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Contains:  NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
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Rosette Nebula - H-alpha, 


            Thomas Richter
Rosette Nebula - H-alpha

Rosette Nebula - H-alpha

Technical card

Resolution: 3358x2536

Dates:Feb. 21, 2018

Frames:Baader Ha 1.25" 7nm: 11x600" -20C bin 1x1

Integration: 1.8 hours

Darks: ~30

Flats: ~21

Bias: ~100

Avg. Moon age: 5.47 days

Avg. Moon phase: 30.22%

Temperature: -4.00 job: 1939636

RA center: 97.977 degrees

DEC center: 4.975 degrees

Pixel scale: 1.103 arcsec/pixel

Orientation: 356.850 degrees

Field radius: 0.645 degrees

Locations: Nürnberg, Nürnberg, Bayern, Germany


Object description (

The Rosette Nebula (also known as Caldwell 49) is a large spherical H II region (circular in appearance) located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter.

The complex has the following NGC designations:

NGC 2237 – Part of the nebulous region (Also used to denote whole nebula)
NGC 2238 – Part of the nebulous region
NGC 2239 – Part of the nebulous region (Discovered by John Herschel)
NGC 2244 – The open cluster within the nebula (Discovered by John Flamsteed in 1690)
NGC 2246 – Part of the nebulous region

The cluster and nebula lie at a distance of some 5,000 light-years from Earth) and measure roughly 130 light years in diameter. The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.



Thomas Richter
License: None (All rights reserved)

Sky plot

Sky plot


Rosette Nebula - H-alpha, 


            Thomas Richter