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Crescent Nebula NGC 6888 and Soap Bubble PN Ju 1



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA,  3, 7, and 15 July 2021,  Camera: ASI1600M (Astronomik Gen 2  RGB,  Ha, OIII Filters)

Exposure:  45 x 6 min (1x1 bin, gain - 220) Ha filter,   45 x 8 min (1x1 bin, gain - 220) OIII  filter,   20 x 2 min (1x1 bin, gain - 100) each RGB filters.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration and registration - PixInsight. Sub-frame integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise of channel integrations - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity images - starnet++.  Starless color mapping (modified HOO mapping) and RGB stars color - PixInsight. Stars and Starless combine - PixInsight. Final finishing  - Affinity Photo.  RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad), and Affinity Photo. This image is a  modified HOO narrow band mapping with RGB stars.  Images processed at 4656x3520 resolution. Final highest resolution image size is approximately  3000x2250.

North is up in this image.  This is an image of NGC 6888 (LBN 230, DWB 19, Sh2-105) popularly known as the Crescent Nebula and the recently discovered planetary nebula PN Ju 1 (PNG 075.5+01.7) popularly known as the Soap Bubble Nebula. There are a few notable open clusters  / suspected open clusters - IC 4996 (MWSC 3297) and Kronberger 72 (MWSC 3283).  There are also are dark nebulae -  Dobashi 3210, 3211, and 3215. And finally, there are emission regions LBN 206 and DWB 20. Star cluster IC 4996 is about 6,600 light years distant; NGC 6888 is about 6,700 light years distant.  These objects and some of the brighter stars are seen in the annotated image.  The Horizontal FOV is approximately 84'. Image scale of the full size image is 1.67 arcsec/pix. 

Image center is located approximately - Equatorial 2000: RA: 20h 14m 03s Dec: +3803'01" 


All images and content remain the property of Jim Thommes - copyright 2003 - 2021

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