Crescent Nebula in Wide Field (Jim DeLillo)

Crescent Nebula in Wide Field

Revision title: Crescent Nebula Wide Field, intensified

Wide Field
Field of view
324' x 324'

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 was discovered by William Herschel in 1792.[2] 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[3] to 400,000[citation needed] 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.

It is a rather faint object located about 2 degrees SW of Sadr. For most telescopes it requires a UHC or OIII filter to see. Under favorable circumstances a telescope as small as 8 cm (with filter) can see its nebulosity. Larger telescopes (20 cm or more) reveal the crescent or a Euro sign shape which makes some to call it the "Euro sign nebula".

SPECIFICATIONSTelescope..........................................................................................................................................................................................................................
Telescope
SPA-3Camera..........................................................................................................................................................................................................................
Camera
SPA-3Location..........................................................................................................................................................................................................................
Location
SpainDate of observation..........................................................................................................................................................................................................................
Date of observation
22NOV2021Filters..........................................................................................................................................................................................................................
Filters
SHOProcessing..........................................................................................................................................................................................................................
Processing
PixInsight, LightRoom, Topaz DeNoise AI

Original
Final
B

B

Title: Crescent Nebula Wide Field, intensified

Description: Crescent Nebula Wide Field, intensified with additional LightRoom work

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Status	Advanced success
Started	...
Astrometry.net job	5317044
PixInsight job	SQUVJY3C4Z79CQX6VZ8MELCFBF6CE8NB
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m09s.19
RA (top/left)	20h27m02s.28
RA (top/right)	20h24m33s.35
RA (bottom/right)	19h56m17s.42
RA (bottom/left)	20h00m43s.10

Dec (center)	+38°21′40″.1
Dec (top/left)	+35°58′30″.6
Dec (top/right)	+41°20′13″.5
Dec (bottom/right)	+40°37′15″.0
Dec (bottom/left)	+35°18′44″.4

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