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Sh2-115 and 116 HOO



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 15 July and 1 August 2021,  Camera: ASI294MM (Baader Ha, RGB, ZWO OIII filters)

Exposure: Exposure: Ha - 32 x 6 min (gain-220 2x2), OIII - 32 x 8 min (gain-220 2x2) ,  RGB -20 x 3.5 min (gain-121 2x2) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity Ha and OIII images for later processing - Star XTerminator. Curves, Levels, stars RGB combine, stars Luminance layering - PixInsight. Color Stars and Starless  combine - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  Bicolor narrow band image (modified HOO) with RGB stars.  Image processed at 4144x2822 resolution. Final Image size is approximately  3200x2164.

North is up in this image.  This image shows the emission nebula Sh2-115 (also known as LBN 357) and  the planetary nebula Sh2-116 (also known as DWB 118 and  Abell 71).  This image field is in the Cygnus -X region which is the area of the DWB catalog. This image contains ten objects of the DWB catalog. This image field also contains four LBN objects (the afore mentioned LBN 377, LBN 352, 358, and 362). The open cluster Berkeley 90 is also in this image field. One of the members of Berkeley 90 (TYC 3573-1489-1) is the ionizing star of Sh2-115 - it is estimated to be about 9630 light years distant (by paralax). So Sh2-115 is in this range for distance.  These objects and some of the brighter stars are identified in the annotated imageHorizontal FOV is approximately 120 arc minutes. Full size image scale is 2.25 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 20h 32m 50s Dec: +4652'56"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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