Strange Streaks In ...
 
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Strange Streaks In Image

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(@greenj23)
Molecular Cloud
Joined: 3 years ago
Posts: 2
Topic starter  

Forgive the dumb question as I'm just starting out. Any idea what these streaks might be?

 

Using:

WO Z61

ASI294MC Pro

EQ6-r Mount

Optolong L-Pro filter

ASI 120mm Mini Guide cam

Streaks

 


   
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(@wvreeven)
Quasar
Joined: 5 years ago
Posts: 2121
 

@greenj23 It is hard to say without more information but it looks like walking noise to me. Did you drizzle in between exposures?

Walking noise arises when there is a slight shift of the FOV in between exposures such that instrument noise gets slowly shifted with respect to the target. It is hard to impossible to remove during processing and post-processing. The only remedy against it is to sufficiently drizzle in between images so the noise gets spread in a random and large enough way so it can be processed out.


   
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(@greenj23)
Molecular Cloud
Joined: 3 years ago
Posts: 2
Topic starter  

@wvreeven Thanks! I'm using the AsiaIR Pro to capture. I don't it has a drizzle option and this is the first time ive seen this issue. I used DSS to stack. I guess i'll see if this issue happens again next time I get a clear night.


   
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(@astrogee)
Neutron Star
Joined: 5 years ago
Posts: 147
 
Posted by: @greenj23

@wvreeven Thanks! I'm using the AsiaIR Pro to capture. I don't it has a drizzle option and this is the first time ive seen this issue. I used DSS to stack. I guess i'll see if this issue happens again next time I get a clear night.

I think Wouter meant to say dither rather than drizzle - you need to dither to drizzle however. Anyway, the walking noise is due to good guiding while having flex between the guide scope and main scope. I've heard that very good calibration can get rid of it but I haven't seen that in practice. Dither is the way to go. "Dither or die" they say.


   
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(@wvreeven)
Quasar
Joined: 5 years ago
Posts: 2121
 
Posted by: @astrogee
Posted by: @greenj23

@wvreeven Thanks! I'm using the AsiaIR Pro to capture. I don't it has a drizzle option and this is the first time ive seen this issue. I used DSS to stack. I guess i'll see if this issue happens again next time I get a clear night.

I think Wouter meant to say dither rather than drizzle - you need to dither to drizzle however. Anyway, the walking noise is due to good guiding while having flex between the guide scope and main scope. I've heard that very good calibration can get rid of it but I haven't seen that in practice. Dither is the way to go. "Dither or die" they say.

Oops, yes I meant dither instead of drizzle. Thanks for the correction!


   
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