The Crescent Nebula NGC 6888 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.
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”.
NGC 6888, Crescent nebula
The Crescent Nebula NGC 6888 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.
Photographed with APO107 refractor telescope and Atik 360EX monochrome CCD camera in Åva, September 2019. Total exposure time was 57 minutes.
NGC 6888, Crescent nebula
The Crescent Nebula NGC 6888 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.
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”.
Photographed with APO107 refractor telescope and ASI 2600MC color camera in Stuvsta, November 2021. Exposure was 18*4min with IDAS NB1 narrowband filter and then post-processing in Pixinsight.
NGC 6888, Crescent nebula
The Crescent Nebula NGC 6888 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.
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”.
Photographed with APO107 refractor telescope and ASI 2600MC color camera in Stuvsta, November 2021. Exposure was 18*4min with IDAS NB1 narrowband filter and then post-processing in Pixinsight.
NGC 6888, Crescent nebula
The Crescent Nebula NGC 6888 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.
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”.
Photographed with APO107 refractor telescope and ASI 2600MC color camera in Stuvsta, November 2021. Exposure was 30*4min with L-extreme narrowband filter and then post-processing in Pixinsight.
NGC 6888, Crescent Nebula
Photographed with the APO 94 mm refractor telescope and ASI 2600MC CMOS color camera in Åva, November 7th 2024. Exposure was 20 * 3 min with IDAS LPS D2 light pollution filter. Postprocessing in Pixinsight.
NGC 6888, Crescent Nebula
Photographed with the APO 94 mm refractor telescope and ASI 2600MC CMOS color camera in Åva, November 7th 2024. Exposure was 20 * 3 min with IDAS LPS D2 light pollution filter. Postprocessing in Pixinsight.