Astrobin link

The Cygnus Loop is a spernova remnant in the Cygnus constellation. The nebula is massive, much larger than the full moon in the sky. It is about 120 light years in diameter and over 2,000 light years away from the Earth. This data is a false color image consisting of Hydrogen and Oxygen emissions along with true-color RGB stars. Was taken over most of the month of July 2023.

My Gear:

• Redcat 51 II APO 250mm f/4.9
• iOptron CEM120 mount
• Custom fabricated steel pier mounted to a concrete pier
• ROR Observatory based on Skyshed plans

Aquisition (per panel):

• 38x180s Chroma Blue
• 38x180s Chroma Red
• 37x180s Chroma Green
• 73x600s Chroma Ha 3nm
• 73x600s Chroma OIII 3nm

Total integration time: 29 hours 59 min

Site quality: On the best nights, roughly 20.4 Mag/arcs^2 or Bortle 5.0.

All Processing is in Pixinsight except where noted.

PreProcessing (all channels):

• WBPP for calibration, registration, and integration
• Dynamic Crop

RGB Stars:

• Linear fit of the three channels
• Channel Combination
• BlurXTerminator to reduce and sharpen stars
• NoiseXTerminator
• Histogram Transformation

Ha, OII:

• StarXTerminator star removal
• Dynamic Background Extraction
• NoiseXTerminator
• Histogram Transformation
• Pixelmath combine to HOO
• Curves to tweak color
• BlurXTerminator sharpening
• Pixelmath to add stars
• Curves Transformation for brightness/contrast/saturation/color balance
• Resample 66%
• NoiseXTerminator
• Watermark added (Gimp)

What about tipping points? I hear about ice cover, ocean currents, and other systems where once we get past a tipping point, additional warming is self sustaining. At that point it doesn’t matter if we have our brakes on, we’ve gone over the cliff right?