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