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Blue line in all of my subs (ghost, reflection)?

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#1 rdemidio

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Posted 30 November 2023 - 09:09 AM

Howdy Folks, another puzzling one for me as I continue on my journey.  First, here is my rig setup.

 

Telescope: AP130 EDFS f/6
Reducer/Flattener: Tele Vue RAD-1074
Auto Focuser: ZWO EAF
Mount: Celestron CGX
Imaging Camera: ASI2600MC-Pro
Guide Camera: ASI120MM Mini
Guide Scope: Svbony 9x50
Hub: Pegasus Astro

Darks and Flats

 

I have this weird blue line appearing in my horse head nebula subs.  The line is not in any of the subs for other targets.  I imaged M81, Iris Nebula, Rosette in the same session.  I even processed my M81 images to completion and no line is present in the stacked result.  I am including a sub full scale and zoomed in.

 

Something specific to the Horsehead?  Must be something in the imaging train?

 

Thanks,

 

Rich

 

Horsehead_BlueLine.jpg Horsehead_BlueLine_Zoomed.jpg

 



#2 sharkmelley

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Posted 30 November 2023 - 09:16 AM

Almost certainly this is a ghost reflection of Alnitak.  It's very common with a reducer/flattener in the imaging train.  You'll notice that if you re-frame slightly then the reflection will move relative to the star background.


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#3 happylimpet

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Posted 30 November 2023 - 09:36 AM

Satellite trail? Normal sort of declination for geostationary satellites, but the trail looks quite short unless its a very short sub.



#4 Jeroe

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Posted 30 November 2023 - 09:37 AM

Yeah that looks like a lensflare from the bright star. Had some flaring as well when I photographed the horsehead. shouldn't be there with other dso's


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#5 imtl

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Posted 30 November 2023 - 09:50 AM

Something a bit off if you don't mind.

The Tele Vue RAD-1074 is just a nosepiece. Not a reducer nor a flattener. Are you using a flattener at all?

#6 rdemidio

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Posted 30 November 2023 - 10:42 AM

Yes, a 0.8 reducer / flattener.   It is a tv product.    I must  have documented the wrong number.   I can check later on that later 

 

rich



#7 imtl

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Posted 30 November 2023 - 10:47 AM

Yes, a 0.8 reducer / flattener. It is a tv product. I must have documented the wrong number. I can check later on that later

rich


That's not the greatest choice of reducer for your AP scope but if it works it works.


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