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The Horsehead Nebula

The Horsehead Nebula, RGB

January 4th, 2017

Back to the old Horsey again! Much better this time though. This is also my first final image with some new goodies. The Astro Tech 6inch Newtonian is great, but the coma corrector is an interesting case. The left half of the image has no coma, but the right side has horrendous coma. Any advice?

The focus of the image, the horsehead nebula, is a dark cloud of gas and dust absorbing light from behind it and is cataloged as Barnard 33. The red emission nebula behind the horsehead is known as IC 434. The orange emission nebula to the left of the image (under the bright star Alnitak), also known as the flame nebula, is cataloged as NGC 2024. Finally, the blue reflection nebula below the horsehead is cataloged as NGC 2023.
This area is located at the bottom star in Orion’s belt (named Alnitak), and is notoriously hard to capture because of its dimness and the proximity to the magnitude 1.74 Alnitak. This area is part of the Orion Molecular Cloud Complex that includes the Orion Nebula (M42), and the brightest reflection nebula in this part of the sky (M78).

RGB – 3.5hrs, 300s, ISO 400, F/4
Ha – 3.5hrs, 600s, ISO 800, F/4

Astro Tech 6inch Newt
Astro Tech Coma Corrector
Canon T3i (Stock)
Astronomik CLS clip filter
Canon 450D (monochrome)
Astronomik 12nm Ha filter
iOptron ZEQ25gt
Orion SSAG
PS, DSS, Carboni’s Tools, Gradient Xterminator, PHD 2, PS, BYEOS

Thanks for looking!