Michael A. Stecker
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.