IC 443, the Jellyfish Nebula

IC 443, the Jellyfish Nebula is a galactic supernova remnant in the constellation Gemini. (TheSky, Software Bisque)

This image is a narrowband image. Ionized gases in this nebula produce three prominent emissions: Hydrogen Alpha (656.3 nm), Sulfur II (672 nm) and Oxygen III (500.7 nm). I used the Seti Astro Foraxx Palette to map these emissions to RGB image channels. The mapping is as follows:

Red: Sulfur II (672 nm)

Green: Hydrogen Alpha (656.3 nm)

Blue: Oxygen III (500.7 nm)

Bottom line, this mapping communicates the composition of different regions in the nebula. It does not represent the way the nebula appears to our eyes.

Image processed by Andrew Macica, original data from Telescope Live.

Imaging Details:

Observatory: Astrocamp, Nerpio, Spain

Telescope: ASA N10 250

Aperture: 250 mm, f/3.6

Focal Length: 900 mm

Camera: Player One Mono 571 CMOS

Filters: Nebula - Halpha, OIII; Stars -RGB

Total Exposure: 27 hours 11 minutes

Image Processing:

PixInsight 1.9.3 Lockhart (x64);

BlurXTerminator, NoiseXTerminator, StarXTerminator (RC Astro);

Adobe Photoshop 25.12.4;

Adobe Lightroom Classic 15.4.1

Instruction on PixInsight from Adam Block Studios.