G82.2+5.3 Cygnus Shell

Click on the image for high res version. MOUSE OVER for RGB-Ha-OIII starless. Look also to the OIII starless hires and H-alpha starless hires.

This supernova remnant is one on the faintest subject I've ever imaged. Named G82.2+5.3 from the galactic coordinates of the ellipse center, named also Cygnys Shell or W63. The position in the sky is 4° West of Deneb. The elliptical remnant is only in part visible in this image, with the faintest region outside the lower edge. The remnant is visible only in OIII light, while it is immersed in a bright H-alpha emission nebulae region and a very dense region of Milky Way filled with stars.
The narrowband imaging is fundamental to show the supernova remnant, and even more visibility is obtained by digitally removing the stars (look at the mouse over starless bicolor and the OIII and Ha only starless). Thanks to Nikita Misiura for his software StarNet++.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time Total 14 h 50 min, composed of OIII-Ha-RGB  480:270:50:50:40 min (single exp of 30 min for OIII and Ha, and 10 min for RGB)
CCD SBIG STL-11000M @-30°C
Location Colle dell'Agnello, Rifugio degli Alpini Mario Bottero (CN, Italian Alps) at 2700 m height
25-26-28-29-30 August 2019 (5 nights)
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= (+10 to +5) °C, RH=(86 to 100) %
Sky brightness at zenith (with SQM-L) (21.5 to 21.7) mag/arcsec^2
Notes Impressively humid nights, with many local clouds that ruined part of all the nights, but very dark.

HTML Editing and Publishing by Lorenzo Comolli. Email me at comolli@libero.it.
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