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When in doubt, go bigger than you think—undersized art is the most common mistake. The print should fill about â…” the width of the furniture beneath it.
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The Cygnus Loop (collectively catalogued as Sharpless 103, i.e., Sh2-103) is a large supernova remnant (SNR) in the constellation Cygnus, an emission nebula measuring nearly 3° across. Radio, infrared, and X-ray images reveal the complete loop.
The visual portion of the Cygnus Loop is known as the Veil Nebula, also called the Cirrus Nebula or the Filamentary Nebula. Several components have separate names and identifiers, including the "Western Veil" (on the right side, NGC 6960) or "Witch's Broom", the "Eastern Veil" (on the left side, NGC 6995), and Pickering's Triangle (between the two 'veils.').
The Cygnus Loop supernova remnant is about 2.670 light-years from Earth, is approximately 120 light-years in diameter, and is estimated to be 20,000 years old.
I chose to render the photograph of the Cygnus Loop supernova remnant using HOO color palette. See below in the Full Description section for an explanation of HOO color palette.
This photograph is a two-panel mosaic I captured over three weeks. Each panel took three nights, and about 90 images were stacked per panel. I was able to capture this in my Bortle 8 urban skies in my backyard in Phoenix, Arizona.
The majority of photographs of nebula are in a false color palette. False-color photographs of nebulae are essentially color (RGB) photographs whose color channels have been mapped to specific emission lines. In these images, each color can represent a specific element. In other words, a false-color image of a nebula tells us exactly what it’s made of. There are many emission lines, but the three most photographed by astronomers are hydrogen-alpha, oxygen-III and sulfur-II. These emission lines are captured by using narrowband filters which only let through the light at very specific wavelengths, typically most of my photographs are taken with filters allowing a bandwidth of 3µm.
|
Element |
Emission line |
Wavelength |
Color |
|
Hydrogen |
Hα |
656.3 nm |
Red |
|
Oxygen |
O-III |
500.7 nm |
Blue/Green |
|
Sulfur |
S-II |
672.4 nm |
Red |
Mapping Hα, O-III and S-II to red, green and blue is problematic when two of them are red, one is blue/green, and none is pure blue. Astronomers deal with this by using false color — one or more of these elements will have to take a hit for the team and take on an unnatural hue. The HOO color palette assigns red to Hα, green and blue to O-III: red is accurate, and green and blue are false. Sometimes, some astrophotogers add some Hα to the O-III in the green channel for a synthetic green. The point of this color palette is to emphasize specific nebula structures so that they are more prominent. This photograph uses the HOO color palette, hence the reds and blues you find in the photograph.
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About Dave
I create landscape photography for contemporary interiors where visual quality matters. My focus is dramatic environments—deserts, coastlines, forests, ancient architecture, night skies—photographed with deliberate composition and attention to craft. I'm selective about what I show. This collection represents a small percentage of what I shoot—work chosen for compositional strength and the ability to reward sustained viewing. These are images designed to live on your walls for years, not months.
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This means you can use the camera on your phone or tablet and superimpose any piece of art onto a wall inside of your home or business.
To use this feature, Just look for the "Live Preview AR" button when viewing any piece of art on this website!
This means you can use the camera on your phone or tablet and superimpose any piece of art onto a wall inside of your home or business.
To use this feature, Just look for the "Live Preview AR" button when viewing any piece of art on this website!
