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NGC 7662 – The Blue Snowball in Andromeda – ZWO ASI294MC Pro @ f/10

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#1 jgraham

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Posted 18 August 2019 - 10:58 AM

Telescope: 10” Meade LX80 at f/10, Orion Atlas EQ-G
Camera: ZWO ASI294MC Pro, -10C; Gain: 200
Filter: Orion Imaging Skyglow Filter
Guide scope: ETX-60, Meade DSI Pro III, PHD
Exposure: 79x60sec saved as FITS
Darks: 32x60sec saved as FITS
Flats: 32x30sec, LED tracing tablet covered with 3 layers of muslin
Average Light Pollution: Red zone, fair transparency
Lensed Sky Quality Meter: 18.7 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop

 

NGC 7662 (8-2-2019)-1j.jpg

 

NGC 7662 is a remarkable little planetary nebula in Andromeda. Visually, it appears as a beautiful blue spot, easily visible even in my little ETX-60 as an out of focus star. Photographically, it shows a sharply defined shell with a ring circling the central star. The shell also shows hints of fine detail. The central star is rather unusual for a planetary in that it is a variable star that ranges from Mv 12 to 16.

 


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#2 stargazer60

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Posted 18 August 2019 - 11:14 AM

Very nice image, it is nice to know that even with a small scope the wonders of DSO's aren't waisted.  Keep up the great work !  I look forward to seeing more of your images. bow.gif waytogo.gif 



#3 astroian

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Posted 18 August 2019 - 11:45 AM

Nice image of the central region of NGC 7662. If you’re willing to spend lots of time on this object then it has a quite extensive halo.

Cheers, Ian

#4 jgraham

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Posted 18 August 2019 - 07:30 PM

Thanks! I've caught whispers of the outer halo before, but my skyglow makes it quite a challenge. I'll have to give it a try with my Triad Ultra filter, I've had excellent results with this filter so far.

 

So much to see, so few clear nights...

 

:)



#5 jdupton

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Posted 18 August 2019 - 08:42 PM

John,

 

   A portion of the halo is there in your image. A little more processing and I'd bet you can pull some of it out. It shows up if I download the JPG and give it a bit more stretch. Of course that blows out the highlights in the planetary itself but if you are working with the original 16/32 bit data, I'll bet you can tease some of that halo into visibility.

 

 

John

 

PS: This is one of my main faults with astrophotography. I try to pull out every single electron I can in the faint areas of my images. It is often to the overall detriment of the image but I feel I have to see just how far I can go with any given amount of data I have when processing.


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#6 jgraham

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Posted 18 August 2019 - 09:29 PM

Coolness! I'll take a closer look at the source data when I get a chance. I try to go easy on the processing, but it is fun to take a deep dive to see what is hiding in the data. This was one of two images that I took with this 10" f/10 SCT after using it at f/25 earlier in the evening to image Jupiter.

 

Neat stuff!



#7 jgraham

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Posted 19 August 2019 - 09:09 PM

You are right, there is just a whisper of the outer shell hiding in the data...

 

NGC 7662 (8-2-2019) Halo-1j.jpg

 

...I'll have to try this again using the Triad Ultra filter on my SN10 and see what I can get.

 

Neat stuff!

 



#8 Jim Thommes

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Posted 21 August 2019 - 12:53 PM

Nice shot John.




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