NGC 6940 in the constellation Vulpecula

NGC 6940 is a beautiful rich-field open cluster.  The cluster itself is comprised of about 70 stars, superimposed on a background of thousands of Milky Way stars.  The cluster is located at a distance of approximatiely 2,500 light-years from Earth.

Image Details:

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    • Instrument: Planewave Instruments CDK 12.5 @ f/8 (2544mm focal length)
    • Mount: Astro-Physics AP1600-GTOCP3
      Image Scale:  1.79 arc-seconds/pixel after processing
    • Camera: SBIG STL-11000M CCD camera with AO-L Adaptive Optics
    • Filters:  Astrodon I-Series LRGB using integrated STL filter carousel
      Exposure: Luminance: 4 x 10 minutes binned 1 x 1
                        Red:  2 x 10 minutes binned 2 x 2
    •                   Green: 2 x 10 minutes binned 2 x 2
    •                   Blue:  2 x 10 minutes binned 2 x 2
    •                   Total equivalent unbinned exposure time of 2 hours 40 minutes

      Capture Software: Maxim DL/CCD
      Processing Software:  CCDStack, Adobe Photoshop CS2

      Location:  CAAS East Observatory, Little Rock, AR., USA, el. 650 ft
      Capture Dates: September 14th, 2012

Wade Van Arsdale
Little Rock, AR., USA
September 30th,  2013