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Glare from Deneb?

astrophotography beginner imaging
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#1 aliljenb

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Posted 02 August 2020 - 08:08 AM

Hi all,

 

This is my first attempt on photographing an emission nebula.

 

Please have a look at the artefacts in the top right corner, the lines and kind of rainbow like.

First I thought there was something wrong with my equipment, but I can't figure out what.

I've never seen it on any other image I've taken.

 

Now I suspect it could be light glare from the bright nearby star Deneb.

Could that be the case?

 

Some additional info:

 

Target: Pelican Nebula

Camera: Zwo ASI 294 MC Pro

Filter: Optolong L-Pro 2"

11 x 600 secs exposures

25 x 5 secs flats

25 darks

25 dark flats

 

Cheers,

// Åke

Attached Thumbnails

  • PelicanNebula-2a.jpg


#2 ChrisWhite

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Posted 02 August 2020 - 08:43 AM

Is it possible that Deneb is within the field of view of your telescope but not your sensor?  If so, would a longer dew shield prevent this?  Or a slight recomposition.


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#3 AstroBrett

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Posted 02 August 2020 - 08:53 AM

It is glare from a bright object just outside the field of view. You commonly see this on images of the Flame and Horsehead nebulae from nearby Alnitak. If you note the lines are radial and converge, so you can confirm the source using an atlas to find the converging point, which I would be sure is Deneb as you suggest.

 

Brett


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#4 aliljenb

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Posted 02 August 2020 - 09:44 AM

Thank for your responses! Now I'm pretty confident it's Deneb.

Just as Brett points out, the lines converge right to it.

 

Next time I'll try to recompose the image somewhat.

But it's a bit hard to notice these things when you're out there in the middle of the night...

 

Cheers,

// Åke




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