Tag: Globular Cluster

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Messier 9 (also known NGC 6333) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier in 1764.

M9 is one of the nearer globular clusters to the centre of the Milky Way Galaxy with a distance of around 5,500 light-years. Its distance from Earth is 25,800 light-years. The total luminosity of this cluster is around 120,000 times that of the Sun, the absolute magnitude being -8.04.

The brightest individual stars in M9 are of apparent magnitude 13.5, making them visible in moderately sized telescopes. There have been 13 variable stars found in M9.

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Images by Andy Wilson

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The Great Globular Cluster in Hercules (also known as  M13, or NGC 6205) is a globular cluster in you guessed it the constellation of Hercules.

It was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.

With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night from a dark site, (unlike the Crayford area). Its real diameter is about 145 light-years, and it is composed of several hundred thousand stars, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth.
Its diameter is about 23 arc minutes and it is readily viewable in small telescopes. 

The Arecibo message of 1974 was transmitted toward this globular cluster. The reason was that with a higher star density the chances of a life harbouring planet, with intelligent life forms, were higher.

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Images of M13 by Simon Dawes

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Images of M13 by Brian Thompson

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Images of M13 by Martin Crow

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Images by Neil Webster

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NGC 6539 is a globular cluster in the constellation Serpens. It was discovered by Theodor Brorsen in 1856

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Globular Cluster NGC6539 Imaged by Debra Holton using the Faulks 2m Telescope.

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Two globular clusters very close to each other seen through the dense star field in the direction towards the centre of our Galaxy, in the constellation Sagittarius. These systems are relatively young for globular clusters, being only about 10 million years old.

They can be spotted between gamma1 and W Sagitarii (see finder chart below). NGC6522 (right) sits right in the centre of Baade's Window

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Image by Debra Holton of NGC6522 taken with the 2m Faulkes Telescope.

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