North America and Pelican Nebulae
The North America Nebula is a huge emission nebula in Cygnus close to the bright star Deneb.
It took me years to see it through a telescope, even from dark skies. At 4 times the size of the full moon, i was staring right at the middle of it with my long focal length telescope. Finally i used a filter in the small low power finder scope on top and caught it.
This image is a two frame mosaic with my shortest focal length telescope, showing the North American nebula to the left, and the pelican nebula to the right of a central patch of dust.
This image uses the "hubble pallet" with high energy oxygen as blue, low energy sulfur as red, and hydrogen as green.
not entirely happy with the framing as i've clipped the west coast in order to include the pelican :(
might try again next year
Here it is with an alternative pallet using only high energy oxygen as blue and low energy sulfur as red (hydrogen was used in part as luminance):
Here's an older close up of the "cygnus wall" aka "gulf of mexico"
and the Pelican
Takahashi FS60c @255mm CS 8.6nm Ha, AD 3nm OIII, AD 3nm SII, SX H9
2 frame mosaic total time Ha 49x5 min, OIII 74x10 min, SII 92x10 min
Newport Beach, CA 10/2014