Let me guess, planet Seres 2 and star Seres orbit around Sunyessystem around Blackeshelsystem if it's in my mod. Otherwise, what is the mod ?
It is no addon.
It is a catalog star with procedurally generated planets.
If add-ons are used, it is of course possible that this star system was changed.
It is no exoplanet.
There is, as I said, something in the image that makes it possible to guess the star. Even if it would be not a catalog star.