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



    
        

            Edward Overstreet
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NGC 6888 Crescent Nebula

Getting plate-solving status, please wait...
NGC 6888 Crescent Nebula, 



    
        

            Edward Overstreet
Powered byPixInsight

NGC 6888 Crescent Nebula

Imaging telescopes or lenses: Celestron EdgeHD 800

Imaging cameras: ZWO ASI1600MC-PRO

Mounts: Orion Atlas Pro AZ/EQ-G Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: ZWO 60mm f/4.6 Guidescope

Guiding cameras: Starlight Express Loadstar X2

Focal reducers: Celestron C8 Edge HD 0.7x Focal Reducer

Software: PixInsight Pisinsight 1.8  ·  Adobe Photoship CC 2015  ·  Cartes du Ciel  ·  Sequence Generator Pro  ·  EQMOD  ·  PHD 2

Filters: Astronomik HA, OIII, SII

Accessory: Moonlite 2.5" AutoFocuser  ·  ZWO 7 Pos. Filter Wheel  ·  Gerd Neumann Flat Field Panels Light Panel


Dates:Nov. 9, 2020

Frames: 110x300" (9h 10')

Integration: 9h 10'

Darks: 30

Flats: 150

Flat darks: 150

Avg. Moon age: 23.11 days

Avg. Moon phase: 39.87%

Bortle Dark-Sky Scale: 5.00

Mean FWHM: 3.65

Temperature: 17.00


RA center: 20h12m11s.619

DEC center: +38°1953.46

Pixel scale: 0.517 arcsec/pixel

Orientation: 23.919 degrees

Field radius: 0.386 degrees

More info:Open 


Resolution: 4340x3184

Locations: Observatory, Spartanburg , South Carolina, United States

Data source: Backyard

Description

The Crescent Nebula, NGC 6888 or Caldwell 27, is an emission nebula in the constellation Cygnus.

About 4,700 light years away, NGC 6888 is formed by a fast stellar wind from the Wolf-Rayet star HD 192163, also known as WR 136. The star is shedding its outer envelope, ejecting the equivalent of the Sun's mass every 10,000 years. This stellar wind is colliding with, and energizing, a slower-moving wind ejected by the star when it became a red giant around 400,000 years ago. The result of the collision is a shell about 25 light-years across. Two shock waves, one moving outward and one moving inward, heats the stellar wind to X-ray-emitting temperatures. The central star WR 136 will probably undergo a supernova explosion sometime in the next million years.

Credits: Sky Safari Pro 6

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NGC 6888 Crescent Nebula, 



    
        

            Edward Overstreet