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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, belt modified, low rider
Guide : 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) : 6.8x4.5o (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 bias, flat, photometric color calibration
Weather : Clear sky
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
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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