|The planetary nebula NGC 7008 (also known as "Fetus" nebula" or PK 93+5.2) in the constellation Cygnus on October 14 / 15, 2017.
The expanding ionized shell of gas ejected by an old red giant star late in its life was discovered by William Herschel in 1787 and is approximately
2800 light-years from earth. It measures 1 light-year in diameter. (source: Wikipedia).
Twenty-one exposures of approximately 3 minutes at ISO 800 were stacked with no dark frame
subtraction with Deep Sky Stacker (resulting in a 1 h 10 min exposure) and further processed in Photoshop.
|Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector,
16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform,
Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison:
image of the moon with the same equipment).