NGC 6888 is an emission nebula in Cygnus. It is about 5000 light years distant. It is energized by a Wolf-Rayet (WR 136). These stars emit are evolved massive stars that have lost all of their hydrogen (red in the picture) and are fusing helium and heavier elements. They are very bright since much of their atmosphere has been lost. Additionally, NGC 6888 has a significant amount of Oxygen III emission (the pale green/blue component)
Two Towers Observatory
This is my primary observing site. The roll-off roof observatory is based around a 12″ cylinder of reinforced concrete buried 4ft deep. The mount is currently a Paramount MX+. There are 2 primary telescopes: a 10″ GSO-type RC and an 11″ Celestron RASA. Each has its pros and cons. The 10″ is pretty much diffraction-limited by the sky conditions on Bainbridge Island, It has a focal length of 2000mm at f/8. The RASA has a focal length of 670mm at f/2.2. While this produces some amazing pictures, it does not support a filter wheel so I can use a one-shot color camera or change filters by hand. (via a filter drawer). The other downside to the RASA is the Schmidt corrector plate. In this environment, they tend to due up in the winter. The observatory is used remotely via a wireless link.