NGC7293 Helix Nebula
Scope: Deep Sky Instruments RC10c 254mm @ f/7.4 / FL= 1880mm Corrected Ritchey Chretien
Camera: FLI- ML11002M with FLI (7 position filter wheel CFW-5-7)
Total Exposure: Ha= 4 hr (20min subs x 12) OIII= 3 hr (20min subs x 9)
October 2012: Chico, California, USA
Comments: The Helix Nebula is an example of a planetary nebula formed at the end of a star's evolution. Gases from the star in the surrounding space appear, from our vantage point, as if we are looking down a helix structure. The remnant central stellar core, known as a planetary nebula nucleus or PNN, is destined to become a white dwarf star. The observed glow of the central star is so energetic that it causes the previously expelled gases to brightly fluoresce. The Helix Nebula in the constellation of Aquarius lies about 700 light-years away, spanning 2.5 light-years..