edit the bbc article got it wrong withe 30 billion times the size and it supposed to be 30 billion solar masses see [1] or the arxiv article [2]

The bbc article says 30 billion times the size while TON618 is 66 billion times the mass.

Wikipedia says TON618 has a Schwarzschild radius of 1,300 AU (390 billion km in diameter) vs teh sun's 1.3927 million km diameter. Which makes TON618 ~280k bigger than the sun.

So if my math is right that makes the Ultramassive balck hole in the bbc article ~107k larger than TON618.

edit give the R = 3M relation for black holes twice the radius means twice the mass. So 107K times the radius means 107k times the mass.

The Ultramassive balck hole in the bbc article would have ~2354000 billion solar masses.

edit give the above I want to fact check BBC's 30 billion times the size vs 30 billion solar masses since the later seems more reasonable.

edit 30 billion solar masses is what is given directly by durham and arxiv[2]

[1] https://www.durham.ac.uk/news-events/latest-news/2023/03/lig... [2] https://arxiv.org/abs/2303.15514