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NGC 891.
Sean Douglas
October 20–27, 2026 · Andromeda
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Download full-resolution JPEG ↓42.56 megapixels · sRGB · 17.8 MB
ABOUT THIS IMAGE
How I made
this image.
I collected this image over eight nights with my ZWO ASI1600MM-Cool. Skotiq handled the capture, calibration, and integration, including a 2× drizzle rebuild.
I finished it in PixInsight, using GraXpert for background correction and RC Astro tools for sharpening, noise reduction, and star separation. The final edit combines LRGB with continuum-subtracted Hα.
The 824 accepted frames total 27 hours and 19 minutes. The drizzle version keeps the same composition at 7600 × 5600 pixels.
Exposure details
| Filter | Frames | Exposure | Total |
|---|---|---|---|
| L | 179 | 90 s | 4 h 28 m 30 s |
| R | 185 | 120 s | 6 h 10 m |
| G | 189 | 120 s | 6 h 18 m |
| B | 190 | 120 s | 6 h 20 m |
| Hα | 81 | 180 s | 4 h 3 m |
- Camera
- ZWO ASI1600MM-Cool
- Mount
- Pegasus NYX-101
- Capture & integration
- Skotiq · 2× drizzle
- Final editing
- PixInsight · GraXpert · RC Astro