Celestial hemisphere:  Southern  ·  Constellation: Aquarius (Aqr)  ·  Contains:  Helix Nebula  ·  NGC 7293
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Helix Nebula in HOO with my new Meade 12in ACF F8, 



    
        

            robonrome
Helix Nebula in HOO with my new Meade 12in ACF F8
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Helix Nebula in HOO with my new Meade 12in ACF F8

Getting plate-solving status, please wait...
Helix Nebula in HOO with my new Meade 12in ACF F8, 



    
        

            robonrome
Helix Nebula in HOO with my new Meade 12in ACF F8
Powered byPixInsight

Helix Nebula in HOO with my new Meade 12in ACF F8

Acquisition details

Dates:
Sept. 2, 2022
Frames:
108×300(9h)
Integration:
9h
Avg. Moon age:
6.07 days
Avg. Moon phase:
36.26%

Basic astrometry details

Astrometry.net job: 6304652

RA center: 22h29m38s.9

DEC center: -20°4958

Pixel scale: 0.788 arcsec/pixel

Orientation: 191.628 degrees

Field radius: 0.255 degrees

Resolution: 1925x1304

File size: 1.4 MB

Locations: Backyard, Brisbane, Queensland, Australia

Data source: Backyard

Description

Haven't posted for a while as I've been trying to get up to speed with my new Meade 12in F8 ACF... this was an upgrade to the 10in i had briefly that suffered from some astigmatism. 

After mid length refractors, Imaging at 2400mm on an SCT is something of a challenge as is getting to grips with mirror shift, large temp shifts, collimation and even basics like focussing at F8 ... have been gradually ticking off the boxes... first getting guiding working (CEM120 carriers it well) and a big step for narrowband here using NINA to calculate focus offsets so I can use LUM filter to focus... saves a lot of time when with Ha it was needing 30s per exposure to focus on the Helix and in any case get's a more accurate focus. Found with this OTA that clockwise turn of the built in focusser pushed the mirror forward and it's best to end on that before collimating to avoid mirror flop when moving about the sky. Actual auto-focus is being done here with an Esatto 2in. 

In the end need to accept that stars aren't going to be as sweetly defined and round everywhere as on a good refractor, but this seems to be less of an issue once processing a good stack especially from either side of meridian.

Takes a long time to get a decent S/N at F8 (no surprise I guess). I've since purchased an 0.67x reducer that works well with this ACF and tweaking to get that right now that will help.

Here I've stacked and basic process in APP and then combined and processed in Startools before combining and tweaking in PS CC.

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Helix Nebula in HOO with my new Meade 12in ACF F8, 



    
        

            robonrome

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Southern Hemisphere Astro