About image SH2-188 is a faint planetary nebula visible in the constellation of Cassiopeia. Although it has been included in the Sharpless Catalog, it is actually a planetary nebula, located 711 light years away from the Solar System. It appears as a well-marked envelope on the eastern side and very dispersed on the western side, where it seems to have already dissolved. Through its speed of expansion an age of about 7,500 years has been determined.
Technical data Optic Tecnosky Acromatic Refractor 152/900mm f/5.9 Mount Losmandy G11 with Ovision worm and FS2 Camera Atik 4000 with external filter wheel Starlight Express 5 positions Filters Baader 50.8 unmounted Guiding system OAG Starlight Xpress + Lodestar Exposure details Ha 30x900" bin1 -20C OIII 15x900" bin1 -20C Total integration 11.2h Acquisition Maxim, PHD2 Processing Pixinsight 1.8, Photoshop CS5 SQM-L 18.37 Location Home terrace (Rescaldina, Italy) Date 23/24/27 August 2016