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NGC 7293 is the nearest and biggest planetary nebula, nevertheless is very faint. It's nicknamed Helix because of its helical shape. The progenitor of this nebula is the blu central star, visible in the enlargement here under.
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| Optics | Pentax 75 apochromatic refractor |
| Focal Lenght | 500 mm |
| Focal Ratio | f/6,7 |
| Exposure Time | 25 min |
| Film | Kodak E200 |
| Developement sensibility | 320 ISO |
| Location | Colle del Nivolet (AO, on the Alps, Italy) at 2600m |
| Date and time of exposure start | 5 october 2002, 20.50 UT |
| Mount | Gemini G41 |
| Tracking | ST4 |
| Temperature and humidity | T=-1°C, RH=69% |
| Notes | - |
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