Cropped for Composition 80% of Full Frame

FSQ106N F5 Takahashi APO + STL11K CCD & 8CFW on Paramount ME
Ha 7nm
3.5 Hrs
Bin: 1 x 1
-20C chip temp, darks and flats
Image scale = 3.5 a/p
Guide Camera: SBIG Internal Guide

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 cluster and nebula lie at a distance of some 5,200 light years from Earth (although estimates of the distance vary considerably) and measure roughly 130 light years in diameter.
The radiation from the young stars excite 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.

Source: http://en.wikipedia.org/wiki/Rosette_Nebula