Celaeno (and the Pleiades) form a part of the Cthulhu mythos.
A recurring theme of Lovecraft is that the Old Ones, Cthulhu and his pals, like nothing better than residing in the deepest darkest places, waiting and watching. Read The Haunter Of The Dark short story.
Slap bang in the Pleiades, within Maia, is a a very deep dark place. A black hole. None of the planets around it receive much light at all, except from the nebula.
It is also the location of Palin's new research base. Maia is totally enveloped by the nebula.
Looking for them and poking them has consequences. The UA have been watching us from their dark places for a long time.
It is probably not a coincidence that the UA look like an octupus with it's tentacles chopped off.
I have been searching for a while using the Lovecraftian clues (and all over the nebula). Maia B1g and B1f are the creepiest looking bodies I have been on.
Unfortunately they are too big and I am too little. My biggest fear is that the random spawn rate has been set far too low (tea and ship debris in abundance though) and that there aren't enough of the fixed POI.
When the stars have aligned and enough of us believe in them, they will come forth...