NGC 2244 - Rosette Nebula in HO (Rich Sky)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: 12 Mon · 12.49 · 238 Hypatia · NGC 2237 · NGC 2238 · NGC 2239 · NGC 2244 · NGC 2246 · NGC 2252 · Rosette nebula · Sh2-275 · The star 12Mon

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NGC 2244 - Rosette Nebula in HO

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NGC 2244 - Rosette Nebula in HO

This is my first narrowband image using the Baader hydrogen-alpha and oxygen III filters.

I used:

1- Ha data in the luminance channel

2- Ha data in the red channel

3- O-III data in the blue channel

4- Green channel empty

For the green channel, I will get the S-II later.

The green channel was left empty, and at this point I am not sure if oxygen data should go in the green channel.

The learning curve is steep in transitioning from osc to narrowband monochrome image processing. I wish to thank Mr. Uwe Deutermann for his help with this project.

Stacking of mono fits images is very different than osc fits file and I had to figure out a few things with Deep space stacker (DSS). What may not be obvious in DSS, is when you select a reference frame, that reference frame will apply to other groups, in my case the Oxygen III data. I guessed that part, and my Ha and O-III fit files where aligned, except for perhaps 50 pixels at the border.

With mono images, each group (ie. HA, O-III) must be processed separately with the flats acquired for each filters. I stacked, the Ha grey files with darks, ha-flats and bias files. The ha stacked files are saved as the ha-fits. Followed by oxygen data, in DSS, I deselected the Ha lights, and Ha flats, but kept the darks and bias files selected and stacked the oxygen group lights, and oxygen flats to create a Oxygen-III grey stacked file.

If you started your journey with osc, be prepared to have a few learning when going into creating the different grey files for each of the channels, luminance-red-green and blue.

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Canadian Astrophotography

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Status	Advanced success
Started	...
Astrometry.net job	3207241
PixInsight job	AOPMJ4T11I2T9GUI23WY616QO1NFP3DM
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h32m01s.61
RA (top/left)	06h29m21s.32
RA (top/right)	06h28m21s.80
RA (bottom/right)	06h34m41s.48
RA (bottom/left)	06h35m42s.79

Dec (center)	+05°00′24″.9
Dec (top/left)	+06°10′19″.10
Dec (top/right)	+04°01′30″.4
Dec (bottom/right)	+03°50′23″.10
Dec (bottom/left)	+05°59′14″.4

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NGC 2244 - Rosette Nebula in HO

NGC 2244 - Rosette Nebula in HO

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NGC 2244 - Rosette Nebula in HO

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