M15 Globular Star Cluster
| Description |
Messier 15, or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster), is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier’s catalogue of comet-like objects in 1764. At an estimated 12.5±1.3 billion years old, it is one of the oldest known globular clusters. |
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| Data/Processing Attribution |
This is my data and processing. |
| Distances/Size |
Apparent size in the sky is 18 minutes—distance to the object: 36,000 light-years. |
| Equipment |
Mount-PlaneWave L-350; Scope-PlaneWave CDK14″, 356 mm aperture, 2563 mm focal length; Camera-Moravian C3-61000, 0.30 arcsec/pixel. |
| Observatory |
The image was captured at the Prairie Skies Astro remote observatory. |
| Exposure |
The total exposure using RGB filters is 2 hours and 21 minutes, with each sub-exposure lasting 90 seconds. RGB Filters R- 36X90= 54 minutes G-36X90= 54 minutes B-22X90= 33 minutes Processing is done in PixInsight, Photoshop, and Lightroom Classic |