NGC 7000 or North America nebula
Posted by HrAstro
Equipment and other photo info:
Picture taken on August 25th, 2009.
Location: Petrova gora, Croatia, Europe
Skywatcher ED80 + WO II 0,8x, Modified Canon EOS 300D 15x480sec @ ISO1600 for hAlpha, Canon EOS 400D 16x240sec @ ISO800
Guiding with Maksutov 90/1250 + QHY5 guiding camera (PHD Guiding)
Mount: EQ6 Vis upgreded to EQ6 SynScan
Processing software: DeepSkyStacker, PixInsight 1.0, Photoshop CS2
The North America Nebula is large, covering an area of more than four times the size of the full moon, but its surface brightness is low so normally it cannot be seen with the unaided eye. Binoculars and telescopes with large fields of view (approximately 3�) will show it as a foggy patch of light under sufficiently dark skies. However, using a UHC filter which filters out some unwanted wavelengths of light, it can be seen by the naked eye under dark skies. Its prominent shape and especially its reddish color (from the hydrogen Hα emission line) only show up in photographs of the area.
More information about this object at: http://en.wikipedia.org/wiki/North_America_Nebula