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Getting plate-solving status, please wait...
Helix Nebula Revisited - #1, 



    
        

            Gary JONES
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Helix Nebula Revisited - #1

Getting plate-solving status, please wait...
Helix Nebula Revisited - #1, 



    
        

            Gary JONES
Powered byPixInsight

Helix Nebula Revisited - #1

Acquisition details

Dates:
Sept. 11, 2021
Frames:
50×180(2h 30′)
Integration:
2h 30′
Avg. Moon age:
4.83 days
Avg. Moon phase:
24.13%

RA center: 22h29m38s.93

DEC center: -20°5011.7

Pixel scale: 3.397 arcsec/pixel

Orientation: 92.558 degrees

Field radius: 1.276 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 2250x1500

File size: 2.6 MB

Locations: Home, Sydney, New South Wales, Australia

Data source: Backyard

Description

This is a new image of the Helix Nebula, created using a set of subs originally captured on 11 September 2021. I've included it here as a new image rather than a revision, because it is a different interpretation of the nebula.

The original 60 subs were stacked using SiriL, after eliminating subs with satellite streaks or with FWHM > 4.4. The stack was then processed using StarTools*.

The processed stack was then cropped using Affinity Photo, with some very subtle changes to brightness and contrast to soften the background.

Most importantly, none of the colours in this image were manually altered - so this image reflects a more natural red for Ha, and a nice cyan/teal for OIII.

I'm still not 100% happy with the dynamic range of the background or the stars, so I plan to image the Helix again next month, this time using a mono camera and LRGB/SOH filters.

*  A huge 'thank you' to Ivo from StarTools for his help in getting me started with his amazing software.

Comments

Revisions

  • Helix Nebula Revisited - #1, 



    
        

            Gary JONES
    Original
  • Final
    Helix Nebula Revisited - #1, 



    
        

            Gary JONES
    G

G

Description: This revision softens the background stars and enhances their natural colour, and lifts the background very slightly above 'pure' black.

I was pleased to resolve some of the subtle detail of the Helix, including the outer halo, which is just visible on the upper/right side of the nebula.

I think this is the best that can be done with this data set - but I hope to revisit this subject - one of my favourites - again next month.

Uploaded: ...

Sky plot

Sky plot

Histogram

Helix Nebula Revisited - #1, 



    
        

            Gary JONES