This is a bicolor image of the Eastern Veil Nebula using Ha (red) and OIII (blue) narrow band. This was one of my first attempts at a pure narrow band image from a mono camera. Sill working on how to control color, especially in the stars.
What is this? (answer borrowed from Wikipedia)
The Veil nebula is a supernova remnant (SNR) which is the structure resulting from the explosion of a star in a supernova. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way.[
Supernova remnant - Wikipedia] The source supernova was a star 20 times more massive than the Sun which exploded between 10,000 and 20,000 years ago. The remnants have since expanded to cover an area of the sky roughly 3 degrees in diameter (about 6 times the diameter, and 36 times the area, of the full Moon).
This image is only a small part of the full Veil nebula.
When finely resolved, some parts of the nebula appear to be rope-like filaments. The standard explanation is that the shock waves are so thin, less than one part in 50,000 of the radius,=10.5px that the shell is visible only when viewed exactly edge-on, giving the shell the appearance of a filament. At the estimated distance of 2400 light-years, the nebula has a radius of 65 light-years (a diameter of 130 light-years). The thickness of each filament is 1⁄50,000th of the radius, or about 4 billion miles, roughly the distance from Earth to Pluto. Undulations in the surface of the shell lead to multiple filamentary images, which appear to be intertwined. [cite
Veil Nebula - Wikipedia]
Celestron 9.25 SCT with hyperstar V4 (FL 525 mm, f/2)
Camera: ASI2600mm, 200 gain, -10°C
Filters: Astronomik MaxFR 6 nm Ha, 12 nm OIII
Ha: 25 x 300 s
OIII: 25 x 300 s
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