Sh2-112 - Ha RGB

Hi Folks,
Below is a link to an image I made of Sh2-112. Attention in Cygnus is sometimes dominated by the North American Nebula and the Pelican. I picked this up and Sh2-115 in the vicinity earlier this month (Sh2-115 to come later.)

Full size image and processing / exposure data are at:

http://jthommes.com/Astro/SH2-112.htm

This is an Ha RGB image with a C8 at f/3.7 and my Artemis285

Beautiful shot Jim, quite an interesting object... 8)
Thank you for sharing these "not so popular" objects with us,

hi Jim,

very nice result!
your setup works beautifully obviously!

Nicely done Jim!

Tom

Jim, well done!

From your web site I see you have an assortment of focal reducers and spacers, which did you use for this image? I'm not too happy with the results that the Meade f/3.3 gives with my C8 but this image is very nice.

Eric

Thanks all for the comments...

Eric,
Using focal reducers on the C8 is always a bit iffy. In this case I used the Meade 0.33x reducer. I had it spaced from the CCD about 48 mm. For the rated reduction, I think the optimum is 58 mm. It is somewhat forgiving for shorter distances if your imaging set up back focus is short. In fact, it can perform relatively well. Beyond the 58 mm reducer spacing and edge quality deteriorates rapidly.

My chip is 11 mm in diagonal - much bigger and the Meade 0.33x reducer begins to loose it. So small chip size and be sure you don't go over 58 mm and some results can be achieved. Looking closely at the image though, you can see the optics imperfections impacting the edge of the frame.

Looking good Jim!



Jason

Nice one, Jim! Isn't this called the Nautilus nebula sometimes for its resemblance to the marine creature?

Eric

Jason, Eric,
Thanks for the comments.

Eric,
Nautilus Nebula, huh. I wasn't aware of a common name as such. I did a quick Google on Nautilus Nebula and came up with a planetary - NGC 6210. But now that you mention it, it does have a resemblance. How do we petition the Astronomical Union for an Object Common Name?

That is a really nice image Jim! I may need to add this object to my "must do someday" list.
Cheers,
Tyler