This section is dedicated to Planetary Nebula hunting in online survey images (DSS2, SDSS, Pan-STARRS1, WISE, Halpha images). All Planetary Nebulae [candidates] mentioned in this section have been discovered by Amateur astronomers online.
Examples of three circular Planetary Nebula candidates as seen in DSS2. Image credit: DSS2 Aladin Lite.
Pascal Le Dû’s website (In French): http://www.cielocean.fr