FG Sge is one of the most unique variable stars known.  Evolving as we watch, it's variations are totally unpredictable.  Before 1992,  FG Sge spent many years as a magnitude 9 star. The star has also evolved and cooled from a B type star to it's present type K2 in just over a century.  Theory speculates as to whether FG Sge is an evolving RCB star.  It's the central star of the Planetary Nebula PK060.3-07.3

Low states are a good time to try to capture the associated Planetary Nebula PK060.3-07.3.  This 50 second exposure with the Bradford Robotic Telescope (North to top, East to left), reveals the 30 arc second 16th magnitude elusive nebulosity. (Aug 19.072UT, 2009).  FG Sge is arrowed (Mag C=17.3)