Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  41 the01 Ori  ·  42 c Ori  ·  43 the02 Ori  ·  44 iot Ori  ·  45 Ori  ·  De Mairan's nebula  ·  Great Orion Nebula  ·  Hatysa  ·  LBN 974  ·  LBN 977  ·  LDN 1640  ·  Lower Sword  ·  M 42  ·  M 43  ·  Mairan's Nebula  ·  NGC 1973  ·  NGC 1975  ·  NGC 1976  ·  NGC 1977  ·  NGC 1980  ·  NGC 1981  ·  NGC 1982  ·  Orion Nebula  ·  Sh2-279  ·  Sh2-281  ·  The star 42Ori  ·  The star 45Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri  ·  And 2 more.
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Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski
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Orion Nebula - but ruined by telescope reflections!

Revision title: G2V values + HDR recombine

Getting plate-solving status, please wait...
Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski
Powered byPixInsight

Orion Nebula - but ruined by telescope reflections!

Revision title: G2V values + HDR recombine

Imaging Telescopes Or Lenses
Celestron AstroMaster 114EQ (modified)
Imaging Cameras
ZWO ASI 1600MM-Pro (Mono) ASI 1600MM-Pro (Mono)
Mounts
Skywatcher EQ5 GoTo
Filters
Orion SkyGlow Astrophotography Filter · ZWO Optical ZWO Blue · ZWO Green · ZWO Red
Accessories
Astroberry on Raspberry PI 4
Software
Startools 1.7 · Linux EKOS/Kstars · DSS · GIMP
Guiding Telescopes Or Lenses
Home made 50mm f/5 PVC refractor
Guiding Cameras
ZWO ASI120MM

Acquisition details

Dates:
Nov. 26, 2021 ·  Nov. 27, 2021
Frames:
Orion SkyGlow Astrophotography Filter: 27x240" (1h 48') (gain: 0.00) -10°C bin 1x1
Orion SkyGlow Astrophotography Filter: 38x30" (19') (gain: 0.00) -10°C bin 1x1
ZWO Green: 15x150" (37' 30") (gain: 0.00)
ZWO Green: 20x19" (6' 20") (gain: 0.00)
ZWO Optical ZWO Blue: 20x23" (7' 40")
ZWO Optical ZWO Blue: 16x180" (48') (gain: 0.00)
ZWO Red: 20x30" (10')
ZWO Red: 15x240" (1h) (gain: 0.00)
Integration:
4h 56' 30"
Avg. Moon age:
21.66 days
Avg. Moon phase:
55.19%
Bortle Dark-Sky Scale:
5.00

RA center: 05h35m20s.33

DEC center: -05°1846.5

Pixel scale: 3.490 arcsec/pixel

Orientation: -149.003 degrees

Field radius: 1.278 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 2128x1560

Locations: New Home, Los Alamos, NM, United States

Data source: Backyard

Description

The Orion Nebula is one of the most popular images out there.  It's super bright, easy to find, very colorful and fun.  Everyone knows it so well, it should be SUPER OBVIOUS there's problems in this image.  The circular arcs on the image are reflections within my telescope that are reaching the sensor and, basically, royally messing it up!  There are plenty of stars in the vicinity that are candidates of the source.  I eliminated stray street-lights and the like while imaging, so this is definitely sourced by a star.

So why post it?  Well, my image gallery is full of examples where I've improved from an earlier attempt.  I'm posting it in that vein.  It's also up to help indicate to people what serious problems look like.  Everyone posts beautiful, perfect images, it's not always easy finding clear examples of problems that might help someone else trouble-shoot a setup or process.  Well, here's one of those.

I'm also posting it because this is my first HDR combination image.  Two different sets of data are used in an attempt to avoid blowing out the core of the nebula.  I have one set of data based around 30s subframes and another with 240s subframes.  The fully processed images are blended in GIMP, but only a *very small* amount of blending is done.  I hope you can't notice.  It's been a learning process for me.

Coma is still obvious.  All I want for Christmas is the supply chain to get sorted so I can get a new OTA and coma corrector!

Comments

Revisions

  • Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski
    Original
  • Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski
    B
  • Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski
    C
  • Final
    Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski
    D

B

Title: Now with less jpeg compression!

Description: This is a PNG upload. I noticed too late that the jpeg quality was seriously lacking in the core.

Uploaded: ...

C

Title: Zero RGB bias reductions - Trust the G2V!

Description: This image is redone from the 240s data. I spent more time studying the StarTools module instructions and ended up pushing the data a bit harder. Too much? Main thing was to see what it really looks like without changing the RGB biases and trusting in the G2V calibration I had done. It still required a "Cap Green = 100%", but that's it.

Uploaded: ...

D

Title: G2V values + HDR recombine

Description: The last version was a quick experiment with the color arrangement. I've added back in the 30s image to bring out the core and a couple of the brighter star cores.

Uploaded: ...

Sky plot

Sky plot

Histogram

Orion Nebula - but ruined by telescope reflections!, 



    
        

            Mike Jaworski

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