In Fronn (near SE corner of map) there's a hidden cache in an asteroid containing a Wyvern and several prototype systems about three squares south of the Fronn Triad station, and one square east.
How I found it? There were beacons laying about, but there were too many other asteroids about to properly make sense of them, so I started blowing asteroids up. I had cleared about 60% of the map of asteroids when I found the cache.
