NGC7331 Image

I have posted my latest effort in my image gallery, an image of NGC7331, a famous galaxy in Pegasus.  I reproduce the image below.

NGC7331

The data for this image were acquired on August 24 and 27, 2014.  I encountered some difficulties during processing as some of my subs exhibited an unusual red glow that caused bands in the final integrated image.  I am not sure what happened to these subs, but after much trial and error, I found a way to use most of them in my final image thanks to the power of Pixinsight image processing software.  But, I still had to discard 176 of the 800 subs I acquired (each of 10 seconds duration).  Most of these were not suitable due to blurry/elongated stars that result from unguided exposures on a dobsonian mount.  And with the considerable field rotation I experienced during the duration of these exposures, I had to crop most of the field away.  The end result is not up to the standard set by those with equatorial mounts with autoguiding.  But, my humble collection of images demonstrates that it is possible to achieve reasonable results with a dobsonian telescope.

Denis

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Fireworks Galaxy

I am starting to process a backlog of image data, and I have just posted my latest effort, which can be found at the bottom of my images page.  It is an image of NGC6946, the so-called Fireworks Galaxy.  I acquired the image data during July and August of this year, and used Pixinsight to process the data.

I think it is my best result so far.  As I have stated previously, astrophotography with a dobsonian telescope is difficult.  I limit myself to 10 second exposures due to the limitations of my drive system, the lack of guiding capability, and to minimize the effect of field rotation.  In this case I integrated 840 images, which certainly put pressure on my computer!

 

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