This is the open cluster within the Rosette Nebula. As you will
see, we do have an image of complete rosette Nebula at another section.
The cluster is some 5,200 light-years from us but this is not fixed in
stone, some indications say they are 4,900 light-years. They are
approx 130 light-years across.
Radiation from the young star cluster flash radiation which excite the
nebula's atoms, so we are able to see the emission nebula.
There are several ngc's for this nebula, they are:
2237 - whole nebula
2238- Part of the nebulous region
2239- Part of the nebulous region
2244- the open cluster
2246- Another part of the nebulous region
Date: 10 Feb 12
Images 40-20sec stacked