NGC 6939 - Open Cluster in Cepheus

NGC 6939 is an open star cluster in the constellation of Cepheus, the king. It was discovered by William Herschel in 1789. It lies approximately 5000 light years away and contains 80-100 stars.

NGC 6946, the Fireworks Galaxy, lies only 50 arcminutes NNW of this cluster.


152mm APM refractor

Camera: Modified Canon 650D; raw capture; ISO 1600
Mount: iOptron CEM 60
Guiding: Orion SSAG Pro on 300mm Vivitar lens

18 @ 5 min.


Images were focused using the camera's live view and a Bahtinov mask. They were converted in Canon Digital Photo Professional and were aligned and combined in ImagesPlus. The final image was adjusted in Photoshop. Topaz Detail and DeNoise were applied.


Taken from my backyard observatory in southeastern Minnesota on 6/20-21/17.

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