| Name: | NGC6781 |
| Other names: | |
| Description: | Planetary Nebula |
| Ascension: | 19.18 |
| Declanation: | +06 33 |
| Apparent diameter: | 0.4*1.6 (arc min) |
| Constellation: | Aquila/Arend |
| Magnitude: | 12 |
| Distance: | 2500 light years |
| Equipment: | Meade ETX90 - ICX 424 - f/0.6 (1 focal reducer) |
| Date / Time UTC: | july 2005 |
| Stacked : | 60 of 181 |
| Exposure time: | 30 s |
| Location: | Valle Ferro, Portugal |
| Other info: | This is an almost a perfect bubble of gas cast off by a single star that has died. The bubble continues to expand; it is approximately two light years across now. Its imperfection (from our perspective) is due to photodisassociation (yes... this is a real word) by interstellar UV radiation. Energetic photons from nearby bright stars decompose the gas bubble
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© Job Gehéniau
http://www.jgeheniau.nl/etx90/astronomy2.html