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Open Cluster
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| Object : | NGC 6939 |
| Coordinates/Direction : | RA: 20h31m, DEC: +60o39' |
| Object size : | 7' |
| Object magnitude : | 7.8 |
| More to know : |
Wikipedia: https://en.wikipedia.org/ wiki/ NGC 6939 |
NGC 6939, 2024-03-18:
(click on the image to get one in full resolution in a new window)
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| Date : | 2024-03-17 |
| Time (UT) : | 23:55 to 01:18 |
| Mount : | SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019) |
| Guide : | QHY5 camera with 400 mm f/6.3 lens |
| Lens/telescope : | Pentax 645 300 mm ED f/4 (medium format lens) |
| Corrector/Barlow : | - |
| Field (FOV) : | 6.8x4.5o (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, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux) |
| Exp. time : | 57x60 seconds, iso1600, dithering mode |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | cal synthetic bias and flat,photometric color cal |
| Weather : | clear, temperature -5o C |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | One more photo of the Open cluster NGC 6039. It's at the distance of 4000 ly and it has more than 500 stars in its cluster. One degree away is the galaxy NGC 6946 , it also has the name Fireworks galaxy. The galaxy is weak with its 10.5 magnitude. There are more interesting objects there to look at: NGC 6939 plate solved. |
NGC 6939, 2023-03-03:
(click on the image to get one in full resolution in a new window)
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| Date : | 2023-03-03 |
| Time (UT) : | 22:24 to 23:44 |
| Mount : | SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019) |
| Guide : | QHY5 camera with 400 mm f/6.3 lens |
| Lens/telescope : | Pentax 645 300 mm ED f/4 (medium format lens) |
| Corrector/Barlow : | - |
| Field (FOV) : | 6.8x4.5o (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, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux) |
| Exp. time : | 60x60 seconds, iso1600, dithering mode |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | cal dark & flat |
| Weather : | clear, temperature +3o C |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | This is a new object to me, it have just come around the corner of the house. It's an open cluster of stars. Stars are easy to take photographs of from the balcony even with high light pollution. It doesn't looks very impressive, but click on the photo above and all details are there. |
NGC 6939, 2023-03-03, crop:
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| Date : | 2023-03-03 |
| Time (UT) : | 22:24 to 23:44 |
| Comment : | Zooming in on the open cluster NGC 6939. That's the object up to right. It was discovered already by William Herschel 1798. It has a magnitude of 7.8 and can't be find without a telescope. When looking closer there is another object at lower left, a weak spiral galaxy, NGC 6946, magnitude 9.6. |
NGC 6939 2020-03-14, crop
(Click on the image and get a full view in a new window)
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| Date : | 2020-03-14 |
| Time (UT) : | 22:16 to 00:02 |
| Mount : | SkyWatcher EQ6 Pro, beltdrive modified (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, x1. T48 connector to camera |
| 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 : | 79x60 seconds = 79 minutes, iso1600, dithering mode |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | synthetic bias, flat, photometric color |
| Weather : | clear, temperature -2o C |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | A beautiful open cluster with the nearby Fire Works galaxy very small apparent galaxy NGC 6946. Compare this photo with the others above taken with 1/3 of the focal lenght. I want to know what more objects there are in its surroundings. NGC 6939 plate solved, credits Astrometry. But only the galaxy and the open cluster can be found. |
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