Prawn Nebula in Emission Line Color - Adam Lundie - Eatons Hill Observatory

Prawn Nebula in Emission Line Color

Prawn Nebula in Emission Line Color thumbnail
Prawn Nebula in Emission Line Color
IC 4628, sometimes known as The Prawn Nebula, is an emission nebula located around 6000 light-years away in the constellation Scorpius
This image combines sulfur, hydrogen and oxygen emission lines mapped to red, green & blue. An emission line will appear in a spectrum if the source emits specific wavelengths of radiation. This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy. For a natural color view, see here


  • 39x 600s Sulfur-II
  • 15x 600s Hydrogen-alpha
  • 37x 600s Oxygen-III

Total integration 15 hours, 10 minutes.


  • Skywatcher Black Diamond 80ED
  • Skywatcher EQ8 Pro mount
  • QSI 683-ws8 Camera @ -15°C
  • Astronomik 6nm SHO filters
  • Starlight Xpress Lodestar X2 Autoguider
  • Innovations Foresight On Axis Guider
  • Starlight Instruments Focus Boss II


  • Orange zone in Brisbane, Australia. (Bortle 7)


  • Planning & camera alignment with Aladin 10
  • Captured with TheSkyX Professional
  • Guiding with PHD2
  • FocusLock live focusing
  • PixInsight: calibrate, align, stack, crop, dynamic background extraction, pixelmath combine SHO, SCNR green, noise reduction, stretch, curves.