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Contains:  NGC 2252, NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
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The Rosette Nebula, Caldwell 49, 


            Steven Bellavia
The Rosette Nebula, Caldwell 49

The Rosette Nebula, Caldwell 49

Technical card

Resolution: 4800x3600

Dates:Dec. 20, 2019

Frames:Baader Planetarium UHC-S: 44x240" (gain: 100.00) -15C bin 1x1

Integration: 2.9 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 23.53 days

Avg. Moon phase: 35.48%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 20.00

Mean FWHM: 5.00

Temperature: -5.00 job: 3133314

RA center: 6h 32' 13"

DEC center: +4° 56' 38"

Pixel scale: 1.361 arcsec/pixel

Orientation: 359.242 degrees

Field radius: 1.134

Data source: Backyard


The Rosette Nebula, Caldwell 49, is a large spherical H II region 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 cluster and nebula are 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.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


The Rosette Nebula, Caldwell 49, 


            Steven Bellavia