NGC 40

About image
NGC 40 is a planetary nebula visible in the constellation of Cepheus.
Its magnitude is 12.3 and its apparent dimensions are 38 "x35".
Its diameter is around one year light, and contains within it a white dwarf, to which the nebula is due, with a surface temperature of 90 000 K; this star with its strong stellar wind interacts with the nebula, deforming it until it assumes an irregular shape.
Within a few tens of millennia, the nebula will disperse into the interstellar medium, leaving the central dwarf star free, which will also go out slowly in space.
The distance from the Solar System is estimated at around 11,750 light years.

Technical data
Optics         Celestron C9.25 Edge HD f/10
Mount        Losmandy G11 with Ovision worm and FS2
Camera         Atik 4000 with Starlight Xpress filter wheel 5 positions
Filters         Baader Ha 7nm and OIII 8.5nm, 50.8 unmounted
Guiding system    OAG LB Astro Proxima and Lodestar
Exposure details  Ha 31x120" bin1 -15C
                                    OIII 21x120" bin1 -15C
Total integration   1.7h
Acquisition      Maxim, PHD2
Processing      Maxim, Photoshop CS5
SQM-L       18.6    
Location       Home terrace (Rescaldina, Italy)
Date           3 September 2013

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