SH2-170 - Little Rosette Nebula

The Little Rosette Nebula designated as SH2-170 is also known as the Small Rosette Nebula is located approximately 7,500 light-years away in the constellation of Cassiopeia. In its center is a young star cluster named Stock 18 whose brightest star ionizes the hydrogen gas, thus producing the glow. It resembles the larger and more popular winter object The Rosette Nebula in the constellation Monoceros.  I estimated the diameter to be ~45 ly by doing a trigonometric calculation assuming the angular distance of 0.36 degrees (2/3 lunar diameter) and a distance of 7,500 ly.  For comparison the Rosette Nebula is 130 ly across and 5,000 ly away.

I would have liked to get more data but the weather has not been cooperating at all. This is a good object to use the dual band IDAS NBZ filter since it has lots of hydrogen and a bit of oxygen. I separated the RGB and made 'synthetic' Ha and OIII channels and then recombined it as an HOO image. I also did a bunch other stuff including synthetic luminosity layers and Starnet++. Overall I am happy with the outcome.

This is my last image for a while with the 0.7 focal reducer as I plan to test the hyperstar next.  In fact this may be last image for a while period as summer recess is over.  I did manage to solve the issue I was having with stacking in PixInsight, it seems it was my flats after all. This image and my previous image with the setup of SH2-136 - The Ghost Nebula stacked perfectly with PixInsight using my new flats.

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SH2-170 - Little Rosette Nebula

Dates: 8-15, 8-16

Camera: ZWO ASI294MC-Pro
Telescope: Celestron EdgeHD 800
Barlow: None
Focal Length: 2032mm (native)
F/10 (native)
Focal Reducer: Celestron .7 Reducer Lens
Mount: Orion Atlas Pro
Filter Adaptor: ZWO Filter Drawer
Filter: Baader IDAS NBZ (2-inch)
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Orion ST80
Exposure: NBZ 90 x 180
Gain: 120
Offset 0
Temp: 0 C
Processing: Asiair app, PixInsight, Photoshop, Topaz DeNoiseAI.

https://www.instagram.com/astroquest1/
http://astroquest1.blogspot.com/
https://www.astrobin.com/users/kurtzepp/collections/
http://youtube.com/c/AstroQuest1