Messier 13 - The Great Cluster in Hercules (urmymuse)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · IC 4614 · IC 4615 · IC 4617 · M 13 · NGC 6196 · NGC 6205 · NGC 6207

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Messier 13 - The Great Cluster in Hercules

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Messier 13 - The Great Cluster in Hercules

Messier 13 or M13, also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of several hundred thousand stars in the constellation of Hercules.

M13 was discovered by Edmond Halley in 1714, and cataloged by Charles Messier on June 1, 1764 into his list of objects not to mistake for comets; Messier's list, including Messier 13, eventually became known as the Messier Catalogue.

M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is a red giant, the variable star V11, with an apparent visual magnitude of 11.95. M13 is about 22,200 light-years away from Earth.

It wasn't until 1779 that the single stars in this globular cluster were resolved. Compared to the stars in the neighbourhood of the Sun, the stars in M13's stellar population are more than a hundred times denser. They are so densely packed together that they sometimes collide and produce new stars. The newly-formed, young stars, so-called "blue stragglers," are particularly interesting to astronomers.

Note - collimation or guiding or spacing not brilliant in this , even though heavily cropped stars round edges not very round - but my best M13 to date

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B

B

Description: Complete redo, have left wider field as managed to smooth background :) Got a lot to learn still but processing has improved in last year lol

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Yorkshire Astro Imaging
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Status	Advanced success
Started	...
Astrometry.net job	3496251
PixInsight job	HFRVTNJFH65AKZZ415FD60JVUD47SL1N
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h41m36s.917
RA (top/left)	16h45m38s.972
RA (top/right)	16h38m09s.179
RA (bottom/right)	16h37m36s.877
RA (bottom/left)	16h45m01s.652

Dec (center)	+36°27′14″.18
Dec (top/left)	+36°50′59″.60
Dec (top/right)	+37°01′47″.14
Dec (bottom/right)	+36°02′53″.13
Dec (bottom/left)	+35°52′13″.46

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Messier 13 - The Great Cluster in Hercules

Messier 13 - The Great Cluster in Hercules

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Messier 13 - The Great Cluster in Hercules

Messier 13 - The Great Cluster in Hercules

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