The Rosette Nebula (also known as Caldwell 49) is an 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 5,000 light-years from Earth^[5] 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.

SHO palette Taken from my Bottle-6 backyard in Melbourne, Australia.

45x300sec Ha
15x300sec Oii
15x300sec Siii

Zwo ASI 533MM Pro 
SKyWatcher Esprit 100ED
SkyWatcher Az-EQ6R
ZWO ASI Air capture and control
Optolong 7nm filters
Pixinsight and the GraXpert Plugin