M20 - Trifid Nebula
M20 - Trifid Nebula |
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Object Info |
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| Object type: | Nebula | |
| Size: | 20' x 20' | |
| Magnitude: | 6.3 | |
| Constellation: | Sagittarius | |
| Distance: | 6000 Light Years | |
Exposure Info |
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| Date: | 2008-08-01 | |
| Location: | Pleasantville (NY) | |
| Telescope: | Celestron 8 @ F/6.3 | |
| Camera: | SBIG ST8XME | |
| Binning: | Lum: 1x1, RGB 2x2 | |
| Exposure time: | L: 25-min (5x5) R,G: 6-min, B: 10-min | |
| Exposure time total: | 47 Minutes | |
| Processing | CCD Stack, CS2 | |
| Comment | A short exposure and evaluation of using 2x2 bins with exposure time matching the luminance, and accounting for the 1.6 factor for blue.
The F/6.3 reducer creates vignetting that is hard to overcome (flats do not seem to work very well) leading to loss of data (had to raise the black level) |
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