NGC6888 widefield HOO (Sergiy_Vakulenko)

Celestial 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 · Cygnus · IC 4996 · NGC 6871 · NGC 6881 · NGC 6883 · NGC 6888 · 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 · Sh2-104 · Sh2-105 · Sh2-108 · The star 27Cyg · And 6 more.

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NGC6888 widefield HOO

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NGC6888 widefield HOO

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.

Final
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Description: Starless version

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Sharpless2 Objects
Sony 694 Images
Narrowband imaging

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
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Deep sky
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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	4275382
PixInsight job	6MR8SWFKJ16L8I2YV3JEG27T38Y1UABY
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m13s.22
RA (top/left)	20h24m01s.81
RA (top/right)	20h02m41s.10
RA (bottom/right)	20h01m10s.79
RA (bottom/left)	20h21m04s.74

Dec (center)	+38°11′08″.9
Dec (top/left)	+40°34′40″.1
Dec (top/right)	+40°55′57″.5
Dec (bottom/right)	+35°43′29″.4
Dec (bottom/left)	+35°23′29″.10

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NGC6888 widefield HOO

NGC6888 widefield HOO

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NGC6888 widefield HOO

NGC6888 widefield HOO

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