Planetary Nebula NGC 7662 "blue snowball"

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.

Technical Data
Optics 20cm Meade Schmidt-Cassegrain Telescope
Focal Lenght 2000 mm
Focal Ratio f/10
Exposure Time 30 minutes (3x10m)
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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