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Saturday, March 13, 2010

Soul Nebula closeup

Nebula in natural color. Narrowband channels are mixed to match visible spectrum. Red=80% H-alpha+20% S-II, Green=O-III and Blue=80% O-III+20% H-alpha to compensate otherwise missing H-beta.

Nebula in HST-palette, Red=S-II, Green=H-a and Blue=O-III

The nebula season is kind of over but up here, 65N, it's still very possible to shoot some nebulae.
The Soul nebula, IC 1848, was in western sky at elevation of 55 degrees when I started imaging, at Nine a clock. I took last images at four in a morning, at that time the elevation was about 30 degrees and it was just past the Northern moust point at a sky. Evem though I spen whole night shooting this, poor transparency, speeding clouds and, due previous, lost guidestar, I was able to use only Seven 20min. frames for this.
Color for the final image are taken from my older narrowband image from 2008, the original Blog post can be found here:

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.
Broadband data is mixed to a narrowband channels in PS.

Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 10Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 7x1200s, binned 1x1
Note. O-III and S-II are taken from older image of the Soul and Heart nebulae.
Colors are taken from this narrowband, HST-palette, image. Current image is marked with Cyan rectangle.

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