S5 0014+81
S5 0014+81 is a distant, compact, hyperluminous, broad-absorption line quasar or blazar located near the constellation Cepheus.
S5 0014+81 is one of the most luminous quasars known, with a total luminosity of over 10^41 watts, equal to an absolute bolometric magnitude of -31.5.
If this quasar were at a distance of 280 light-years from Earth, it would give as much energy per square meter as the Sun despite being 18 million times more distant.
In 2009, a team of astronomers using the Swift Spacecraft used the luminosity output of S5 0014+81 to measure the mass of the central black hole. They found that the central black hole of S5 0014+81 is actually 10,000 times more massive than the black hole at the center of our galaxy.
The Schwarzschild radius of this black hole is 118.35 billion kilometers, an external horizon showing a diameter of 236.7 billion kilometers, 1,600 astronomical units, or 37.4 times the diameter of Pluto's orbit.
S5 0014+81, which is located some 12.1 billion light-years distant, is thought to be the largest supermassive blackhole known.
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