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Contains:  NGC 2252, NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
Getting plate-solving status, please wait...
The Rosette in Narrowband, 


            Don Walters
The Rosette in Narrowband

The Rosette in Narrowband

Technical card

Resolution: 4384x3268

Dates:Jan. 22, 2018Jan. 23, 2018Jan. 24, 2018

Astrodon 3nm Ha: 30x300" (gain: 139.00)
Astrodon 3nm OIII: 50x300" (gain: 139.00)
Astrodon 3nm SII: 48x300" (gain: 139.00)

Integration: 10.7 hours

Avg. Moon age: 5.97 days

Avg. Moon phase: 35.36% job: 1937231

RA center: 98.008 degrees

DEC center: 4.977 degrees

Pixel scale: 1.631 arcsec/pixel

Orientation: 89.381 degrees

Field radius: 1.239 degrees

Locations: My Backyard, Benton, AR, United States

Data source: Backyard


First light with my new ASI1600MM-Cool. Nice being able to get bigger targets! Since this was just a warm-up image, I just went with Unity gain at 5-min subs.

PI Processing is as follows:

Calibrated my Flats with Flat-Darks (no bias).
Calibrated my lights against a master dark and master flats (no bias).
(Integrated everything with Winsoried clipping)
Drizzle up by 2x
Cropped slightly
Resample down by 1/2.
DBE to each master (Ha/OIII/SII)
MLT (noise reduction) to each master
Linear fit using OIII (applied to Ha and SII)
Combined using Pixelmath (OHS)
Histogram transformation
Unsharp mask (with star mask in place)
Curves Transform to de-saturate the stars a little



Don Walters
License: None (All rights reserved)


  • The Rosette in Narrowband, 


            Don Walters
  • Final
    The Rosette in Narrowband, 


            Don Walters
  • The Rosette in Narrowband, 


            Don Walters


OHS palette. Clipped the black levels.


Reprocessed to RGB color scheme. HT, ACDNR, HT again, UnsharpMask, HDRMT, ExpTrans.

Sky plot

Sky plot


The Rosette in Narrowband, 


            Don Walters