Insofar as anything we have ever discovered, or thought we had discovered could be said to have been definitively established: Yes, the UAs point at Merope.Has it defo been established that they point at Merope and not away from it? Again not that it make much difference.
Whilst it still could possibly be that they are 'pointing the other way', if that is the case, they are pointing at pretty much everything else in the galaxy. Why do I say this? Because if you take one to Merope itself, and drop it, it will point at the star. Irrespective of where you are in relation to the rest of the galaxy. So you can drop it here : points at star. Pick it and drop it on the other 'side' of the star (i.e. diametrically opposite your first drop location): points at the star. Conclusion of this test? Either test subject (UA) points to two distinct locations in the galaxy on the grounds that the bulbous part is the 'tail', or it points at one, on the grounds that the bulbous part is the 'head'. On the assumption that pointing at pretty much everywhere is pretty much pointless (sic), the bulbous end is the pointer, and Merope is the 'target'.
Q.E.D.