Crescent Nebula - NGC6888 Ha (Thomas Richter)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888 · Sh2-105

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Crescent Nebula - NGC6888 Ha

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Crescent Nebula - NGC6888 Ha

Object description (wikipedia.org):

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. It was discovered by Friedrich Wilhelm Herschel in 1792. 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.

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".

Final
Original
B

Astrofreunde-Franken

Nebulea

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Status	Advanced success
Started	...
Astrometry.net job	1339657
PixInsight job	QQKYCO91KMRMEID0FIAZDFYQSO7K0PWE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m01s.60
RA (top/left)	20h09m53s.100
RA (top/right)	20h09m50s.70
RA (bottom/right)	20h14m07s.14
RA (bottom/left)	20h14m14s.100

Dec (center)	+38°23′15″.4
Dec (top/left)	+38°57′24″.10
Dec (top/right)	+37°49′48″.6
Dec (bottom/right)	+37°48′57″.5
Dec (bottom/left)	+38°56′30″.4

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Crescent Nebula - NGC6888 Ha

Crescent Nebula - NGC6888 Ha

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Crescent Nebula - NGC6888 Ha

Crescent Nebula - NGC6888 Ha

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