• 6888 in Cygnus, the Crescent Nebula
    • NGC 6888 in Cygnus, the Crescent Nebula
    Annotated image
  • NGC 6888, the Crescent Nebula in Cygnus,
  • is an emission nebula 5 kly from us.
  • Hover over the image for an annotated view.
  • Date:  22 July 2025
  • FOV:  cropped to 90' × 60'; the angular size of NGC 6888 is about 18' × 12'
  • Telescope:  Celestron C14 SCT (3910mm, f/11)
  • Starizona HyperStar (731.83mm, f/1.9)
  • Guiding:  ZWO2600 MC Duo internal ASI220MM mini
  • Computer:  ASIair plus 256GB
  • Mount:  iOptron CEM120
  • Camera:  ZWO ASI2600 MC Duo Cooled (0°C) Color CMOS gain 100
  • Pixel size:  3.76 μm
  • Resolution:  1.060 arcsec/pixel
  • Filter:  Optolong UV/IR cut
  • Frames:  sixty-six 180 second subs
  • Total Time:  3 hours and 18 minutes
  • Calibration:  20 flats, 20 dark flats, and 20 darks
  • Processing:  Pixinsight – SPCC, DBE, SPCC, BlurXT, NoiseXT → Linear
  • MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat
  • StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless
  • PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Darling Hill Observatory near Vesper, NY