Hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  IC 4628
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Prawn Nebula IC 4628 in SHO, 



    
        

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Prawn Nebula IC 4628 in SHO
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Prawn Nebula IC 4628 in SHO

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Prawn Nebula IC 4628 in SHO, 



    
        

            robonrome
Prawn Nebula IC 4628 in SHO
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Prawn Nebula IC 4628 in SHO

Technical card

Imaging telescopes or lenses: APM LZOS 130/780

Imaging cameras: ZWO ASI294MM Pro

Mounts: iOptron CEM70

Guiding telescopes or lenses: PrimaLuceLab 240mm guide scope

Guiding cameras: zwo asi224 mc

Focal reducers: Teleskop-Service TSFLAT TSFLAT2.5

Software: Photoshop CC  ·  Aries Production astro pixel processor  ·  StarTools 1.7

Filters: Antlia SII 3.5nm  ·  Antlia 3.5nm Ha  ·  Antlia 3.5nm OIII

Accessory: ZWO EAF Focuser  ·  ZWO EFW 36mm  ·  PrimaLuceLab ECCO ECCO  ·  PRIMALUCE LAB Eagle 3s


Dates:April 25, 2021

Frames:
Antlia 3.5nm Ha: 80x300" (6h 40') (gain: 120.00) -5C bin 2x2
Antlia 3.5nm OIII: 78x300" (6h 30') (gain: 120.00) -5C bin 2x2
Antlia SII 3.5nm: 75x300" (6h 15') (gain: 120.00) -5C bin 2x2

Integration: 19h 25'

Darks: ~25

Flats: ~25

Bias: ~50

Avg. Moon age: 12.84 days

Avg. Moon phase: 95.87%

Bortle Dark-Sky Scale: 7.00

Temperature: 15.00


Basic astrometry details

Astrometry.net job: 4461460

RA center: 16h 57' 7"

DEC center: -40° 24' 28"

Pixel scale: 1.228 arcsec/pixel

Orientation: 180.980 degrees

Field radius: 0.825 degrees


Resolution: 3993x2735

Data source: Backyard

Description

Around 19hours of integration taken over 4 nights

For this image I've reverted to just using a straight flatenner (TS Flat) on my APM130 so full 780mm focal length.

While this probably framed the nebula better than the 585mm I'd been using until recently with the riccardi reducer, I did run into more guiding issues resulting in more star bloat and loss of detail that I would have liked. As a result I feel I haven't captured quite the fine detail that I might have... I did cull the poorer subs but may try a re-process on a more drammatic cull down further to perhaps the best 10 hours of data and see if that helps.

For future I will be reverting back to using my 0.75 reducer, at least for a time, where my guding is better and less star bloat (of course tilt management is then a challenge).

Stacked in APP into Ha, OIII and SII stacks and a combined as Luminance I then recombined and processed in Startools with palette using one of that tool's SHO presets.

Final processing in PS using astronomy tools apps and selective colour masking for curves, saturation and sharpening.

Comments

Revisions

  • Prawn Nebula IC 4628 in SHO, 



    
        

            robonrome
    Original
  • Final
    Prawn Nebula IC 4628 in SHO, 



    
        

            robonrome
    D

D

Description: re-stacked and processed culling down to just the best 10hours. sharper and finer stars, but not sure I like the colour and macro detail as much as the original...

Uploaded: ...

Sky plot

Sky plot

Histogram

Prawn Nebula IC 4628 in SHO, 



    
        

            robonrome