This nebula was discovered by Williamina Fleming in 1907.
The nebula is 6800 light-years away and the main central bright shell is 7 arcseconds in diameter, the faint OIII halo is approximately 45x30 arcseconds in south direction.
The extremely faint extended Ha regions are about 3 arcminutes in size and might represent external ancient ejecta associated with IC 4191.
The extended features marked in the white box in the contrast enhanced bottom image were discovered by the amateur astronomer Sakib Rasool in August 2013.
Find a Hubble image of the bright central part of this nebula here
Ha-OIII-RGB (Ha 8x40m, OIII 7x40m, RGB each 5x20m) Seeing 0.8-1.2 arcsec, North is up
80cm f/7 Astrooptik Keller corrected cassegrain, FLI Proline 16803, Astrodon Filters, Prompt 7 CTIO Chile
Processing: Johannes Schedler