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Old 14-October-2009, 10:41 AM
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Default NGC7635 - Bubble Nebula in HST palette

Hi
I finished this over two nights thanks to some clear skies although the second night was plagued by some high thin mist. I had to reproces this a couple of times as the stars were overwhelming the nebula due to halos and brightness but I think I have managed to reach a compromise. As the SII signal was much weaker than the Ha I had to push it harder hence the 'colourful stars' but this is a known issue with the HST palette with weak SII.
It was taken with the Takahashi BRC-250, Starlight Xpress H9 on a Paramount ME with autoguiding taken care of by a Starlight Xpress Lodestar on a TMB 115 using dithering in Maxim DL, there are 21x10 minutes for each channel. Simple auto dark subtraction was done in Maxim DL, no flats or bias frames were used. I did a widefield image of this last year using the TMB115 and H36 camera and this can be seen on Nebulae section of the image gallery on my website http://www.imagingtheheavens.co.uk for comparison. Although it is still far from perfect with the halo problems I am quite happy with the results
Thanks for looking
Best wishes
Gordon

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Old 14-October-2009, 12:49 PM
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That's cool.

With the star colour problems you mentioned, it looks like the Hello Kitty version.
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