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I agreeImaging telescopes or lenses: Customized Newton320/4.5
Imaging cameras: Atik 383L+ Mono
Mounts: WS-180
Guiding telescopes or lenses: Customized Newton320/4.5
Focal reducers: ASA 3" Wynne Corrector 0.95x
Software: Pleiades Astrophoto PixInshight · CCDCommander · FitStacker
Filters: Baader Planetarium LRGB 36 mm, Ha (7 nm), OIII (8,5 nm), SII (8 nm)
Dates:April 13, 2020 , May 24, 2020 , June 28, 2020 , July 2, 2020 , July 14, 2020
Frames:
Baader B 36mm: 80x120" bin 1x1
Baader G 36mm: 51x120" bin 1x1
Baader Ha 36mm 7nm: 85x1200" bin 1x1
Baader OIII 8.5nm 36mm: 48x1200" bin 1x1
Baader R 36mm: 50x120" bin 1x1
Integration: 50.4 hours
Avg. Moon age: 13.07 days
Avg. Moon phase: 49.35%
Astrometry.net job: 3905336
RA center: 18h 53' 35"
DEC center: +33° 1' 40"
Pixel scale: 0.407 arcsec/pixel
Orientation: 178.235 degrees
Field radius: 0.121 degrees
Resolution: 1700x1300
Locations: Astromania Vedrus remote observatory, Krasnodar, Russian Federation
Data source: Amateur hosting facility
Remote source: Astro Hostel Krasnodar
М 57 envelope
M57 halo ("envelope") is considered to be outer layers of the host star blown away by stellar wind during asymptotic giant branch phase just before nebula itself was born.
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The nebula image is Ha-OIII-OIII composition (200% crop of central part). Stars were overlaid from RGB image.
Due to high dynamic range, some processing tweaks were used. First, two separate integrations per filter were made: best of the best based on FWHM criteria for the brightest nebula part and a full set of images for maximizing SNR in shadows. Than stretch of various degree was applied. And they all were combined later into artificial HDR.
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[1] Nebula 3D model image was taken from "Studies of NGC 6720 with Calibrated HST WFC3 Emission-Line Filter Images–I: Structure and Evolution", C. R. O’Dell, G. J. Ferland, W. J. Henney and M. Peimbert, 2013
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Full frame:
Description: Nebula 3D model [1]
Description: Full frame
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