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Messier 55, also known as M55 or NGC 6809, is a rather bright globular cluster in the constellation Sagittarius. This cluster is also known as the “Summer Rose star”. There is a good explanation about this cluster at the Messier-Objects page.
This image was taken in LRGB and is part of the project to have all messier objects taken with High Resolution telescopes.
Name(s): Messier 55. M55. NGC 6809
Type: Globular Cluster
RA: 19h 39m 59.7s
Dec: -30º 57’ 49.5”
Size (arcmin): 19 arcmin
Distance: 17,600 ly
Location: iTelescope.net, SSO near Coonabarabran, NSW Australia
Size (arcmin): 35×35 arcmin
Telescope: 20” f/6.8 Reflector
Camera: SBIG STX16803 (4096x4096pix)
Guiding: Astrodon MonsterMOAG off-axis guider
Total exposure: 5 hours (L: 1h40m; RGB: 3h20m)
Processing: CCDStack, Photoshop CC 2019