The Crescent Nebula & Surroundings
The Crescent Nebula is in the constellation Cygnus the Swan. Here is my Cygnus Area Image Index (Pictures of Objects in the Cygnus Area)
This image of the Crescent Nebula in Cygnus consists of 3.5 hours exposure using the TOA 130 telescope with reducer and QHY8 "color" CCD camera.
This picture used my SBIG ST-8300m monochrome camera, narrowband filters, and my small FSQ-85 telescope (85 mm diameter, f3.86, effective focal length 328mm). Total exposure is 7 hours. Each filtered image is assigned a color, which allows for many different views of an object. This view uses the “Hubble Palette” of colors like many of the images from the Hubble telescope: R= Sulfur, Blue = Oxygen, and Green = Hydrogen Alpha. The Crescent itself is a good O3 target. Image acquired on the Fall 2013 Davis Mountains trip.
The Crescent Nebula is a very interesting object and this APOD page has some good info on what we're actually looking at. My image agove shows quite a bit more detail than my older film image cropped from a much shorter focal length shot. I'm not entirely happy with the color of the dimmer stars on this one. I'm in the process of blending the data behind this older image with some new exposure as of late 2013; watch this space.
21 x 5 = 105 minute exposure from the Davis Mountains, October 2008. Takahashi TOA 130 Telescope (a 5" APO refractor) with flattener, AP 900GTO mount, and QHY8 CCD Camera & normal workflow.
Older Film Image: Crescent Nebula Image, NGC 6888, Cygnus
Some other excellent work on this object is here.
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