I reprocessed this image since weather doesn't support imaging up here and my processing work flow is somehow different now. My new work flow produces much softer images, I think.
The "Pelican Nebula"
Ra 20h 50m 48s Dec +44° 20′ 60"
Sh2-142 alias NGC 7380, in mapped colors, from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen.
A closeup
Info
The Pelican Nebula (also known as IC5070 and IC5067) is an Hydrogen emission region associated with the North America Nebula in the constellation Cygnus. The nebula resembles a pelican in shape, hence the name. The Pelican Nebula is , close to Deneb, and divided from its brighter, larger neighbor, the North America Nebula, by a molecular cloud filled with dark dust. Distance is about 1800 light years
Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
Orientation
The area of interest is marked with a white rectangle. This image shows a large portion of constellation Cygnus, North America Nebula, NGC 7000 at right and Pelican Nebula at left. This image is a small part of very large mosaic image of the Cygnus.
Image showing a light emitted by the ionized Hydrogen, H-alpha
A H-alpha channel alone
Technical details
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.
Camera QHY9,
Optics Meade LX200 GPS 12" forced to @ f4.65
Guiding with SXV-AO active optics unit 11Hz
Filters
Baader H-alpha 7nm, 6h, 20 min subs
Baader O-III 8,5nm 1h, 10 min. subs binned 3x3
S-II 1,40h, 10 min subs binned 3x3
Original processing can be seen here:
Ps.
A study about an apparent size in the sky
More info in here:
The size of the Moon (0.5 degrees) is marked at first image in the series.
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