Helix Nebula, NGC 7293
Located in Aquarius, it is the closest known planetary nebula to us (~ 700ly), but is large and of low surface brightness. Radiation emitted by the extremely hot dying star in the centre causes many shells of gas previously blown off by the star to fluoresce producing the observed colours, predominantly of ionised hydrogen and oxygen.
|Camera:||SBIG STL11000M, Astrodon filters||Scope:||Takahashi TOA-130, f=1000mm, f7.7 (cropped fov ~0.6°x0.5°)|
|Mount:||Takahashi EM-200 Temma2||Guiding:||E-finder|
|Filters/Exposures:||L:R:G:B = 2x15:2x15:2x15:2x15min ≡ 2h00m||Location:||ASV's LMDSS Heathcote, Victoria|
|Date:||October 2010||Processing:||CCDStack2, MIRA AL8 and Photoshop CS5 (reprocessed March 2023)|