July 2023 - just played around with the below image to improve it once again!
Above - Soap Bubble & Crescent - Reprocessed in 2020 - without the RGB. (Click on image for higher resolution)
A closer look at the Crescent Nebula
Below is from 2018.....above is from 2020 - same data
NGC 6888 & PN G75.5+1.7 as processed in 2018. (Includes the RGB data)
The Crescent Nebula - upper right (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. 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".
The very faint Soap Bubble Nebula - lower left, or PN G75.5+1.7, is a planetary nebula in the constellation Cygnus, near the Crescent Nebula (NGC 6888). It was discovered by amateur astronomer Dave Jurasevich using an Astro-Physics 160 mm refractor telescope who imaged the nebula on June 19, 2007 and on July 6, 2008. The nebula was later independently noted and reported to the International Astronomical Union by Keith. B. Quattrocchi and Mel Helm who imaged PN G75.5+1.7 on July 17, 2008
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: PHD 2, Pleiades Astrophoto PixInsight , Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha (3nm), Astrodon OIII (3nm) & Astrodon RGB
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 4961 x 3309
Dates: 17th Jul to 23rd Jul. '18
Frames:
Astrodon Ha 24 x 20'
Astrodon OIII 33 x 20'
RGB 18 x 10'
Total Time: 22 Hours.
Center (RA, Dec):(303.391, 38.237)
Center (RA, hms):20h 13m 33.884s
Center (Dec, dms):+38° 14' 13.744"
Size:59.3 x 39.6 arcmin
Radius:0.594 deg
Pixel scale:0.718 arcsec/pixel
Orientation:Up is 356 degrees E of N
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".
The very faint Soap Bubble Nebula - lower left, or PN G75.5+1.7, is a planetary nebula in the constellation Cygnus, near the Crescent Nebula (NGC 6888). It was discovered by amateur astronomer Dave Jurasevich using an Astro-Physics 160 mm refractor telescope who imaged the nebula on June 19, 2007 and on July 6, 2008. The nebula was later independently noted and reported to the International Astronomical Union by Keith. B. Quattrocchi and Mel Helm who imaged PN G75.5+1.7 on July 17, 2008
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: PHD 2, Pleiades Astrophoto PixInsight , Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha (3nm), Astrodon OIII (3nm) & Astrodon RGB
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 4961 x 3309
Dates: 17th Jul to 23rd Jul. '18
Frames:
Astrodon Ha 24 x 20'
Astrodon OIII 33 x 20'
RGB 18 x 10'
Total Time: 22 Hours.
Center (RA, Dec):(303.391, 38.237)
Center (RA, hms):20h 13m 33.884s
Center (Dec, dms):+38° 14' 13.744"
Size:59.3 x 39.6 arcmin
Radius:0.594 deg
Pixel scale:0.718 arcsec/pixel
Orientation:Up is 356 degrees E of N
Close-up....The Soap Bubble is the earlier version - with RGB data included in the processing .
Sky Map
Annotated Image
