AstroPhotography by Dan Richey

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M 10
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M 10

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Messier 10 or M10 (also designated NGC 6254) is a globular cluster of stars in the equatorial constellation of Ophiuchus. The object was discovered by the French astronomer Charles Messier on May 29, 1764, who cataloged it as number 10 in his catalogue and described it as a "nebula without stars". In 1774, German astronomer Johann Elert Bode likewise called it a "nebulous patch without stars; very pale". Using larger instrumentation, German-born astronomer William Herschel was able to resolve the cluster into its individual members. He described it as a "beautiful cluster of extremely compressed stars". William Parsons, 3rd Earl of Rosse thought he could distinguish a dark lane through part of the cluster. The first to estimate the distance to the cluster was Harlow Shapley, although his derivation of 33,000 light years was much further than the modern value.

Object Information

Name M 10
Type Globular Clusters
Constellation Ophiuchus
Catalogue NGC 6254

Acquisition / Processing

Exposure LRGB acquisition in MaximDL
L - 240 sec x 12
R - 240 sec x 6
G - 240 sec x 6
B - 240 sec x 6
Total 2.0 Hours
Telescope AP 160 EDF - FF @ f7.7
Camera SBIG STT-8300
Camera Temp -38ÂșC
Guiding SIG STT-83 Internal
Mount AP 1100 GTO
Filters Astrodon Ha (3nm)
Processing PixInsight
Adobe PhotoShop / LightRoom
Location San Pedro Creek
Date June 4, 2018

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