Jeff-Relf.Me @. writes:

Sagittarius A* is THOUGHT to be the location of a supermassive black hole
https://en.wikipedia.org/wiki/Sagittarius_A*

"Thought", not "known".

"Thought" to a rather high degree of certainty.

Orbits of multiple stars are tracked orbiting "something"
with a mass of about 4.1 million solar masses but a radius of less than 45 AU
(otherwise the star S14 would collide with it).

https://upload.wikimedia.org/wikiped...tre_orbits.svg