Help whats wrong: n...
 
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2022-05-29: APP 2.0.0-beta2 has been released !

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windows 2.0.0-beta2

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Help whats wrong: noise / guiding error?


(@schakravarthi)
Brown Dwarf Customer
Joined: 1 year ago
Posts: 11
Topic starter  

After a successful attempt at M101 for 2 hrs, I captured almost 7 hours of data. But integrating the 7 hour data is worse than the 2 hour data. Is something wrong with some of the frames - I'm suspecting something wrong with my dark / bias /flats. See the comparison images.

M101 April 30 2022 ( 2hr Integration)
M101 (6. 5 hr Integration)

 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4910
 

That is weird yes, could you post some screenshots of a single sub of your first session and one from your second? As well as a screenshot of you masterdark, masterflat etc?

Also check in the header of the images in your first and second session, if you didn't change any options by accident


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(@schakravarthi)
Brown Dwarf Customer
Joined: 1 year ago
Posts: 11
Topic starter  

@vincent-mod 

First session (2hr)  typical sub is below

image

Second session (6.5 hr) typical sub is below

image

 

First session master flat

image

First session master dark

image

First session master bias is below

image

 

Second session master flat is below

image

 

Second session master dark is below

image

Second session master bias is below

image

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4910
 

Thanks!

It looks a bit like your flat isn't exposed properly and there might be a bit of light leakage in your dark. Normally you want to see a histogram that has a curve that drops quite sharply, but I see an extra bump in yours. I can have a look at your data here if you want as well, but I think there are a few issues in there. What happens if you don't use any calibration frames?


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(@schakravarthi)
Brown Dwarf Customer
Joined: 1 year ago
Posts: 11
Topic starter  

@vincent-mod 

thanks. Redoing without the calibration frames made it better. This is the APP result

image

With some minor denoising, I was able to get this

image

So I am wondering what went wrong with my calibration frames. I am using a Optolong Lpro filter. So what should I expect the different calibration subs / masters look like? 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4910
 

Like I mentioned, you probably want to look at the darks/bias and remake them in a totally dark environment. Like in a bag in a closet or something. Do make them with the same settings as the lights, including temperature if possible. That, in combination with a slightly longer exposed flat, may work better. If not, I can have a look at the new data.


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