| M15 was
discovered by Jean-Dominique Maraldi in 1746. It is over 33,000 light
years away and spans approximately 175 light years. It is one of the
densest globular clusters known, having undergone what is known as
"core collapse." This is common among older clusters. It
also contains a large number of variable stars. |
| Telescope: |
Orion 10
in. f/4.7 Newtonian; Baader coma corrector |
| Camera: |
Modified Canon T4i (650D);
ISO 1600; Raw capture |
| Mount: |
Losmandy G11 |
| Guiding: |
SSAG on 50mm Lumicon
finder scope |
| Exposures: |
20 @ 3minutes |
| Processing: |
Images
were focused using Live View. They were converted to tiff files in
Canon Digital Photo Professional before being aligned and combined
in ImagesPlus. The composite was slightly cropped and adjusted in
Photoshop. Noise was reduced using Topaz DeNoise. |
| Note: |
Taken from my backyard
observatory in southeastern Minnesota. Temp:50F |
| |
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