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NGC 2244 Rosette Nebula - Starless, 


            Douglas J Struble

NGC 2244 Rosette Nebula - Starless

Technical card

Resolution: 2648x2121

Dates:Jan. 7, 2018Jan. 14, 2018Jan. 19, 2018

Astrodon Ha 5nm: 75x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 42x240" (gain: 139.00) -20C bin 1x1
Astrodon SII 3nm: 43x240" (gain: 139.00) -20C bin 1x1

Integration: 10.7 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 16.70 days

Avg. Moon phase: 25.37%

Bortle Dark-Sky Scale: 6.00 job: 2271518

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


This is a starless version of the Rosette Nebula. I am still in search of a good star removal method and have researched many. The ones I have tried still leave a tremendous amount of artifacts, which is really no less time consuming that doing it manually like I did here.

NGC 2244 (also known as Caldwell 50) is an open cluster in the Rosette Nebula, which is located in the constellation Monoceros. This cluster has several O-type stars, super hot stars that generate large amounts of radiation and stellar wind.

The age of this cluster has been estimated to be less than 5 million years. The brightest star in the cluster is 12 Monocerotis, a foreground K-class giant. The two brightest members of the cluster are HD 46223 of spectral class O4V, 400,000 times brighter than the Sun, and approximately 50 times more massive, and HD 46150, whose spectral type is O5V, has a luminosity 450,000 time larger than that of our star, and is up to 60 times more massive, but it may actually be a double star.



Douglas J Struble
License: None (All rights reserved)


NGC 2244 Rosette Nebula - Starless, 


            Douglas J Struble