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Contains:  NGC 2239, NGC 2244, NGC 2252, Rosette nebula, The star 12Mon
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NGC 2244 - Rosette Nebula in HO, 


            Rich Sky
NGC 2244 - Rosette Nebula in HO
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NGC 2244 - Rosette Nebula in HO

Technical card

Dates:Jan. 25, 2020

Frames:Baader Planetarium F/2 Highspeed filter set: 127x180" -20C bin 1x1

Integration: 6.3 hours

Darks: ~30

Flats: ~80

Bias: ~30

Avg. Moon age: 0.57 days

Avg. Moon phase: 0.37%

Bortle Dark-Sky Scale: 8.00

Mean FWHM: 3.80

Temperature: -6.00

Basic astrometry details job: 3207241

RA center: 6h 32' 17"

DEC center: +4° 52' 51"

Pixel scale: 3.938 arcsec/pixel

Orientation: 83.295 degrees

Field radius: 1.549 degrees

Resolution: 2250x1720

Locations: UGG-419 Observatory, Canada, Canada

Data source: Backyard


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.

Clear skies



Rich Sky
License: None (All rights reserved)

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NGC 2244 - Rosette Nebula in HO, 


            Rich Sky