Sadr Region
Pretty dark nebulae in front of hydrogen clouds
The weird extra spike on the brightest star (Sadr) is an artifact either from the secondary mirror holder or the drawtube. It’s under investigation. Let me know if you have any ideas.
Weather was 9°C, relative humidity 94%, wind ~5km/h.
| Telescope | Skywatcher 200PDS (200/1000 Newton) |
| Filter | IDAS D2 (multi-bandpass light pollution filter) |
| Coma corrector | Skywatcher f/5 |
| Camera | Canon 7D Mark II |
| Resolution | 2636 x 1748 (cropped & scaled) |
| Light frames | 26/38, 300s @ ISO 800, 2h20m in total |
| Dark frames | 10 |
| Bias frames | 12 |
| Flat frames | 10 |
| Location | Bolton, UK |
| Local time | 2020-09-13 23:32 - 02:51 (including a meridian flip!) |
Previous version
For this previous version the same data was processed without the calibration frames. Siril did a pretty good job without them!
| Telescope | Skywatcher 200PDS (200/1000 Newton) |
| Filter | IDAS D2 (multi-bandpass light pollution filter) |
| Coma corrector | Skywatcher f/5 |
| Camera | Canon 7D Mark II |
| Resolution | 1500 x 993 (cropped) |
| Light frames | 22/38, 300s @ ISO 800, 1h50m in total |
| Dark frames | - (!) |
| Bias frames | - (!) |
| Flat frames | - (!) |
| Location | Bolton, UK |
| Local time | 2020-09-13 23:32 - 02:51 (including a meridian flip!) |
This picture was also one of our first tries with our new light pollution filter. Here’s the transmission graph:
