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Contains:  Helix nebula, NGC 7293
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NGC 7293 Helix Nebula, 


            Barry Brook
NGC 7293 Helix Nebula

NGC 7293 Helix Nebula

Technical card

Resolution: 805x797

Dates:Oct. 10, 2014Oct. 17, 2014

Astronomik Ha 12nm 1.25'': 46x600" 2C bin 1x1
Astronomik OIII 12nm 1.25": 36x600" bin 1x1
Astronomik SII 12nm 1.25": 50x600" bin 1x1
ZWO optical ZWO RGBL Filters: 120x84" bin 1x1

Integration: 24.8 hours

Darks: ~70

Flats: ~100

Bias: ~500

Avg. Moon age: 20.33 days

Avg. Moon phase: 64.33%

Bortle Dark-Sky Scale: 6.00

Temperature: 4.75 job: 407565

RA center: 337.405 degrees

DEC center: -20.824 degrees

Orientation: -89.998 degrees

Field radius: 0.390 degrees


The Helix (also known as "the Eye of Sauron") is the closest of the bright planetary nebulae to the solar system (about 700 light years distant), and covers an area of sky similar to that of the full moon (it actually spans about 2.5 light years of space). It represents ejecta from a dying star at the centre, with its outer layers having been blown off over the past ten or so millennia.

This image was taken using a 120mm achromat refractor with narrowband filters (Ha, OIII and SII) and RGB stars. A synthetic luminance was created using an exposure based weighting. The camera was an Orion Starshoot G3 monochrome, upscaled via drizzling. Two different colour palettes (Ha:Ha-OIII:OIII and HST) are shown.

Captured throughout Oct 2014. Pre-processed with flats (light box), bad pixel map (based on 70 darks) and bias in Nebulosity. Aligned and Drizzled in DSS. Post-processed in StarTools.



Barry Brook
License: Attribution Creative Commons


  • NGC 7293 Helix Nebula, 


            Barry Brook
  • NGC 7293 Helix Nebula, 


            Barry Brook
  • Final
    NGC 7293 Helix Nebula, 


            Barry Brook

Sky plot

Sky plot


NGC 7293 Helix Nebula, 


            Barry Brook