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NGC 7662 is a small planetary nebula in
Andromeda, of 17" of diameter. Its surname is blue snowball for its shape
and color. In the zoom inset there is the same image of the center
(used as luminance) coupled to the colours imaged in RGB by my friend Massimo
Cenedese. For comparison in the upper inset an image from the Hubble Space
Telescope, which colours are not realistic.
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| Optics | 20cm Meade Schmidt-Cassegrain Telescope |
| Focal Lenght | 2000 mm |
| Focal Ratio | f/10 |
| Exposure Time | 30 minutes (3x10m) |
| CCD | HiSIS23 |
| Sensor | Kaf-401e grade 2 |
| Filters | - |
| Chip temperature | -20°C |
| Location | Tradate (VA, in Pianura Padana, Italy) at 300m |
| Date and time of exposure start | 15 september 2002, 22.40 UT |
| Mount | Gemini G41 |
| Tracking | ST4 |
| Temperature and humidity | T=+15°C, RH=67% |
| Notes | Author of the RGB colours
used in the L-RGB inset is Massimo Cenedese.
Average seeing. |
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