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M67 is one of the oldest of the galactic clusters at around 4,000 million years (about the same age as the Sun). In the constellation of Cancer, it contains at least 500 stars, is 2,700 light years away and subtends an angle of 30 arc-minutes. It was first observed by Johann Gottfried Koehler in 1779 but it is thought that his telescope was not good enough to have resolved stars. Chales Messier rediscovered it, recognised that it contained stars and added it to his list on 6 April 1780. | ||
| Date and Time | 17th April 2010 20:42 to 20:56 UT | Camera | Starlight Xpress MX716 | Telescope | ST80 (focal length 400 mm) | Capture | Star_mx7. Exposure 30 sec, 25 frames | Processing | Star_mx7. Black level, enhancement factor 25, black level, on each frame. RegiStax5. 25 frames stacked, histogram 129-255. |
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