Hi all,
An image of Messier 27 has been uploaded.This is a very deep (over 100 hours of exposure) image of this planetary nebula and is the result of a joint project with Don Goldman. It was taken with narrowband filters (Halpha, NII and OIII). The inclusion of the NII filter was due to the intensity of this emission in the nebula’s spectrum. You can find some more details and the image at:
Enjoy!
Josep