Hello,
I need some advice on addressing imaging artefacts in some recent M16 data that I grabbed whilst waiting for Neptune to climb out of the murky lights of Brisbane, using the C9.25 F10 with x0.63 Reducer/Corrector and Gerald’s ST2000/CFW10 combo.
When I came to process the LRGB frames in CCDStack I noticed what appeared to be “holes” in the data and these appeared at the same position in each frame so a Median combine couldn’t get rid of them. CCDStack reports them at around 6000-7000 ADU with the surrounding background starting at around 7,000 ADU.
I tried applying the “Hot/Cold Pixel” function in CCDStack and this failed to remove them. Other data rejections techniques in CCDStack look as if they remove good data in the frame when I try to “kill” these holes.
I’ve attached an x2 enlargement from the combined 12x5min Lum frames to show these “holes”.
I’d appreciate any advice on how to target these holes as I have 9x20 min sub frames revealing Nereid’s motion (moon of Neptune) and they are also peppered with these holes. Thanks!
Cheers
Dennis