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Crescent and Soap Bubble Nebula

Technical card

Imaging telescope or lens: TS-Optics TS 100 Quadruplet

Imaging camera: Atik 460 EXm

Mount: Software Bisque Paramount MX

Guiding camera: Lodestar

Software: PixInsight

Filters: Baader Planetarium OIII 8.5nmBaader Planetarium H-Alpha 7nm

Resolution: 5120x4024

Dates: July 16, 2017July 20, 2017

Frames:
Baader Planetarium H-Alpha 7nm: 30x600" bin 1x1
Baader Planetarium OIII 8.5nm: 30x600" bin 1x1

Integration: 10.0 hours

Avg. Moon age: 23.47 days

Avg. Moon phase: 37.56%

Astrometry.net job: 1683345

RA center: 303.030 degrees

DEC center: 38.361 degrees

Pixel scale: 1.607 arcsec/pixel

Orientation: -93.313 degrees

Field radius: 1.454 degrees

Locations: Observatorio remoto Tomas Lopez en AstroCamp, Nerpio, Albacete, Spain

Description

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 Friedrich Wilhelm 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".

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Author

Samuel
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Crescent and Soap Bubble Nebula, Samuel

In these public groups

Members of AstroCamp in Nerpio, Spain