OJ 287
OJ 287 is a BL Lac object 5 billion light-years from Earth that has produced quasi-periodic optical outbursts going back approximately 120 years, as first apparent on photographic plates from 1891. Seen on photographic plates since at least 1887, it was first detected at radio wavelengths during the course of the Ohio Sky Survey. It is a supermassive black hole binary (SMBHB). The intrinsic brightness of the flashes corresponds to over a trillion times the Sun's luminosity, greater than the entire Milky Way galaxy's light output.
| OJ 287 | |
|---|---|
Comparisons of large and small black holes in galaxy OJ 287 to the Solar System | |
| Observation data (Epoch J2000) | |
| Constellation | Cancer |
| Right ascension | 08h 54m 48.9s |
| Declination | +20° 06′ 31″ |
| Redshift | 0.306000 |
| Distance | 3.5 Gly (1.073 Gpc) |
| Type | BL Lac |
| Apparent magnitude (V) | 15.43 |
| Other designations | |
| EGO 0851+202, 3EG J0853+1941, RGB J0854+201 | |
| See also: Quasar, List of quasars | |
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