It was found in Messier 87, a galaxy 55 million light-years away. Now, it's not the most massive black hole ever detected - that would be the quasar TON 618, which apparently has a black hole clocking in at 66 billion times the mass of the Sun, based on indirect measurements.. The cluster is 700 million light-years from Earth â- thatâs twice as far as the distance for other direct measurements of black hole mass. It briefly shot to fame when it was reported to have the largest core ever observed in a galaxy, spanning some 15,000 light years, however this was subsequently refuted. A follow-up study of the cD galaxy Holm 15A in order to prove whether J004150 is a background source or a bound black hole, which could be tested by optical spectroscopy of J004150. Much like stars and planets, black holes also fall into different categories. For this, Holm 15A represents an ideal opportunity for testing the SMBH âscouringâ scenario for the creation of BCG cores. Black holes this size are called supermassive black holes, and only a few of these have been found. Astronomers have now spotted a record-breaking heavyweight black hole at the center of a galaxy known as Holm 15Aâ¦ Holmberg 15Aâs ultramassive black hole is estimated to have a mass of 40 billion times that of the Sun. The gargantuan black hole lurks in a galaxy thatâs supermassive itself and probably formed from the collisions of at least eight smaller galaxies. Holm 15A is more than twice as large as the previous observed record-setter at 40 billion times the mass of the Sun, and 10,000 times the mass of the black hole at the core of the Milky Way. It was discovered c. 1937 by Erik Holmberg. Much like stars and planets, black holes also fall into different categories. The discovery of the supermassive black hole in Holm 15A follows research published in the Monthly Notices of the Royal Astronomical Society in 2018. Holm 15A is a central elliptical galaxy within the Abell 85 cluster, which contains more than 500 galaxies. And then there's the ultramassive black hole powering the quasar TON 618 - an absolute beast at 66 billion solar masses. Holm 15A* is estimated to have a mass 40 billion times that of the sun. Holmberg 15A is a supergiant elliptical galaxy and the central dominant galaxy of the Abell 85 galaxy cluster in the constellation Cetus, about 700 million light-years from Earth. An ultramassive black hole clocking in at around 40 billion solar masses is at the heart of the galaxy Holm 15A, around 700 million light-years away. Astronomers have now spotted a record-breaking heavyweight black hole at the center of a galaxy known as Holm 15A. The radius of the black hole is about radius is about 790 Astronomical unit (AU). This makes the Holm 15A black hole twice as big as the last record holder and 10,000 larger than the black hole in the center of our own Milky Way. It's 10.4 billion light-years away. The black hole was spotted by using data from the Very Large Telescope array. But it was the center of Holm 15A â¦ Event Horizon Telescope Collaboration, via National Science Foundation The first ever-image of a black hole, captured in April, 2019.