NGC 6888 - The Crescent Nebula
That is NGC 6888 aka the "Crescent Nebula" in the cygnus-area.
The nebula is ejected by the bright star in its middle. That star belongs to the class of so-called Wolf-Rayet-Stars that eject their outer atmosphere, leaving only the stars core, that will eventually turn into a supernova in a few million years. You can see the red, dusty shockwave-front of this event, that compresses the dust that covers the whole cygnus-area but you also can see a second greenish white layer of oxygen from the stars atmosphere, of which I am especially proud, because this is harder to capture with a DSLR-Camera.
The nebula lies 5000 lightyears away towards the Milky Way, which is the reason for all those stars in the photo.
I first took 82 exposures of 5 minutes each in three nights (24th to 26th of May) from midnight till dawn at about 3:15. Before and after that the sun was not low enough below the horizon. The seeing (the Quality of the atmospherical conditions) on the second and third night was exceptionally good. In Mid-August 2012 I added two more nights of imaging for this object. So this is a the result total of a total of 150 images - more than 12 1/2 hours.
|Exposure:||150 x 300s, ISO800|
|Camera:||Canon EOS 1100D, modified + CLS CCD Clipfilter|
|Telescope:||10" GSO RC, 2000mm|
|Guiding:||OAG with Lodestar and PHD|
|EIP:||Fitswork und Gimp|
|Date:||24. - 26.05.2012, 12. - 13.08.2012|