Ballard wrote:
The images below are of NGC 891 nicknamed the Outer Limits Galaxy since it was one of the Galaxies that was shown in the end credits of the 1960's show called "The Outer Limits" (It was one of my favorite shows back then).
NGC 891 is just over 27 million light years away and can be found in the constellation of Andromeda and shines at magnitude 10.84. This edge on spiral galaxy is thought to look like our galaxy from an edge on perspective and is approximately the same size as the Milky Way. On close inspection you can find several much more distant galaxies in the images. However only PGC 9042 at magnitude 16.23 shows up in my charts and can be found towards the top of the image about 1/2 way between the left edge and center of the image. The other many more faint galaxies can be spotted as elongated blobs of light and or are more fuzzy than the images of the stars.
The first image was taken using Luminance, Red Green and Blue filters. The second image added in an Image taken using a 5 nm Narrow band Hydrogren Alpha filter using the NBRGBCombination routine, which rebalances the color after adding in the Ha data (The NB stands for Narrow band, the RGB stands for Red, Green and Blue). Note: In the second image the little red areas along the dust line in galaxy that are brought out with the Hydrogen Alpha data (You will probably need to use double down to zoom in enough to see these red areas). These red dots reveal locations of active star formation. In both images the background star brightness was reduced to not distract from the image of the Galaxy.
All questions comments and suggestions are welcome.
For those interested
All images were taken using a 16" Schmidt Cassegrain telescope at a 4064mm focal length (F10). The camera used was a monochromatic ASI 6200MM pro cooled camera. The camera images were taken a -12 C with a gain of 100, with binning set to 1x1.
Luminance 91 subframes each 180 seconds long
Red 37 subframes each 240 seconds long
Green 42 subframes each 240 seconds long
Blue 37 subframes each 240 seconds long
Ha 66 subframes each 500 seconds long
The images below are of NGC 891 nicknamed the Oute... (
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Wow! That’s amazing! Thanks for sharing the technique you used.