| Tecnical data | Value |
| Object | M31 |
| Constellation(s) | And |
| Telescope | Schmidt Camera 600/400/300 (Zen optics): focal length 600 mm, f/2 |
| Location | Druogno, Val Vigezzo, province of Verbania, near Lake Maggiore, Italian Alps, 860 m height |
| Tracking | Manual with illuminated reticle eyepiece |
| Filter | |
| Exposure | 45 min |
| Film | Kodak Technical Pan 2415 |
| Development | 15 min |
| Film ipersitized? | no |
| Film iper notes | |
| Date | 25/08/1989 |
| Hour | 22.52 UT |
| Quality | good - |
| Notes | |
| Processing notes | |
| Ambient temperature | 22 °C |
| Scan resolution | 4800 dpi (CanoScan 9950F) |
