OJ 287
OJ 287 is a BL Lac object located 3.5 billion light-years away 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. 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.
Q195385
BL Lac object
Concept
Q16021
billion
Concept
Q531
light-year
Concept
Q7080899
Ohio Sky Survey
MISC
Q40392
supermassive black hole
Concept
Q580394
OJ 287
CEL
1891-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1891
DATE
1887-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1887
DATE
+3.5^^http://www.w3.org/2001/XMLSchema#decimal
3.5
NUMBER
instance of