Since I can just look in the db to find them, I flew to the first artifact. Planet_196 on Irkalla and I can see it fine. It's at G 1,0 S 3,23 the yellow sun with one planet in the very bottom left of the map. If you don't see it, then I'll have to do some digging.
Edit: According to the db, Irkalla has 11 artifacts.