Michael A. Stecker
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NGC 6791
NGC 6791 is an open cluster in Lyra. It is one of the oldest (second or third to Berkeley-17) known open clusters at an estimated age of 9.5 billion years. It is, however, much more impressive photographically than the other ancient clusters. It has a very high concentration of golden stars similar to a loose globular cluster.
Photographic Data: An Astrophysics 155-mm f/7 EDF
refractor and 35 mm
camera were used with hypersensitized Kodak Pro 400 PPF film. A single 45-minute exposure was made while centering at RA 19 hrs, 21 min and Declination +37.8 degrees. The cluster size is 15' in diameter. The image was processed in the computer. |