What if owners of unknown probe and unknown artifact are simply interested in Merope 5C cos they found barnacels like we did.
They established perimeter around this system, a shel 150ly radius in hope that the creators of barnacels will show up. So unknown artifacts scan every space craft they encounter but our ships clearly aren't the thing they are looking for so they remain dormant.
Unknown probe looks like orbital probe. It have instructions to find Merope 5C and establish orbit around it then scan activity in the vicinity of the planet. Nothing more. They aren't interested in us at all. We could probably use reverse engineering and crack those instructions to find it's origin. But it may be imposible.
Now the real question is why there are no uknown probes in orbit of Mereope 5C? There are so many people flying in this sytem. Surely someone would found some till now.
So we also have those Farragut class ships in the system. Could it be that feds captured all of them? Maybe activity of capital ships in nearbay systems is a clue where to look? Have anyone chcked that?
I've been thinking along the same lines whilst lurking (no time to play recently).
Like no doubt numerous others way before me, my hunch (or more accurately serious of hunches are):
1. The UA shell is arranged as some kind of perimeter/boundary/demarkation/net either in reaction to us finding barnacles; OR something 'they' (Paul/INRA/Missing/Others) expect to find related to them (but for this to be true the barnacles in other nebulae may need another explanation - which Occam's Razor doesn't like very much - unless they just spread?)
2. The UP is hunting for something, and Merope 5C is just the first place it looks (see point 1) but maybe that is because that is where we found a barnacle first and the convoy captured ones we have access to so far are now expended or 'locked' in some way; Speculation: maybe 'wild' free floater UP will have other/further instructions where to look (i.e. different pointing behaviour or a different/variable message) - although I'm not convinced MB's comments exactly support this idea
3. That although the old lore is now in question, I can't help suspecting Pleione due to it's previous connections to Thargoid ships/wrecks; also Pleione 4 in particular is a very cool looking location (which I know was searched during the hunt for barnacles, but still); I
have searched the system a couple of times but not exactly extensively. No I can't come up with a theory that makes the UP message lead there, and in any case that would be bad science!
4. That the resistant cargo racks and KEY hint suggest the UP will need to be taken somewhere to trigger/enable something at some point. Eg. Honking a wild UA while carry an UP to get a new message (I give that about a 1:100 probability of working, hopefully something more interesting)
None of this is new, clever or novel thinking, (or really helps at all), but hoping tomorrow will bring something new to the mix...