Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  27 b01 Cyg  ·  28 b02 Cyg  ·  29 b03 Cyg  ·  34 P Cyg  ·  36 Cyg  ·  37 gam Cyg  ·  B145  ·  B146  ·  B343  ·  B344  ·  Crescent Nebula  ·  Crescent nebula  ·  Cygnus  ·  IC 4996  ·  IC4996  ·  NGC 6871  ·  NGC 6888  ·  NGC6871  ·  NGC6881  ·  NGC6883  ·  NGC6888  ·  PK074+01.1  ·  PK074+02.1  ·  PK075+04.1  ·  PK076+01.1  ·  PK076+01.2  ·  PK077+02.1  ·  PK077+03.1  ·  PK077+03.2  ·  Sadr  ·  And 10 more.
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NGC6888 widefield HOO, 


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NGC6888 widefield HOO

Imaging telescopes or lenses: Jupiter 37a 135mm

Imaging cameras: QHY22

Mounts: AZ-EQ6

Guiding cameras: DIY Cam10

Software: Main Sequence Software SGPro  ·  Pixinsight

Filters: Astrodon 5nm Ha 1.25

Accessory: DIY Focus controllers

Dates:June 30, 2020

Astrodon 3nm OIII 1.25: 20x900" bin 1x1
Astrodon 5nm Ha 1.25: 90x900" bin 1x1

Integration: 27.5 hours

Avg. Moon age: 9.72 days

Avg. Moon phase: 73.87%

Astrometry.net job: 4275382

RA center: 20h 12' 13"

DEC center: +38° 11' 8"

Pixel scale: 6.973 arcsec/pixel

Orientation: 4.836 degrees

Field radius: 3.313 degrees

Resolution: 2100x2700

Data source: Own remote observatory

Remote source: Non-commercial independent facility


The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

Sh2-104 can be found in bottom left corner, it also cataloged as DWB 14, is about 14,000 light years away toward the Cygnus constellation. This is located due east of the popular Crescent Nebula. Sh-104 is viewed by professional astronomers as a good illustration of the "collect and collapse" model of star formation triggered by the rapid expansion of a HII.

At the bottom of image there is blue arc related to the nebula associated with WR134 star. WR 134 is a variable Wolf-Rayet star located around 6,000 light years away from Earth in the constellation of Cygnus, surrounded by a faint bubble nebula blown by the intense radiation and fast wind from the star. It is five times the radius of the sun, but due to a temperature over 63,000 K it is 400,000 times as luminous as the Sun.



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    NGC6888 widefield HOO, 


    NGC6888 widefield HOO, 




Description: Starless version

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NGC6888 widefield HOO,