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Open Cluster
NGC 6939


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:

Open cluster NGC 6939, 2024 Sweden (click on the image to get one in full resolution in a new window)
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 -5 C
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-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:

Open cluster NGC 6939, 2023 Sweden (click on the image to get one in full resolution in a new window)
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 +3 C
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-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:

Open cluster NGC 6939, 2023 Sweden
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.
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