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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: wiki/ NGC 6939

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 controlled by EQMOD and KStars Ekos/Indi
Guide : Ekos internal guider in dithering mode, QHY5 camera with 200 mm f/3.5 lens
Lens/telescope : Pentax 645 300 mm ED f/4, external focus motor, Pentax 645 project page
Corrector/Barlow : -
Field (FOV) : 6.8x4.5 degree, before cropping
Filter : none
camera : Canon 6D, temperature +8 C. Controlled by KStars Ekos/Indi
Film/CCD : Raw
Exp. time : 60x60 seconds, iso1600
Image process tool : Siril, Gimp, Irfanview
Processing :  cal dark & flat
Weather : clear, temperature +3 C
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
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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