Since 2.3 went live, CDMR’s have found 32 of these bases. EDSM has been updated.
Asteroid bases have been added to the galaxy since update 2.3. These new additions make for some stunning visuals. Here I will list the ones that I have found on my travels. The two I highly recommend you go check out are the ones in the heart and soul nebula’s.
There is a neat little trick to locating Asteroid Bases on the galaxy map :
Filter > Economy > Select all
. . . look for red dots near nebula’s