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Messier 75 is a distant (67,500 ly) and compact globular cluster. This old cluster (about 13 billion years old) contains at least 400,000 stars, most of them located within a small region around the nucleus. Messier 75 is believed to be one of the eight globulars provided by a former dwarf galaxy (known as the Gaia-Enceladus-Sausage).
Additional Information
Object
Name(s): Messier 75. M 75. NGC 6864
Type: Globular Cluster
RA: 20h 06m 04s
Dec: -21º 55’ 14”
Constellation: Sagittarius
Size (arcmin): 7×7 arcmin
Magnitude: +9.2
Distance: 67,500 ly
Image
Date: 2019-08-05 and 06
Location: : iTelescope.net, SSO near Coonabarabran, NSW Australia
Size (arcmin): 32×32 arcmin
Telescope: 20” (51 cm) 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 2020