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NGC 6888 The Crescent Nebula
The unique Crescent Nebula is about 5000 light-years and contains a Wolf-Rayet star in the core. WR 136 is approximately 4.5 million years old and ending it’s life as it heads toward becoming a supernova. WR 136 became a red supergiant about 120-240,000 years ago and blew a shell of material causing shockwaves and a unique aspect to the Crescent nebula. Another interesting aspect to this is that WR 136 may be a binary partner with a fast orbiting companion star.
Location
Location: Pendleton, Oregon
Observatory: ASG Dual Dome Observatory
Bortle: 4
Equipment
Telescope: Celestron RASA 11 (620mm focal @ f/2.2)
Filters: Astronomik MaxFR 50x50mm Square SHO & Deep Sky RGB
Main Camera: ZWO ASI 6200mm-pro Monochrome
Tilt & BackFocus Adjuster: ASG Electronically Assisted Tilt (EAT)
Mount: iOptron CEM 120EC
Guide Scope: William Optics 50mm Uniguide
Guide Camera: ZWO ASI 290mm-mini
Processing Software: Captured with NINA, Stacked with Astro Pixel Processor, Processed in PixInsight
Acquisition
Date: May 30th, 2023
R: 62 x 30 seconds
G: 57 x 30 seconds
B: 81 x 30 seconds
Ha: 27 x 300 seconds
Oiii: 21x 300 seconds
Total Integration time ~5.6 hrs
Calibration Bias: 20
Calibration Dark: 20
Calibration Flats: 20 for each filter