Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  Crescent nebula  ·  NGC 6888  ·  NGC6888  ·  Sh2-105
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NGC 6888, the Crescent Nebula, 


            Patrick Hsieh
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NGC 6888, the Crescent Nebula

Imaging telescopes or lenses: Celestron C11 Edge HD

Imaging cameras: ZWO ASI6200MM-PRO

Mounts: Astro Physics AP Mach 1 GTO with GTOCP3

Software: Photoshop CS6  ·  Pleiades Astrophoto Pixinsight 1.8

Filters: Chroma 3nm Ha, Oiii, Sii

Dates:Oct. 13, 2020

Frames: 36x900"

Integration: 9.0 hours

Avg. Moon age: 25.73 days

Avg. Moon phase: 15.50%

Astrometry.net job: 3935201

RA center: 20h 12' 9"

DEC center: +38° 20' 13"

Pixel scale: 0.278 arcsec/pixel

Orientation: -0.535 degrees

Field radius: 0.417 degrees

Resolution: 9000x6000

Locations: Mojave Preserve, Baker, CA, United States

Data source: Traveller


Finally had a chance to grab some Oiii for this image, might add Sii in the future. Had lots of challenges with iffy seeing and guiding, but the ASI6200 does really well with a relatively small number of frames, I think the background/pattern noise is much lower than with the ASI1600.
25xHa, 600 sec
11xOiii, 900 sec



  • NGC 6888, the Crescent Nebula, 


            Patrick Hsieh
  • Final
    NGC 6888, the Crescent Nebula, 


            Patrick Hsieh


Description: Recombined using the PIP (power of inverted pixels) method I just found on TheColdestNights.com. Very pleased, encourage all to check out that method. https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/

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Sky plot

Sky plot


NGC 6888, the Crescent Nebula, 


            Patrick Hsieh