| 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 | 60 min |
| Film | Kodak Technical Pan 2415 |
| Development | |
| Film ipersitized? | no |
| Film iper notes | |
| Date | 29/09/1989 |
| Hour | 21.12 UT |
| Quality | good + |
| Notes | |
| Processing notes | |
| Ambient temperature | 12 °C |
| Scan resolution | 4800 dpi (CanoScan 9950F) |
