The star appears to have been cut off from the link, leaving an article about the corresponding radio source, Sagittarius A. This (official Wikipedia) short link leads to the desired article: https://w.wiki/5A7e
HN escaped the * when I posted. I tried to escape the escape, but it kept adding escapes to my escapes. After a while I conceded defeat and decided folks might enjoy taking the scenic route through disambiguation.
I never got in the habit of using share links, so it's interesting to learn Wikipedia has a URL shortener.
https://en.wikipedia.org/wiki/Sagittarius_A*