FitzTheRuke
Legend
there might be some confusion. Soji's system is not the 8-star system with the Admonition thingy. I'm talking about that system specifically because it's something astronomers of StarTrek tech level would have seen from anywhere in the galaxy during mapping.
Oh right. For some reason I conflated the two. At any rate, there's a whole lot of reasons it could have been off federation star-charts. Or on them but not well-known.