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Michael A. Stecker
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DWB 111 & 119 (Propeller Nebula)
From the Dickel-Wendker-Bieritz Catalog of HII regions of the Cygnus-X star forming region is DWB 111/119, also known as Simeis 57 or the "Propeller Nebula". It is visually close to both stars Deneb and Gamma Cygni in the constellation Cygnus. It has the red Hydrogen-alpha color of an emission nebula. file: DWB111-240sX52P2AP130f6-7272023a2.jpg Photographic Data telescope: Astro-Physics 130 mm EDF Starfire refractor at f/6.7 (focal length= 877 mm)
mount:
ZWO AM5 harmonic/strainwave Mount Guide Settings in Asiair Plus: Calibrate Step: 5,000 ms Dec Duration: 3,000 ms RA Duration: 2,000 ms Aggression: 50% for both RA & Dec Exposure time for guiding: 1 second
Guiding hardware:
SVBony 60 mm f/4 guidescope (fl=240 mm) Guide Camera: ZWO ASI662MC color planetary camera (2.97 micron pixels) controller/computer ZWO Asiair Plus via WiFi to Samsung S7+ tablet . imaging camera: ZWO ASI533MC-Pro one-shot color astro-camera cooled to 14-degrees F with Optolong L-eNhanced nebular filter . exposures: 240 seconds X 52 (208-minutes or 3.4 hours)
processing
Stacked in Asiair Plus and cropped and post-processed in Adobe Photoshop Elements . photographic site: West Los Angeles http://mstecker.com/pages/chhouses_fp.htm (Bortle 9 light polluted sky) |
 from: https://www.cloudynights.com/articles/cat/column/phil-harrington-s/cosmic-challenge-emission-nebula-simeis-57-r3201 and https://cosgrovescosmos.com/projects/dwb111-119-the-propeller-nebula |
