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Contains:  Helix nebula, NGC 7293
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Helix Nebula NGC7293, 


            Mark Sandford
Helix Nebula NGC7293

Helix Nebula NGC7293

Technical card

Resolution: 3658x2439

Dates:Oct. 6, 2019Oct. 23, 2019Oct. 25, 2019Oct. 26, 2019

Baader Ha 2" 7nm: 120x240" (gain: 139.00) -10C bin 1x1
Baader O3 2" 7nm: 50x240" (gain: 139.00) -10C bin 1x1

Integration: 11.3 hours

Darks: ~100

Flats: ~100

Flat darks: ~100

Avg. Moon age: 21.63 days

Avg. Moon phase: 25.03%

Bortle Dark-Sky Scale: 4.00 job: 3064939

RA center: 22h 29' 44"

DEC center: -20° 50' 31"

Pixel scale: 1.310 arcsec/pixel

Orientation: 1.079 degrees

Field radius: 0.800

Locations: Home among the gum trees, Brisbane, Queensland, Australia

Data source: Backyard


A few firsts for me with this one:-
1. First narrowband image, using a dedicated Mono camera, the amazing ZWO 1600MM Pro - thanks to jlangston_astro for allowing me to borrow it!
2. First processing of HOO - really enjoyed it! Big milestones: learning to use Masked Stretch and Pixel Math, both of which are a bit tough to get your head around, but well worthwhile.
3. First target using off-axis guiding. A bit of overkill for a small, wide refractor, but excellent training for bigger and narrower scopes in years to come.

All of the above were extremely worthwhile, I definitely feel like I'm growing as an astrophotographer, can't wait to get on to the next projects.



Mark Sandford
License: None (All rights reserved)

Sky plot

Sky plot


Helix Nebula NGC7293, 


            Mark Sandford