M13 Hercules Grand Globular Star Cluster
| Description | Messier 13, also known as M13 and sometimes referred to as the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster, is a globular cluster containing several hundred thousand stars in the constellation Hercules. It was discovered by Edmond Halley in 1714 and cataloged by Charles Messier on June 1, 1764, as part of his list of objects not to be mistaken for comets. This list eventually became known as the Messier catalog. Astronomers often describe Messier 13 as the most magnificent globular cluster visible to observers in the northern hemisphere. |
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| Data/Processing Attribution | This is my data and processing |
| Distances/Size | Distance to the object—22,000 22,000 light years; angular size in the sky is about 23′ (minutes). |
| Equipment | Mount-PlaneWave L-350; Scope-PlaneWave CDK14′, 356 mm aperture, 2563 mm focal length; Camera-Moravian C3-61000. |
| Observatory | Prairies Skies Astro Observatories, Mexia, TX, USA |
| Exposure | LRGB filters, total exposure—10 hours 05 min. |