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Open Cluster
Messier 37

Object : M 37
Coordinates/Direction : RA: 05h52m, DEC: +32o33'
Object size : 24'
Object magnitude : 6.2
More to know : Wikipedia: wiki/ Messier 37

M37, 2023-10-07

Open cluster M37, Pentax 645 300 mm ED f/4, 2023 (click on the image to get a full resolution photo in a new window)
Date : 2023-10-07
Time (UT) : 21:48 - 23:12
Mount : SkyWatcher HEQ5 controlled by Astroberry
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 (medium format lens)
Corrector/Barlow : -
Field (FOV) : 6.8x4.5 degree, before cropping
Filter : none
camera : Canon 6D, controlled by Astroberry software
Film/CCD : Raw
Exp. time : 60x60 seconds, iso1600
Image process tool : Siril, Gimp, Irfanview
Processing :  cal bias, flat, photometric color calibration
Weather : Clear sky
Site : Sweden, Stockholm, Hagsätra, Bortle class 9
Comment : The open cluster M37 with Milky way in the background. Discovered 1654 by an Italian astronomer. About the angle size of the Moon, 0.5 degree, and at a distance of 4500 ly. Of its 500 stars at least ten are red giants. Upper right is another open cluster, M36. Other objects that surround the cluster can be seen here: M37 plate solved with Astrometry. Opens in a new window.
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