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Contains:  NGC 2252, NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
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Rosette Caldwell 49 in BiColor HA and Oiii, 


            Vincent Lupo
Rosette Caldwell 49 in BiColor HA and Oiii

Rosette Caldwell 49 in BiColor HA and Oiii

Technical card

Resolution: 2640x2060

Dates:Jan. 15, 2015

Frames: 10x1200"

Integration: 3.3 hours

Avg. Moon age: 24.13 days

Avg. Moon phase: 29.54% job: 503625

RA center: 97.991 degrees

DEC center: 4.956 degrees

Pixel scale: 2.016 arcsec/pixel

Orientation: -176.031 degrees

Field radius: 0.938 degrees


The Rosette Nebula (also known as Caldwell 49) is a large, circular 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 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 5,200 light-years from Earth (although estimates of the distance vary considerably, down to 4,900 light-years.[3]) 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.



Vincent Lupo
License: None (All rights reserved)

Sky plot

Sky plot


Rosette Caldwell 49 in BiColor HA and Oiii, 


            Vincent Lupo