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Old 20-11-2011, 01:43 PM
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mldee (Mike)
Gadget freak

mldee is offline
 
Join Date: Aug 2008
Location: Near Warwick, Qld, Australia
Posts: 513
QHY9 bad pixels

I get the same thing, only I have a lot more hot pixels, to the point where I'm almost ready to ask Theo if it's normal to have so many. I made a bad pixel map in Neb2 last night that seems pretty good, I'll attach it.

As I want to make some reliable Darks and Flats now, I also did the Test as described in http://www.cool.id.au/astronomy/Neb_tut/ by Benko and Felix, which I think is also here on IIS if you do a search. My results were good apart from the unexplained drop in mean from ~64000 to 32742 at saturation (Gain 10). Any comments on this are welcome.

Anyway, my final settings appear to be G9, Offset 115, and they seemed to work OK last night, although still lots of hot pixels in my normal 5 minute exposures.

I was hoping to do a new set of bias, darks then flats at this setting this afternoon, but it's 42C in the obs and the poor old QHY9 will only hit -14C at the moment.

Hope this may assist the OP.
Attached Thumbnails
Click for full-size image (Bad Pixel map Q9 5min  -20c G9 O115.jpg)
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Attached Files
File Type: pdf QHY9 Gain and offset test 111120.pdf (4.2 KB, 6 views)
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