Astrophotography from Australia
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NGC7293 - Helix Nebula
Discovered by Karl Ludwig Harding before 1824.
The Helix Nebula is one of the closest of all planetary nebulae: Lying at a distance of perhaps 450 light years, it is the only planetary nebula for which a parallax could be obtained by ground-based observations.
It is also one of the apparently largest planetaries known: Its apparent size covers an area of 16 arc minutes diameter, more than half of that of the full moon; it's halo extends even further to 28 arc minutes or almost the moon's apparent diameter. Alhough the nebula is quite bright, its light is spread over this large area so that it is not an easy object for visual observing; the Herschels have apparently never cataloged or observed it.
The popular name Helix Nebula refers to the nebula's appearance on photographs.
(Text taken from www.seds.org)
12.5" Ritchey Chretien by RC Optical Systems with RCOS FFC
Hubble SHO Pallette: L(Ha)SIIHAOIII - 7:25:7:7 Hours with RGB stars