M75 is a magnitude 8.6 globular star cluster. It is one of fifteen Messier objects in the constellation Sagittarius, and is located about ten degrees northeast of M55 close to the Capricornus border. It is a small globular cluster that is about 6.8 arc-minutes in diameter. It is highly concentrated and compact. William Herschel described it as a miniture M3. Compare M75 to M80, which is also a very compressed globular cluster. M75 was added to the Messier List in 1780, after being discovered by P. Mechain in August of that same year. It is probably the most remote globular cluster in the Messier Catalog at a distance of about 95,000 light-years.
This is an RGB CCD image taken with a Takahashi FCT-150 refractor using an SBIG ST-8XE. This image was taken from my backyard in Scottsdale, Arizona.
M75 (NGC 6864)
Constellation: Sagittarius
RA: 20h 06m 32s Dec: -21d 54' 00"
April 16, 2006
Image by Sid Leach
Scottsdale, Arizona
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