ 287

Category: Blazar (Supermassive Black Hole; ~18.45 billion solar masses)

Distance from Earth: 5 billion light years

First Discovered: ~1960 (was however first observed in photographic images from 1888)

Discovered by: Big Ear Radio Observatory

Galactic Longitude: 207.17° 

Galactic Latitude: 36.71°

This article describes the primary black hole of the OJ 287 system. The primary black hole of OJ 287 is in a binary system with a secondary, less massive black hole: