I have:
Merope 5 C (-25.34),(158.48)
Merope 5 C (-26.35),(-156.41)
Pleione 11 A (0.82),(176.56)
Pleione 11 A (2.32),(177.24)
Pleiades Sector JC-U b3-2 1 (19.25),(92.09)
Pleiades Sector JC-U b3-2 1 (20.86),(91.68)
Pleiades Sector JC-U b3-2 1 (20.86),(91.73)
Pleiades Sector JC-U b3-2 1 (21.33),(91.98) - verified by myself
Pleiades Sector JC-U b3-2 1 (21.91),(96.98) - verified by myself
Pleiades Sector JC-U b3-2 1 (21.93),(96.98) - verified by myself
Pleiades Sector JC-U b3-2 1 (23.09),(94.08)
Pleiades Sector JC-U b3-2 1 (25.34),(25.53)
Pleiades Sector JC-U b3-2 1 (-57.83),(107.43)
Crashed Anaconda: Pleiades Sector JC-U b3-2 1 (20.8736),(91.6983)
Pleiades Sector JC-U b3-2 2 (49.53),(102.08) - verified myself
Pleiades Sector JC-U b3-2 2 (49.75),(102.16) - verified myself
Pleiades Sector JC-U b3-2 2 (49.91),(102.71) - verified myself
One trick I've been using is to land at the given co-ords minus a bit -
Given: Pleiades Sector JC-U b3-2 1 (21.33),(91.98)
Land: (21.90),(90.98)
- and then pop into open. If you see the barnacles, make note of heading or move the ship so that the barnacles are right in front of you (back a bit, though, to allow for other ships to land or that you are not on top of them, which would make them disappear). Then pop into solo or a private group (I made one of just myself) and see if they appear. I know I had to relog (from the main menu & also from the Launcher) several times before they appeared in my Private Group; same for other folks.
This at least would let you know if you're in the neighborhood; I have not had one fail when in open. Saves a lot of "am I in the right place?" frustration.
Tip: Pleiades Sector JC-U b3-2 "barnacle zone" is a muddy canyon bottom - your ship will sink past the "foot" of the landing gear, making it difficult or impossible to either launch the SRV or return to the launch bay. You'll have to dismiss it and then recall it and hope it lands with better clearance for the SRV.
Good hunting!