Above: H-alpha (Ha) channel only (uncalibrated). Click for larger view.
| OBJECT |
NGC 6888 - Crescent Nebula (image above is reduced-size | other sizes: medium , large) Distance: 5,000 light years |
|
| Telescope | TPO 12" Truss-tube RC @ f/6.2 | |
| Mount | Astro-Physics AP1100GTO (on ATS pier) | |
| Camera | QSI 690wsg @ -10C | |
| Filters | Astrodon Ha (3nm), Astrodon Tru-Balance I-Series LRGB Gen 2 | |
| Guider | SX Lodestar | |
| Settings | 3x5min L, 9x10min Ha (bin1x1); 3x5min ea RGB (bin2x2); AstroArt5, PI, CS4 (slightly cropped, 10xdarks/flats/fdarks/bias) | |
| Date/Location Notes |
21 May 2025 - Las Cruces, NM This image is LHaRGB where Lum+Ha was used for Luminance and Ha:R (80:20) was used for the Red channel. |
