SMSS J215728.21-360215.1

SMSS J215728.21-360215.1, commonly known as J2157-3602, is one of the fastest growing black holes and one of the most powerful quasars known to exist. The quasar is located at redshift 4.75, corresponding to a comoving distance of $25,000,000,000 ly$ from Earth and to a light-travel distance of $12,500,000,000 ly$. It was discovered with the SkyMapper telescope at Australian National University's Siding Spring Observatory, announced in May 2018. It has an intrinsic bolometric luminosity of $695,000,000,000,000 Solar luminosity$ ($266,000,000,000,000,000,000,000,000,000,000,000,000,000 W$) and an absolute magnitude of -32.36.

In July 2020 the black hole associated with the quasar was reported to be 34 billion solar masses, based on a study published in Monthly Notices of the Royal Astronomical Society.