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Open Cluster
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| Object : | NGC 6811 |
| Coordinates/Direction : | RA: 19h37m, DEC: +46o23' |
| Object size : | 13' |
| Apparent magnitude : | 6.8 |
| Distance : | 3600 ly |
| No solar mass : | 377 stars |
| Radius : | 14 ly |
| Discovered by : | John Herschel, year 1829 |
| Find in constellation : | Cygnus |
| More to know : |
Wikipedia: https://en.wikipedia.org/ wiki/ NGC 6811 |
NGC 6811, 2019-03-23 + 2019-04-17
(click on the image to get a full resolution photo in a new window) |
| Date : | 2019-03-23 + 2019-04-17 |
| Time (UT) : | - |
| Mount : | SkyWatcher EQ6 Pro, Beltdrive (DIY 2019) |
| Guide : | QHY5 camera with 400 mm f/6.3 lens |
| Lens/telescope : | TS130 APO f/7 910mm, 3" focuser |
| Corrector/Barlow : | 3" field flatter, 1.0x |
| Field (FOV) : | 2.25 x 1.5o (full frame) before crop |
| camera : | Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit |
| camera temperature: | About 6o C above surrounding temperature |
| Film/CCD : | Raw, Cr2 |
| Filter : | none |
| Control system : | Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC |
| Exp. time : | 173x60 seconds, iso1600, dithering mode |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | demosaic, flat, hot pixel removed by dithering, level, crop, size |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | To get more exposure time I have added older data I took 2 weeks ago to get a total of 3 hour exposure time. The above photo is a crop around the center of the open cluster. Click on it and get the full file field high resolution photo. As you see down to the left I was a bit unlucky and got dust or a hair on the sensor. |
NGC 6811, 2019-04-17
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| Date : | 2019-04-17 |
| Time (UT) : | 21:57 to 00:14 |
| Mount : | SkyWatcher EQ6 Pro, Beltdrive (DIY 2019) |
| Guide : | QHY5 camera with 400 mm f/6.3 lens |
| Lens/telescope : | TS130 APO f/7 910mm, 3" focuser |
| Corrector/Barlow : | 3" field flatter, 1.0x |
| Field (FOV) : | 2.25 x 1.5o (full frame) before crop |
| camera : | Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit |
| camera temperature: | About 6o C above surrounding temperature |
| Film/CCD : | Raw, Cr2 |
| Filter : | none |
| Control system : | Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC |
| Exp. time : | 90x60 seconds, iso1600, dithering mode |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | demosaic, flat, hot pixel removed by dithering, level, crop, size |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | A new attempt to catch something different. This is an open cluster that I can reach from our balcony, more to the North. To increase the contrast I need more exposure time to not introduce to much noise. |
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