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NGC6939, in the constellation of Cepheus, subtends 8 arc-minutes and has a visual magnitude of 7.8. It is around 1600 million years old and about 4100 light years away. It contains about 80 stars of which the brightest is 12th magnitude. Date and Time: 11th November 2010 20:40 UT Camera: Starlight Xpress MX716 with Astronomik CLS filter Telescope: ETX125 with 0.33 focal reducer Capture: Star_mx7. 60 sec, 10 frames Processing: Star_mx7. Blank subtraction, enhancement factor 25, black level Registax. 10 frames stacked, histogram 12-240, gamma 1.5. Focus Magic 2, 100 PhotoImpact. Vertical flip, reduction to 84%, contrast and brightness +20 |
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