M71 Globular Star Cluster
| Description |
Messier 71 (also known as M71, NGC 6838, or the Angelfish Cluster) is a globular cluster in the small northern constellation Sagitta. It was discovered by Philippe Loys de Chéseaux in 1745 and included in Charles Messier’s catalog of non-comet-like objects in 1780. It was also noted by Koehler at Dresden around 1775. Messier 71 is also known as NGC 6839, though this identification is very uncertain. |
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| Data/Processing Attribution |
This is my data and processing. |
| Distances/Size |
Distance to the object: 13,000 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 7 hours, 7 minutes, and 30 seconds, with each sub-exposure lasting 90 seconds.
RGB Filters for stars R- 100X90sec = 2 hours 30 minutes G-100X90sec = 2 hours 30 minutes B-85X90sec = 2 hours 7 minutes 30 sec Total: 7 hours 7 minutes 30 sec Processing is done in PixInsight, Photoshop, and Lightroom Classic |